From Michael.Tuexen@lurchi.franken.de Mon Apr 1 02:38:37 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 04AA221F88D6 for ; Mon, 1 Apr 2013 02:38:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Rn6Oyp7JAdf6 for ; Mon, 1 Apr 2013 02:38:36 -0700 (PDT) Received: from mail-n.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) by ietfa.amsl.com (Postfix) with ESMTP id DB3F121F8700 for ; Mon, 1 Apr 2013 02:38:30 -0700 (PDT) Received: from [192.168.1.102] (p5481843E.dip0.t-ipconnect.de [84.129.132.62]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTP id 7FB921C0C069B; Mon, 1 Apr 2013 11:38:27 +0200 (CEST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=windows-1252 From: Michael Tuexen In-Reply-To: Date: Mon, 1 Apr 2013 11:38:29 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: <5158F0FC.3070104@jesup.org> To: piranna@gmail.com X-Mailer: Apple Mail (2.1283) Cc: Randell Jesup , "rtcweb@ietf.org" , "public-webrtc@w3.org" Subject: Re: [rtcweb] DataChannels API and external negotiation X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 01 Apr 2013 09:38:37 -0000 On Apr 1, 2013, at 10:15 AM, piranna@gmail.com wrote: >> /* If either maxRetransmitTime or maxRetransmitNum are set, it's >> unreliable, else it's a reliable channel. If both are set it's an >> error. >=20 > I don't think so (except if it's a limitation of SCTP that I didn't > know, so this message is useless). I think it would make sense to be > able to set both maxRetransmitTime and maxRetransmitNum at the same > time, only that since they are maximus limits it would be effective > the first to be reached. SCTP allows setting a single PR-SCTP policy packet. Supported ones are limiting the number of retransmissions and time to live. Not a = combination of both. That is why you are only providing a single PR-SCTP value. If you want to limit both, you need to define a new PR-SCTP policy. That policy would also require two parameters (the number of retransmissions = and the time to live in ms) as parameters, not only one as we have = currently. So without defining a new PR-SCTP policy, the above text is correct. Best regards Michael >=20 >=20 >=20 > -- > "Si quieres viajar alrededor del mundo y ser invitado a hablar en un > monton de sitios diferentes, simplemente escribe un sistema operativo > Unix." > =96 Linus Tordvals, creador del sistema operativo Linux >=20 >=20 From john@jlc.net Mon Apr 1 07:36:04 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DA1FF11E80C5 for ; Mon, 1 Apr 2013 07:36:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -103.999 X-Spam-Level: X-Spam-Status: No, score=-103.999 tagged_above=-999 required=5 tests=[BAYES_50=0.001, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OGNKSu-Q+tDe for ; Mon, 1 Apr 2013 07:36:03 -0700 (PDT) Received: from mailhost.jlc.net (mailhost.jlc.net [199.201.159.4]) by ietfa.amsl.com (Postfix) with ESMTP id 3E30111E80BF for ; Mon, 1 Apr 2013 07:36:03 -0700 (PDT) Received: by mailhost.jlc.net (Postfix, from userid 104) id 22C3133C23; Mon, 1 Apr 2013 10:36:03 -0400 (EDT) Date: Mon, 1 Apr 2013 10:36:03 -0400 From: John Leslie To: Leon Geyser Message-ID: <20130401143603.GF12940@verdi> References: <51562335.1020409@acm.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.1i Cc: rtcweb@ietf.org Subject: [rtcweb] MTI video codec X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 01 Apr 2013 14:36:05 -0000 Leon Geyser wrote: > > Does anyone know the IPR status of H.261? Of course not! > On the ITU website it lists some patents registered 11 years after the > other patents: http://www.itu.int/ipr/IPRSearch.aspx?iprtype=PS I did follow up on that: there are a bunch of Robert Bosch GmbH patents and one Polycom patent. The Polycom one is easy to find: it was issued December of 1988. The Bosch ones are a little too hard for me to follow, but they appear to have been issued years earlier. But none of those really matter. While there might be interoperable implementations of H.261 that run afoul of some patent issued after the publication of H.261, that would really be accidental. All one needs to do is find an old enough implementation of H.261 and be sure to add nothing the least bit clever in transliterating the code. (If it is C code, that's already done.) > Here are some of my opinions: > - If Google resolves the IPR issues around VP8 then VP8 should be MTI. (No > negotiation failure) > - If it can't be resolved and H.261 can be freely implemented then H.261 > should be MTI. (Browsers will still implement H.264 or VP8) > - If H.261 also has IPR issues then no codec should be MTI. (Browsers will > still implement H.264 or VP8, but there will be negotiation failures. Audio > only.) > - If H.264 is MTI then not all new browsers will be willing to implement > WebRTC. Only the popular browsers will use WebRTC. So much for an open > web...Also other programs interfacing with WebRTC would need licensing for > H.264. I agree, subject to "some" wordsmithing. 1) If Google resolves the IPR issues around VP8 to the satisfaction of the browser distributors more comfortable with H.261, VP8 should be MTI. 2) If H.261 licensors resolve the IPR issues around H.261 to the satisfaction of the browser distributors more comfortable with VP8, H.261 should be MTI. (There's nothing wrong with both being MTI.) 3) If neither 1) nor 2) are satisfied. H.261 should be MTI. There is no question it's _possible_ to safely implement H.261. It's not very good, but it's a starting point. (Anything we specify _will_ be a starting point! It just would be nice to find a better one...) I can easily imagine either (or both) 1) and 2) being satisfied; but I'd have to pinch myself to be sure I wasn't dreaming! We're never going to reach consensus by exchanging messages from two camps both saying, "Be reasonable! Do it my way." Both camps have good reason to prefer their choice. Unless at least one camp can specify what it would take to be satisfied with the IPR status of the other camp's choice -- and we can see a path to getting that in reasonable time -- I suggest we seriously consider the fallback to H.261. -- John Leslie From piranna@gmail.com Mon Apr 1 01:16:20 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 00F4E21F8564 for ; Mon, 1 Apr 2013 01:16:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.599 X-Spam-Level: X-Spam-Status: No, score=-3.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6WsDNft9RzCN for ; Mon, 1 Apr 2013 01:16:19 -0700 (PDT) Received: from mail-wg0-f51.google.com (mail-wg0-f51.google.com [74.125.82.51]) by ietfa.amsl.com (Postfix) with ESMTP id E285321F85A2 for ; Mon, 1 Apr 2013 01:16:18 -0700 (PDT) Received: by mail-wg0-f51.google.com with SMTP id b12so1917211wgh.30 for ; Mon, 01 Apr 2013 01:16:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:content-transfer-encoding; bh=zfApoKPZyWaXo+272fRmiFQW5J+aWIUtwg8441Gzhq0=; b=fa9XnAt0YFsUZXiPG69vSjuCjGGW+nU56gRwjq6wiNiQtaSWGgvXt9fIZ+t0UjlJ/X QMeCC1ajxI+OPA81gayBq0iVk79vXbLmMqAY1ACBg0wHP6Blf+cL3Xca5og8RUYvs+G6 bdWVmg+qFFdQf7OPgEqC7w7rZBE279LTjBu1nlWU6c6DYZ0KOF8AaWG7pwh12qNrZITB FSAACKGW8J8tjPdYKHCoq2uAXubKcP/4Ep5UyV3DCgpmga/kNBUIgy5Iaew0XpvRrak0 i0aj8lbYW9jD6jA9unDGfIucwdMWC+ZKM6Bty42+o9bCgzTJ+bd07NbScruTl2C8smiB Qpcg== X-Received: by 10.180.108.106 with SMTP id hj10mr8863358wib.0.1364804178038; Mon, 01 Apr 2013 01:16:18 -0700 (PDT) MIME-Version: 1.0 Received: by 10.194.219.135 with HTTP; Mon, 1 Apr 2013 01:15:57 -0700 (PDT) In-Reply-To: <5158F0FC.3070104@jesup.org> References: <5158F0FC.3070104@jesup.org> From: "piranna@gmail.com" Date: Mon, 1 Apr 2013 10:15:57 +0200 Message-ID: To: Randell Jesup Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable X-Mailman-Approved-At: Mon, 01 Apr 2013 09:24:37 -0700 Cc: "rtcweb@ietf.org" , "public-webrtc@w3.org" Subject: Re: [rtcweb] DataChannels API and external negotiation X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 01 Apr 2013 08:31:33 -0000 > /* If either maxRetransmitTime or maxRetransmitNum are set, it's > unreliable, else it's a reliable channel. If both are set it's an > error. I don't think so (except if it's a limitation of SCTP that I didn't know, so this message is useless). I think it would make sense to be able to set both maxRetransmitTime and maxRetransmitNum at the same time, only that since they are maximus limits it would be effective the first to be reached. -- "Si quieres viajar alrededor del mundo y ser invitado a hablar en un monton de sitios diferentes, simplemente escribe un sistema operativo Unix." =96 Linus Tordvals, creador del sistema operativo Linux From piranna@gmail.com Mon Apr 1 02:46:14 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D895A21F81FE for ; Mon, 1 Apr 2013 02:46:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TNRTb8hNB0DR for ; Mon, 1 Apr 2013 02:46:14 -0700 (PDT) Received: from mail-wi0-x22a.google.com (mail-wi0-x22a.google.com [IPv6:2a00:1450:400c:c05::22a]) by ietfa.amsl.com (Postfix) with ESMTP id 9129821F8881 for ; Mon, 1 Apr 2013 02:46:10 -0700 (PDT) Received: by mail-wi0-f170.google.com with SMTP id hm11so2002701wib.3 for ; Mon, 01 Apr 2013 02:46:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:content-transfer-encoding; bh=EoHnXmOva8fCkB1uQycMBFLuIedgqZsrVrIsxbqeBoI=; b=s3sifl3CRnoa7/W8iEbPcH24jIXftxiPAqCPXyFSdjRbSyVmFmfeqVEdxxxc+e+YKi 7zd0n91XI9uMz5rBQ1KAZkgVsXFlosrs/LpwpnjqH6b37W15YtIaP3WrB3hDkcPM6yJi 4VZWr+GtFB8WcJ7ryIWCpGgiHZjN0wlwijjXlDPkpvlzKQVgSq1lzAi6LoVGxoRvAggs SUWbYm/tBcD9nX9DvYwZuK7QGQam9WQIPZCQ6aAlOTxpriAmsPpY5lmhSRc8Og3oZtnd Okr9QGcC7cZEotA83efJ7fVCci4/73ti9iBCFrY1eCIjSQsIL8Vncrn2sKKqVMDc6ajs 1tzg== X-Received: by 10.194.20.40 with SMTP id k8mr14875311wje.16.1364809569736; Mon, 01 Apr 2013 02:46:09 -0700 (PDT) MIME-Version: 1.0 Received: by 10.194.219.135 with HTTP; Mon, 1 Apr 2013 02:45:49 -0700 (PDT) In-Reply-To: References: <5158F0FC.3070104@jesup.org> From: "piranna@gmail.com" Date: Mon, 1 Apr 2013 11:45:49 +0200 Message-ID: To: Michael Tuexen Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable X-Mailman-Approved-At: Mon, 01 Apr 2013 09:25:01 -0700 Cc: Randell Jesup , "rtcweb@ietf.org" , "public-webrtc@w3.org" Subject: Re: [rtcweb] DataChannels API and external negotiation X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 01 Apr 2013 09:46:15 -0000 Ok, thanks for the clarification. 2013/4/1 Michael Tuexen : > On Apr 1, 2013, at 10:15 AM, piranna@gmail.com wrote: > >>> /* If either maxRetransmitTime or maxRetransmitNum are set, it's >>> unreliable, else it's a reliable channel. If both are set it's an >>> error. >> >> I don't think so (except if it's a limitation of SCTP that I didn't >> know, so this message is useless). I think it would make sense to be >> able to set both maxRetransmitTime and maxRetransmitNum at the same >> time, only that since they are maximus limits it would be effective >> the first to be reached. > SCTP allows setting a single PR-SCTP policy packet. Supported ones are > limiting the number of retransmissions and time to live. Not a combinatio= n > of both. That is why you are only providing a single PR-SCTP value. > > If you want to limit both, you need to define a new PR-SCTP policy. That > policy would also require two parameters (the number of retransmissions a= nd > the time to live in ms) as parameters, not only one as we have currently. > > So without defining a new PR-SCTP policy, the above text is correct. > > Best regards > Michael >> >> >> >> -- >> "Si quieres viajar alrededor del mundo y ser invitado a hablar en un >> monton de sitios diferentes, simplemente escribe un sistema operativo >> Unix." >> =96 Linus Tordvals, creador del sistema operativo Linux >> >> > --=20 "Si quieres viajar alrededor del mundo y ser invitado a hablar en un monton de sitios diferentes, simplemente escribe un sistema operativo Unix." =96 Linus Tordvals, creador del sistema operativo Linux From martin.thomson@gmail.com Mon Apr 1 09:48:44 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 06DA511E80D1 for ; Mon, 1 Apr 2013 09:48:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -7.099 X-Spam-Level: X-Spam-Status: No, score=-7.099 tagged_above=-999 required=5 tests=[AWL=-3.500, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rdXWwlRtd1SU for ; Mon, 1 Apr 2013 09:48:43 -0700 (PDT) Received: from mail-wg0-f47.google.com (mail-wg0-f47.google.com [74.125.82.47]) by ietfa.amsl.com (Postfix) with ESMTP id 01C7C11E80A2 for ; Mon, 1 Apr 2013 09:48:42 -0700 (PDT) Received: by mail-wg0-f47.google.com with SMTP id y10so2220071wgg.26 for ; Mon, 01 Apr 2013 09:48:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=Ga5gPeyVLmCo3vMCkncZqsuHXv3/HGMzUu94C8OwZbI=; b=azyj0KHep6/cLBLfZyXIDHFNUNG+Eig01oGW4JooGJhpXEYOA6JLeRS613+F+CJcJV B8mJN4E87DTUpfUEdb+fUPtD4PKK94xAdkj8ETFfJQ5wQvLC84H0ppj7UEQGuehhmMhr M5SBilWwNS0s314yDZ+bfnaAPwYOpoBjwpnomhBsHmrZCsDKJX+h05PIJR4H95QNtUna OTi4tmgB5Azru3hJ1LgfgxCFGIlUHbljl/Ala6Ai4E/MjM4kmIYZNnHkwSp7QmVkJ7bo Nlpi+cU3G0H/AaI3ZdUZzIwMnwYx9g4jdCX0LqvKf3gleXvUH3vBEEbUScXQuKAx6xmz JI/A== MIME-Version: 1.0 X-Received: by 10.194.82.104 with SMTP id h8mr16704070wjy.3.1364834922021; Mon, 01 Apr 2013 09:48:42 -0700 (PDT) Received: by 10.194.41.35 with HTTP; Mon, 1 Apr 2013 09:48:41 -0700 (PDT) In-Reply-To: <5158F0FC.3070104@jesup.org> References: <5158F0FC.3070104@jesup.org> Date: Mon, 1 Apr 2013 09:48:41 -0700 Message-ID: From: Martin Thomson To: Randell Jesup Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" , "public-webrtc@w3.org" Subject: Re: [rtcweb] DataChannels API and external negotiation X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 01 Apr 2013 16:48:44 -0000 This looks fine, but I'd like to bike shed just a little. On 31 March 2013 19:29, Randell Jesup wrote: > Here's a proposed API for DataChannels with external negotiation, per the > recent Interim and IETF meeting (most of this was in my previous W3 email, > but I've added info on when 'stream' is valid to read, and how even/odd > roles are assigned for the IETF protocol). I'll note for the IETF folks that > 'protocol' is in a JS dictionary object in this update, which avoids > breaking any current experimental applications (and avoids them having any > incentive to UA-sniff). Also, I think it works better in the dictionary. > > channel = peerconnection.createDataChannel(label, dictionary_object); > > /* If either maxRetransmitTime or maxRetransmitNum are set, it's > unreliable, else it's a reliable channel. If both are set it's an > error. outOfOrderAllowed can be used with any type of channel. The > equivalent of UDP is { outOfOrderAllowed: true, maxRetransmitNum: 0 }. > The TCP equivalent is {}. > > preset is set to true if the channel is being externally negotiated, and > no wireline OpenRequest message should be sent. If preset is true, > stream > can be optionally used to set a specific SCTP stream to use. If it's > not set but preset is true, then the application should read the 'stream' > attribute from the returned DataChannel after onopen and convey it to the > other end to pass in via the DataChannelInit dictionary. > */ A lot of your text can be replaced by defaults on the dictionary. I prefer 'ordered' over 'outOfOrderAllowed', even if it means an inversion of the values. 'rtxCount' or 'retransmitCount' rather than 'maxRetransmitNum' (max is implied). 'preset' doesn't sound right, maybe you could have 'inlineOpen' (default: true) to convey what is really happening here. > dictionary DataChannelInit { > boolean ordered = true; > unsigned short retransmitPeriod = 65535; // ! > unsigned short retransmitCount = 65535; > DOMString protocol; // default: undefined > boolean inlineOpen = true; > unsigned short stream; // default: browser selected > }; unsigned short is an unusual type for time intervals, even if you don't foresee a need for more than 65 seconds. Oh, and that assumes that you are using milliseconds, right? From ted.ietf@gmail.com Mon Apr 1 10:40:40 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 73D7911E80D3 for ; Mon, 1 Apr 2013 10:40:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0 X-Spam-Level: X-Spam-Status: No, score=x tagged_above=-999 required=5 tests=[] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ALfdCXkV0EU7 for ; Mon, 1 Apr 2013 10:40:40 -0700 (PDT) Received: from mail-ia0-x22b.google.com (mail-ia0-x22b.google.com [IPv6:2607:f8b0:4001:c02::22b]) by ietfa.amsl.com (Postfix) with ESMTP id 192E411E80AE for ; Mon, 1 Apr 2013 10:40:39 -0700 (PDT) Received: by mail-ia0-f171.google.com with SMTP id z13so2094390iaz.30 for ; Mon, 01 Apr 2013 10:40:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=EkThYJG+0WzbCf64GZiJeOwRFiy33ct5u53QjvsDqmA=; b=O4aKek3ukwvaBx5Y4mkek3qW8ItjkZsfH8NA65ooiFtC01RDJ5PghgkV887UM/rqyG NQCivdU4hMkLR1uWYsMXPZNWy0Xqr8ga19gaVDSqppQZHEaUevKUol7G2LuSU6x8zZLW 3tk7saHBV/umRDfrbY0FzD8xe+nqzZJsK91btZpuJTHwSM/35d8Rsi81Ag+t/G+84mXD H/SSymOAbuHaIoGO2EVSVwnXbH0AMNIMTY4km4UszzIrPV197hHQZ4qV7GodGheOPAXC MElX42m8vmAfDoeCbx6AwdWSoLK5To6npDndanVcKYk7/2v82w71y8V63mBWm4wt3MLu 6cpQ== MIME-Version: 1.0 X-Received: by 10.50.93.3 with SMTP id cq3mr3845762igb.70.1364838038609; Mon, 01 Apr 2013 10:40:38 -0700 (PDT) Received: by 10.43.135.202 with HTTP; Mon, 1 Apr 2013 10:40:38 -0700 (PDT) In-Reply-To: <51562335.1020409@acm.org> References: <51562335.1020409@acm.org> Date: Mon, 1 Apr 2013 10:40:38 -0700 Message-ID: From: Ted Hardie To: Marc Petit-Huguenin Content-Type: multipart/mixed; boundary=047d7b2e3e0077f3a004d9501e0d Cc: Cullen Jennings , "rtcweb@ietf.org" Subject: Re: [rtcweb] DRAFT minutes for RTCWEB day two X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 01 Apr 2013 17:40:40 -0000 --047d7b2e3e0077f3a004d9501e0d Content-Type: multipart/alternative; boundary=047d7b2e3e0077f39b04d9501e0b --047d7b2e3e0077f39b04d9501e0b Content-Type: text/plain; charset=ISO-8859-1 On Fri, Mar 29, 2013 at 4:26 PM, Marc Petit-Huguenin wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 > > On 03/29/2013 04:01 PM, Ted Hardie wrote: > > Attached are draft minutes for the second day of the RTCWEB meetings at > > IETF 86, please review and send comments to the list. > > > > I predict that a lot of people that are not familiar with the core group of > RTCweb participants will read this minutes, so I would suggest to check > that > the first time a name appears in the minutes, it is the full name of the > person, not just the first name (and perhaps with the full name all > uppercase > so it is easier to find). E.g. in the first paragraph, "Martin" should be > replaced by "Martin Thomson" or "MARTIN THOMSON". Same for "Giri", > "Gaelle", > "Daryl", "Kalyani", "Hadriel". > > Ok, I've added last names where I know them or could hear them on the recording. There are a few that remain unclear to me. Attached is the updated version; if folks could review it and give names where they know them, that would be useful. thanks, Ted > Thanks. > > - -- > Marc Petit-Huguenin > Email: marc@petit-huguenin.org > Blog: http://blog.marc.petit-huguenin.org > Profile: http://www.linkedin.com/in/petithug > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.12 (GNU/Linux) > > iQIcBAEBCAAGBQJRViMzAAoJECnERZXWan7End0P/1z11JwuljlRMNPrT7urE584 > OwP4oQ5ayj+e9/E05NCoMMCk6guLSlPEvpcoBKeEjTFeLuN1k+R0HC9X35zYYX+F > hsMq5px5+sN4GfoYCHkg9bT9lA9y718kSBhoUw2IBoYS3xPI3dnQwvXjzWV4UevU > xNP7HP0VPBm/wTTVaohX2kU3VcJTBol0FsdkIJPVJ/+19KpFm6cqLaPIGx39atW3 > AQzjEhd7BzlxOEn5xK4FOy0tje9v3Hf+ifGihCDJDMTid9bFI4fGbOdKv/jkr9lG > XHA/Uv0C31FMMBbQ1Xtni3/xTTFKuHNhcaaBDPX/yuKLbmWBEuOtycsBCUviUPs5 > //88tT2Y1WVWUNvc6WHfEjmpGeThT3YmRjDkFRZAnVSq8rKnxJlnDJdUzvFkBdVg > /B2wh86C6lvkh6B48d322EEJ1iMnAjWSOs2+S1x6kkTR/ckk1MwEzxl8/cpkPOJ/ > UMmCzQW5abwRA84IV2LPSemuSnUBfShWxAN50JEIUBuJPD/8rEH1vOoZkBE+SF0g > bPJswDJN/maJjXb12GEaKhZMp/ghZqIQapoaBNLVAmWetTkOhRcICLpF4tF5yGkW > 6lLgSOUwF4RoK68r5sP0RaHHDE1tzUt4Tp2WsTf6yONOaYM4jpjCKF1/8j7JjClk > vnk5NuNAHxsq06pnuA1p > =WN5e > -----END PGP SIGNATURE----- > --047d7b2e3e0077f39b04d9501e0b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Fri, Mar 29, 2013 at 4:26 PM, Marc Petit-Huguenin <= petithug@acm.org&= gt; wrote:
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

On 03/29/2013 04:01 PM, Ted Hardie wrote:
> Attached are draft minutes for the second day of the RTCWEB meetings a= t
> IETF 86, please review and send comments to the list.
>

I predict that a lot of people that are not familiar with the core gr= oup of
RTCweb participants will read this minutes, so I would suggest to check tha= t
the first time a name appears in the minutes, it is the full name of the person, not just the first name (and perhaps with the full name all upperca= se
so it is easier to find). =A0E.g. in the first paragraph, "Martin"= ; should be
replaced by "Martin Thomson" or "MARTIN THOMSON". =A0Sa= me for "Giri", "Gaelle",
"Daryl", "Kalyani", "Hadriel".


Ok, I've added last names where I know them o= r could hear them on the recording.=A0 There are a few that remain unclear = to me.=A0 Attached is the updated version; if folks could review it and giv= e names where they know them, that would be useful.

thanks,

Ted


=A0
Thanks.

- --
Marc Petit-Huguenin
Email: marc@petit-huguenin.org
Blog: htt= p://blog.marc.petit-huguenin.org
Profile: = http://www.linkedin.com/in/petithug
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([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0tSuqv9Yz8pO for ; Mon, 1 Apr 2013 13:00:29 -0700 (PDT) Received: from r2-chicago.webserversystems.com (r2-chicago.webserversystems.com [173.236.101.58]) by ietfa.amsl.com (Postfix) with ESMTP id CAF3C11E80E6 for ; Mon, 1 Apr 2013 13:00:27 -0700 (PDT) Received: from pool-98-111-140-34.phlapa.fios.verizon.net ([98.111.140.34]:4526 helo=[192.168.1.12]) by r2-chicago.webserversystems.com with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.80) (envelope-from ) id 1UMku1-000BcP-Sb; Mon, 01 Apr 2013 15:00:26 -0500 Message-ID: <5159E6F9.4070808@jesup.org> Date: Mon, 01 Apr 2013 15:58:49 -0400 From: Randell Jesup User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130307 Thunderbird/17.0.4 MIME-Version: 1.0 To: public-webrtc@w3.org, "rtcweb@ietf.org" References: <5158F0FC.3070104@jesup.org> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - r2-chicago.webserversystems.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - jesup.org Subject: Re: [rtcweb] DataChannels API and external negotiation X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 01 Apr 2013 20:00:30 -0000 On 4/1/2013 12:48 PM, Martin Thomson wrote: > This looks fine, but I'd like to bike shed just a little. > > On 31 March 2013 19:29, Randell Jesup wrote: >> Here's a proposed API for DataChannels with external negotiation, per the >> recent Interim and IETF meeting (most of this was in my previous W3 email, >> but I've added info on when 'stream' is valid to read, and how even/odd >> roles are assigned for the IETF protocol). I'll note for the IETF folks that >> 'protocol' is in a JS dictionary object in this update, which avoids >> breaking any current experimental applications (and avoids them having any >> incentive to UA-sniff). Also, I think it works better in the dictionary. >> >> channel = peerconnection.createDataChannel(label, dictionary_object); >> >> /* If either maxRetransmitTime or maxRetransmitNum are set, it's >> unreliable, else it's a reliable channel. If both are set it's an >> error. outOfOrderAllowed can be used with any type of channel. The >> equivalent of UDP is { outOfOrderAllowed: true, maxRetransmitNum: 0 }. >> The TCP equivalent is {}. >> >> preset is set to true if the channel is being externally negotiated, and >> no wireline OpenRequest message should be sent. If preset is true, >> stream >> can be optionally used to set a specific SCTP stream to use. If it's >> not set but preset is true, then the application should read the 'stream' >> attribute from the returned DataChannel after onopen and convey it to the >> other end to pass in via the DataChannelInit dictionary. >> */ > A lot of your text can be replaced by defaults on the dictionary. > > I prefer 'ordered' over 'outOfOrderAllowed', even if it means an > inversion of the values. Probably is easier to understand, and defaults help. > 'rtxCount' or 'retransmitCount' rather than > 'maxRetransmitNum' (max is implied). I don't know that removing 'max' helps here or hurts. Also, sorta-acronyms like rtx are obvious to networking people; not so much to JS app developers. I see only minimal advantage here to brevity. Count might be an improvement on Num. > 'preset' doesn't sound right, maybe you could have 'inlineOpen' > (default: true) to convey what is really happening here. externallyNegotiated (default: false)? Not great, but "inlineOpen" will be pretty meaningless to most developers who probably could care less if there's an in-band open message for a channel (whether externally negotiated or not) - or even know there's an in-band message. Then again, 99% of developers don't need to care about this anyways. >> dictionary DataChannelInit { >> boolean ordered = true; >> unsigned short retransmitPeriod = 65535; // ! >> unsigned short retransmitCount = 65535; >> DOMString protocol; // default: undefined >> boolean inlineOpen = true; >> unsigned short stream; // default: browser selected >> }; > unsigned short is an unusual type for time intervals, even if you > don't foresee a need for more than 65 seconds. Oh, and that assumes > that you are using milliseconds, right? Unsigned short has been the type in the protocol fields since the first draft (like a year). Perhaps a silly optimization, though I think if you want partial reliability with >64K resends, or >64 seconds of retry that you *really* want reliable transmission (perhaps unordered, but reliable). If we want to change it, now's the time, since we're breaking binary compatibility in FF with my landing today anyways. -- Randell Jesup randell-ietf@jesup.org From martin.thomson@gmail.com Mon Apr 1 13:25:00 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2DE3621E80AA for ; Mon, 1 Apr 2013 13:24:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pvc8elc2rEzl for ; Mon, 1 Apr 2013 13:24:57 -0700 (PDT) Received: from mail-wg0-x22a.google.com (mail-wg0-x22a.google.com [IPv6:2a00:1450:400c:c00::22a]) by ietfa.amsl.com (Postfix) with ESMTP id 1A6DC21E80B2 for ; Mon, 1 Apr 2013 13:24:52 -0700 (PDT) Received: by mail-wg0-f42.google.com with SMTP id k13so2476571wgh.3 for ; Mon, 01 Apr 2013 13:24:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=P/L2Mlnb/ad0ipnECDzuzp/Fke7MJXVWi7gfgA6t1qY=; b=u82XysjkLUcY0b9/ezS8xluQXfOr+v6AOPFReKUDIGQ0IuPCDZsCxdXfNSrskD6LON p7W5gcdE5DETy8YPZsoM+3MAHp4RCV3Vuv1Codxy7lmwCLBdxRlAfDh5vOSH3xMFw2dg u085EGyxuPs1Nuo6yJGOCbStjVdE/9W67TbBLtapMpvBYTgARgXtstBjPYK6Ttpo4/3k URGo7ErnA+lxoYcOLfWTpgRMtDKW+wXnrDktaOp9SWFMMsxDx90SDz6BRNlUTfTFEk9F HKw2+n/tuY0jBXw9Ma8ACu31yM5n6BkFgpLvgLyxhoXmNFBiUUL4RSW7D7rHTmuuu/6I 6JRg== MIME-Version: 1.0 X-Received: by 10.194.92.231 with SMTP id cp7mr17458622wjb.19.1364847887821; Mon, 01 Apr 2013 13:24:47 -0700 (PDT) Received: by 10.194.41.35 with HTTP; Mon, 1 Apr 2013 13:24:47 -0700 (PDT) In-Reply-To: <5159E6F9.4070808@jesup.org> References: <5158F0FC.3070104@jesup.org> <5159E6F9.4070808@jesup.org> Date: Mon, 1 Apr 2013 13:24:47 -0700 Message-ID: From: Martin Thomson To: Randell Jesup Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" , "public-webrtc@w3.org" Subject: Re: [rtcweb] DataChannels API and external negotiation X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 01 Apr 2013 20:25:02 -0000 On 1 April 2013 12:58, Randell Jesup wrote: > I don't know that removing 'max' helps here or hurts. Also, sorta-acronyms > like rtx are obvious to networking people; not so much to JS app developers. > I see only minimal advantage here to brevity. Count might be an improvement > on Num. Yeah, 'rtx' is probably too aggressively short. >> 'preset' doesn't sound right, maybe you could have 'inlineOpen' >> (default: true) to convey what is really happening here. > > > externallyNegotiated (default: false)? Not great, but "inlineOpen" will be > pretty meaningless to most developers who probably could care less if > there's an in-band open message for a channel (whether externally negotiated > or not) - or even know there's an in-band message. Then again, 99% of > developers don't need to care about this anyways. Yes, I didn't get a warm fuzzy from my suggested name either, but you are right about the impact being relatively low. Other ideas: "announceSettings" (default: true), "prearranged" (default: false), "thisIsNotATest" (default: "yesItIs"). > Unsigned short has been the type in the protocol fields since the first > draft (like a year). Perhaps a silly optimization, though I think if you > want partial reliability with >64K resends, or >64 seconds of retry that you > *really* want reliable transmission (perhaps unordered, but reliable). If > we want to change it, now's the time, since we're breaking binary > compatibility in FF with my landing today anyways. Well, you'll be accepting a JS number, so it doesn't really matter what the spec says. From jonathan@vidyo.com Mon Apr 1 15:54:26 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AEFF421E8102 for ; Mon, 1 Apr 2013 15:54:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jlv4qSdSP447 for ; Mon, 1 Apr 2013 15:54:20 -0700 (PDT) Received: from mxout.myoutlookonline.com (mxout.myoutlookonline.com [64.95.72.241]) by ietfa.amsl.com (Postfix) with ESMTP id 3513021E80F6 for ; Mon, 1 Apr 2013 15:54:19 -0700 (PDT) Received: from mxout.myoutlookonline.com (localhost [127.0.0.1]) by mxout.myoutlookonline.com (Postfix) with ESMTP id 96BBE7A5870 for ; Mon, 1 Apr 2013 18:54:18 -0400 (EDT) X-Virus-Scanned: by SpamTitan at mail.lan Received: from HUB023.mail.lan (unknown [10.110.2.1]) by mxout.myoutlookonline.com (Postfix) with ESMTP id 13BE17A5336 for ; Mon, 1 Apr 2013 18:54:08 -0400 (EDT) Received: from BE235.mail.lan ([10.110.32.235]) by HUB023.mail.lan ([10.110.17.23]) with mapi; Mon, 1 Apr 2013 18:53:20 -0400 From: Jonathan Lennox To: "rtcweb@ietf.org" Date: Mon, 1 Apr 2013 18:54:06 -0400 Thread-Topic: [avtext] WGLC for draft-ietf-avtext-multiple-clock-rates-08 Thread-Index: Ac4vK9DLDVBbqRA1QUa0SFmFUTSmNg== Message-ID: <2ABE971C-07AA-4D69-BC76-713A20DC0FF8@vidyo.com> References: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: [rtcweb] Fwd: [avtext] WGLC for draft-ietf-avtext-multiple-clock-rates-08 X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 01 Apr 2013 22:54:26 -0000 Hello, all -- (As AVTExt co-chair) The draft "Support for Multiple Clock Rates in an RTP Session", whose recom= mendations are cited as MUST follow in the RTCWeb RTP usage document, is in= WGLC in the AVTExt working group. Please review this draft, and send any comments to the avtext mailing list. Thanks! Begin forwarded message: > From: Jonathan Lennox > Subject: [avtext] WGLC for draft-ietf-avtext-multiple-clock-rates-08 > Date: March 27, 2013 5:15:19 PM EDT > To: "avtext@ietf.org" >=20 > (As WG cochair) >=20 > This is to announce a working group last call for draft-ietf-avtext-multi= ple-clock-rates-08: >=20 > https://datatracker.ietf.org/doc/draft-ietf-avtext-multiple-clock-rates/ >=20 > Please respond to the list by April 17 2013 (i.e. 3 weeks time) with any = comments. >=20 > This is intended as a standards track RFC, updating RFC 3550. >=20 > It is helpful to attempt to categorise the type of your comment (includin= g severity) and also to assist to provide any replacement text you feel is = necessary. >=20 > If you review the document and have no comments, please tell the chairs t= hat you have reviewed it. This is always useful information in assessing th= e degree of WG review and consensus behind the document. >=20 >=20 > -- > Jonathan Lennox > jonathan@vidyo.com >=20 >=20 > _______________________________________________ > avtext mailing list > avtext@ietf.org > https://www.ietf.org/mailman/listinfo/avtext >=20 -- Jonathan Lennox jonathan@vidyo.com From magnus.westerlund@ericsson.com Tue Apr 2 01:15:40 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5D4FC21F984B for ; Tue, 2 Apr 2013 01:15:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.249 X-Spam-Level: X-Spam-Status: No, score=-106.249 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vnUSGyExuoUP for ; Tue, 2 Apr 2013 01:15:39 -0700 (PDT) Received: from mailgw7.ericsson.se (mailgw7.ericsson.se [193.180.251.48]) by ietfa.amsl.com (Postfix) with ESMTP id 5AFE221F988B for ; Tue, 2 Apr 2013 01:15:35 -0700 (PDT) X-AuditID: c1b4fb30-b7f0d6d000007e61-be-515a939e0fe7 Received: from esessmw0191.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw7.ericsson.se (Symantec Mail Security) with SMTP id 27.B1.32353.E939A515; Tue, 2 Apr 2013 10:15:26 +0200 (CEST) Received: from [127.0.0.1] (153.88.115.8) by esessmw0191.eemea.ericsson.se (153.88.115.85) with Microsoft SMTP Server id 8.3.279.1; Tue, 2 Apr 2013 10:15:25 +0200 Message-ID: <515A939D.2070405@ericsson.com> Date: Tue, 2 Apr 2013 10:15:25 +0200 From: Magnus Westerlund User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130307 Thunderbird/17.0.4 MIME-Version: 1.0 To: "rtcweb@ietf.org" References: <51541502.90406@ericsson.com> In-Reply-To: <51541502.90406@ericsson.com> X-Enigmail-Version: 1.5.1 X-Forwarded-Message-Id: <51541502.90406@ericsson.com> Content-Type: multipart/mixed; boundary="------------050906060904060507000001" X-Brightmail-Tracker: H4sIAAAAAAAAA2WSfUhTYRTGOfNuuxuY1/nRUSFrFqVSGVgKiYQV+EeCYh/TpBx1UdFEplki xbRQ0VDzo/SmoqUzE9FsmZkITtT8yEY2S8qJK0klJREt86O2+y4Q+u93zvuc9304z0vbyIxC VzouMYVVJSoT5CIpVa7YuLG/qjgyzMew7OHftJktPgbBtbWrglCIlAZcZhPiUlnVwcBoaexY aw0k/Tl+vaalU6yGxaO5IKGR8cUezaiIsDPqjc1mltIyZhAw17QgJIUG8H1FAa+yZbzxbt4S 5AJNU8xuXFvbYWmLGH8c/5XBS5yYcFydG6aI3B4Hyr/y7MjsxdEpvdgy6mDWNPzwtbRljCeu Z/SDhSWMF/YaBwXEjwtqZ7LFhA+jvlMttLANE4qmji4hmfVGdWaOsBDsuS2vcVtkhA9gieE2 EHbHF/MVNoSTUKMZFvzfzwV8thLG8U9H43jHuPlOyyY6AMcMIyJSPAX8NlxqPXkJWFrUIiRF KeB3bp4vKCaPwrrsPjG5bBfmPyzkmWJ24gO1GshEI2DWwAIQ0T4sa9CbmTazHTbpPDhrPjlv vggJ2+JQST/vA5lawN8TS1ZTbwGf95pEHL+dLsBm3TbOmnTVu0oxEQ0B/hzmrM7rATdnjRRZ oCdmajVC4m8P1q608V7/xcvx8Z7B0r6PvN6RkeH9gkIBZ82icWIZqsHvCYivKOMSYq75tYL5 j3Zr13zaoXXSWQduNCXfbnvupD5UxsQoU9h4lk1iVRdVVxPYZB0IaImrGtK8uSyHGpPiQ6Pf xGuHhQqvoIF0fVPJol1chMKl4abbiaCi9fR5bWDAJDuTn5Ya3/zp/MrpmLDHscGSU9Lu4jCn EU39UrsiPCLqs9tU29wr9+7K2VumslSTLOTsnfTw6UvVgY8qessM8415UReOTK8a6tzGN3Ty JXmIrWniXk+VnEqOVR7yslElK/8CCGUto3EDAAA= Subject: [rtcweb] Fwd: [AVTCORE] Reminder: Re: WG last call on draft-ietf-avtcore-6222bis-01 X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 Apr 2013 08:15:40 -0000 --------------050906060904060507000001 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit RTCWEB WG, This is another of the normative reference that are in WG last call. This is a short document so please review it and send notice to the AVTCORE WG (avt@ietf.org) with any issues or a note stating that you think it is ready for publication. Thanks Magnus Westerlund AVTCORE and RTCWEB chair --------------050906060904060507000001 Content-Type: message/rfc822; name="[AVTCORE] Reminder: Re: WG last call on draft-ietf-avtcore-6222bis-01.eml" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename*0="[AVTCORE] Reminder: Re: WG last call on draft-ietf-avtcore-6"; filename*1="222bis-01.eml" X-Mozilla-Keys: Received: from esessmw0191.eemea.ericsson.se (153.88.115.84) by ESESSHC016.ericsson.se (153.88.183.66) with Microsoft SMTP Server (TLS) id 14.2.318.4; Thu, 28 Mar 2013 11:02:03 +0100 Received: from sesbmg11.ericsson.net (153.88.115.8) by esessmw0191.eemea.ericsson.se (153.88.115.86) with Microsoft SMTP Server id 8.3.279.1; Thu, 28 Mar 2013 11:02:01 +0100 Received: from mail.ietf.org (mail.ietf.org [12.22.58.30]) by sesbmg11.ericsson.net (Symantec Mail Security) with SMTP id 40.11.03977.81514515; Thu, 28 Mar 2013 11:02:01 +0100 (CET) Received: from ietfa.amsl.com (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B1A6721F8ED4; Thu, 28 Mar 2013 03:01:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ietf.org; s=ietf1; t=1364464919; bh=UEKlW+dlzMJ4J6p3W5RliMksrednYEZva9SbyW1SJdg=; h=Message-ID:Date:From:MIME-Version:To:References:In-Reply-To: Subject:List-Id:List-Unsubscribe:List-Archive:List-Post:List-Help: List-Subscribe:Content-Type:Content-Transfer-Encoding:Sender; b=TLTro2GpjwIA1Rnj8lbyZqa287tSmFMgnjYG1vgszPtW52FmKPiSKL8N4rhBX+Z83 fHUat3jr201feab0FNVJq3mLRUWFolkzN7FXABSLS+1jg+DlZV5SD3Kp2ayoIubryY Ey26ePAX8zUOU0wGda2Po5QCDro/izSNL3N1JT1I= X-Original-To: avt@ietfa.amsl.com Delivered-To: avt@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E0A9B21F8E7D for ; Thu, 28 Mar 2013 03:01:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.001 X-Spam-Level: X-Spam-Status: No, score=-106.001 tagged_above=-999 required=5 tests=[AWL=0.248, BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XtWA-g5jqLib for ; Thu, 28 Mar 2013 03:01:56 -0700 (PDT) Received: from mailgw2.ericsson.se (mailgw2.ericsson.se [193.180.251.37]) by ietfa.amsl.com (Postfix) with ESMTP id 97BE521F8E6B for ; Thu, 28 Mar 2013 03:01:48 -0700 (PDT) X-AuditID: c1b4fb39-b7fa76d000000f89-19-5154151817c1 Received: from esessmw0184.eemea.ericsson.se (Unknown_Domain [153.88.253.124]) by mailgw2.ericsson.se (Symantec Mail Security) with SMTP id 0A.01.19728.B0514515; Thu, 28 Mar 2013 11:01:47 +0100 (CET) Received: from [127.0.0.1] (153.88.115.8) by esessmw0184.eemea.ericsson.se (153.88.115.82) with Microsoft SMTP Server id 8.3.279.1; Thu, 28 Mar 2013 11:01:47 +0100 Message-ID: <51541502.90406@ericsson.com> Date: Thu, 28 Mar 2013 11:01:38 +0100 From: Magnus Westerlund User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130307 Thunderbird/17.0.4 To: References: <513F7C5B.5060101@ericsson.com> In-Reply-To: <513F7C5B.5060101@ericsson.com> X-Enigmail-Version: 1.5.1 X-Brightmail-Tracker: H4sIAAAAAAAAA1VTbUxTVxjm3N57e6m9ciwWXqpbpMbvDSWZ7kiUmGxLhpqFKv7xD1a9th2l Nr3VsT9LqTMYTAmoBHADEatdZ5YiqXz8QagC4lcqBvkSljF+8JH4mTLBma23l/rx73nO87zv 85zkHE6hec7qOKHIKThsRqueVdHqlKxPP0/T5hk2DUQY4h4NKkm45iYiTUN2cv2ZgzT5/BR5 OtClJB5/HUMGb5dQpNgtkuseF0PCvf8qSF9gjCI1tfnkiX8Ykdo5A/EMuGnSMVysJDc6Zlky NhdhSdXJ7eTWnaeKHdpv5yP9bC7ar9p2WLBajguOjdkHVOZ+9xPW7k8qqvHVMy7Uoi5FiRzg L6Cur1Yp4xQIjwXYUqTiNLgFQbCvWSmTKgST17ooidD4NA2XS7oXRtKhrKE8hmm8An5xuZCE NfgqglBbtuxZC9X+cPSci+Ik+CO0Mp526v7fjIwXw8PJ17H9gL0I5kdfLdR4iODUiaEF0o5g qvM0Ey/eVdVLycJdBP/cO0/LxIego2KOlVw8Xgfu4BVG7rcKvLPNsa4sJjD0ujjm0eJ9UNk9 SMv+JdBbMxHDSzGG31re0vJ9NsDV0Ujsbon4MwgM+2i5RRoEJ0uUcvFmBirCj2NLk3Eu1M3e ZuKmkfYpFMelnolYCRwNqPO2UeVo/fkPsiWswBkwWHmOlfEGuHJxRlGPFL8jrSiIBwtNmZkZ gsNySBSP2jJsgrMJRZ9ZZ/DN1lbU4P0yhNI4Sq/lW5PzDJrFB48e/tFsFM35jmNWQQyhZRyt T+VbR7y5GmwyOoUCQbALjri6nOP0wHdLk0scgkkoOmKxOt/LFJcYQsCp9Uv5HsnDi3ZjoWgx yfodlK5L5S9JApYE8zHbu9n4R+hDn+iSeZSQkKBRR3MLLc6P9WmUyiF9Ml8pbVFbbM5326ej wVQ02BfZKwU7je8lnQst024O2ElZx0hw2pCRs2a+8ft+uunEd6HsRe1nxwabs2Z2bct/YyhY laP9+tedNx+cme78ubHlP89PuvELj1N65v/svdyWnrtnciovMrHHptl9v3z16Ky1oOyvl4Gy i9X+F6rxnTk3+ENfZX1zpHbzI+fADz1bfK2N6wzV5vKKoS20qVFPi2Zj5nqFQzT+D6bC5GoD BAAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrFJMWRmVeSWpSXmKPExsUyM+JvjS63aEigwamdOhYve1ayOzB6LFny kymAMYrLJiU1J7MstUjfLoEr49O0JawFr3krLjw/z9TAOIe7i5GTQ0LAROLo9JNMELaYxIV7 69m6GLk4hAROMkr8fXYVylnOKPHs721WkCpeAU2Jpi3LwGwWAVWJJd+2sYPYbAIWEjd/NLKB 2KICwRI/X51hgagXlDg58wmYLSIgILFi+18gm4NDWMBP4u95sHIhAW2J1Xe/MoLYnAI6Eutv LWeBOEhSYsuLdrDxzAJ6ElOutjBC2PISzVtnM8P0NjR1sE5gFJyFZNssJC2zkLQsYGRexcie m5iZk15utIkRGH4Ht/xW3cF455zIIUZpDhYlcd5w1wsBQgLpiSWp2ampBalF8UWlOanFhxiZ ODilGhi7/utpKx3kz+vdJJPQt0Dt1ZFvkne0I4v33jiZzZ6tnZG93o7jkfQFp8JQtRNhs8Kn bHH3Uii5HzbZeztP4o6GCe/Nj049GTq9inXzxKCDT4NWWXybuC5gsZRxttBF2VutJlw3K+ps mw33B5xPkSq/v+xE14U/gVsPrktRfZvouEspmi/ztIQSS3FGoqEWc1FxIgBCHOEmDQIAAA== Subject: [AVTCORE] Reminder: Re: WG last call on draft-ietf-avtcore-6222bis-01 X-BeenThere: avt@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Audio/Video Transport Core Maintenance List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: Errors-To: avt-bounces@ietf.org Return-Path: avt-bounces@ietf.org X-MS-Exchange-Organization-AVStamp-Mailbox: MSFTFF;1;0;0 0 0 X-MS-Exchange-Organization-AuthSource: esessmw0191.eemea.ericsson.se X-MS-Exchange-Organization-AuthAs: Anonymous MIME-Version: 1.0 WG, So far there has be no other reviews of this document than mine. Can someone please review this document? I hereby extended the WG last call with one week until the 7th of April. Cheers Magnus On 2013-03-12 20:04, Magnus Westerlund wrote: > WG, >=20 > This is to announce the start of a WG last call on: >=20 > Guidelines for Choosing RTP Control Protocol (RTCP) Canonical Names > (CNAMEs) to be published as a proposed standard. >=20 > Document can be retrieved here: > https://datatracker.ietf.org/doc/draft-ietf-avtcore-6222bis/ >=20 > Please provide any feedback by the 31st of March. >=20 > Regards >=20 > Magnus Westerlund > WG chair >=20 >=20 > ---------------------------------------------------------------------- > Multimedia Technologies, Ericsson Research EAB/TVM > ---------------------------------------------------------------------- > Ericsson AB | Phone +46 10 7148287 > F=E4r=F6gatan 6 | Mobile +46 73 0949079 > SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com > ---------------------------------------------------------------------- >=20 > _______________________________________________ > Audio/Video Transport Core Maintenance > avt@ietf.org > https://www.ietf.org/mailman/listinfo/avt >=20 >=20 --=20 Magnus Westerlund ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 F=E4r=F6gatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- _______________________________________________ Audio/Video Transport Core Maintenance avt@ietf.org https://www.ietf.org/mailman/listinfo/avt --------------050906060904060507000001-- From magnus.westerlund@ericsson.com Tue Apr 2 02:09:15 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 30B5921F9864 for ; Tue, 2 Apr 2013 02:09:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.249 X-Spam-Level: X-Spam-Status: No, score=-106.249 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UbhYNbF2IHgh for ; Tue, 2 Apr 2013 02:09:14 -0700 (PDT) Received: from mailgw1.ericsson.se (mailgw1.ericsson.se [193.180.251.45]) by ietfa.amsl.com (Postfix) with ESMTP id B253621F8F53 for ; Tue, 2 Apr 2013 02:09:12 -0700 (PDT) X-AuditID: c1b4fb2d-b7f316d0000028db-2f-515aa037d309 Received: from esessmw0247.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw1.ericsson.se (Symantec Mail Security) with SMTP id 90.26.10459.730AA515; Tue, 2 Apr 2013 11:09:11 +0200 (CEST) Received: from [127.0.0.1] (153.88.115.8) by esessmw0247.eemea.ericsson.se (153.88.115.94) with Microsoft SMTP Server id 8.3.279.1; Tue, 2 Apr 2013 11:09:11 +0200 Message-ID: <515AA036.2020008@ericsson.com> Date: Tue, 2 Apr 2013 11:09:10 +0200 From: Magnus Westerlund User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130307 Thunderbird/17.0.4 MIME-Version: 1.0 To: Ted Hardie References: <51562335.1020409@acm.org> In-Reply-To: X-Enigmail-Version: 1.5.1 Content-Type: multipart/mixed; boundary="------------000008040605020406020804" X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrPLMWRmVeSWpSXmKPExsUyM+Jvra75gqhAg70nNC06JrNZrP3Xzm7R ONfOgdljyu+NrB47Z91l91iy5CdTAHMUl01Kak5mWWqRvl0CV8ayBS9ZCno28Vd0Ht3K3MB4 4SdfFyMnh4SAicTEIw/ZIGwxiQv31gPZXBxCAqcYJSY0vWaEcJYxSuw8cp8ZpIpXQFvi8/0W sA4WARWJw38+M4HYbAIWEjd/NILFRQWCJX6+OsMCUS8ocXLmEzBbREBZYu+VHWA1zAJ+Eq+X tgLZHBzCAmYSh2+wQOzawCgxp+0YK0gNp0CgxJopl1ghrpOU2PKinR2iN0Bi+u59YLYQ0D0N TR2sExgFZyFZNwtJGYRtIHFk0RxWCFteonnrbGaYmifv5kDZihJTuh9C1QdLXPm0mmUBI/sq RvbcxMyc9HLDTYzASDi45bfuDsZT50QOMUpzsCiJ84a5XggQEkhPLEnNTk0tSC2KLyrNSS0+ xMjEwSnVwGhsHO0eLMCfN0Pt+Hfd8p7s5X6ZB8+eia/ikzU4WsCaPl0xqCbvbu5z7Y7r7S1d DLcfRBYdW5Z8aoNDf/LPT5rLN91YdtglepNbWIr0wejk7pevuzI4lXjSVkrPZH/oV+fldduu 8IHdtSsdoW+1vKou6SnwTXxtMCGN1eSFy4Tcr+tDvr5ZqcRSnJFoqMVcVJwIALAxDZZSAgAA Cc: Cullen Jennings , "rtcweb@ietf.org" Subject: Re: [rtcweb] DRAFT minutes for RTCWEB day two X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 Apr 2013 09:09:15 -0000 --------------000008040605020406020804 Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 8bit WG, Attached is a version with change marks for a number of proposed changes where I think the minutes can benefit from clarification and details. I have one question mark where I don't understand what the minutes reefer to. In Cullen's video presentation the following sentence exist: Henning’s guideline on this was the guideline from the beginning. Can someone please clarify? Cheers Magnus On 2013-04-01 19:40, Ted Hardie wrote: > On Fri, Mar 29, 2013 at 4:26 PM, Marc Petit-Huguenin > wrote: > > On 03/29/2013 04:01 PM, Ted Hardie wrote: >> Attached are draft minutes for the second day of the RTCWEB > meetings at >> IETF 86, please review and send comments to the list. > > > I predict that a lot of people that are not familiar with the core > group of > RTCweb participants will read this minutes, so I would suggest to > check that > the first time a name appears in the minutes, it is the full name of the > person, not just the first name (and perhaps with the full name all > uppercase > so it is easier to find). E.g. in the first paragraph, "Martin" > should be > replaced by "Martin Thomson" or "MARTIN THOMSON". Same for "Giri", > "Gaelle", > "Daryl", "Kalyani", "Hadriel". > > >> Ok, I've added last names where I know them or could hear them on the >> recording. There are a few that remain unclear to me. Attached is the >> updated version; if folks could review it and give names where they know >> them, that would be useful. > >> thanks, > >> Ted > > > > > Thanks. > > > -- Magnus Westerlund ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- --------------000008040605020406020804 Content-Type: application/msword; name="RTCWEBMinutesIETF86Day2(1)-magnus.rtf" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="RTCWEBMinutesIETF86Day2(1)-magnus.rtf" e1xydGYxXGFkZWZsYW5nMTAyNVxhbnNpXGFuc2ljcGcxMjUyXHVjMVxhZGVmZjFcZGVmZjBc c3RzaGZkYmNoMFxzdHNoZmxvY2gwXHN0c2hmaGljaDBcc3RzaGZiaTBcZGVmbGFuZzEwMzNc 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MDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAw MDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAw MDAwMDAwMDAwMDAwMDBmZmZmZmZmZmZmZmZmZmZmZmZmZmZmZmYwMDAwMDAwMDAwMDAwMDAw MDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDANCjAwMDAwMDAwMDAwMDAwMDAwMDAw MDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAxMDUwMDAwMDAwMDAwMDB9fQ== --------------000008040605020406020804-- From fluffy@cisco.com Tue Apr 2 11:37:17 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CD85E21F8D8E for ; Tue, 2 Apr 2013 11:37:17 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.599 X-Spam-Level: X-Spam-Status: No, score=-110.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5eim+llhrxli for ; Tue, 2 Apr 2013 11:37:17 -0700 (PDT) Received: from rcdn-iport-5.cisco.com (rcdn-iport-5.cisco.com [173.37.86.76]) by ietfa.amsl.com (Postfix) with ESMTP id 23A0B21F8D8D for ; Tue, 2 Apr 2013 11:37:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=255; q=dns/txt; s=iport; t=1364927837; x=1366137437; h=from:to:subject:date:message-id:content-id: content-transfer-encoding:mime-version; bh=GzgnN4X1b8f00JxJ+MoE/y9fz0ryx6QbsQFONfVs65o=; b=cN6cAwBQFF+zv9YFMaaBM4t3YV5hj1QS7UNRvXJyFHnFWDPsuX8ZUY7X +f+gFzT/i0GtLfNtLRQsKeAjvdcU/+P9fEUQu0ujaKinZTcmRsfUtv3hY 5SL8y6NGM98v93Mcfvibqe5GNqjTNGyKyk8kV2pLhacrGSWNdg+j1CHAz Y=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AjkFAP8jW1GtJV2Y/2dsb2JhbABDgwc2glm8Z4EHFnSCIQEEOlEBKhRCJwQbiAwMoFyREpARBI5ogxdhA6d2gwuCKA X-IronPort-AV: E=Sophos;i="4.87,394,1363132800"; d="scan'208";a="194174677" Received: from rcdn-core-1.cisco.com ([173.37.93.152]) by rcdn-iport-5.cisco.com with ESMTP; 02 Apr 2013 18:37:16 +0000 Received: from xhc-rcd-x01.cisco.com (xhc-rcd-x01.cisco.com [173.37.183.75]) by rcdn-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id r32IbG5J013470 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Tue, 2 Apr 2013 18:37:16 GMT Received: from xmb-aln-x02.cisco.com ([169.254.5.155]) by xhc-rcd-x01.cisco.com ([173.37.183.75]) with mapi id 14.02.0318.004; Tue, 2 Apr 2013 13:37:16 -0500 From: "Cullen Jennings (fluffy)" To: "rtcweb@ietf.org" Thread-Topic: Use case for smellovision Thread-Index: AQHOL9EZnv3bvxwuvEiLzZKsubuFsA== Date: Tue, 2 Apr 2013 18:37:16 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.20.249.164] Content-Type: text/plain; charset="us-ascii" Content-ID: <4B4B343AD77A264589088079F82CFE20@emea.cisco.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: [rtcweb] Use case for smellovision X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 Apr 2013 18:37:17 -0000 I beilve everything I read on the web, even on April 1, and wanted to point= out that Googles new search,=20 https://www.google.com/intl/en/landing/nose/ Is going to be critical that webrtc support media types other than voice an= d video.=20 From oej@edvina.net Tue Apr 2 13:46:59 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0458421F8D3C for ; Tue, 2 Apr 2013 13:46:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id t7kdn8irgO-p for ; Tue, 2 Apr 2013 13:46:57 -0700 (PDT) Received: from smtp7.webway.se (smtp7.webway.se [IPv6:2a02:920:212e::205]) by ietfa.amsl.com (Postfix) with ESMTP id 713C721F8DD4 for ; Tue, 2 Apr 2013 13:46:56 -0700 (PDT) Received: from [192.168.40.5] (h87-96-134-129.dynamic.se.alltele.net [87.96.134.129]) by smtp7.webway.se (Postfix) with ESMTPA id D377593C1AF; Tue, 2 Apr 2013 20:46:44 +0000 (UTC) Content-Type: text/plain; charset=iso-8859-1 Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) From: "Olle E. Johansson" In-Reply-To: Date: Tue, 2 Apr 2013 22:46:24 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <8DFF2C41-FA67-4BB6-B4EB-784CEC2D0DFE@edvina.net> References: To: "Cullen Jennings (fluffy)" X-Mailer: Apple Mail (2.1503) Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] Use case for smellovision X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 Apr 2013 20:46:59 -0000 2 apr 2013 kl. 20:37 skrev "Cullen Jennings (fluffy)" = : >=20 > I beilve everything I read on the web, even on April 1, and wanted to = point out that Googles new search,=20 >=20 > https://www.google.com/intl/en/landing/nose/ >=20 > Is going to be critical that webrtc support media types other than = voice and video.=20 >=20 I do remember Patrik F=E4ltstr=F6m's first presentation of Internet = Media Types - MIME. He said that they had attachment types for everything except smell. Time to fix that, obviously. /O= From fluffy@cisco.com Wed Apr 3 05:08:58 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 977BD21F85F5 for ; Wed, 3 Apr 2013 05:08:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.599 X-Spam-Level: X-Spam-Status: No, score=-110.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zJii4HU8IIPX for ; Wed, 3 Apr 2013 05:08:58 -0700 (PDT) Received: from rcdn-iport-2.cisco.com (rcdn-iport-2.cisco.com [173.37.86.73]) by ietfa.amsl.com (Postfix) with ESMTP id 0797A21F85D8 for ; Wed, 3 Apr 2013 05:08:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=582; q=dns/txt; s=iport; t=1364990938; x=1366200538; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-id:content-transfer-encoding: mime-version; bh=nlruLa++fbWqGp3qx9NdKhZv3aIloqfuLMyiAP2g2/A=; b=QP9ZtzuqKXcONFitNoZVs3ENkiN9A3OZDpOaSBZFx78/kQkSMnqRxC2U LT52iI35npkxgeQPNodkAmgL8M/yg7hoXbxUgpQ/ZPwbdlhfabtFI7TMd l1uUThowPJMSTc0gtCqcE5SbTRy9k85YaQYqR2QXryysVgR94GOzzE2L1 E=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApIFAEwbXFGtJXHB/2dsb2JhbABDgweDE71igQsWdIIfAQEBAwF5BQsCAQgiJDIlAgQOBQiIBgbBCY5mAjEHgl9hA6d2gwuCKA X-IronPort-AV: E=Sophos;i="4.87,401,1363132800"; d="scan'208";a="194472148" Received: from rcdn-core2-6.cisco.com ([173.37.113.193]) by rcdn-iport-2.cisco.com with ESMTP; 03 Apr 2013 12:08:55 +0000 Received: from xhc-rcd-x14.cisco.com (xhc-rcd-x14.cisco.com [173.37.183.88]) by rcdn-core2-6.cisco.com (8.14.5/8.14.5) with ESMTP id r33C8s8M016815 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Wed, 3 Apr 2013 12:08:54 GMT Received: from xmb-aln-x02.cisco.com ([169.254.5.155]) by xhc-rcd-x14.cisco.com ([173.37.183.88]) with mapi id 14.02.0318.004; Wed, 3 Apr 2013 07:08:54 -0500 From: "Cullen Jennings (fluffy)" To: Magnus Westerlund Thread-Topic: [rtcweb] DRAFT minutes for RTCWEB day two Thread-Index: AQHOMGQCD8CkpKo6kkKr0qUnMc3++g== Date: Wed, 3 Apr 2013 12:08:53 +0000 Message-ID: References: <51562335.1020409@acm.org> <515AA036.2020008@ericsson.com> In-Reply-To: <515AA036.2020008@ericsson.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.20.249.164] Content-Type: text/plain; charset="Windows-1252" Content-ID: <4BD285BF4749C24B8B4B24FD15A25C4F@emea.cisco.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] DRAFT minutes for RTCWEB day two X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Apr 2013 12:08:58 -0000 On Apr 2, 2013, at 3:09 AM, Magnus Westerlund wrote: > WG, >=20 > Attached is a version with change marks for a number of proposed changes > where I think the minutes can benefit from clarification and details. >=20 > I have one question mark where I don't understand what the minutes > reefer to. In Cullen's video presentation the following sentence exist: >=20 > Henning=92s guideline on this was the guideline from the beginning. Did anyone actually say that in the meeting? Was it Ted because I don't rec= all saying that. From suhasietf@gmail.com Wed Apr 3 08:39:59 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0919B21F8F26 for ; Wed, 3 Apr 2013 08:39:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CH7IBmNUKEhI for ; Wed, 3 Apr 2013 08:39:58 -0700 (PDT) Received: from mail-wi0-x22e.google.com (mail-wi0-x22e.google.com [IPv6:2a00:1450:400c:c05::22e]) by ietfa.amsl.com (Postfix) with ESMTP id 3719021F8F24 for ; Wed, 3 Apr 2013 08:39:58 -0700 (PDT) Received: by mail-wi0-f174.google.com with SMTP id hj8so3772032wib.7 for ; Wed, 03 Apr 2013 08:39:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=s4zDZjW37wZNZ99jQsjF6BwqXVcrVZ8ynQRPuDtC0Rc=; b=EYn2l4ZgMVS+Dmk+3IkKjt2jxC5kVJwsKNY9ABoiZjLiA1b/FqhSEV612yblNip3As tOnRMdZNBtSptEThnkbEMxFhVHlMCSyg7L5IIvpbc7idZ9tTrOMFFo72QbxPF7ewmbVS rO7H2MncCNrVMqiuKDlNRfI5dYkvK9gjJ8N2RCAq+rtPWmm3FE6PMEAceVhtN3pnS2BD oa16j1Oa3eXQiNQhhpyOnuqre23HfQiuW7Jn5hLXRu8EXkEVg0qi84cglnJ9SP+H0G99 nQdJkW0AW7zpxrF0TOlDOt9AnVdt67FIYWqG1PEXCLJi/J7N9h+yimQ4zWw6RBxPxDa2 02RQ== MIME-Version: 1.0 X-Received: by 10.180.85.103 with SMTP id g7mr23525709wiz.23.1365003597268; Wed, 03 Apr 2013 08:39:57 -0700 (PDT) Received: by 10.194.16.170 with HTTP; Wed, 3 Apr 2013 08:39:57 -0700 (PDT) In-Reply-To: <8DFF2C41-FA67-4BB6-B4EB-784CEC2D0DFE@edvina.net> References: <8DFF2C41-FA67-4BB6-B4EB-784CEC2D0DFE@edvina.net> Date: Wed, 3 Apr 2013 08:39:57 -0700 Message-ID: From: Suhas Nandakumar To: "Olle E. Johansson" Content-Type: multipart/alternative; boundary=f46d043bdce6884c4c04d976aaf6 Cc: "Cullen Jennings \(fluffy\)" , "rtcweb@ietf.org" Subject: Re: [rtcweb] Use case for smellovision X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Apr 2013 15:39:59 -0000 --f46d043bdce6884c4c04d976aaf6 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable I think such an application can be embedded in the rtcweb-sensors attached to the sniff dogs for real-time big data analysis of smell and hence help solve the crime - world peace On Tuesday, April 2, 2013, Olle E. Johansson wrote: > > 2 apr 2013 kl. 20:37 skrev "Cullen Jennings (fluffy)" > >: > > > > > I beilve everything I read on the web, even on April 1, and wanted to > point out that Googles new search, > > > > https://www.google.com/intl/en/landing/nose/ > > > > Is going to be critical that webrtc support media types other than voic= e > and video. > > > I do remember Patrik F=E4ltstr=F6m's first presentation of Internet Media > Types - MIME. > He said that they had attachment types for everything except smell. > > Time to fix that, obviously. > > /O > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > --f46d043bdce6884c4c04d976aaf6 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable I think such an application can be embedded in the=A0rtcweb-se= nsors attached to the=A0sniff dogs for real-time big data analysis of smell= and hence help solve the crime - =A0world peace

On Tuesday, April 2= , 2013, Olle E. Johansson wrote:

2 apr 2013 kl. 20:37 skrev "Cullen Jennings (fluffy)" <fluffy@cisco.com>:

>
> I beilve everything I read on the web, even on April 1, and wanted to = point out that Googles new search,
>
> https://www.google.com/intl/en/landing/nose/
>
> Is going to be critical that webrtc support media types other than voi= ce and video.
>
I do remember Patrik F=E4ltstr=F6m's first presentation of Internet Med= ia Types - MIME.
He said that they had attachment types for everything except smell.

Time to fix that, obviously.

/O
_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
= https://www.ietf.org/mailman/listinfo/rtcweb
--f46d043bdce6884c4c04d976aaf6-- From pthatcher@google.com Wed Apr 3 09:06:27 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8807121F8C9A for ; Wed, 3 Apr 2013 09:06:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -101.977 X-Spam-Level: X-Spam-Status: No, score=-101.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pwpyINEAm79x for ; Wed, 3 Apr 2013 09:06:27 -0700 (PDT) Received: from mail-pd0-f181.google.com (mail-pd0-f181.google.com [209.85.192.181]) by ietfa.amsl.com (Postfix) with ESMTP id EABCD21F8C08 for ; Wed, 3 Apr 2013 09:06:26 -0700 (PDT) Received: by mail-pd0-f181.google.com with SMTP id y10so929006pdj.12 for ; Wed, 03 Apr 2013 09:06:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=DZDyF11f58Xt+0s3yWrHqyWsedizVtrasjJaT7R7Y6k=; b=fueNLc7OQhLg7z8ijwcIIowOVEDICnOIGibNpGqhbduTJHHPfFJACLhOUT7fgIBy9A FysAfIKaqSJwoUrnq5WU9YQ87MXkp3E6GnyCB0i0VspC4oO1vKfQVfPR64N/5ilE2J4T 6HfLmIJf0ab0Ij/0vJ0r172rvdKHUpq0y9vGvN/LqK/XPFEgIihrRsyt1SiYXVn8TYj6 Vm+G5VCPzJy7SrZSFSKb4FzyECnLidX3rNkYrupMTUPl8MzQUnEJ19icqkJ0j+z/qaEM M2bXGY4/reRXanYxM33nhJ+cAHJBxaixLj1lX6W8zycre392FFIPuOVC5wTUeb1/QyaD FD9A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:x-gm-message-state; bh=DZDyF11f58Xt+0s3yWrHqyWsedizVtrasjJaT7R7Y6k=; b=ArvNjVaqfmDJ4E/lh/5JchHXX4Jn8R1MiVWuYnPx0IcV7biCUzVVVg3xZywXyuQTcW MGVNHqRUEqXp3RJmwWR85o6B6dM7X/xFWi1tsqc8c+UjXVMS0Ubiy1qeFOSfksRqFJZp 3qRfbzw4kh2Ms0j8Z2SPmcfSc/58HpM7yX+Gz4V/4wW3/2hFILgtsoZjLgoPOebRrAPv 9rCUtlJmOjEQTxi5ZHR10RXvgmLlXhfBc2ym4UGIIHnzYNXAbQ++BDh0USJlyBH0FvYO P7n2pENA2iiRu+jCbMXM8MZdjHH2YZqsWxX/WblanGLgDgva8hGmd9gxDHa8D0K/ZJTU RxVA== X-Received: by 10.66.138.101 with SMTP id qp5mr4031703pab.127.1365005186621; Wed, 03 Apr 2013 09:06:26 -0700 (PDT) MIME-Version: 1.0 Received: by 10.66.248.196 with HTTP; Wed, 3 Apr 2013 09:05:46 -0700 (PDT) In-Reply-To: References: <5158F0FC.3070104@jesup.org> <5159E6F9.4070808@jesup.org> From: Peter Thatcher Date: Wed, 3 Apr 2013 09:05:46 -0700 Message-ID: To: Martin Thomson Content-Type: text/plain; charset=UTF-8 X-Gm-Message-State: ALoCoQnBrfSR3oKJDjhZ58plkS/A/cAfVm5CNnjXTLNhSl2/7az6eWXPCU0o7WzmKpagIhvTgqPCpBhOsg28ddo6iTwodRGXnZxoibClDFeqGZKLAouFDla80TFpuO9caf4LJZ5ezpTCWyEDKN5owSZBbrkP5bnn+dEYYdU69Yy+Maz/eJN2qSJiIbPc7mYtAXeNJGzJm/4j Cc: Randell Jesup , "rtcweb@ietf.org" , "public-webrtc@w3.org" Subject: Re: [rtcweb] DataChannels API and external negotiation X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Apr 2013 16:06:27 -0000 I think moving protocol into the dictionary is a good idea. In fact, I'd like to see label move there as well, but that's probably asking too much. And now for a little of my own bikeshedding: I don't understand way we have "stream" and "preset", since you can only set "stream" if "preset" is true. Why not just make the rule "if stream is set, no in-band message is sent", and get rid of "preset" altogether? I really don't like the word "stream" sneaking in, since it's so overloaded (MediaStream, RTP Stream, etc). I'd prefer "sid" or just "id". I like the idea that reliable+ordered is the default, and both reliability and ordered can be set independently. I also prefer "ordered" over "outOfOrderAllowed", and along with that I like the idea of a "reliable" flag that, if false, is the equivalent of either maxRetransmitNum:0 or maxRetransmitTime:0. Finally, I think "maxRetransmitTime" should make its units clear, perhaps calling it "maxRetransmitMillis", and "maxRetransmitNum" could be shortened to simply "maxRetransmits". So the dictionary for my bikeshed would be: dictionary DataChannelInit { DOMString protocol; unsigned short id; boolean ordered; boolean reliable; unsigned short maxRetransmits; unsigned short maxRetransmitMillis; }; On Mon, Apr 1, 2013 at 1:24 PM, Martin Thomson wrote: > On 1 April 2013 12:58, Randell Jesup wrote: >> I don't know that removing 'max' helps here or hurts. Also, sorta-acronyms >> like rtx are obvious to networking people; not so much to JS app developers. >> I see only minimal advantage here to brevity. Count might be an improvement >> on Num. > > Yeah, 'rtx' is probably too aggressively short. > >>> 'preset' doesn't sound right, maybe you could have 'inlineOpen' >>> (default: true) to convey what is really happening here. >> >> >> externallyNegotiated (default: false)? Not great, but "inlineOpen" will be >> pretty meaningless to most developers who probably could care less if >> there's an in-band open message for a channel (whether externally negotiated >> or not) - or even know there's an in-band message. Then again, 99% of >> developers don't need to care about this anyways. > > Yes, I didn't get a warm fuzzy from my suggested name either, but you > are right about the impact being relatively low. > > Other ideas: "announceSettings" (default: true), "prearranged" > (default: false), "thisIsNotATest" (default: "yesItIs"). > >> Unsigned short has been the type in the protocol fields since the first >> draft (like a year). Perhaps a silly optimization, though I think if you >> want partial reliability with >64K resends, or >64 seconds of retry that you >> *really* want reliable transmission (perhaps unordered, but reliable). If >> we want to change it, now's the time, since we're breaking binary >> compatibility in FF with my landing today anyways. > > Well, you'll be accepting a JS number, so it doesn't really matter > what the spec says. > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From agrange@google.com Wed Apr 3 09:20:08 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DE90D21F8E4C for ; Wed, 3 Apr 2013 09:20:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -101.977 X-Spam-Level: X-Spam-Status: No, score=-101.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vdrT1Hy4q-8H for ; Wed, 3 Apr 2013 09:20:04 -0700 (PDT) Received: from mail-ia0-x234.google.com (mail-ia0-x234.google.com [IPv6:2607:f8b0:4001:c02::234]) by ietfa.amsl.com (Postfix) with ESMTP id D20D921F8DDD for ; Wed, 3 Apr 2013 09:20:03 -0700 (PDT) Received: by mail-ia0-f180.google.com with SMTP id f27so1410084iae.39 for ; Wed, 03 Apr 2013 09:20:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:x-received:date:message-id:subject:from:to :content-type; bh=cTNu99XWsP5kBLbTSgjOS1M4bctF8VwZA239LjO6eDM=; b=Zkdpmgs7Mp1gXJ7qAkRmYB+TTQvkxRKIrXAYBu1YCpw1qd48INYsczTw20/s6OKc79 bL/9oGn2fZtxaSM5u1O3QnZgpjKoJs0Dswg1wUviaOqRibL9AOp4rVye0AIQttBmY92V YGd0ZcWiOgdMgjSA57o9wt+JczI4GxmFoY5Rl0mYtHlAXKNK0kMHwaijWSQFz/0T4fHb 2BDRanxucvpTCkJGQmfTkJi1VCKAa4t/doWbM4w5A9wYnUnfOyhhkz/drgEJiZvHjG5t gt1Yd+l7Yhztm3Cemk6NSwNEJ5TxwG3cmU1nHHsmN5UxODDIYBoTAFWUbVjBrfsgdzon idDQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:x-received:date:message-id:subject:from:to :content-type:x-gm-message-state; bh=cTNu99XWsP5kBLbTSgjOS1M4bctF8VwZA239LjO6eDM=; b=IucH7xCrmD9Bl3aNnBm2/2mjUUCID1FHAMpBTQJ/TlB+z6gq5Sp68048jERFMEcSJd sB7fGTn2E/goOYjffJ7bvp5aTBNp9ApED0w4J+D0C1y68ugfOSNBbGYVKw/iOCaeJpRT JxgWfCyb6Hba8yRuHgHr+tTG7xibZg5nDbZoLkEe9PJNy/Sj1F4n6mcnA8i198WUepY9 n0n3OXUjvOCDtZQbv0wjh3pAgodFZ3OI3iiHGrh2sU1LqPKY7xdJdaWFlw9+CRX7x4HV CTeTPP1MwsOeezWhubM/hW++XVfHKITAqDvGQjnzqgyrvsBL178h+5fhJsf1gFJvvSJr qOyw== MIME-Version: 1.0 X-Received: by 10.50.93.3 with SMTP id cq3mr1494644igb.70.1365006003415; Wed, 03 Apr 2013 09:20:03 -0700 (PDT) Received: by 10.64.76.80 with HTTP; Wed, 3 Apr 2013 09:20:03 -0700 (PDT) Date: Wed, 3 Apr 2013 09:20:03 -0700 Message-ID: From: Adrian Grange To: rtcweb@ietf.org Content-Type: multipart/alternative; boundary=047d7b2e3e00f33e3a04d9773920 X-Gm-Message-State: ALoCoQnNsbLCkD/UB+q7uY1NNKdi3zgEUysrWu5CQkyu0VqSwnuQtRzbeoLX+fgQzsi+ki/tDfQOxeGNhxriMe7sdDwTfCQwpNLTgqPcxEV4jcBkKnzJx9dZp2IjcF2X5W2VlFUnTuR1hyqX7iH8j+HiJs11ToYlFjKIi29490FBInnkpkmAYOPm3YLvXPs4icSynnDz9E4H Subject: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Apr 2013 16:20:09 -0000 --047d7b2e3e00f33e3a04d9773920 Content-Type: text/plain; charset=ISO-8859-1 We have uploaded a new set of test results comparing VP8 to H.264. This latest set contains fixes for some of the problems in the previous set. We would like to extend our thanks to those who made suggestions as to how we could improve our methodology and encourage suggestions as to how we can make further improvements. In these tests we run x264 with the "veryslow" preset and VP8 with the "good, speed 0" setting in an attempt to produce comparable results. An overview of our results is available as follows: - A Quality comparison (psnr): http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_quality.html - An Encode Speed comparison: http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_speed.html - A comparison of the aggregate time required to decode all of the clips in the test: http://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt All of our test scripts can either be downloaded from: http://downloads.webmproject.org/ietf_tests/vp8_vs_h264.tar.xz or checked out of our git/gerrit repository: git clone http://git.chromium.org/webm/vpx_codec_comparison.git The file README.txt, contained within, presents details of how to build and run the tests. The compressed video files--the output from the quality tests--can also be downloaded: VP8: http://downloads.webmproject.org/ietf_tests/vp8_videos/index.html H.264: http://downloads.webmproject.org/ietf_tests/h264_videos/index.html Adrian Grange --047d7b2e3e00f33e3a04d9773920 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
We have uploaded a new set of test results comparing VP8 t= o H.264. This latest set contains fixes for some of the problems in the pre= vious set. We would like to extend our thanks to those who made suggestions= as to how we could improve our methodology and encourage suggestions as to= how we can make further improvements.

In these tests we run x264 with the "veryslo= w" preset and VP8 with the "good, speed 0" setting in an att= empt to produce comparable results.

An overview of our results is available as follows:

- A Quality comparison (psnr):=A0http://downloads.webmproject.org/ietf_tests/vp8_vs_h2= 64_quality.html


- A comparison of the = aggregate time required to decode all of the clips in the test:=A0http://downloads.webmproject.org/ietf_tests/vp8vsh264-deco= detime.txt

All of our test scripts=A0can either be download= ed from:
or checked out of our git/gerrit repository:
=
The file README.txt, contained within, presents details of how to build= and run the tests.

Th= e compressed video files--the output from the quality tests--can also be do= wnloaded:



--047d7b2e3e00f33e3a04d9773920-- From randell-ietf@jesup.org Wed Apr 3 09:21:02 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D75C121F8EB4 for ; Wed, 3 Apr 2013 09:21:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.949 X-Spam-Level: X-Spam-Status: No, score=-1.949 tagged_above=-999 required=5 tests=[AWL=0.650, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dqQxNc349xyY for ; Wed, 3 Apr 2013 09:21:01 -0700 (PDT) Received: from r2-chicago.webserversystems.com (r2-chicago.webserversystems.com [173.236.101.58]) by ietfa.amsl.com (Postfix) with ESMTP id 9D0C321F8DDD for ; Wed, 3 Apr 2013 09:21:01 -0700 (PDT) Received: from pool-98-111-140-34.phlapa.fios.verizon.net ([98.111.140.34]:1042 helo=[192.168.1.12]) by r2-chicago.webserversystems.com with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.80) (envelope-from ) id 1UNQQm-000E8T-ST for rtcweb@ietf.org; Wed, 03 Apr 2013 11:21:01 -0500 Message-ID: <515C5688.4070004@jesup.org> Date: Wed, 03 Apr 2013 12:19:20 -0400 From: Randell Jesup User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130307 Thunderbird/17.0.4 MIME-Version: 1.0 To: rtcweb@ietf.org References: <5158F0FC.3070104@jesup.org> <5159E6F9.4070808@jesup.org> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - r2-chicago.webserversystems.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - jesup.org Subject: Re: [rtcweb] DataChannels API and external negotiation X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Apr 2013 16:21:03 -0000 On 4/3/2013 12:05 PM, Peter Thatcher wrote: > I think moving protocol into the dictionary is a good idea. In fact, > I'd like to see label move there as well, but that's probably asking > too much. > > And now for a little of my own bikeshedding: > > I don't understand way we have "stream" and "preset", since you can > only set "stream" if "preset" is true. Why not just make the rule "if > stream is set, no in-band message is sent", and get rid of "preset" > altogether? I really don't like the word "stream" sneaking in, since > it's so overloaded (MediaStream, RTP Stream, etc). I'd prefer "sid" > or just "id". The reason was that I wanted a way to have the system select a stream to use (that you can then communicate externally to the other side); this avoids any chance of a collision with existing streams. If this is seen as not useful, then we can collapse it to a single entry. (I also toyed with using stream 65535 as a flag to tell the system to allocate one; that seemed too hacky.) Since this option was almost solely for those who understand the underlying SCTP-ness of this, I used "stream", but I'm fine with "streamId" or "id" (or "index" might be better than "id", which sounds like a label of some sort). I dislike "sid" for similar reasons to disliking "rtx". > I like the idea that reliable+ordered is the default, and both > reliability and ordered can be set independently. I also prefer > "ordered" over "outOfOrderAllowed", and along with that I like the > idea of a "reliable" flag that, if false, is the equivalent of either > maxRetransmitNum:0 or maxRetransmitTime:0. Finally, I think > "maxRetransmitTime" should make its units clear, perhaps calling it > "maxRetransmitMillis", and "maxRetransmitNum" could be shortened to > simply "maxRetransmits". Those seem reasonable (I'd use Millisec/MilliSec or perhaps MS instead of Millis -- how are millisecond time values in other HTML5 specs described?). On "reliable:false" - is this just a shorthand for "ordered:false, maxRetransmits:0"? If so, I'm probably ok with it - it's redundant, but makes it easy to use/read for a common case. > > So the dictionary for my bikeshed would be: > > dictionary DataChannelInit { > DOMString protocol; > unsigned short id; > boolean ordered; > boolean reliable; > unsigned short maxRetransmits; > unsigned short maxRetransmitMillis; > }; -- Randell Jesup randell-ietf@jesup.org From randell-ietf@jesup.org Wed Apr 3 09:23:05 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DDCC821F8F03 for ; Wed, 3 Apr 2013 09:23:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.166 X-Spam-Level: X-Spam-Status: No, score=-2.166 tagged_above=-999 required=5 tests=[AWL=0.433, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1FqRl317kF9u for ; Wed, 3 Apr 2013 09:23:00 -0700 (PDT) Received: from r2-chicago.webserversystems.com (r2-chicago.webserversystems.com [173.236.101.58]) by ietfa.amsl.com (Postfix) with ESMTP id 5AA8521F8EFD for ; Wed, 3 Apr 2013 09:22:54 -0700 (PDT) Received: from pool-98-111-140-34.phlapa.fios.verizon.net ([98.111.140.34]:1043 helo=[192.168.1.12]) by r2-chicago.webserversystems.com with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.80) (envelope-from ) id 1UNQSb-000Euo-Bn; Wed, 03 Apr 2013 11:22:53 -0500 Message-ID: <515C56F6.8070308@jesup.org> Date: Wed, 03 Apr 2013 12:21:10 -0400 From: Randell Jesup User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130307 Thunderbird/17.0.4 MIME-Version: 1.0 To: rtcweb@ietf.org, "public-webrtc@w3.org" References: <5158F0FC.3070104@jesup.org> <5159E6F9.4070808@jesup.org> <515C5688.4070004@jesup.org> In-Reply-To: <515C5688.4070004@jesup.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - r2-chicago.webserversystems.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - jesup.org Subject: Re: [rtcweb] DataChannels API and external negotiation X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Apr 2013 16:23:08 -0000 Adding W3 list back ("Reply List" replies to one list in TB), since this really is a W3 item anyways. On 4/3/2013 12:19 PM, Randell Jesup wrote: > On 4/3/2013 12:05 PM, Peter Thatcher wrote: >> I think moving protocol into the dictionary is a good idea. In fact, >> I'd like to see label move there as well, but that's probably asking >> too much. >> >> And now for a little of my own bikeshedding: >> >> I don't understand way we have "stream" and "preset", since you can >> only set "stream" if "preset" is true. Why not just make the rule "if >> stream is set, no in-band message is sent", and get rid of "preset" >> altogether? I really don't like the word "stream" sneaking in, since >> it's so overloaded (MediaStream, RTP Stream, etc). I'd prefer "sid" >> or just "id". > > The reason was that I wanted a way to have the system select a stream > to use (that you can then communicate externally to the other side); > this avoids any chance of a collision with existing streams. If this > is seen as not useful, then we can collapse it to a single entry. (I > also toyed with using stream 65535 as a flag to tell the system to > allocate one; that seemed too hacky.) > > Since this option was almost solely for those who understand the > underlying SCTP-ness of this, I used "stream", but I'm fine with > "streamId" or "id" (or "index" might be better than "id", which sounds > like a label of some sort). I dislike "sid" for similar reasons to > disliking "rtx". > >> I like the idea that reliable+ordered is the default, and both >> reliability and ordered can be set independently. I also prefer >> "ordered" over "outOfOrderAllowed", and along with that I like the >> idea of a "reliable" flag that, if false, is the equivalent of either >> maxRetransmitNum:0 or maxRetransmitTime:0. Finally, I think >> "maxRetransmitTime" should make its units clear, perhaps calling it >> "maxRetransmitMillis", and "maxRetransmitNum" could be shortened to >> simply "maxRetransmits". > > Those seem reasonable (I'd use Millisec/MilliSec or perhaps MS instead > of Millis -- how are millisecond time values in other HTML5 specs > described?). On "reliable:false" - is this just a shorthand for > "ordered:false, maxRetransmits:0"? If so, I'm probably ok with it - > it's redundant, but makes it easy to use/read for a common case. > >> >> So the dictionary for my bikeshed would be: >> >> dictionary DataChannelInit { >> DOMString protocol; >> unsigned short id; >> boolean ordered; >> boolean reliable; >> unsigned short maxRetransmits; >> unsigned short maxRetransmitMillis; >> }; > -- Randell Jesup randell-ietf@jesup.org From ted.ietf@gmail.com Wed Apr 3 09:28:34 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 266CC21F8E48 for ; Wed, 3 Apr 2013 09:28:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Mnw5ElHRqcRO for ; Wed, 3 Apr 2013 09:28:33 -0700 (PDT) Received: from mail-ie0-x236.google.com (mail-ie0-x236.google.com [IPv6:2607:f8b0:4001:c03::236]) by ietfa.amsl.com (Postfix) with ESMTP id 90F4921F8DBB for ; Wed, 3 Apr 2013 09:28:31 -0700 (PDT) Received: by mail-ie0-f182.google.com with SMTP id at1so1885700iec.41 for ; Wed, 03 Apr 2013 09:28:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=BmzDxNmPJBvfDtdMzPkwoPGYeCiqqfHSTbAvXLf2Ayo=; b=r9khHdLoTIVBfesqRGRi5lILLTKWNyw6tketJzHLQt9fV1mVOiq6hnTrAvv6hMc6WG ohQ3/Q24BXEvqYRhMTrqMSnFMLhwrKF2agOHC5OjJv73T5nlAbFrtgbF1+LPus+K04rD uxPP7OwwABP5MHz2cIhToU1FKPSOhAtkiDmWTB1zf6AFcnVlAh7b2yvhBm8EGu/7CJSb XYRH0nM+jvl7bo6SUSGHhEyHFKTQvC6DYe6cXzJ1iHWy7a1ioOUD1YfRnMKcv/uhmv2M lj0OupUXr4t/X/HWnL1FJnngpIXJ0eaumNh6nS9CkF0nL4Bh4freFU9h7CIC3yz30BhL uZkw== MIME-Version: 1.0 X-Received: by 10.50.27.10 with SMTP id p10mr302301igg.20.1365006503006; Wed, 03 Apr 2013 09:28:23 -0700 (PDT) Received: by 10.43.135.202 with HTTP; Wed, 3 Apr 2013 09:28:22 -0700 (PDT) In-Reply-To: References: <51562335.1020409@acm.org> <515AA036.2020008@ericsson.com> Date: Wed, 3 Apr 2013 09:28:22 -0700 Message-ID: From: Ted Hardie To: "Cullen Jennings (fluffy)" Content-Type: multipart/alternative; boundary=047d7b10cd29baba3104d97757e1 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] DRAFT minutes for RTCWEB day two X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Apr 2013 16:28:34 -0000 --047d7b10cd29baba3104d97757e1 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On Wed, Apr 3, 2013 at 5:08 AM, Cullen Jennings (fluffy) wrote: > > On Apr 2, 2013, at 3:09 AM, Magnus Westerlund < > magnus.westerlund@ericsson.com> wrote: > > > WG, > > > > Attached is a version with change marks for a number of proposed change= s > > where I think the minutes can benefit from clarification and details. > > > > I have one question mark where I don't understand what the minutes > > reefer to. In Cullen's video presentation the following sentence exist: > > > > Henning=92s guideline on this was the guideline from the beginning. > > Henning's guideline is approximately "the point of mandatory to implement anything is to avoid negotiation failure". > Did anyone actually say that in the meeting? Was it Ted because I don't > recall saying that. > > Yes, as the minutes note, I said it at the floor mic during our discussion of whether we should test the MTI as proposed or treat the MTI as a guideline on what approach would be commonly implemented and test at some other level. Ted --047d7b10cd29baba3104d97757e1 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On Wed, Apr 3, 2013 at 5:08 AM, Cullen Jennings (fluffy) = <fluffy@cisco.com<= /a>> wrote:

On Apr 2, 2013, at 3:09 AM, Magnus Westerlund <magnus.westerlund@ericsson.com> wrote:

> WG,
>
> Attached is a version with change marks for a number of proposed chang= es
> where I think the minutes can benefit from clarification and details.<= br> >
> I have one question mark where I don't understand what the minutes=
> reefer to. In Cullen's video presentation the following sentence e= xist:
>
> Henning=92s guideline on this was the guideline from the beginning.

Henning's guideline is approximately &q= uot;the point of mandatory to implement anything is to avoid negotiation fa= ilure".
=A0
Did anyone actually say that in the meeting? Was it Ted because I don= 't recall saying that.


Yes, as the minutes note, I said it at the floor mic= during our discussion of whether we should test=A0 the MTI as proposed or = treat the MTI as a guideline on what approach would be commonly implemented= and test at some other level.

Ted
--047d7b10cd29baba3104d97757e1-- From richard@shockey.us Wed Apr 3 09:38:43 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 80BF921F8A74 for ; Wed, 3 Apr 2013 09:38:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.264 X-Spam-Level: X-Spam-Status: No, score=-102.264 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, IP_NOT_FRIENDLY=0.334, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TdnFaeTE0GQO for ; Wed, 3 Apr 2013 09:38:42 -0700 (PDT) Received: from oproxy6-pub.bluehost.com (oproxy6-pub.bluehost.com [67.222.54.6]) by ietfa.amsl.com (Postfix) with SMTP id BBF3821F8BF2 for ; Wed, 3 Apr 2013 09:38:42 -0700 (PDT) Received: (qmail 17448 invoked by uid 0); 3 Apr 2013 16:38:15 -0000 Received: from unknown (HELO box462.bluehost.com) (74.220.219.62) by cpoproxy3.bluehost.com with SMTP; 3 Apr 2013 16:38:15 -0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=shockey.us; s=default; h=Content-Type:MIME-Version:Message-ID:Date:Subject:In-Reply-To:References:To:From; bh=RYfiq3g+2E26GXhQoNVfrrvnbEt11etFDq0HPT0l7tc=; b=CRed5NslF0VX3HdW9CkITfhphzDESkGdp+YiyT7tZHWrSdXaOXZL5TAiy5E1vcS8eW2guSRWC3YW4iF/WUSZGvk8WhR7UIzBhR7f/LOy95bjoSdLFoq746zfSGho+QlV; Received: from [72.66.111.101] (port=49337 helo=RSHOCKEYPC) by box462.bluehost.com with esmtpa (Exim 4.80) (envelope-from ) id 1UNQhS-0008H3-VY; Wed, 03 Apr 2013 10:38:15 -0600 From: "Richard Shockey" To: "'Cullen Jennings \(fluffy\)'" , References: <8DFF2C41-FA67-4BB6-B4EB-784CEC2D0DFE@edvina.net> In-Reply-To: Date: Wed, 3 Apr 2013 12:38:13 -0400 Message-ID: <002b01ce3089$a36a0450$ea3e0cf0$@shockey.us> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002C_01CE3068.1C586450" X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQMZA/WtqXM0nfkk28p/wFn4bQdsmwI0G31fAVSHb86WEsXH4A== Content-Language: en-us X-Identified-User: {3286:box462.bluehost.com:shockeyu:shockey.us} {sentby:smtp auth 72.66.111.101 authed with richard@shockey.us} Subject: Re: [rtcweb] Use case for smellovision X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Apr 2013 16:38:43 -0000 This is a multipart message in MIME format. ------=_NextPart_000_002C_01CE3068.1C586450 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable =20 What are the Intellectual Property Issues with smell-0-vision? Is there = a patent pool here?=20 =20 Obviously you need to find out that first before you can define a use = case. =20 =20 =20 From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf = Of Suhas Nandakumar Sent: Wednesday, April 03, 2013 11:40 AM To: Olle E. Johansson Cc: Cullen Jennings (fluffy); rtcweb@ietf.org Subject: Re: [rtcweb] Use case for smellovision =20 I think such an application can be embedded in the rtcweb-sensors = attached to the sniff dogs for real-time big data analysis of smell and hence = help solve the crime - world peace On Tuesday, April 2, 2013, Olle E. Johansson wrote: 2 apr 2013 kl. 20:37 skrev "Cullen Jennings (fluffy)" >: > > I beilve everything I read on the web, even on April 1, and wanted to point out that Googles new search, > > https://www.google.com/intl/en/landing/nose/ > > Is going to be critical that webrtc support media types other than = voice and video. > I do remember Patrik F=E4ltstr=F6m's first presentation of Internet = Media Types - MIME. He said that they had attachment types for everything except smell. Time to fix that, obviously. /O _______________________________________________ rtcweb mailing list rtcweb@ietf.org =20 https://www.ietf.org/mailman/listinfo/rtcweb ------=_NextPart_000_002C_01CE3068.1C586450 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

 

What are the Intellectual Property Issues with smell-0-vision?=A0 Is = there a patent pool here?

 

Obviously you need to find out that first before you can define a use = case.

 

 

 

From: = rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of = Suhas Nandakumar
Sent: Wednesday, April 03, 2013 11:40 = AM
To: Olle E. Johansson
Cc: Cullen Jennings = (fluffy); rtcweb@ietf.org
Subject: Re: [rtcweb] Use case for = smellovision

 

I think such = an application can be embedded in the rtcweb-sensors attached to = the sniff dogs for real-time big data analysis of smell and hence = help solve the crime -  world peace

On Tuesday, April 2, = 2013, Olle E. Johansson wrote:


2 apr = 2013 kl. 20:37 skrev "Cullen Jennings (fluffy)" <fluffy@cisco.com>:

>
> I = beilve everything I read on the web, even on April 1, and wanted to = point out that Googles new search,
>
> https://www.google.com/intl/en/landing/nose/
>= ;
> Is going to be critical that webrtc support media types other = than voice and video.
>
I do remember Patrik F=E4ltstr=F6m's = first presentation of Internet Media Types - MIME.
He said that they = had attachment types for everything except smell.

Time to fix = that, = obviously.

/O
_______________________________________________rtcweb mailing list
rtcweb@ietf.org
https://www.ietf.org/mailman/listinfo/rtcweb

------=_NextPart_000_002C_01CE3068.1C586450-- From Michael.Tuexen@lurchi.franken.de Wed Apr 3 11:16:28 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DC85421F8D11 for ; Wed, 3 Apr 2013 11:16:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.799 X-Spam-Level: X-Spam-Status: No, score=-0.799 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, J_CHICKENPOX_74=0.6, J_CHICKENPOX_75=0.6, J_CHICKENPOX_84=0.6] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ukbDavOLa-CK for ; Wed, 3 Apr 2013 11:16:28 -0700 (PDT) Received: from mail-n.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) by ietfa.amsl.com (Postfix) with ESMTP id 0FC8621F8CF0 for ; Wed, 3 Apr 2013 11:16:27 -0700 (PDT) Received: from [192.168.1.102] (p508FA1D6.dip.t-dialin.net [80.143.161.214]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTP id 1CB161C0C0BF5; Wed, 3 Apr 2013 20:16:25 +0200 (CEST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=us-ascii From: Michael Tuexen In-Reply-To: <515C5688.4070004@jesup.org> Date: Wed, 3 Apr 2013 20:16:24 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <3A34089E-2F7A-473D-A76E-0BF28A50035A@lurchi.franken.de> References: <5158F0FC.3070104@jesup.org> <5159E6F9.4070808@jesup.org> <515C5688.4070004@jesup.org> To: Randell Jesup X-Mailer: Apple Mail (2.1283) Cc: rtcweb@ietf.org Subject: Re: [rtcweb] DataChannels API and external negotiation X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Apr 2013 18:16:29 -0000 On Apr 3, 2013, at 6:19 PM, Randell Jesup wrote: > On 4/3/2013 12:05 PM, Peter Thatcher wrote: >> I think moving protocol into the dictionary is a good idea. In = fact, >> I'd like to see label move there as well, but that's probably asking >> too much. >>=20 >> And now for a little of my own bikeshedding: >>=20 >> I don't understand way we have "stream" and "preset", since you can >> only set "stream" if "preset" is true. Why not just make the rule = "if >> stream is set, no in-band message is sent", and get rid of "preset" >> altogether? I really don't like the word "stream" sneaking in, since >> it's so overloaded (MediaStream, RTP Stream, etc). I'd prefer "sid" >> or just "id". >=20 > The reason was that I wanted a way to have the system select a stream = to use (that you can then communicate externally to the other side); = this avoids any chance of a collision with existing streams. If this is = seen as not useful, then we can collapse it to a single entry. (I also = toyed with using stream 65535 as a flag to tell the system to allocate = one; that seemed too hacky.) >=20 > Since this option was almost solely for those who understand the = underlying SCTP-ness of this, I used "stream", but I'm fine with = "streamId" or "id" (or "index" might be better than "id", which sounds = like a label of some sort). I dislike "sid" for similar reasons to = disliking "rtx". >=20 >> I like the idea that reliable+ordered is the default, and both >> reliability and ordered can be set independently. I also prefer >> "ordered" over "outOfOrderAllowed", and along with that I like the >> idea of a "reliable" flag that, if false, is the equivalent of either >> maxRetransmitNum:0 or maxRetransmitTime:0. Finally, I think >> "maxRetransmitTime" should make its units clear, perhaps calling it >> "maxRetransmitMillis", and "maxRetransmitNum" could be shortened to >> simply "maxRetransmits". >=20 > Those seem reasonable (I'd use Millisec/MilliSec or perhaps MS instead = of Millis -- how are millisecond time values in other HTML5 specs = described?). On "reliable:false" - is this just a shorthand for = "ordered:false, maxRetransmits:0"? If so, I'm probably ok with it - = it's redundant, but makes it easy to use/read for a common case. Does this mean that if I want ordered:true maxRetransmits:0 or ordered:false maxRetransmits:1 I have to set reliable:true? That doesn't make sense... Also reliability = is independent from ordering. I would prefer to avoid redundancy there. Best regards Michael >=20 >>=20 >> So the dictionary for my bikeshed would be: >>=20 >> dictionary DataChannelInit { >> DOMString protocol; >> unsigned short id; >> boolean ordered; >> boolean reliable; >> unsigned short maxRetransmits; >> unsigned short maxRetransmitMillis; >> }; >=20 > --=20 > Randell Jesup > randell-ietf@jesup.org >=20 > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb >=20 From piranna@gmail.com Wed Apr 3 11:37:25 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 14D5D21F8BB7 for ; Wed, 3 Apr 2013 11:37:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.599 X-Spam-Level: X-Spam-Status: No, score=-3.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NePqp-1r9gL1 for ; Wed, 3 Apr 2013 11:37:24 -0700 (PDT) Received: from mail-wg0-f54.google.com (mail-wg0-f54.google.com [74.125.82.54]) by ietfa.amsl.com (Postfix) with ESMTP id 2100D21F8BE0 for ; Wed, 3 Apr 2013 11:37:23 -0700 (PDT) Received: by mail-wg0-f54.google.com with SMTP id a12so1906989wgh.33 for ; Wed, 03 Apr 2013 11:37:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:content-transfer-encoding; bh=ZOdvarbxYmjk6gQ8mSoWB+1/5UyZuKd9oC5jfE80peM=; b=r0qbfiSnO4NC6aQrhZXd0ReCDONDIxYuudm8eDmyQ6ixkkVEMwbAQJGE451fDaFDXh 7iZOZG67yDSZOTMV33HkIhnsmPDmmqJqs2jFn80biJKoY8LGNZRr8LC/no0bQw9UeSW7 nUOhh3QlmoSHoslInuVw93aAblxXyU7Ttj4jvTf7FR8DVgV8ZuzzddrO/cIGTAM76rTr juMlkAzq0Ecd7/QkeoYN4ifIqPYi9h6e3Wlir6oUpBc+99HnSXonuCEeiAYBtcMpbiW9 UbASPd3Gm08ihDo3B9qcS10kmzqA5ygQ7OX78oElwIaXaXKtN8+hDcsYZdWlG3l4A5hu Pm1A== X-Received: by 10.180.108.106 with SMTP id hj10mr11605004wib.0.1365014243335; Wed, 03 Apr 2013 11:37:23 -0700 (PDT) MIME-Version: 1.0 Received: by 10.194.219.135 with HTTP; Wed, 3 Apr 2013 11:37:03 -0700 (PDT) In-Reply-To: <515C56F6.8070308@jesup.org> References: <5158F0FC.3070104@jesup.org> <5159E6F9.4070808@jesup.org> <515C5688.4070004@jesup.org> <515C56F6.8070308@jesup.org> From: "piranna@gmail.com" Date: Wed, 3 Apr 2013 20:37:03 +0200 Message-ID: To: Randell Jesup Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Cc: "rtcweb@ietf.org" , "public-webrtc@w3.org" Subject: Re: [rtcweb] DataChannels API and external negotiation X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Apr 2013 18:37:25 -0000 I agree with Peter (all the parameter in a dictionary), also with the one about to put the label inside it. Also this way, it would be the label optional too and be able to identify the DataChannel this way using the other parameters, as for example the protocol. 2013/4/3 Randell Jesup : > Adding W3 list back ("Reply List" replies to one list in TB), since this > really is a W3 item anyways. > > On 4/3/2013 12:19 PM, Randell Jesup wrote: >> >> On 4/3/2013 12:05 PM, Peter Thatcher wrote: >>> >>> I think moving protocol into the dictionary is a good idea. In fact, >>> I'd like to see label move there as well, but that's probably asking >>> too much. >>> >>> And now for a little of my own bikeshedding: >>> >>> I don't understand way we have "stream" and "preset", since you can >>> only set "stream" if "preset" is true. Why not just make the rule "if >>> stream is set, no in-band message is sent", and get rid of "preset" >>> altogether? I really don't like the word "stream" sneaking in, since >>> it's so overloaded (MediaStream, RTP Stream, etc). I'd prefer "sid" >>> or just "id". >> >> >> The reason was that I wanted a way to have the system select a stream to >> use (that you can then communicate externally to the other side); this >> avoids any chance of a collision with existing streams. If this is seen = as >> not useful, then we can collapse it to a single entry. (I also toyed w= ith >> using stream 65535 as a flag to tell the system to allocate one; that se= emed >> too hacky.) >> >> Since this option was almost solely for those who understand the >> underlying SCTP-ness of this, I used "stream", but I'm fine with "stream= Id" >> or "id" (or "index" might be better than "id", which sounds like a label= of >> some sort). I dislike "sid" for similar reasons to disliking "rtx". >> >> >>> I like the idea that reliable+ordered is the default, and both >>> reliability and ordered can be set independently. I also prefer >>> "ordered" over "outOfOrderAllowed", and along with that I like the >>> idea of a "reliable" flag that, if false, is the equivalent of either >>> maxRetransmitNum:0 or maxRetransmitTime:0. Finally, I think >>> "maxRetransmitTime" should make its units clear, perhaps calling it >>> "maxRetransmitMillis", and "maxRetransmitNum" could be shortened to >>> simply "maxRetransmits". >> >> >> Those seem reasonable (I'd use Millisec/MilliSec or perhaps MS instead o= f >> Millis -- how are millisecond time values in other HTML5 specs described= ?). >> On "reliable:false" - is this just a shorthand for "ordered:false, >> maxRetransmits:0"? If so, I'm probably ok with it - it's redundant, but >> makes it easy to use/read for a common case. >> >> >>> >>> So the dictionary for my bikeshed would be: >>> >>> dictionary DataChannelInit { >>> DOMString protocol; >>> unsigned short id; >>> boolean ordered; >>> boolean reliable; >>> unsigned short maxRetransmits; >>> unsigned short maxRetransmitMillis; >>> }; >> >> > > > -- > Randell Jesup > randell-ietf@jesup.org > > --=20 "Si quieres viajar alrededor del mundo y ser invitado a hablar en un monton de sitios diferentes, simplemente escribe un sistema operativo Unix." =96 Linus Tordvals, creador del sistema operativo Linux From pthatcher@google.com Wed Apr 3 20:13:15 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6C4D021F84F5 for ; Wed, 3 Apr 2013 20:13:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -101.977 X-Spam-Level: X-Spam-Status: No, score=-101.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id I1WKNe6M7euH for ; Wed, 3 Apr 2013 20:13:14 -0700 (PDT) Received: from mail-pd0-f169.google.com (mail-pd0-f169.google.com [209.85.192.169]) by ietfa.amsl.com (Postfix) with ESMTP id C7ED521F84E7 for ; Wed, 3 Apr 2013 20:13:14 -0700 (PDT) Received: by mail-pd0-f169.google.com with SMTP id 10so1199915pdc.14 for ; Wed, 03 Apr 2013 20:13:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=cWEn+Z0mgnkg42fwBvyLONttB+53lLG9TWSDjNRr0bA=; b=j3WpUzmLnM+JXt+BvJR5Y0NbYTD2KTRkVaVY9R9G/7uwzHU26h4uUBZKvwV+8V31HN WXbqhSjbDISciseUHByLgHrCHpihYvlp7xJtd2E4dwr9sMuJfZOGgsUtw/FtkiP0V6jB udSuO29itk5+boUnESzniLZkzXBX4anbHY6t09BFLZql7ZF6kGB9Qd7tE6ZCrKS3I1Tn V/onupOw3+wubP4qlsrt8qfnOVpnu0outcaV2RnELExro//xZeBkUMFm+OjDtL3RUz6O OqPDAweqt9brw9CAt/J50mUJetRSgdpYZLqJZVxZfZXPhJ/FoLOe9hAHDHLXkCaoZ4FL nMiQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:x-gm-message-state; bh=cWEn+Z0mgnkg42fwBvyLONttB+53lLG9TWSDjNRr0bA=; b=UfSlkXPw9no3yGscaIbHVpqWB8cz8lYoSHApdGY1UaMgA0RcArxkurM37QbLod+Zub tx27kkVtD5qaUol42+SisEmDWwH4HPuN5d7SyZBmzZcDAo3b9kniRimB94ILxLKUaQTW jJQYHqo46cRx0RPfk9vB9OFgHoG/AW38fsxWq7KBM+Uj5gc5vvIeJ+mbfeN/oYI3F6C7 yXAOmNa4ACI9+vIMU1eFxjZEWYuVFnOElM3J/CNfjLnjcQkD0yBoD22UA86VQVD80aVs 9ThgjWFg6ROfs6xUlX5QvkBh8tT1+OP0zhZ3WUB7W4pjHXZfUD9LOxPu/MrH6XJSwJyL uATg== X-Received: by 10.68.160.162 with SMTP id xl2mr6363059pbb.29.1365045194405; Wed, 03 Apr 2013 20:13:14 -0700 (PDT) MIME-Version: 1.0 Received: by 10.66.248.196 with HTTP; Wed, 3 Apr 2013 20:12:34 -0700 (PDT) In-Reply-To: <515C56F6.8070308@jesup.org> References: <5158F0FC.3070104@jesup.org> <5159E6F9.4070808@jesup.org> <515C5688.4070004@jesup.org> <515C56F6.8070308@jesup.org> From: Peter Thatcher Date: Wed, 3 Apr 2013 20:12:34 -0700 Message-ID: To: Randell Jesup Content-Type: text/plain; charset=UTF-8 X-Gm-Message-State: ALoCoQnG0YWbX0cOQdHqmdhYgojjvTb0vGoRT+Tx4nUQd0WD867Zj2SX+XQksaXqIAhKeKZhiHdOA9sSPSe7VATj2Eq+gElEtmGNm9id7evXBlsOXRyEFKtd22rw90szfGuPPHIUURYcEW9UkPcE4LHYh2zc1P9JfOwc9hPzIwRYFirJEpmN+rj+zti2V8iPQlcXgzIwPeCu Cc: "" , "public-webrtc@w3.org" Subject: Re: [rtcweb] DataChannels API and external negotiation X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 03:13:15 -0000 Randell, thanks for explaining. I think it's a valid use case to say "I don't want the in-band open message, but I do want you to choose the SID for me". In that case, I'm OK with a separate flag meaning "send the in-band open message", and I'd prefer a name like "sendOpenMessage" or "sendControlMessages", which would default to true. On "sid", If you don't like "sid", I'm OK with "id", or even "streamid", but I prefer "id" over "streamid". I don't like "index". On "millis" vs. "millsecs", the closest thing in HTML I could find was the Date object, which has "getMilliseconds". That would lean us toward "maxRetransmitMillieseconds", which seems too long. But I don't care too much about this name, and would be happy with any of "maxRetransmitMs" or "maxRetransmitMillis", "maxRetransmitMilliseconds", "maxRetransmitTime" or "maxRetransmitDuration". On "reliable: false", I'd say it's a synonym for "maxRetransmits: 0". You can have "{ordered: true; reliable: false"} or "{ordered: false; reliable: true}", which is the same as "{ordered:true, maxRetransmits:0}" or "{ordered:false}", respectively. Michael, you don't have to set "reliable: true", since that's the default. This is only to allow "reliable: false" as a more readable and easy to understand way of saying "maxRetransmits: 0". It's purely a convenience synonym. Finally, if it's possible for us to make such a breaking change, I do think it makes sense to optionally allow the browser to choose the label, just as it optionally chooses the sid. As such, I'll include that idea in the dictionary I propose below so that createDataChannel would take only one argument, this dictionary (like so: createDataChannel({"label: XYZ", ...}). If everyone else dislikes this idea, then so be, take out that field and keep the rest. I feel more strongly about the rest of the names and options than I do about that one. But if we can make the change, I think it makes the method cleaner and more flexible. So, I update my proposed dictionary to be the following: dictionary DataChannelInit { DOMString label; // default: chosen by browser. DOMString protocol; // default: undefined unsigned short id; // default: chosen by browser. boolean ordered = true; boolean reliable = true; // false is just a synonym for maxRetransmits: 0. unsigned short maxRetransmits; // default: "forever" unsigned short maxRetransmitMilliseconds; // default: "forever" boolean sendOpenMessage = true; }; On Wed, Apr 3, 2013 at 9:21 AM, Randell Jesup wrote: > Adding W3 list back ("Reply List" replies to one list in TB), since this > really is a W3 item anyways. > > > On 4/3/2013 12:19 PM, Randell Jesup wrote: >> >> On 4/3/2013 12:05 PM, Peter Thatcher wrote: >>> >>> I think moving protocol into the dictionary is a good idea. In fact, >>> I'd like to see label move there as well, but that's probably asking >>> too much. >>> >>> And now for a little of my own bikeshedding: >>> >>> I don't understand way we have "stream" and "preset", since you can >>> only set "stream" if "preset" is true. Why not just make the rule "if >>> stream is set, no in-band message is sent", and get rid of "preset" >>> altogether? I really don't like the word "stream" sneaking in, since >>> it's so overloaded (MediaStream, RTP Stream, etc). I'd prefer "sid" >>> or just "id". >> >> >> The reason was that I wanted a way to have the system select a stream to >> use (that you can then communicate externally to the other side); this >> avoids any chance of a collision with existing streams. If this is seen as >> not useful, then we can collapse it to a single entry. (I also toyed with >> using stream 65535 as a flag to tell the system to allocate one; that seemed >> too hacky.) >> >> Since this option was almost solely for those who understand the >> underlying SCTP-ness of this, I used "stream", but I'm fine with "streamId" >> or "id" (or "index" might be better than "id", which sounds like a label of >> some sort). I dislike "sid" for similar reasons to disliking "rtx". >> >>> I like the idea that reliable+ordered is the default, and both >>> reliability and ordered can be set independently. I also prefer >>> "ordered" over "outOfOrderAllowed", and along with that I like the >>> idea of a "reliable" flag that, if false, is the equivalent of either >>> maxRetransmitNum:0 or maxRetransmitTime:0. Finally, I think >>> "maxRetransmitTime" should make its units clear, perhaps calling it >>> "maxRetransmitMillis", and "maxRetransmitNum" could be shortened to >>> simply "maxRetransmits". >> >> >> Those seem reasonable (I'd use Millisec/MilliSec or perhaps MS instead of >> Millis -- how are millisecond time values in other HTML5 specs described?). >> On "reliable:false" - is this just a shorthand for "ordered:false, >> maxRetransmits:0"? If so, I'm probably ok with it - it's redundant, but >> makes it easy to use/read for a common case. >> >>> >>> So the dictionary for my bikeshed would be: >>> >>> dictionary DataChannelInit { >>> DOMString protocol; >>> unsigned short id; >>> boolean ordered; >>> boolean reliable; >>> unsigned short maxRetransmits; >>> unsigned short maxRetransmitMillis; >>> }; >> >> > > > -- > Randell Jesup > randell-ietf@jesup.org > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From sergio.garcia.murillo@gmail.com Thu Apr 4 01:53:58 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4F03821F9616 for ; Thu, 4 Apr 2013 01:53:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.598 X-Spam-Level: X-Spam-Status: No, score=-3.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XWKODCOPiGMx for ; Thu, 4 Apr 2013 01:53:57 -0700 (PDT) Received: from mail-ee0-f47.google.com (mail-ee0-f47.google.com [74.125.83.47]) by ietfa.amsl.com (Postfix) with ESMTP id 0432721F95DB for ; Thu, 4 Apr 2013 01:53:56 -0700 (PDT) Received: by mail-ee0-f47.google.com with SMTP id t10so930004eei.20 for ; Thu, 04 Apr 2013 01:53:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:message-id:date:from:user-agent:mime-version:to:subject :references:in-reply-to:content-type; bh=00bWlhZ1/JkGU/9gsru6NNgcZJilX6EDAjOqhkABA5s=; b=wTNER73p+z+gjLgLI6AEY1SC/OgpHDJ6YC7k/hB68c7rfDeUNPL7qj4HsbpmiLe0/Q 65q/lXO9qp9yV85IogAW4lrNkwP7MbfNJT0jUYs6WtOot3aITsKksdNwq79p3dLa1Ki5 Df4/kbGtl4btjtF9AYc+Q5oIV2mfUTC1vYOgwdieIJ0gbT1ryviTHoBFIcW7T/ox2vj8 //svMqFdbqRkVK7CV1FDLoaLQyOf4NKcIuqsjrJ91OI7eQ6lPaZPbFvrvgZSyQNeMM3n NSg6xkl6MnCIJ0TjDNV8DcTspYjN64nGYpt1YCSaJvex6eyric+iPVBqkG4TNikwlxuc 6xog== X-Received: by 10.14.179.5 with SMTP id g5mr9209204eem.41.1365065632873; Thu, 04 Apr 2013 01:53:52 -0700 (PDT) Received: from [192.168.1.45] (252.Red-95-122-166.staticIP.rima-tde.net. [95.122.166.252]) by mx.google.com with ESMTPS id bc1sm10359735eeb.11.2013.04.04.01.53.50 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 04 Apr 2013 01:53:51 -0700 (PDT) Message-ID: <515D3FA1.6050305@gmail.com> Date: Thu, 04 Apr 2013 10:53:53 +0200 From: Sergio Garcia Murillo User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130307 Thunderbird/17.0.4 MIME-Version: 1.0 To: rtcweb@ietf.org References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------050809010103020008000403" Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 08:53:58 -0000 This is a multi-part message in MIME format. --------------050809010103020008000403 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Hi Adrian, Could you explain how the encoding parametrization is comparable? x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \ --vbv-init 0.8 --bitrate ${rate} --fps ${frame_rate} \ --profile baseline --no-scenecut --keyint infinite --preset veryslow \ --input-res ${width}x${height} \ --tune psnr \ -o ./encoded_clips/h264/${clip_stem}_${rate}kbps.mkv ${filename} \ 2> ./logs/h264/${clip_stem}_${rate}kbps.txt vs: ./bin/vpxenc --lag-in-frames=0 --target-bitrate=${rate} --kf-min-dist=3000 \ --kf-max-dist=3000 --cpu-used=0 --fps=${frame_rate}/1 --static-thresh=0 \ --token-parts=1 --drop-frame=0 --end-usage=cbr --min-q=2 --max-q=56 \ --undershoot-pct=100 --overshoot-pct=15 --buf-sz=1000 \ --buf-initial-sz=800 --buf-optimal-sz=1000 --max-intra-rate=1200 \ --resize-allowed=0 --drop-frame=0 --passes=1 --good --noise-sensitivity=0 \ -w ${width} -h ${height} ${filename} --codec=vp8 \ -o ./encoded_clips/vp8/${clip_stem}_${rate}kbps.webm \ &>./logs/vp8/${clip_stem}_${rate}kbps.txt Best regards Sergio El 03/04/2013 18:20, Adrian Grange escribió: > We have uploaded a new set of test results comparing VP8 to H.264. > This latest set contains fixes for some of the problems in the > previous set. We would like to extend our thanks to those who made > suggestions as to how we could improve our methodology and encourage > suggestions as to how we can make further improvements. > > In these tests we run x264 with the "veryslow" preset and VP8 with the > "good, speed 0" setting in an attempt to produce comparable results. > > An overview of our results is available as follows: > > - A Quality comparison (psnr): > http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_quality.html > > - An Encode Speed comparison: > http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_speed.html > > - A comparison of the aggregate time required to decode all of the > clips in the test: > http://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt > > All of our test scripts can either be downloaded from: > http://downloads.webmproject.org/ietf_tests/vp8_vs_h264.tar.xz > or checked out of our git/gerrit repository: > git clone http://git.chromium.org/webm/vpx_codec_comparison.git > > The file README.txt, contained within, presents details of how to > build and run the tests. > > The compressed video files--the output from the quality tests--can > also be downloaded: > > VP8: > http://downloads.webmproject.org/ietf_tests/vp8_videos > /index.html > > H.264: > http://downloads.webmproject.org/ietf_tests/h264_videos/index.html > > Adrian Grange > > > > > > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb --------------050809010103020008000403 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
Hi Adrian,

Could you explain how the encoding parametrization is comparable?

x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \
      --vbv-init 0.8 --bitrate ${rate} --fps ${frame_rate} \
      --profile baseline --no-scenecut --keyint infinite --preset veryslow \
      --input-res ${width}x${height} \
      --tune psnr \
      -o ./encoded_clips/h264/${clip_stem}_${rate}kbps.mkv ${filename} \
      2> ./logs/h264/${clip_stem}_${rate}kbps.txt

vs:

 ./bin/vpxenc --lag-in-frames=0 --target-bitrate=${rate} --kf-min-dist=3000 \
      --kf-max-dist=3000 --cpu-used=0 --fps=${frame_rate}/1 --static-thresh=0 \
      --token-parts=1 --drop-frame=0 --end-usage=cbr --min-q=2 --max-q=56 \
      --undershoot-pct=100 --overshoot-pct=15 --buf-sz=1000 \
      --buf-initial-sz=800 --buf-optimal-sz=1000 --max-intra-rate=1200 \
      --resize-allowed=0 --drop-frame=0 --passes=1 --good --noise-sensitivity=0 \
      -w ${width} -h ${height} ${filename} --codec=vp8 \
      -o ./encoded_clips/vp8/${clip_stem}_${rate}kbps.webm \
      &>./logs/vp8/${clip_stem}_${rate}kbps.txt

Best regards
Sergio

El 03/04/2013 18:20, Adrian Grange escribió:
We have uploaded a new set of test results comparing VP8 to H.264. This latest set contains fixes for some of the problems in the previous set. We would like to extend our thanks to those who made suggestions as to how we could improve our methodology and encourage suggestions as to how we can make further improvements.

In these tests we run x264 with the "veryslow" preset and VP8 with the "good, speed 0" setting in an attempt to produce comparable results.

An overview of our results is available as follows:



- A comparison of the aggregate time required to decode all of the clips in the test: http://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt

All of our test scripts can either be downloaded from:
or checked out of our git/gerrit repository:

The file README.txt, contained within, presents details of how to build and run the tests.

The compressed video files--the output from the quality tests--can also be downloaded:






_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
https://www.ietf.org/mailman/listinfo/rtcweb

--------------050809010103020008000403-- From harald@alvestrand.no Thu Apr 4 06:30:53 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 11FBA21F8782 for ; Thu, 4 Apr 2013 06:30:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.598 X-Spam-Level: X-Spam-Status: No, score=-110.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wZUclUblZ378 for ; Thu, 4 Apr 2013 06:30:52 -0700 (PDT) Received: from eikenes.alvestrand.no (eikenes.alvestrand.no [158.38.152.233]) by ietfa.amsl.com (Postfix) with ESMTP id C6A2321F85EB for ; Thu, 4 Apr 2013 06:30:51 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by eikenes.alvestrand.no (Postfix) with ESMTP id 1C7D239E116 for ; Thu, 4 Apr 2013 15:30:49 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at eikenes.alvestrand.no Received: from eikenes.alvestrand.no ([127.0.0.1]) by localhost (eikenes.alvestrand.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1qTPbAz7e3ch for ; Thu, 4 Apr 2013 15:30:47 +0200 (CEST) Received: from hta-dell.lul.corp.google.com (62-20-124-50.customer.telia.com [62.20.124.50]) by eikenes.alvestrand.no (Postfix) with ESMTPSA id 9208E39E056 for ; Thu, 4 Apr 2013 15:30:47 +0200 (CEST) Message-ID: <515D8087.6080409@alvestrand.no> Date: Thu, 04 Apr 2013 15:30:47 +0200 From: Harald Alvestrand User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130308 Thunderbird/17.0.4 MIME-Version: 1.0 To: rtcweb@ietf.org References: <515D3FA1.6050305@gmail.com> In-Reply-To: <515D3FA1.6050305@gmail.com> Content-Type: multipart/alternative; boundary="------------020601080504010300060102" Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 13:30:53 -0000 This is a multi-part message in MIME format. --------------020601080504010300060102 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit On 04/04/2013 10:53 AM, Sergio Garcia Murillo wrote: > Hi Adrian, > > Could you explain how the encoding parametrization is comparable? > > x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \ > --vbv-init 0.8 --bitrate ${rate} --fps ${frame_rate} \ > --profile baseline --no-scenecut --keyint infinite --preset > veryslow \ > --input-res ${width}x${height} \ > --tune psnr \ > -o ./encoded_clips/h264/${clip_stem}_${rate}kbps.mkv ${filename} \ > 2> ./logs/h264/${clip_stem}_${rate}kbps.txt > > vs: > > ./bin/vpxenc --lag-in-frames=0 --target-bitrate=${rate} > --kf-min-dist=3000 \ > --kf-max-dist=3000 --cpu-used=0 --fps=${frame_rate}/1 > --static-thresh=0 \ > --token-parts=1 --drop-frame=0 --end-usage=cbr --min-q=2 > --max-q=56 \ > --undershoot-pct=100 --overshoot-pct=15 --buf-sz=1000 \ > --buf-initial-sz=800 --buf-optimal-sz=1000 --max-intra-rate=1200 \ > --resize-allowed=0 --drop-frame=0 --passes=1 --good > --noise-sensitivity=0 \ > -w ${width} -h ${height} ${filename} --codec=vp8 \ > -o ./encoded_clips/vp8/${clip_stem}_${rate}kbps.webm \ > &>./logs/vp8/${clip_stem}_${rate}kbps.txt Both have the same target bitrate and the same resolution, and neither generates periodic keyframes. Apart from that, I think they are comparable by virtue of being the parameters that were recommended for this test by people who like this particular codec implementation. Was there any specific parameter or parameter set you were wondering about? > > Best regards > Sergio > > El 03/04/2013 18:20, Adrian Grange escribió: >> We have uploaded a new set of test results comparing VP8 to H.264. >> This latest set contains fixes for some of the problems in the >> previous set. We would like to extend our thanks to those who made >> suggestions as to how we could improve our methodology and encourage >> suggestions as to how we can make further improvements. >> >> In these tests we run x264 with the "veryslow" preset and VP8 with >> the "good, speed 0" setting in an attempt to produce comparable results. >> >> An overview of our results is available as follows: >> >> - A Quality comparison (psnr): >> http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_quality.html >> >> - An Encode Speed comparison: >> http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_speed.html >> >> - A comparison of the aggregate time required to decode all of the >> clips in the test: >> http://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt >> >> All of our test scripts can either be downloaded from: >> http://downloads.webmproject.org/ietf_tests/vp8_vs_h264.tar.xz >> or checked out of our git/gerrit repository: >> git clone http://git.chromium.org/webm/vpx_codec_comparison.git >> >> The file README.txt, contained within, presents details of how to >> build and run the tests. >> >> The compressed video files--the output from the quality tests--can >> also be downloaded: >> >> VP8: >> http://downloads.webmproject.org/ietf_tests/vp8_videos >> /index.html >> >> H.264: >> http://downloads.webmproject.org/ietf_tests/h264_videos/index.html >> >> Adrian Grange >> >> >> >> >> >> >> >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb > > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb --------------020601080504010300060102 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
On 04/04/2013 10:53 AM, Sergio Garcia Murillo wrote:
Hi Adrian,

Could you explain how the encoding parametrization is comparable?

x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \
      --vbv-init 0.8 --bitrate ${rate} --fps ${frame_rate} \
      --profile baseline --no-scenecut --keyint infinite --preset veryslow \
      --input-res ${width}x${height} \
      --tune psnr \
      -o ./encoded_clips/h264/${clip_stem}_${rate}kbps.mkv ${filename} \
      2> ./logs/h264/${clip_stem}_${rate}kbps.txt

vs:

 ./bin/vpxenc --lag-in-frames=0 --target-bitrate=${rate} --kf-min-dist=3000 \
      --kf-max-dist=3000 --cpu-used=0 --fps=${frame_rate}/1 --static-thresh=0 \
      --token-parts=1 --drop-frame=0 --end-usage=cbr --min-q=2 --max-q=56 \
      --undershoot-pct=100 --overshoot-pct=15 --buf-sz=1000 \
      --buf-initial-sz=800 --buf-optimal-sz=1000 --max-intra-rate=1200 \
      --resize-allowed=0 --drop-frame=0 --passes=1 --good --noise-sensitivity=0 \
      -w ${width} -h ${height} ${filename} --codec=vp8 \
      -o ./encoded_clips/vp8/${clip_stem}_${rate}kbps.webm \
      &>./logs/vp8/${clip_stem}_${rate}kbps.txt

Both have the same target bitrate and the same resolution, and neither generates periodic keyframes.

Apart from that, I think they are comparable by virtue of being the parameters that were recommended for this test by people who like this particular codec implementation.

Was there any specific parameter or parameter set you were wondering about?



Best regards
Sergio

El 03/04/2013 18:20, Adrian Grange escribió:
We have uploaded a new set of test results comparing VP8 to H.264. This latest set contains fixes for some of the problems in the previous set. We would like to extend our thanks to those who made suggestions as to how we could improve our methodology and encourage suggestions as to how we can make further improvements.

In these tests we run x264 with the "veryslow" preset and VP8 with the "good, speed 0" setting in an attempt to produce comparable results.

An overview of our results is available as follows:



- A comparison of the aggregate time required to decode all of the clips in the test: http://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt

All of our test scripts can either be downloaded from:
or checked out of our git/gerrit repository:

The file README.txt, contained within, presents details of how to build and run the tests.

The compressed video files--the output from the quality tests--can also be downloaded:






_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
https://www.ietf.org/mailman/listinfo/rtcweb




_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
https://www.ietf.org/mailman/listinfo/rtcweb

--------------020601080504010300060102-- From ldecicco@gmail.com Thu Apr 4 06:59:50 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0EE7B21F8BD4 for ; Thu, 4 Apr 2013 06:59:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qnwWT8bMGntz for ; Thu, 4 Apr 2013 06:59:49 -0700 (PDT) Received: from mail-ob0-x234.google.com (mail-ob0-x234.google.com [IPv6:2607:f8b0:4003:c01::234]) by ietfa.amsl.com (Postfix) with ESMTP id 4212F21F8BC0 for ; Thu, 4 Apr 2013 06:59:49 -0700 (PDT) Received: by mail-ob0-f180.google.com with SMTP id wo10so2501305obc.25 for ; Thu, 04 Apr 2013 06:59:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type:content-transfer-encoding; bh=hDg78hyUfXKCzEOWRaQpoqjTjWoDSwrWqzovMdoarBA=; b=vI6bFi3wFV3HeFLlitmnmwSBItgR9vTg2WeudAmc0VcmOLsFICHXiJ3ZVRdn588rCx l5WGUuIFnlZ/FSPCfvg3HdMWQU1/ssJVl5767XwJRw6kyX+1TVxN9DlS8cyMJvh8C09q QDCto0ONmtFJSPuIMfo/jw15pZSgtiHeSJoPpKrcqQJA44/GRDQqRB4Bid598wLk5x+K T6DyvvA7+0bWIe5aS05wMsnf44CLJdImmly5lr1Ry650hSrUunOmfhGm2sVKYurtaf7J vBhdeNc7QIMQuQSMjjXNMWysjwe+9VRoatQtufyMUGOcZ5E1QdP3knI/dnJREgoIbwOd 9Aow== MIME-Version: 1.0 X-Received: by 10.182.131.4 with SMTP id oi4mr4331731obb.64.1365083988827; Thu, 04 Apr 2013 06:59:48 -0700 (PDT) Received: by 10.76.122.46 with HTTP; Thu, 4 Apr 2013 06:59:48 -0700 (PDT) In-Reply-To: <515D8087.6080409@alvestrand.no> References: <515D3FA1.6050305@gmail.com> <515D8087.6080409@alvestrand.no> Date: Thu, 4 Apr 2013 15:59:48 +0200 Message-ID: From: Luca De Cicco To: Harald Alvestrand Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 13:59:50 -0000 Why did you use baseline instead of mainline or highline for x264? It should be better to compare vp8 at least with the mainline profile. Cheers, Luca On Thu, Apr 4, 2013 at 3:30 PM, Harald Alvestrand wr= ote: > On 04/04/2013 10:53 AM, Sergio Garcia Murillo wrote: > > Hi Adrian, > > Could you explain how the encoding parametrization is comparable? > > x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \ > --vbv-init 0.8 --bitrate ${rate} --fps ${frame_rate} \ > --profile baseline --no-scenecut --keyint infinite --preset veryslo= w \ > --input-res ${width}x${height} \ > --tune psnr \ > -o ./encoded_clips/h264/${clip_stem}_${rate}kbps.mkv ${filename} \ > 2> ./logs/h264/${clip_stem}_${rate}kbps.txt > > vs: > > ./bin/vpxenc --lag-in-frames=3D0 --target-bitrate=3D${rate} --kf-min-dis= t=3D3000 > \ > --kf-max-dist=3D3000 --cpu-used=3D0 --fps=3D${frame_rate}/1 > --static-thresh=3D0 \ > --token-parts=3D1 --drop-frame=3D0 --end-usage=3Dcbr --min-q=3D2 --= max-q=3D56 \ > --undershoot-pct=3D100 --overshoot-pct=3D15 --buf-sz=3D1000 \ > --buf-initial-sz=3D800 --buf-optimal-sz=3D1000 --max-intra-rate=3D1= 200 \ > --resize-allowed=3D0 --drop-frame=3D0 --passes=3D1 --good > --noise-sensitivity=3D0 \ > -w ${width} -h ${height} ${filename} --codec=3Dvp8 \ > -o ./encoded_clips/vp8/${clip_stem}_${rate}kbps.webm \ > &>./logs/vp8/${clip_stem}_${rate}kbps.txt > > > Both have the same target bitrate and the same resolution, and neither > generates periodic keyframes. > > Apart from that, I think they are comparable by virtue of being the > parameters that were recommended for this test by people who like this > particular codec implementation. > > Was there any specific parameter or parameter set you were wondering abou= t? > > > > > Best regards > Sergio > > El 03/04/2013 18:20, Adrian Grange escribi=F3: > > We have uploaded a new set of test results comparing VP8 to H.264. This > latest set contains fixes for some of the problems in the previous set. W= e > would like to extend our thanks to those who made suggestions as to how w= e > could improve our methodology and encourage suggestions as to how we can > make further improvements. > > In these tests we run x264 with the "veryslow" preset and VP8 with the > "good, speed 0" setting in an attempt to produce comparable results. > > An overview of our results is available as follows: > > - A Quality comparison (psnr): > http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_quality.html > > - An Encode Speed comparison: > http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_speed.html > > - A comparison of the aggregate time required to decode all of the clips = in > the test: > http://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt > > All of our test scripts can either be downloaded from: > http://downloads.webmproject.org/ietf_tests/vp8_vs_h264.tar.xz > or checked out of our git/gerrit repository: > git clone http://git.chromium.org/webm/vpx_codec_comparison.git > > The file README.txt, contained within, presents details of how to build a= nd > run the tests. > > The compressed video files--the output from the quality tests--can also b= e > downloaded: > > VP8: > http://downloads.webmproject.org/ietf_tests/vp8_videos/index.html > > H.264: > http://downloads.webmproject.org/ietf_tests/h264_videos/index.html > > Adrian Grange > > > > > > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > > > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > From harald@alvestrand.no Thu Apr 4 07:30:50 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BDB2421F940B for ; Thu, 4 Apr 2013 07:30:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.599 X-Spam-Level: X-Spam-Status: No, score=-110.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id u3soP3byWHjo for ; Thu, 4 Apr 2013 07:30:49 -0700 (PDT) Received: from eikenes.alvestrand.no (eikenes.alvestrand.no [158.38.152.233]) by ietfa.amsl.com (Postfix) with ESMTP id 8559721F942B for ; Thu, 4 Apr 2013 07:30:49 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by eikenes.alvestrand.no (Postfix) with ESMTP id 7BA3D39E116; Thu, 4 Apr 2013 16:30:48 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at eikenes.alvestrand.no Received: from eikenes.alvestrand.no ([127.0.0.1]) by localhost (eikenes.alvestrand.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0eyP4DR9DRaX; Thu, 4 Apr 2013 16:30:47 +0200 (CEST) Received: from hta-dell.lul.corp.google.com (62-20-124-50.customer.telia.com [62.20.124.50]) by eikenes.alvestrand.no (Postfix) with ESMTPSA id 0F7F439E056; Thu, 4 Apr 2013 16:30:47 +0200 (CEST) Message-ID: <515D8E96.2080407@alvestrand.no> Date: Thu, 04 Apr 2013 16:30:46 +0200 From: Harald Alvestrand User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130308 Thunderbird/17.0.4 MIME-Version: 1.0 To: Luca De Cicco References: <515D3FA1.6050305@gmail.com> <515D8087.6080409@alvestrand.no> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 14:30:50 -0000 On 04/04/2013 03:59 PM, Luca De Cicco wrote: > Why did you use baseline instead of mainline or highline for x264? It > should be better to compare > vp8 at least with the mainline profile. Better in what sense? This is the discussion of the MTI for RTCWEB; the proponents of H.264 as MTI have proposed: The core of the proposal is that H.264 Constrained Baseline Profile Level 1.2 MUST be supported as Mandatory To Implement video codec. To enable higher quality for devices capable of it, support for H.264 Constrained High Profile Level 1.3, extended to support 720p resolution at 30 Hz framerate is RECOMMENDED. (draft-burman-rtcweb-h264-proposal-01.txt section 1) The scripts we have published is trying to compare what the H.264 proponents have proposed for MTI with what the VP8 proponents have proposed for MTI. > > Cheers, > Luca > > On Thu, Apr 4, 2013 at 3:30 PM, Harald Alvestrand wrote: >> On 04/04/2013 10:53 AM, Sergio Garcia Murillo wrote: >> >> Hi Adrian, >> >> Could you explain how the encoding parametrization is comparable? >> >> x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \ >> --vbv-init 0.8 --bitrate ${rate} --fps ${frame_rate} \ >> --profile baseline --no-scenecut --keyint infinite --preset veryslow \ >> --input-res ${width}x${height} \ >> --tune psnr \ >> -o ./encoded_clips/h264/${clip_stem}_${rate}kbps.mkv ${filename} \ >> 2> ./logs/h264/${clip_stem}_${rate}kbps.txt >> >> vs: >> >> ./bin/vpxenc --lag-in-frames=0 --target-bitrate=${rate} --kf-min-dist=3000 >> \ >> --kf-max-dist=3000 --cpu-used=0 --fps=${frame_rate}/1 >> --static-thresh=0 \ >> --token-parts=1 --drop-frame=0 --end-usage=cbr --min-q=2 --max-q=56 \ >> --undershoot-pct=100 --overshoot-pct=15 --buf-sz=1000 \ >> --buf-initial-sz=800 --buf-optimal-sz=1000 --max-intra-rate=1200 \ >> --resize-allowed=0 --drop-frame=0 --passes=1 --good >> --noise-sensitivity=0 \ >> -w ${width} -h ${height} ${filename} --codec=vp8 \ >> -o ./encoded_clips/vp8/${clip_stem}_${rate}kbps.webm \ >> &>./logs/vp8/${clip_stem}_${rate}kbps.txt >> >> >> Both have the same target bitrate and the same resolution, and neither >> generates periodic keyframes. >> >> Apart from that, I think they are comparable by virtue of being the >> parameters that were recommended for this test by people who like this >> particular codec implementation. >> >> Was there any specific parameter or parameter set you were wondering about? >> >> >> >> >> Best regards >> Sergio >> >> El 03/04/2013 18:20, Adrian Grange escribió: >> >> We have uploaded a new set of test results comparing VP8 to H.264. This >> latest set contains fixes for some of the problems in the previous set. We >> would like to extend our thanks to those who made suggestions as to how we >> could improve our methodology and encourage suggestions as to how we can >> make further improvements. >> >> In these tests we run x264 with the "veryslow" preset and VP8 with the >> "good, speed 0" setting in an attempt to produce comparable results. >> >> An overview of our results is available as follows: >> >> - A Quality comparison (psnr): >> http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_quality.html >> >> - An Encode Speed comparison: >> http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_speed.html >> >> - A comparison of the aggregate time required to decode all of the clips in >> the test: >> http://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt >> >> All of our test scripts can either be downloaded from: >> http://downloads.webmproject.org/ietf_tests/vp8_vs_h264.tar.xz >> or checked out of our git/gerrit repository: >> git clone http://git.chromium.org/webm/vpx_codec_comparison.git >> >> The file README.txt, contained within, presents details of how to build and >> run the tests. >> >> The compressed video files--the output from the quality tests--can also be >> downloaded: >> >> VP8: >> http://downloads.webmproject.org/ietf_tests/vp8_videos/index.html >> >> H.264: >> http://downloads.webmproject.org/ietf_tests/h264_videos/index.html >> >> Adrian Grange >> >> >> >> >> >> >> >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb >> >> >> >> >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb >> >> >> >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb >> From ldecicco@gmail.com Thu Apr 4 07:38:26 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BBB9521F90A1 for ; Thu, 4 Apr 2013 07:38:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 82cYTf4tmEnk for ; Thu, 4 Apr 2013 07:38:26 -0700 (PDT) Received: from mail-ob0-x233.google.com (mail-ob0-x233.google.com [IPv6:2607:f8b0:4003:c01::233]) by ietfa.amsl.com (Postfix) with ESMTP id CE5C521F8D2C for ; Thu, 4 Apr 2013 07:38:25 -0700 (PDT) Received: by mail-ob0-f179.google.com with SMTP id vb8so2621731obc.10 for ; Thu, 04 Apr 2013 07:38:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type:content-transfer-encoding; bh=t3Zk1oCtr+Br0Gsmdx5T1hphSfYIo85e6AaKuMYGV20=; b=N8iRWsJI/sIskZhu6wOG5HLLm6bUWs9Lk/3TSWMwJIeVoh9XYZUuQGBdZv8+G82d67 69E4043mtVP1KoJdg61UI8KUDB3+6Hb6LeuA2fYa74j/rwuaX3y5kvbPP/9xw2yD45nY hW82tYhlax+OcDvQdFZrfidJZNDNm8p+XICJJ/G9mWEPF7LRG9MpTyP2r0PuhLSWwM4j xzbLlLgNzpB7g9gDeq3I7M0+Fjez+ky7332Nc5HVXI8D0xdzZ/c/Kjb3TkdIrlP1nlhj gzfXYjKuTjWpA91Uuz/6B065GlV4mvN3hL327L/xVOhn23LCcPnMq+yRMXY+NQN8dT4H Ol9w== MIME-Version: 1.0 X-Received: by 10.60.133.4 with SMTP id oy4mr4537944oeb.56.1365086305380; Thu, 04 Apr 2013 07:38:25 -0700 (PDT) Received: by 10.76.122.46 with HTTP; Thu, 4 Apr 2013 07:38:25 -0700 (PDT) In-Reply-To: <515D8E96.2080407@alvestrand.no> References: <515D3FA1.6050305@gmail.com> <515D8087.6080409@alvestrand.no> <515D8E96.2080407@alvestrand.no> Date: Thu, 4 Apr 2013 16:38:25 +0200 Message-ID: From: Luca De Cicco To: Harald Alvestrand Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 14:38:26 -0000 Ok, thanks for very clear explanation :). Luca On Thu, Apr 4, 2013 at 4:30 PM, Harald Alvestrand wr= ote: > On 04/04/2013 03:59 PM, Luca De Cicco wrote: >> >> Why did you use baseline instead of mainline or highline for x264? It >> should be better to compare >> vp8 at least with the mainline profile. > > Better in what sense? > > This is the discussion of the MTI for RTCWEB; the proponents of H.264 as = MTI > have proposed: > > The core of the proposal is that H.264 Constrained Baseline Profile > Level 1.2 MUST be supported as Mandatory To Implement video codec. > To enable higher quality for devices capable of it, support for H.264 > Constrained High Profile Level 1.3, extended to support 720p > resolution at 30 Hz framerate is RECOMMENDED. > > (draft-burman-rtcweb-h264-proposal-01.txt section 1) > > The scripts we have published is trying to compare what the H.264 propone= nts > have proposed for MTI with what the VP8 proponents have proposed for MTI. > > >> >> Cheers, >> Luca >> >> On Thu, Apr 4, 2013 at 3:30 PM, Harald Alvestrand >> wrote: >>> >>> On 04/04/2013 10:53 AM, Sergio Garcia Murillo wrote: >>> >>> Hi Adrian, >>> >>> Could you explain how the encoding parametrization is comparable? >>> >>> x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \ >>> --vbv-init 0.8 --bitrate ${rate} --fps ${frame_rate} \ >>> --profile baseline --no-scenecut --keyint infinite --preset >>> veryslow \ >>> --input-res ${width}x${height} \ >>> --tune psnr \ >>> -o ./encoded_clips/h264/${clip_stem}_${rate}kbps.mkv ${filename}= \ >>> 2> ./logs/h264/${clip_stem}_${rate}kbps.txt >>> >>> vs: >>> >>> ./bin/vpxenc --lag-in-frames=3D0 --target-bitrate=3D${rate} >>> --kf-min-dist=3D3000 >>> \ >>> --kf-max-dist=3D3000 --cpu-used=3D0 --fps=3D${frame_rate}/1 >>> --static-thresh=3D0 \ >>> --token-parts=3D1 --drop-frame=3D0 --end-usage=3Dcbr --min-q=3D2 >>> --max-q=3D56 \ >>> --undershoot-pct=3D100 --overshoot-pct=3D15 --buf-sz=3D1000 \ >>> --buf-initial-sz=3D800 --buf-optimal-sz=3D1000 --max-intra-rate= =3D1200 \ >>> --resize-allowed=3D0 --drop-frame=3D0 --passes=3D1 --good >>> --noise-sensitivity=3D0 \ >>> -w ${width} -h ${height} ${filename} --codec=3Dvp8 \ >>> -o ./encoded_clips/vp8/${clip_stem}_${rate}kbps.webm \ >>> &>./logs/vp8/${clip_stem}_${rate}kbps.txt >>> >>> >>> Both have the same target bitrate and the same resolution, and neither >>> generates periodic keyframes. >>> >>> Apart from that, I think they are comparable by virtue of being the >>> parameters that were recommended for this test by people who like this >>> particular codec implementation. >>> >>> Was there any specific parameter or parameter set you were wondering >>> about? >>> >>> >>> >>> >>> Best regards >>> Sergio >>> >>> El 03/04/2013 18:20, Adrian Grange escribi=F3: >>> >>> We have uploaded a new set of test results comparing VP8 to H.264. This >>> latest set contains fixes for some of the problems in the previous set. >>> We >>> would like to extend our thanks to those who made suggestions as to how >>> we >>> could improve our methodology and encourage suggestions as to how we ca= n >>> make further improvements. >>> >>> In these tests we run x264 with the "veryslow" preset and VP8 with the >>> "good, speed 0" setting in an attempt to produce comparable results. >>> >>> An overview of our results is available as follows: >>> >>> - A Quality comparison (psnr): >>> http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_quality.html >>> >>> - An Encode Speed comparison: >>> http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_speed.html >>> >>> - A comparison of the aggregate time required to decode all of the clip= s >>> in >>> the test: >>> http://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt >>> >>> All of our test scripts can either be downloaded from: >>> http://downloads.webmproject.org/ietf_tests/vp8_vs_h264.tar.xz >>> or checked out of our git/gerrit repository: >>> git clone http://git.chromium.org/webm/vpx_codec_comparison.git >>> >>> The file README.txt, contained within, presents details of how to build >>> and >>> run the tests. >>> >>> The compressed video files--the output from the quality tests--can also >>> be >>> downloaded: >>> >>> VP8: >>> http://downloads.webmproject.org/ietf_tests/vp8_videos/index.html >>> >>> H.264: >>> http://downloads.webmproject.org/ietf_tests/h264_videos/index.html >>> >>> Adrian Grange >>> >>> >>> >>> >>> >>> >>> >>> _______________________________________________ >>> rtcweb mailing list >>> rtcweb@ietf.org >>> https://www.ietf.org/mailman/listinfo/rtcweb >>> >>> >>> >>> >>> _______________________________________________ >>> rtcweb mailing list >>> rtcweb@ietf.org >>> https://www.ietf.org/mailman/listinfo/rtcweb >>> >>> >>> >>> _______________________________________________ >>> rtcweb mailing list >>> rtcweb@ietf.org >>> https://www.ietf.org/mailman/listinfo/rtcweb >>> > From ted.ietf@gmail.com Thu Apr 4 08:05:21 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0184E21F84B1 for ; Thu, 4 Apr 2013 08:05:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 11m2NCd+J9bV for ; Thu, 4 Apr 2013 08:05:20 -0700 (PDT) Received: from mail-ia0-x22f.google.com (mail-ia0-x22f.google.com [IPv6:2607:f8b0:4001:c02::22f]) by ietfa.amsl.com (Postfix) with ESMTP id 7E51621F84AF for ; Thu, 4 Apr 2013 08:05:20 -0700 (PDT) Received: by mail-ia0-f175.google.com with SMTP id e16so2281068iaa.6 for ; Thu, 04 Apr 2013 08:05:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:date:message-id:subject:from:to :content-type; bh=+xaZSO3lIyjzwhD08x7CRB7lY1NXe3ME1BCSPDaAzXk=; b=q3Pf1LhTAwgH+dwPxQywRo0sFByYUc6OnTnXKPB8wDEVECTZI1iFxY2eJ9I7Eug6Ln /3j3q4c/e7OD4AtK0SvXSQCFKK/aiZc+Os9bUJFDf355aRaIZveDnKDix9uBSh7WJo4Y eIp/+bmdZKOe0S62FE7e9GfkHx8Ln+XuR0AAS6MKYv2Z53H5qKL4EaAv14k9BxVuNhpf dQXu5N+TaTYPgVrYdISkA0fE9Ceud8aAqyl+9yx/eCeGhZeSbLmVfstQNf/RCPZhhfBL oV0t5BH3MaC3nxVcurZrJ5r1sOn9OW2IagSJ2g4icQciZd2rAK5523qeZpSfBygyNCtP adIQ== MIME-Version: 1.0 X-Received: by 10.50.134.4 with SMTP id pg4mr4111266igb.96.1365087920135; Thu, 04 Apr 2013 08:05:20 -0700 (PDT) Received: by 10.43.135.202 with HTTP; Thu, 4 Apr 2013 08:05:20 -0700 (PDT) Date: Thu, 4 Apr 2013 08:05:20 -0700 Message-ID: From: Ted Hardie To: rtcweb@ietf.org Content-Type: multipart/alternative; boundary=047d7b3a98b891777304d98a4c85 Subject: [rtcweb] Taxonomy draft X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 15:05:21 -0000 --047d7b3a98b891777304d98a4c85 Content-Type: text/plain; charset=ISO-8859-1 Folks may be aware that there have been some ongoing discussions on how to create common vocabulary for a set of core elements discussed in a swath of RAI area working groups. For those interested in following the work, the task has moved to AVTEXT; those interested in following the work should do so there. regards, Ted Hardie --047d7b3a98b891777304d98a4c85 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Folks may be aware that there have been some ongoing discussions on how to = create common vocabulary for a set of core elements discussed in a swath of= RAI area working groups.=A0 For those interested in following the work, th= e task has moved to AVTEXT; those interested in following the work should d= o so there.

regards,

Ted Hardie
--047d7b3a98b891777304d98a4c85-- From thdavies@cisco.com Thu Apr 4 08:05:41 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EDD0A21F8556 for ; Thu, 4 Apr 2013 08:05:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.598 X-Spam-Level: X-Spam-Status: No, score=-10.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lpco5RTEoTwE for ; Thu, 4 Apr 2013 08:05:36 -0700 (PDT) Received: from ams-iport-1.cisco.com (ams-iport-1.cisco.com [144.254.224.140]) by ietfa.amsl.com (Postfix) with ESMTP id D2C0D21F84CE for ; Thu, 4 Apr 2013 08:05:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=21102; q=dns/txt; s=iport; t=1365087936; x=1366297536; h=message-id:date:from:mime-version:to:subject:references: in-reply-to; bh=rbaqjb/x61yW1IwZz4niGUZHmYanYQSv7gOsRf2iKRk=; b=P8z3wRv/7EnrHQcmcLoWyuVZGDUIZWRHj+qGDP9xhMO/m07vpJgna88Y SF6AdjfKITlTMm6l0AAI7B0lxNM2ODCKlni+3NwxTRkOvxWXZ/l6+MxV0 BZ76G9GN8qvI0bGG2g3FzRcf9mwfPpIel6w21SpWZp368lvyrAR7sVv8y Q=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AikFAKKVXVGQ/khL/2dsb2JhbABDgkJENokGuAGBABZ0gh8BAQEEAQEBaAECCAIRCxgJFg8JAwIBAgEVMAcMBgIBAYgQDMEGjyKDQAOWboEghGKLC4MMOw X-IronPort-AV: E=Sophos;i="4.87,409,1363132800"; d="scan'208,217";a="152492969" Received: from ams-core-2.cisco.com ([144.254.72.75]) by ams-iport-1.cisco.com with ESMTP; 04 Apr 2013 15:05:33 +0000 Received: from [10.47.196.175] ([10.47.196.175]) by ams-core-2.cisco.com (8.14.5/8.14.5) with ESMTP id r34F5Vu3020966; Thu, 4 Apr 2013 15:05:32 GMT Message-ID: <515D96A2.1000602@cisco.com> Date: Thu, 04 Apr 2013 16:05:06 +0100 From: Thomas Davies Organization: Cisco Systems User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:11.0) Gecko/20120410 Thunderbird/11.0.1 MIME-Version: 1.0 To: harald@alvestrand.no, rtcweb@ietf.org References: <515D3FA1.6050305@gmail.com> In-Reply-To: <515D3FA1.6050305@gmail.com> Content-Type: multipart/alternative; boundary="------------010801090409010400000800" Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 15:05:41 -0000 This is a multi-part message in MIME format. --------------010801090409010400000800 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Harald, I think there are quite a few problems with the comparison you have posted. 1. Looking at the sequences there is a very major difference between the initial intra frame qualities. When I encode just one frame of sequence gipsrecomotion using the parameters in the script at 1Mb/s then the intra frame is 3 times larger with vp8 than with x264. With video conferencing content, the quality of the initial I frame has a big impact that can last for many seconds - certainly the length of these clips. You can easily get gains by increasing the quality difference between an I frame and subsequent frames. x264 seems to have a policy of initially undershooting the bitrate substantially and ramping up, whereas vpxenc has a different approach. During this ramp up period the quality is very much worse. I can't find a way to persuade x264 to behave differently. This is a good illustration of why including rate control in comparisons is a bad idea. 2. Likewise, looking at the individual frame sizes, it seems vpxenc is using a quality hierarchy with a length of 8 ("hiercharchical-P") where every 8th frame is about 4x bigger than the others. x264 has a constant target per frame. Hierarchical P frames are a really good idea, and can easily get you 10-20% gain with a big separation like this, at a cost in latency. Again I don't know how to make x264 do this, but the technique is applicable to any codec and is used in the JM reference. 3. The x264 settings are a bit of a black art, but appear not to be ideal after all. I am definitely no expert but I found that when encoding gipsrecomotion at 1Mb/s: - setting --threads 1 improves quality by a full 1dB (vpxenc seems to run single threaded by default) - reducing the number of references from 3 to 2 (--ref 2) reduces the load very substantially at very little loss (0.2dB or so). So with --threads 1 --ref 2, I found x264 ran more than 2x faster than vpxenc for this data point and had much better quality than before. vpxenc is still better (about 1dB), but very possibly within the range of hierarchical P coding improvements. Incidentally, I don't think that x264 performs particularly well at these high complexity settings, at least for video conferencing, no doubt as other more practical settings have been targeted. x264 appears to have a quality ceiling that the JM does not have. 4. Another (smaller) issue is that the reported PSNR is combined luma and chroma over all frames. It's relatively easy to improve chroma PSNR at a small cost in bits, and usually it is best to ignore chroma PSNR or (possibly) give it a small weight. The arithmetic mean of frame PSNRs is generally used rather than the PSNR of the whole sequence, also. I would very much like separate component PSNRs in tests. The figures I quote above are luma PSNR. If the purpose is to show whether vp8 is superior as a *technology* to h264 CBP, then I think the comparison should use the best settings you have (ideally with a special full-on non-real time implementation) and test against the JM reference encoder. Ideally you would use the same or similar GOP structures, number of references, prediction and QP hierarchies. Comparing different real-time implementations of different codecs trying to do high quality coding with different GOP structures and using rate control with different strategies is just a waste of time. The first two elements in the list above are alone worth a very significant amount of bit rate. On the other hand, a quick perusal of the actual tools would suggest that vp8 and h264 CBP are likely "comparable" and the variation between implementations of the same technology would be bigger than the variation between the technologies. If we could agree that then a lot of time could be saved. best regards Thomas On 04/04/13 09:53, Sergio Garcia Murillo wrote: > Hi Adrian, > > Could you explain how the encoding parametrization is comparable? > > x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \ > --vbv-init 0.8 --bitrate ${rate} --fps ${frame_rate} \ > --profile baseline --no-scenecut --keyint infinite --preset > veryslow \ > --input-res ${width}x${height} \ > --tune psnr \ > -o ./encoded_clips/h264/${clip_stem}_${rate}kbps.mkv ${filename} \ > 2> ./logs/h264/${clip_stem}_${rate}kbps.txt > > vs: > > ./bin/vpxenc --lag-in-frames=0 --target-bitrate=${rate} > --kf-min-dist=3000 \ > --kf-max-dist=3000 --cpu-used=0 --fps=${frame_rate}/1 > --static-thresh=0 \ > --token-parts=1 --drop-frame=0 --end-usage=cbr --min-q=2 > --max-q=56 \ > --undershoot-pct=100 --overshoot-pct=15 --buf-sz=1000 \ > --buf-initial-sz=800 --buf-optimal-sz=1000 --max-intra-rate=1200 \ > --resize-allowed=0 --drop-frame=0 --passes=1 --good > --noise-sensitivity=0 \ > -w ${width} -h ${height} ${filename} --codec=vp8 \ > -o ./encoded_clips/vp8/${clip_stem}_${rate}kbps.webm \ > &>./logs/vp8/${clip_stem}_${rate}kbps.txt > > Best regards > Sergio > > El 03/04/2013 18:20, Adrian Grange escribió: >> We have uploaded a new set of test results comparing VP8 to H.264. >> This latest set contains fixes for some of the problems in the >> previous set. We would like to extend our thanks to those who made >> suggestions as to how we could improve our methodology and encourage >> suggestions as to how we can make further improvements. >> >> In these tests we run x264 with the "veryslow" preset and VP8 with >> the "good, speed 0" setting in an attempt to produce comparable results. >> >> An overview of our results is available as follows: >> >> - A Quality comparison (psnr): >> http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_quality.html >> >> - An Encode Speed comparison: >> http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_speed.html >> >> - A comparison of the aggregate time required to decode all of the >> clips in the test: >> http://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt >> >> All of our test scripts can either be downloaded from: >> http://downloads.webmproject.org/ietf_tests/vp8_vs_h264.tar.xz >> or checked out of our git/gerrit repository: >> git clone http://git.chromium.org/webm/vpx_codec_comparison.git >> >> The file README.txt, contained within, presents details of how to >> build and run the tests. >> >> The compressed video files--the output from the quality tests--can >> also be downloaded: >> >> VP8: >> http://downloads.webmproject.org/ietf_tests/vp8_videos >> /index.html >> >> H.264: >> http://downloads.webmproject.org/ietf_tests/h264_videos/index.html >> >> Adrian Grange >> >> >> >> >> >> >> >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb > > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb --------------010801090409010400000800 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Harald,

I think there are quite a few problems with the comparison you have posted.

1. Looking at the sequences there is a very major difference between the initial intra frame qualities. When I encode just one frame of sequence gipsrecomotion using the parameters in the script at 1Mb/s then the intra frame is 3 times larger with vp8 than with x264.

With video conferencing content, the quality of the initial I frame has a big impact that can last for many seconds - certainly the length of these clips. You can easily get gains by increasing the quality difference between an I frame and subsequent frames.

x264 seems to have a policy of initially undershooting the bitrate substantially and ramping up, whereas vpxenc has a different approach. During this ramp up period the quality is very much worse. I can't find a way to persuade x264 to behave differently.

This is a good illustration of why including rate control in comparisons is a bad idea.

2. Likewise, looking at the individual frame sizes, it seems vpxenc is using a quality hierarchy with a length of 8 ("hiercharchical-P") where every 8th frame is about 4x bigger than the others. x264 has a constant target per frame.

Hierarchical P frames are a really good idea, and can easily get you 10-20% gain with a big separation like this, at a cost in latency. Again I don't know how to make x264 do this, but the technique is applicable to any codec and is used in the JM reference.

3. The x264 settings are a bit of a black art, but appear not to be ideal after all. I am definitely no expert but I found that when encoding gipsrecomotion at 1Mb/s:

- setting --threads 1 improves quality by a full 1dB (vpxenc seems to run single threaded by default)
- reducing the number of references from 3 to 2 (--ref 2) reduces the load very substantially at very little loss (0.2dB or so).

So with --threads 1 --ref 2, I found x264 ran more than 2x faster than vpxenc for this data point and had much better quality than before. vpxenc is still better (about 1dB), but very possibly within the range of hierarchical P coding improvements.
 
Incidentally, I don't think that x264 performs particularly well at these high complexity settings, at least for video conferencing, no doubt as other more practical settings have been targeted. x264 appears to have a quality ceiling that the JM does not have.

4. Another (smaller) issue is that the reported PSNR is combined luma and chroma over all frames. It's relatively easy to improve chroma PSNR at a small cost in bits, and usually it is best to ignore chroma PSNR or (possibly) give it a small weight. The arithmetic mean of frame PSNRs is generally used rather than the PSNR of the whole sequence, also. I would very much like separate component PSNRs in tests. The figures I quote above are luma PSNR.

If the purpose is to show whether vp8 is superior as a *technology* to h264 CBP, then I think the comparison should use the best settings you have (ideally with a special full-on non-real time implementation) and test against the JM reference encoder. Ideally you would use the same or similar GOP structures, number of references, prediction and QP hierarchies.

Comparing different real-time implementations of different codecs trying to do high quality coding with different GOP structures and using rate control with different strategies is just a waste of time. The first two elements in the list above are alone worth a very significant amount of bit rate.

On the other hand, a quick perusal of the actual tools would suggest that vp8 and h264 CBP are likely "comparable" and the variation between implementations of the same technology would be bigger than the variation between the technologies. If we could agree that then a lot of time could be saved.

best regards

Thomas




On 04/04/13 09:53, Sergio Garcia Murillo wrote:
Hi Adrian,

Could you explain how the encoding parametrization is comparable?

x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \
      --vbv-init 0.8 --bitrate ${rate} --fps ${frame_rate} \
      --profile baseline --no-scenecut --keyint infinite --preset veryslow \
      --input-res ${width}x${height} \
      --tune psnr \
      -o ./encoded_clips/h264/${clip_stem}_${rate}kbps.mkv ${filename} \
      2> ./logs/h264/${clip_stem}_${rate}kbps.txt

vs:

 ./bin/vpxenc --lag-in-frames=0 --target-bitrate=${rate} --kf-min-dist=3000 \
      --kf-max-dist=3000 --cpu-used=0 --fps=${frame_rate}/1 --static-thresh=0 \
      --token-parts=1 --drop-frame=0 --end-usage=cbr --min-q=2 --max-q=56 \
      --undershoot-pct=100 --overshoot-pct=15 --buf-sz=1000 \
      --buf-initial-sz=800 --buf-optimal-sz=1000 --max-intra-rate=1200 \
      --resize-allowed=0 --drop-frame=0 --passes=1 --good --noise-sensitivity=0 \
      -w ${width} -h ${height} ${filename} --codec=vp8 \
      -o ./encoded_clips/vp8/${clip_stem}_${rate}kbps.webm \
      &>./logs/vp8/${clip_stem}_${rate}kbps.txt

Best regards
Sergio

El 03/04/2013 18:20, Adrian Grange escribió:
We have uploaded a new set of test results comparing VP8 to H.264. This latest set contains fixes for some of the problems in the previous set. We would like to extend our thanks to those who made suggestions as to how we could improve our methodology and encourage suggestions as to how we can make further improvements.

In these tests we run x264 with the "veryslow" preset and VP8 with the "good, speed 0" setting in an attempt to produce comparable results.

An overview of our results is available as follows:



- A comparison of the aggregate time required to decode all of the clips in the test: http://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt

All of our test scripts can either be downloaded from:
or checked out of our git/gerrit repository:

The file README.txt, contained within, presents details of how to build and run the tests.

The compressed video files--the output from the quality tests--can also be downloaded:






_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
https://www.ietf.org/mailman/listinfo/rtcweb




_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
https://www.ietf.org/mailman/listinfo/rtcweb


--------------010801090409010400000800-- From matthew@matthew.at Thu Apr 4 08:08:49 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1D2A821F8BC0 for ; Thu, 4 Apr 2013 08:08:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.43 X-Spam-Level: X-Spam-Status: No, score=-1.43 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_AT=0.424, HOST_EQ_AT=0.745] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oWj5bhfLuXSQ for ; Thu, 4 Apr 2013 08:08:48 -0700 (PDT) Received: from where.matthew.at (where.matthew.at [198.202.199.1]) by ietfa.amsl.com (Postfix) with ESMTP id B14DF21F8BBC for ; Thu, 4 Apr 2013 08:08:48 -0700 (PDT) Received: from [10.10.155.229] (unknown [10.10.155.229]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by where.matthew.at (Postfix) with ESMTP id 784D6230005 for ; Thu, 4 Apr 2013 08:08:46 -0700 (PDT) Message-ID: <515D977C.6080501@matthew.at> Date: Thu, 04 Apr 2013 08:08:44 -0700 From: Matthew Kaufman User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:17.0) Gecko/20130107 Thunderbird/17.0.2 MIME-Version: 1.0 To: rtcweb@ietf.org References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 15:08:49 -0000 On 4/3/2013 9:20 AM, Adrian Grange wrote: > We have uploaded a new set of test results comparing VP8 to H.264. Why? Is there really anyone on the list who is making a decision based on perceived quality? And if so, would they care what anyone's tests other than their own showed? Matthew Kaufman From adam@nostrum.com Thu Apr 4 08:23:23 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D6D9921F8BD5 for ; Thu, 4 Apr 2013 08:23:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.6 X-Spam-Level: X-Spam-Status: No, score=-102.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, SPF_PASS=-0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Bd+8qQUyw2za for ; Thu, 4 Apr 2013 08:23:22 -0700 (PDT) Received: from shaman.nostrum.com (nostrum-pt.tunnel.tserv2.fmt.ipv6.he.net [IPv6:2001:470:1f03:267::2]) by ietfa.amsl.com (Postfix) with ESMTP id 16A0721F8BA4 for ; Thu, 4 Apr 2013 08:23:21 -0700 (PDT) Received: from Orochi.local (99-152-144-32.lightspeed.dllstx.sbcglobal.net [99.152.144.32]) (authenticated bits=0) by shaman.nostrum.com (8.14.3/8.14.3) with ESMTP id r34FNKwE035563 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO); Thu, 4 Apr 2013 10:23:20 -0500 (CDT) (envelope-from adam@nostrum.com) Message-ID: <515D9AE7.4050608@nostrum.com> Date: Thu, 04 Apr 2013 10:23:19 -0500 From: Adam Roach User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: Matthew Kaufman References: <515D977C.6080501@matthew.at> In-Reply-To: <515D977C.6080501@matthew.at> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass (shaman.nostrum.com: 99.152.144.32 is authenticated by a trusted mechanism) Cc: rtcweb@ietf.org Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 15:23:23 -0000 On 4/4/13 10:08, Matthew Kaufman wrote: > And if so, would they care what anyone's tests other than their own > showed? I for one, applaud the approach of publishing the exact tools and options used for encoding. Without that kind of transparency, it becomes very difficult to trust purported output. It's a "many eyes" approach to finding flaws with the comparisons thet goes a long way towards preventing claims of tester bias. I do find it a bit odd that, although we've had proponents of both solutions show what they purport to be output of the codecs, the only "don't take my word for it, replicate my results at home on your own machine" transparency I've seen has been from the VP8 camp. /a From petithug@acm.org Thu Apr 4 09:14:48 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5A95F21F942D for ; Thu, 4 Apr 2013 09:14:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.1 X-Spam-Level: X-Spam-Status: No, score=-102.1 tagged_above=-999 required=5 tests=[AWL=-0.500, BAYES_00=-2.599, GB_AFFORDABLE=1, NO_RELAYS=-0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0PHMLCiNU+40 for ; Thu, 4 Apr 2013 09:14:47 -0700 (PDT) Received: from implementers.org (implementers.org [IPv6:2604:3400:dc1:41:216:3eff:fe5b:8240]) by ietfa.amsl.com (Postfix) with ESMTP id 8F18E21F9653 for ; Thu, 4 Apr 2013 09:14:46 -0700 (PDT) Received: from [IPv6:2601:9:4bc0:1f:3956:8dd9:a1c4:336] (unknown [IPv6:2601:9:4bc0:1f:3956:8dd9:a1c4:336]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client CN "Marc Petit-Huguenin", Issuer "implementers.org" (verified OK)) by implementers.org (Postfix) with ESMTPS id 1547020453; Thu, 4 Apr 2013 18:14:44 +0200 (CEST) Message-ID: <515DA6F2.9020209@acm.org> Date: Thu, 04 Apr 2013 09:14:42 -0700 From: Marc Petit-Huguenin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.12) Gecko/20130116 Icedove/10.0.12 MIME-Version: 1.0 To: Adam Roach References: <515D977C.6080501@matthew.at> <515D9AE7.4050608@nostrum.com> In-Reply-To: <515D9AE7.4050608@nostrum.com> X-Enigmail-Version: 1.4.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: rtcweb@ietf.org Subject: [rtcweb] Fundamental asymmetry [was Re: New VP8 vs H.264 tests uploaded] X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 16:14:48 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On 04/04/2013 08:23 AM, Adam Roach wrote: > On 4/4/13 10:08, Matthew Kaufman wrote: >> And if so, would they care what anyone's tests other than their own >> showed? > > I for one, applaud the approach of publishing the exact tools and options > used for encoding. Without that kind of transparency, it becomes very > difficult to trust purported output. It's a "many eyes" approach to finding > flaws with the comparisons thet goes a long way towards preventing claims > of tester bias. > > I do find it a bit odd that, although we've had proponents of both > solutions show what they purport to be output of the codecs, the only > "don't take my word for it, replicate my results at home on your own > machine" transparency I've seen has been from the VP8 camp. > That shows that there is a fundamental asymmetry between the VP8 camp and the H.264. It is nice to see technical comparisons like this one - and more of them are needed - but a more important discussion, in my opinion, should be about the fact that the VP8 camp is fundamentally about inclusiveness and the H.264 camp about exclusiveness. Cullen's comment in the meeting about the fact that there is only 4 browsers and that they all but Mozilla have a fully paid license for H.264 is symptomatic of the blindness of the H.264 camp to the need of the RTCWeb/Webrtc community at large. OTOH, the VP8 camp consistently demonstrated, as with the OP email, willingness to work with the community and make RTCWeb/Webrtc available and affordable to the whole spectrum of participants. As an independent developer, I do not need to look at the results of the tests to choose my camp. - -- Marc Petit-Huguenin Email: marc@petit-huguenin.org Blog: http://blog.marc.petit-huguenin.org Profile: http://www.linkedin.com/in/petithug -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBCAAGBQJRXabwAAoJECnERZXWan7EYlIQAJjfdocrPpiPNqjQJgG4OpxP lYE62oFsooJBP4a8hI0uxNFLMWLs/DsZC9LSYxXlvjWEs5kriOYrR48zWQHGuDQR W9VWepdHPrgrRTdh67nn0pxILj7zMhDahaeFonPxO9luvzX/1H76DLfXJ/glW1zv 6KBqqUhriHEb4IPN/f1VQ5Xpw5OQoD912/2wimkbzRjBeoDeHZ2olKLYEvpmiOQL /AYCe+xBi7Rr9ciJVksQ1JY2lL67RnKBP/23AYRlN0xNLnGnhafG7OIbBpMLWfCm qU7mdTZtyoz3IxnyLEC4eqQT7pI+rysA4yC2ormJkAbsJbw7qI10U8fzyZkfdPyn uOcVGwKdxjcQgJd1Z7F5QhgbWIAo3EuTIZ3Poa56oIPG4YQJ9dh66Iw8EIfh2GGh r6kYBY+uCkdwALcpa5Cp0iiB4NmmhzWfBVoGurkby2dX2sXh+nKAFPYaKI2vdYDw KfPkOPD2i9dzlEB867nLqzw1hElFvaW0PJAu+9RHuVLUlEda7XVIOCZYgBvy0R9n TZbkkCpJrcr9vD0g8ORSTx3uAUJF0z7c85++HpDD/YwmccQzyhVMuD6YPREtyim+ 9MtmluiI8ta6XEF9Q26KpCjg7Q0uLHhZEhS4jDEXFS3bDi1/bbM/Bw7tuiLAV2cC Y4OvDTukQl0GHTdMCOP6 =gcyM -----END PGP SIGNATURE----- From lgeyser@gmail.com Thu Apr 4 09:55:36 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F249421F8C66 for ; Thu, 4 Apr 2013 09:55:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vhZogJU2KFoT for ; Thu, 4 Apr 2013 09:55:33 -0700 (PDT) Received: from mail-la0-x22d.google.com (mail-la0-x22d.google.com [IPv6:2a00:1450:4010:c03::22d]) by ietfa.amsl.com (Postfix) with ESMTP id 4C4C221F9393 for ; Thu, 4 Apr 2013 09:55:31 -0700 (PDT) Received: by mail-la0-f45.google.com with SMTP id er20so2719099lab.32 for ; Thu, 04 Apr 2013 09:55:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=c0DesJAEVFX8MmK0w/j94UqbDjgGVzQYV2otvVbmrRQ=; b=Z1wD1k+IxcK7PVVTaU38DM3T0JCkTbaxIhrHImBYmVun+QKqQFnICX7TVjvrCz+gtu HGSYzH+6EeH3Q+TEfjX6LtmyU0IC90o61qCmqkExabai3CJ7Q+/BES9rRyLw5GMj6wkW 78PszPiSdMz9qDHKNutk8Ek+HdgRCrsytkB3Y+hdQHILqLX7RKOfJ6pBkPEjN62+428B rd/ZUekITYZVn0XpiOWX3h8SJhZ64exUjqZ7bY17ZTkPL8Jiog9VVYiMFD7egEV09mZ4 MHxkDWxjhIVKJla3ZqTns5V/EyrWhi5WaZ5f/o7Men+94lYuq0D7AHCmN45vj+fwZ6R7 0flA== MIME-Version: 1.0 X-Received: by 10.112.4.10 with SMTP id g10mr3985959lbg.41.1365094530906; Thu, 04 Apr 2013 09:55:30 -0700 (PDT) Received: by 10.114.177.42 with HTTP; Thu, 4 Apr 2013 09:55:30 -0700 (PDT) In-Reply-To: <515D96A2.1000602@cisco.com> References: <515D3FA1.6050305@gmail.com> <515D96A2.1000602@cisco.com> Date: Thu, 4 Apr 2013 18:55:30 +0200 Message-ID: From: Leon Geyser To: Thomas Davies Content-Type: multipart/alternative; boundary=14dae94ed9a39983a504d98bd694 Cc: rtcweb@ietf.org Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 16:55:36 -0000 --14dae94ed9a39983a504d98bd694 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable > > If the purpose is to show whether vp8 is superior as a *technology* to > h264 CBP, then I think the comparison should use the best settings you ha= ve > (ideally with a special full-on non-real time implementation) and test > against the JM reference encoder. Ideally you would use the same or simil= ar > GOP structures, number of references, prediction and QP hierarchies. > I thought WebRTC was meant for real-time communication. What would it benefit us if we test settings that won't be used or can't be used in practice? The tests need to test the encoders at realtime/low latency and at a constrained bitrate mode like CBR. We aren't archiving videos here :) A graph that shows the bitrate over time for each clip could be usefull to make sure that no encoder spikes the bitrate too high at certain moments. I welcome changes to the encoder settings as long as they stay realtime/low latency and constrained bitrate. On 4 April 2013 17:05, Thomas Davies wrote: > Harald, > > I think there are quite a few problems with the comparison you have poste= d. > > 1. Looking at the sequences there is a very major difference between the > initial intra frame qualities. When I encode just one frame of sequence > gipsrecomotion using the parameters in the script at 1Mb/s then the intra > frame is 3 times larger with vp8 than with x264. > > With video conferencing content, the quality of the initial I frame has a > big impact that can last for many seconds - certainly the length of these > clips. You can easily get gains by increasing the quality difference > between an I frame and subsequent frames. > > x264 seems to have a policy of initially undershooting the bitrate > substantially and ramping up, whereas vpxenc has a different approach. > During this ramp up period the quality is very much worse. I can't find a > way to persuade x264 to behave differently. > > This is a good illustration of why including rate control in comparisons > is a bad idea. > > 2. Likewise, looking at the individual frame sizes, it seems vpxenc is > using a quality hierarchy with a length of 8 ("hiercharchical-P") where > every 8th frame is about 4x bigger than the others. x264 has a constant > target per frame. > > Hierarchical P frames are a really good idea, and can easily get you > 10-20% gain with a big separation like this, at a cost in latency. Again = I > don't know how to make x264 do this, but the technique is applicable to a= ny > codec and is used in the JM reference. > > 3. The x264 settings are a bit of a black art, but appear not to be ideal > after all. I am definitely no expert but I found that when encoding > gipsrecomotion at 1Mb/s: > > - setting --threads 1 improves quality by a full 1dB (vpxenc seems to run > single threaded by default) > - reducing the number of references from 3 to 2 (--ref 2) reduces the loa= d > very substantially at very little loss (0.2dB or so). > > So with --threads 1 --ref 2, I found x264 ran more than 2x faster than > vpxenc for this data point and had much better quality than before. vpxen= c > is still better (about 1dB), but very possibly within the range of > hierarchical P coding improvements. > > Incidentally, I don't think that x264 performs particularly well at these > high complexity settings, at least for video conferencing, no doubt as > other more practical settings have been targeted. x264 appears to have a > quality ceiling that the JM does not have. > > 4. Another (smaller) issue is that the reported PSNR is combined luma and > chroma over all frames. It's relatively easy to improve chroma PSNR at a > small cost in bits, and usually it is best to ignore chroma PSNR or > (possibly) give it a small weight. The arithmetic mean of frame PSNRs is > generally used rather than the PSNR of the whole sequence, also. I would > very much like separate component PSNRs in tests. The figures I quote abo= ve > are luma PSNR. > > If the purpose is to show whether vp8 is superior as a *technology* to > h264 CBP, then I think the comparison should use the best settings you ha= ve > (ideally with a special full-on non-real time implementation) and test > against the JM reference encoder. Ideally you would use the same or simil= ar > GOP structures, number of references, prediction and QP hierarchies. > > Comparing different real-time implementations of different codecs trying > to do high quality coding with different GOP structures and using rate > control with different strategies is just a waste of time. The first two > elements in the list above are alone worth a very significant amount of b= it > rate. > > On the other hand, a quick perusal of the actual tools would suggest that > vp8 and h264 CBP are likely "comparable" and the variation between > implementations of the same technology would be bigger than the variation > between the technologies. If we could agree that then a lot of time could > be saved. > > best regards > > Thomas > > > > > On 04/04/13 09:53, Sergio Garcia Murillo wrote: > > Hi Adrian, > > Could you explain how the encoding parametrization is comparable? > > x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \ > --vbv-init 0.8 --bitrate ${rate} --fps ${frame_rate} \ > --profile baseline --no-scenecut --keyint infinite --preset veryslo= w > \ > --input-res ${width}x${height} \ > --tune psnr \ > -o ./encoded_clips/h264/${clip_stem}_${rate}kbps.mkv ${filename} \ > 2> ./logs/h264/${clip_stem}_${rate}kbps.txt > > vs: > > ./bin/vpxenc --lag-in-frames=3D0 --target-bitrate=3D${rate} > --kf-min-dist=3D3000 \ > --kf-max-dist=3D3000 --cpu-used=3D0 --fps=3D${frame_rate}/1 > --static-thresh=3D0 \ > --token-parts=3D1 --drop-frame=3D0 --end-usage=3Dcbr --min-q=3D2 --= max-q=3D56 > \ > --undershoot-pct=3D100 --overshoot-pct=3D15 --buf-sz=3D1000 \ > --buf-initial-sz=3D800 --buf-optimal-sz=3D1000 --max-intra-rate=3D1= 200 \ > --resize-allowed=3D0 --drop-frame=3D0 --passes=3D1 --good > --noise-sensitivity=3D0 \ > -w ${width} -h ${height} ${filename} --codec=3Dvp8 \ > -o ./encoded_clips/vp8/${clip_stem}_${rate}kbps.webm \ > &>./logs/vp8/${clip_stem}_${rate}kbps.txt > > Best regards > Sergio > > El 03/04/2013 18:20, Adrian Grange escribi=F3: > > We have uploaded a new set of test results comparing VP8 to H.264. This > latest set contains fixes for some of the problems in the previous set. W= e > would like to extend our thanks to those who made suggestions as to how w= e > could improve our methodology and encourage suggestions as to how we can > make further improvements. > > In these tests we run x264 with the "veryslow" preset and VP8 with the > "good, speed 0" setting in an attempt to produce comparable results. > > An overview of our results is available as follows: > > - A Quality comparison (psnr): > http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_quality.html > > - An Encode Speed comparison: > http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_speed.html > > - A comparison of the aggregate time required to decode all of the clips > in the test: > http://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt > > All of our test scripts can either be downloaded from: > http://downloads.webmproject.org/ietf_tests/vp8_vs_h264.tar.xz > or checked out of our git/gerrit repository: > git clone http://git.chromium.org/webm/vpx_codec_comparison.git > > The file README.txt, contained within, presents details of how to build > and run the tests. > > The compressed video files--the output from the quality tests--can also > be downloaded: > > VP8: > http://downloads.webmproject.org/ietf_tests/vp8_videos/index.html > > H.264: > http://downloads.webmproject.org/ietf_tests/h264_videos/index.html > > Adrian Grange > > > > > > > > _______________________________________________ > rtcweb mailing listrtcweb@ietf.orghttps://www.ietf.org/mailman/listinfo/r= tcweb > > > > > _______________________________________________ > rtcweb mailing listrtcweb@ietf.orghttps://www.ietf.org/mailman/listinfo/r= tcweb > > > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > > --14dae94ed9a39983a504d98bd694 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
If the purpose is to show= whether vp8 is superior as a *technology* to h264 CBP, then I think the comparison should use the best settings you have (ideally with a special full-on non-real time implementation) and test against the JM reference encoder. Ideally you would use the same or similar GOP structures, number of references, prediction and QP hierarchies.
I thou= ght WebRTC was meant for real-time communication. What would it benefit us = if we test settings that won't be used or can't be used in practice= ?

The tests need to test the encoders at realtime/low latency and at a co= nstrained bitrate mode like CBR. We aren't archiving videos here :)
=
A graph that shows the bitrate over time for each clip could be usefull= to make sure that no encoder spikes the bitrate too high at certain moment= s.
I welcome changes to the encoder settings as long as they stay realtime/low= latency and constrained bitrate.
=A0
On= 4 April 2013 17:05, Thomas Davies <thdavies@cisco.com> wro= te:
=20 =20 =20
Harald,

I think there are quite a few problems with the comparison you have posted.

1. Looking at the sequences there is a very major difference between the initial intra frame qualities. When I encode just one frame of sequence gipsrecomotion using the parameters in the script at 1Mb/s then the intra frame is 3 times larger with vp8 than with x264.

With video conferencing content, the quality of the initial I frame has a big impact that can last for many seconds - certainly the length of these clips. You can easily get gains by increasing the quality difference between an I frame and subsequent frames.

x264 seems to have a policy of initially undershooting the bitrate substantially and ramping up, whereas vpxenc has a different approach. During this ramp up period the quality is very much worse. I can't find a way to persuade x264 to behave differently.

This is a good illustration of why including rate control in comparisons is a bad idea.

2. Likewise, looking at the individual frame sizes, it seems vpxenc is using a quality hierarchy with a length of 8 ("hiercharchical-P= ") where every 8th frame is about 4x bigger than the others. x264 has a constant target per frame.

Hierarchical P frames are a really good idea, and can easily get you 10-20% gain with a big separation like this, at a cost in latency. Again I don't know how to make x264 do this, but the technique is applicable to any codec and is used in the JM reference.

3. The x264 settings are a bit of a black art, but appear not to be ideal after all. I am definitely no expert but I found that when encoding gipsrecomotion at 1Mb/s:

- setting --threads 1 improves quality by a full 1dB (vpxenc seems to run single threaded by default)
- reducing the number of references from 3 to 2 (--ref 2) reduces the load very substantially at very little loss (0.2dB or so).

So with --threads 1 --ref 2, I found x264 ran more than 2x faster than vpxenc for this data point and had much better quality than before. vpxenc is still better (about 1dB), but very possibly within the range of hierarchical P coding improvements.
=A0
Incidentally, I don't think that x264 performs particularly well at these high complexity settings, at least for video conferencing, no doubt as other more practical settings have been targeted. x264 appears to have a quality ceiling that the JM does not have.

4. Another (smaller) issue is that the reported PSNR is combined luma and chroma over all frames. It's relatively easy to improve chroma PSNR at a small cost in bits, and usually it is best to ignore chroma PSNR or (possibly) give it a small weight. The arithmetic mean of frame PSNRs is generally used rather than the PSNR of the whole sequence, also. I would very much like separate component PSNRs in tests. The figures I quote above are luma PSNR.

If the purpose is to show whether vp8 is superior as a *technology* to h264 CBP, then I think the comparison should use the best settings you have (ideally with a special full-on non-real time implementation) and test against the JM reference encoder. Ideally you would use the same or similar GOP structures, number of references, prediction and QP hierarchies.

Comparing different real-time implementations of different codecs trying to do high quality coding with different GOP structures and using rate control with different strategies is just a waste of time. The first two elements in the list above are alone worth a very significant amount of bit rate.

On the other hand, a quick perusal of the actual tools would suggest that vp8 and h264 CBP are likely "comparable" and the variati= on between implementations of the same technology would be bigger than the variation between the technologies. If we could agree that then a lot of time could be saved.

best regards

Thomas




On 04/04/13 09:53, Sergio Garcia Murillo wrote:
=20
Hi Adrian,

Could you explain how the encoding parametrization is comparable?

x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \
=A0=A0=A0=A0=A0 --vbv-init 0.8 --bitrate ${rate} --fps ${frame_rate= } \
=A0=A0=A0=A0=A0 --profile baseline --no-scenecut --keyint infinite --preset veryslow \
=A0=A0=A0=A0=A0 --input-res ${width}x${height} \
=A0=A0=A0=A0=A0 --tune psnr \
=A0=A0=A0=A0=A0 -o ./encoded_clips/h264/${clip_stem}_${rate}kbps.mk= v ${filename} \
=A0=A0=A0=A0=A0 2> ./logs/h264/${clip_stem}_${rate}kbps.txt

vs:

=A0./bin/vpxenc --lag-in-frames=3D0 --target-bitrate=3D${rate} --kf-min-dist=3D3000 \
=A0=A0=A0=A0=A0 --kf-max-dist=3D3000 --cpu-used=3D0 --fps=3D${frame= _rate}/1 --static-thresh=3D0 \
=A0=A0=A0=A0=A0 --token-parts=3D1 --drop-frame=3D0 --end-usage=3Dcb= r --min-q=3D2 --max-q=3D56 \
=A0=A0=A0=A0=A0 --undershoot-pct=3D100 --overshoot-pct=3D15 --buf-s= z=3D1000 \
=A0=A0=A0=A0=A0 --buf-initial-sz=3D800 --buf-optimal-sz=3D1000 --max-intra-rate=3D1200 \
=A0=A0=A0=A0=A0 --resize-allowed=3D0 --drop-frame=3D0 --passes=3D1 = --good --noise-sensitivity=3D0 \
=A0=A0=A0=A0=A0 -w ${width} -h ${height} ${filename} --codec=3Dvp8 = \
=A0=A0=A0=A0=A0 -o ./encoded_clips/vp8/${clip_stem}_${rate}kbps.web= m \
=A0=A0=A0=A0=A0 &>./logs/vp8/${clip_stem}_${rate}kbps.txt
Best regards
Sergio

El 03/04/2013 18:20, Adrian Grange escribi=F3:
We have uploaded a new set of test results comparing VP8 to H.264. This latest set contains fixes for some of the problems in the previous set. We would like to extend our thanks to those who made suggestions as to how we could improve our methodology and encourage suggestions as to how we can make further improvements.

In these tests we run x264 with the "veryslow" preset and VP8 with the "good, speed 0" setting in = an attempt to produce comparable results.

An overview of our results is available as follows:
- A comparison of the aggregate time required to decode all of the clips in the test:=A0htt= p://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt

All of our test scripts=A0can either be downloaded from:
or checked out of our git/gerrit repository:
git clone http://git.chromium.org/webm/vpx_codec_comparison.git

The file README.txt, contained within, presents details of how to build and run the tests.

The compressed video files--the output from the quality tests--can also be downloaded:






_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
=
https://www.ietf.org/mailman/listinfo/rtcweb




_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
=
https://www.ietf.org/mailman/listinfo/rtcweb



_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
= https://www.ietf.org/mailman/listinfo/rtcweb


--14dae94ed9a39983a504d98bd694-- From radhika.r.roy.civ@mail.mil Thu Apr 4 10:02:58 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 13D0121F8F43 for ; Thu, 4 Apr 2013 10:02:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ys-BxCTlWyBC for ; Thu, 4 Apr 2013 10:02:57 -0700 (PDT) Received: from edge-cols.mail.mil (edge-cols.mail.mil [131.64.100.6]) by ietfa.amsl.com (Postfix) with ESMTP id 445C821F8F03 for ; Thu, 4 Apr 2013 10:02:56 -0700 (PDT) Received: from UCOLHP3Q.easf.csd.disa.mil (131.64.100.156) by UCOLHP4Z.easf.csd.disa.mil (131.64.100.6) with Microsoft SMTP Server (TLS) id 14.2.309.2; Thu, 4 Apr 2013 17:02:46 +0000 Received: from UCOLHP9B.easf.csd.disa.mil ([169.254.10.116]) by UCOLHP3Q.easf.csd.disa.mil ([131.64.100.156]) with mapi id 14.03.0123.003; Thu, 4 Apr 2013 17:02:44 +0000 From: "Roy, Radhika R CIV USARMY (US)" To: Leon Geyser , Thomas Davies Thread-Topic: [rtcweb] New VP8 vs H.264 tests uploaded (UNCLASSIFIED) Thread-Index: AQHOMUYMTI22SrfPpk2Gq2sQBPgFY5jGR+EAgAAAziA= Date: Thu, 4 Apr 2013 17:02:43 +0000 Message-ID: <8486C8728176924BAF5BDB2F7D7EEDDF49A706CD@ucolhp9b.easf.csd.disa.mil> References: <515D3FA1.6050305@gmail.com> <515D96A2.1000602@cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [131.64.62.4] Content-Type: multipart/signed; micalg=SHA1; protocol="application/x-pkcs7-signature"; boundary="----=_NextPart_000_0058_01CE3134.B0076C60" MIME-Version: 1.0 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded (UNCLASSIFIED) X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 17:02:58 -0000 ------=_NextPart_000_0058_01CE3134.B0076C60 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Classification: UNCLASSIFIED Caveats: NONE Yes, real-time applications (i.e. two-way or multipoint conversation) performance requirements are fundamentally much more stringent than those of the near-real-time (i.e. video streaming)/nor-real-time applications. So, settings for testing for each one of those applications must be done accordingly. Best regards, Radhika -----Original Message----- From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of Leon Geyser Sent: Thursday, April 04, 2013 12:56 PM To: Thomas Davies Cc: rtcweb@ietf.org Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded If the purpose is to show whether vp8 is superior as a *technology* to h264 CBP, then I think the comparison should use the best settings you have (ideally with a special full-on non-real time implementation) and test against the JM reference encoder. Ideally you would use the same or similar GOP structures, number of references, prediction and QP hierarchies. I thought WebRTC was meant for real-time communication. What would it benefit us if we test settings that won't be used or can't be used in practice? The tests need to test the encoders at realtime/low latency and at a constrained bitrate mode like CBR. We aren't archiving videos here :) A graph that shows the bitrate over time for each clip could be usefull to make sure that no encoder spikes the bitrate too high at certain moments. I welcome changes to the encoder settings as long as they stay realtime/low latency and constrained bitrate. On 4 April 2013 17:05, Thomas Davies wrote: Harald, Classification: UNCLASSIFIED Caveats: NONE ------=_NextPart_000_0058_01CE3134.B0076C60 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISizCCA3Aw ggJYoAMCAQICAQUwDQYJKoZIhvcNAQEFBQAwWzELMAkGA1UEBhMCVVMxGDAWBgNVBAoTD1UuUy4g R292ZXJubWVudDEMMAoGA1UECxMDRG9EMQwwCgYDVQQLEwNQS0kxFjAUBgNVBAMTDURvRCBSb290 IENBIDIwHhcNMDQxMjEzMTUwMDEwWhcNMjkxMjA1MTUwMDEwWjBbMQswCQYDVQQGEwJVUzEYMBYG A1UEChMPVS5TLiBHb3Zlcm5tZW50MQwwCgYDVQQLEwNEb0QxDDAKBgNVBAsTA1BLSTEWMBQGA1UE AxMNRG9EIFJvb3QgQ0EgMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMAswfaNO6z/ PzzWcb64dCIH7HBBFfyrQOMHqsHD2J/+2kw6vz/I2Ch7SzYBwKxFJcPSDgqPhRhkED0aE3Aqb47X 3I2Ts0EPOCHNravCPSoF01cRNw3NjFH5k+PMRkkhjhS0zcsUPjjNcjHuqxLyZeo0LlZd/+5jdctt upE0/J7z9C0cvlDEQt9ZiP9qs/qobD3LVnFxBZa7n4DlgEVZZ0Gw68OtYKSAdQYXnA70Q+CZDhv7 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id 14.02.0318.004; Thu, 4 Apr 2013 13:23:58 -0500 From: "Thomas Davies (thdavies)" To: "Roy, Radhika R CIV USARMY (US)" , Leon Geyser Thread-Topic: [rtcweb] New VP8 vs H.264 tests uploaded (UNCLASSIFIED) Thread-Index: AQHOMVZDXZgi/Pm44UKs1LSNDRhYqpjGX3ug Date: Thu, 4 Apr 2013 18:23:58 +0000 Message-ID: <9C2FAEDF6B678042ADE3B6686D7C6E150F8A7726@xmb-rcd-x07.cisco.com> References: <515D3FA1.6050305@gmail.com> <515D96A2.1000602@cisco.com> <8486C8728176924BAF5BDB2F7D7EEDDF49A706CD@ucolhp9b.easf.csd.disa.mil> In-Reply-To: <8486C8728176924BAF5BDB2F7D7EEDDF49A706CD@ucolhp9b.easf.csd.disa.mil> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.61.98.73] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded (UNCLASSIFIED) X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 18:23:59 -0000 The single-core encode speed I get from these settings is <5fps for the exa= mple I chose (which is one of the data points), so these are *not* real tim= e tests. My understanding is that Google have selected a non-real-time encoding mode= to show the capabilities of the VP8 technology and attempted to do the sam= e with x264, hence the --tune veryslow parameter.=20 Best regards Thomas -----Original Message----- From: Roy, Radhika R CIV USARMY (US) [mailto:radhika.r.roy.civ@mail.mil]=20 Sent: 04 April 2013 18:03 To: Leon Geyser; Thomas Davies (thdavies) Cc: rtcweb@ietf.org Subject: RE: [rtcweb] New VP8 vs H.264 tests uploaded (UNCLASSIFIED) Classification: UNCLASSIFIED Caveats: NONE Yes, real-time applications (i.e. two-way or multipoint conversation) performance requirements are fundamentally much more stringent than those o= f the near-real-time (i.e. video streaming)/nor-real-time applications. So, settings for testing for each one of those applications must be done accordingly. Best regards, Radhika -----Original Message----- From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of Leon Geyser Sent: Thursday, April 04, 2013 12:56 PM To: Thomas Davies Cc: rtcweb@ietf.org Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded If the purpose is to show whether vp8 is superior as a *technology* to h264 CBP, then I think the comparison should use the best settings you have (ideally with a special full-on non-real time implementation) and test against the JM reference encoder. Ideally you would use the same or similar GOP structures, number of references, prediction and QP hierarchies.=20 =09 I thought WebRTC was meant for real-time communication. What would it benefit us if we test settings that won't be used or can't be used in practice? The tests need to test the encoders at realtime/low latency and at a constrained bitrate mode like CBR. We aren't archiving videos here :) A graph that shows the bitrate over time for each clip could be usefull to make sure that no encoder spikes the bitrate too high at certain moments. I welcome changes to the encoder settings as long as they stay realtime/low latency and constrained bitrate. =20 On 4 April 2013 17:05, Thomas Davies wrote: Harald, Classification: UNCLASSIFIED Caveats: NONE From harald@alvestrand.no Thu Apr 4 11:39:21 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D22A021F8EA6 for ; Thu, 4 Apr 2013 11:39:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.599 X-Spam-Level: X-Spam-Status: No, score=-110.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Om3bfN1YyWFu for ; Thu, 4 Apr 2013 11:39:20 -0700 (PDT) Received: from eikenes.alvestrand.no (eikenes.alvestrand.no [158.38.152.233]) by ietfa.amsl.com (Postfix) with ESMTP id C6EC221F8E7E for ; Thu, 4 Apr 2013 11:39:19 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by eikenes.alvestrand.no (Postfix) with ESMTP id D6D6139E116 for ; Thu, 4 Apr 2013 20:39:18 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at eikenes.alvestrand.no Received: from eikenes.alvestrand.no ([127.0.0.1]) by localhost (eikenes.alvestrand.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0-CldgYug9VK for ; Thu, 4 Apr 2013 20:39:17 +0200 (CEST) Received: from hta-dell.lul.corp.google.com (62-20-124-50.customer.telia.com [62.20.124.50]) by eikenes.alvestrand.no (Postfix) with ESMTPSA id 7F4C239E056 for ; Thu, 4 Apr 2013 20:39:17 +0200 (CEST) Message-ID: <515DC8D5.8030206@alvestrand.no> Date: Thu, 04 Apr 2013 20:39:17 +0200 From: Harald Alvestrand User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130308 Thunderbird/17.0.4 MIME-Version: 1.0 To: rtcweb@ietf.org References: <515D3FA1.6050305@gmail.com> <515D96A2.1000602@cisco.com> <8486C8728176924BAF5BDB2F7D7EEDDF49A706CD@ucolhp9b.easf.csd.disa.mil> <9C2FAEDF6B678042ADE3B6686D7C6E150F8A7726@xmb-rcd-x07.cisco.com> In-Reply-To: <9C2FAEDF6B678042ADE3B6686D7C6E150F8A7726@xmb-rcd-x07.cisco.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded (UNCLASSIFIED) X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 18:39:21 -0000 On 04/04/2013 08:23 PM, Thomas Davies (thdavies) wrote: > The single-core encode speed I get from these settings is <5fps for the example I chose (which is one of the data points), so these are *not* real time tests. > > My understanding is that Google have selected a non-real-time encoding mode to show the capabilities of the VP8 technology and attempted to do the same with x264, hence the --tune veryslow parameter. One of the tests we provide is a comparision of the encode time vs quality for the two codecs. Of course this one varies a LOT even between different developers' machines (the absolute numbers, that is) - machines are very different in how fast they encode. Try it out! > > Best regards > > Thomas > > -----Original Message----- > From: Roy, Radhika R CIV USARMY (US) [mailto:radhika.r.roy.civ@mail.mil] > Sent: 04 April 2013 18:03 > To: Leon Geyser; Thomas Davies (thdavies) > Cc: rtcweb@ietf.org > Subject: RE: [rtcweb] New VP8 vs H.264 tests uploaded (UNCLASSIFIED) > > Classification: UNCLASSIFIED > Caveats: NONE > > Yes, real-time applications (i.e. two-way or multipoint conversation) > performance requirements are fundamentally much more stringent than those of > the near-real-time (i.e. video streaming)/nor-real-time applications. > > So, settings for testing for each one of those applications must be done > accordingly. > > Best regards, > Radhika > > -----Original Message----- > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of > Leon Geyser > Sent: Thursday, April 04, 2013 12:56 PM > To: Thomas Davies > Cc: rtcweb@ietf.org > Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded > > If the purpose is to show whether vp8 is superior as a *technology* > to h264 CBP, then I think the comparison should use the best settings you > have (ideally with a special full-on non-real time implementation) and test > against the JM reference encoder. Ideally you would use the same or similar > GOP structures, number of references, prediction and QP hierarchies. > > > I thought WebRTC was meant for real-time communication. What would it > benefit us if we test settings that won't be used or can't be used in > practice? > > The tests need to test the encoders at realtime/low latency and at a > constrained bitrate mode like CBR. We aren't archiving videos here :) > > A graph that shows the bitrate over time for each clip could be usefull to > make sure that no encoder spikes the bitrate too high at certain moments. > I welcome changes to the encoder settings as long as they stay realtime/low > latency and constrained bitrate. > > On 4 April 2013 17:05, Thomas Davies wrote: > > > Harald, > > > > Classification: UNCLASSIFIED > Caveats: NONE > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From harald@alvestrand.no Thu Apr 4 12:34:14 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1CD8121F8B98 for ; Thu, 4 Apr 2013 12:34:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.598 X-Spam-Level: X-Spam-Status: No, score=-110.598 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ig8SLtJDZbfb for ; Thu, 4 Apr 2013 12:34:12 -0700 (PDT) Received: from eikenes.alvestrand.no (eikenes.alvestrand.no [158.38.152.233]) by ietfa.amsl.com (Postfix) with ESMTP id 0CB4921F8A7E for ; Thu, 4 Apr 2013 12:34:12 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by eikenes.alvestrand.no (Postfix) with ESMTP id F2E3339E116; Thu, 4 Apr 2013 21:34:09 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at eikenes.alvestrand.no Received: from eikenes.alvestrand.no ([127.0.0.1]) by localhost (eikenes.alvestrand.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id S6tWtapgqXCF; Thu, 4 Apr 2013 21:34:07 +0200 (CEST) Received: from hta-dell.lul.corp.google.com (62-20-124-50.customer.telia.com [62.20.124.50]) by eikenes.alvestrand.no (Postfix) with ESMTPSA id 06E1539E056; Thu, 4 Apr 2013 21:34:07 +0200 (CEST) Message-ID: <515DD5AE.8050100@alvestrand.no> Date: Thu, 04 Apr 2013 21:34:06 +0200 From: Harald Alvestrand User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130308 Thunderbird/17.0.4 MIME-Version: 1.0 To: Thomas Davies References: <515D3FA1.6050305@gmail.com> <515D96A2.1000602@cisco.com> In-Reply-To: <515D96A2.1000602@cisco.com> Content-Type: multipart/alternative; boundary="------------000703050505000402060707" Cc: rtcweb@ietf.org Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 19:34:14 -0000 This is a multi-part message in MIME format. --------------000703050505000402060707 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit On 04/04/2013 05:05 PM, Thomas Davies wrote: > Harald, > > I think there are quite a few problems with the comparison you have > posted. > > 1. Looking at the sequences there is a very major difference between > the initial intra frame qualities. When I encode just one frame of > sequence gipsrecomotion using the parameters in the script at 1Mb/s > then the intra frame is 3 times larger with vp8 than with x264. > > With video conferencing content, the quality of the initial I frame > has a big impact that can last for many seconds - certainly the length > of these clips. You can easily get gains by increasing the quality > difference between an I frame and subsequent frames. > > x264 seems to have a policy of initially undershooting the bitrate > substantially and ramping up, whereas vpxenc has a different approach. > During this ramp up period the quality is very much worse. I can't > find a way to persuade x264 to behave differently. > > This is a good illustration of why including rate control in > comparisons is a bad idea. Alternatively, it is a good illustration of why demonstrating codecs without rate control when the applications they are going to be used in require rate control is a thoroughly bogus idea. A large size of the initial iframe doesn't necessarily mean that the bitrate is very high for the first 0.05 seconds, however - one might choose to accept a few extra milliseconds of "setup delay" while the first iframe is transmitted rather than going with a lower quality experience at the start of the call. > > 2. Likewise, looking at the individual frame sizes, it seems vpxenc is > using a quality hierarchy with a length of 8 ("hiercharchical-P") > where every 8th frame is about 4x bigger than the others. x264 has a > constant target per frame. > > Hierarchical P frames are a really good idea, and can easily get you > 10-20% gain with a big separation like this, at a cost in latency. > Again I don't know how to make x264 do this, but the technique is > applicable to any codec and is used in the JM reference. I'm sure you can plug in any encoder you want into the test framework if you want to. I'm not sure we can plug in the JM reference codec, however - I don't remember offhand what license it's under, but suspect that it's "only for use within the MPEG standards process". > > 3. The x264 settings are a bit of a black art, but appear not to be > ideal after all. I am definitely no expert but I found that when > encoding gipsrecomotion at 1Mb/s: > > - setting --threads 1 improves quality by a full 1dB (vpxenc seems to > run single threaded by default) > - reducing the number of references from 3 to 2 (--ref 2) reduces the > load very substantially at very little loss (0.2dB or so). > > So with --threads 1 --ref 2, I found x264 ran more than 2x faster than > vpxenc for this data point and had much better quality than before. > vpxenc is still better (about 1dB), but very possibly within the range > of hierarchical P coding improvements. > > Incidentally, I don't think that x264 performs particularly well at > these high complexity settings, at least for video conferencing, no > doubt as other more practical settings have been targeted. x264 > appears to have a quality ceiling that the JM does not have. Thanks - certainly worth looking at! > > 4. Another (smaller) issue is that the reported PSNR is combined luma > and chroma over all frames. It's relatively easy to improve chroma > PSNR at a small cost in bits, and usually it is best to ignore chroma > PSNR or (possibly) give it a small weight. The arithmetic mean of > frame PSNRs is generally used rather than the PSNR of the whole > sequence, also. I would very much like separate component PSNRs in > tests. The figures I quote above are luma PSNR. "is generally used" is such a nice statement ... the whole psnr.c source code in the test framework is 148 lines long, most of it error checking; I'm happy to see a suggestion for a different psnr measurement method - preferably with accompanying source (and a license that allows us to use it). > > If the purpose is to show whether vp8 is superior as a *technology* to > h264 CBP, then I think the comparison should use the best settings you > have (ideally with a special full-on non-real time implementation) and > test against the JM reference encoder. Ideally you would use the same > or similar GOP structures, number of references, prediction and QP > hierarchies. Why? I've always had a problem with this idea that if one technology does better than another because it's good at using some particular tool, that means that one should handicap it by preventing it from using that particular tool in the way it's good at. Test conditions should (in my opinion) be limited to what's observable, and what matters to the particular conditions we're looking at. In the realtime case, delay, ability to stay within reasonable bandwidth bounds and picture quality are the most obvious things that come to mind; at other times, resilience and adaptability have also been mentioned. But limiting allowable QP hierarchies is, to my mind, not only irrelevant, it's absurd. > > Comparing different real-time implementations of different codecs > trying to do high quality coding with different GOP structures and > using rate control with different strategies is just a waste of time. > The first two elements in the list above are alone worth a very > significant amount of bit rate. > > On the other hand, a quick perusal of the actual tools would suggest > that vp8 and h264 CBP are likely "comparable" and the variation > between implementations of the same technology would be bigger than > the variation between the technologies. If we could agree that then a > lot of time could be saved. Indeed. Of course, the presentation by Cisco in Orlando did not make it easy to see that such an agreement was going to be achieved. Are you suggesting that this is a reasonable conclusion? > > best regards > > Thomas > > > > > On 04/04/13 09:53, Sergio Garcia Murillo wrote: >> Hi Adrian, >> >> Could you explain how the encoding parametrization is comparable? >> >> x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \ >> --vbv-init 0.8 --bitrate ${rate} --fps ${frame_rate} \ >> --profile baseline --no-scenecut --keyint infinite --preset >> veryslow \ >> --input-res ${width}x${height} \ >> --tune psnr \ >> -o ./encoded_clips/h264/${clip_stem}_${rate}kbps.mkv ${filename} \ >> 2> ./logs/h264/${clip_stem}_${rate}kbps.txt >> >> vs: >> >> ./bin/vpxenc --lag-in-frames=0 --target-bitrate=${rate} >> --kf-min-dist=3000 \ >> --kf-max-dist=3000 --cpu-used=0 --fps=${frame_rate}/1 >> --static-thresh=0 \ >> --token-parts=1 --drop-frame=0 --end-usage=cbr --min-q=2 >> --max-q=56 \ >> --undershoot-pct=100 --overshoot-pct=15 --buf-sz=1000 \ >> --buf-initial-sz=800 --buf-optimal-sz=1000 --max-intra-rate=1200 \ >> --resize-allowed=0 --drop-frame=0 --passes=1 --good >> --noise-sensitivity=0 \ >> -w ${width} -h ${height} ${filename} --codec=vp8 \ >> -o ./encoded_clips/vp8/${clip_stem}_${rate}kbps.webm \ >> &>./logs/vp8/${clip_stem}_${rate}kbps.txt >> >> Best regards >> Sergio >> >> El 03/04/2013 18:20, Adrian Grange escribió: >>> We have uploaded a new set of test results comparing VP8 to H.264. >>> This latest set contains fixes for some of the problems in the >>> previous set. We would like to extend our thanks to those who made >>> suggestions as to how we could improve our methodology and encourage >>> suggestions as to how we can make further improvements. >>> >>> In these tests we run x264 with the "veryslow" preset and VP8 with >>> the "good, speed 0" setting in an attempt to produce comparable results. >>> >>> An overview of our results is available as follows: >>> >>> - A Quality comparison (psnr): >>> http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_quality.html >>> >>> - An Encode Speed comparison: >>> http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_speed.html >>> >>> - A comparison of the aggregate time required to decode all of the >>> clips in the test: >>> http://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt >>> >>> All of our test scripts can either be downloaded from: >>> http://downloads.webmproject.org/ietf_tests/vp8_vs_h264.tar.xz >>> or checked out of our git/gerrit repository: >>> git clone http://git.chromium.org/webm/vpx_codec_comparison.git >>> >>> The file README.txt, contained within, presents details of how to >>> build and run the tests. >>> >>> The compressed video files--the output from the quality tests--can >>> also be downloaded: >>> >>> VP8: >>> http://downloads.webmproject.org/ietf_tests/vp8_videos >>> /index.html >>> >>> H.264: >>> http://downloads.webmproject.org/ietf_tests/h264_videos/index.html >>> >>> Adrian Grange >>> >>> >>> >>> >>> >>> >>> >>> _______________________________________________ >>> rtcweb mailing list >>> rtcweb@ietf.org >>> https://www.ietf.org/mailman/listinfo/rtcweb >> >> >> >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb > > --------------000703050505000402060707 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
On 04/04/2013 05:05 PM, Thomas Davies wrote:
Harald,

I think there are quite a few problems with the comparison you have posted.

1. Looking at the sequences there is a very major difference between the initial intra frame qualities. When I encode just one frame of sequence gipsrecomotion using the parameters in the script at 1Mb/s then the intra frame is 3 times larger with vp8 than with x264.

With video conferencing content, the quality of the initial I frame has a big impact that can last for many seconds - certainly the length of these clips. You can easily get gains by increasing the quality difference between an I frame and subsequent frames.

x264 seems to have a policy of initially undershooting the bitrate substantially and ramping up, whereas vpxenc has a different approach. During this ramp up period the quality is very much worse. I can't find a way to persuade x264 to behave differently.

This is a good illustration of why including rate control in comparisons is a bad idea.

Alternatively, it is a good illustration of why demonstrating codecs without rate control when the applications they are going to be used in require rate control is a thoroughly bogus idea.

A large size of the initial iframe doesn't necessarily mean that the bitrate is very high for the first 0.05 seconds, however - one might choose to accept a few extra milliseconds of "setup delay" while the first iframe is transmitted rather than going with a lower quality experience at the start of the call.


2. Likewise, looking at the individual frame sizes, it seems vpxenc is using a quality hierarchy with a length of 8 ("hiercharchical-P") where every 8th frame is about 4x bigger than the others. x264 has a constant target per frame.

Hierarchical P frames are a really good idea, and can easily get you 10-20% gain with a big separation like this, at a cost in latency. Again I don't know how to make x264 do this, but the technique is applicable to any codec and is used in the JM reference.

I'm sure you can plug in any encoder you want into the test framework if you want to. I'm not sure we can plug in the JM reference codec, however - I don't remember offhand what license it's under, but suspect that it's "only for use within the MPEG standards process".


3. The x264 settings are a bit of a black art, but appear not to be ideal after all. I am definitely no expert but I found that when encoding gipsrecomotion at 1Mb/s:

- setting --threads 1 improves quality by a full 1dB (vpxenc seems to run single threaded by default)
- reducing the number of references from 3 to 2 (--ref 2) reduces the load very substantially at very little loss (0.2dB or so).

So with --threads 1 --ref 2, I found x264 ran more than 2x faster than vpxenc for this data point and had much better quality than before. vpxenc is still better (about 1dB), but very possibly within the range of hierarchical P coding improvements.
 
Incidentally, I don't think that x264 performs particularly well at these high complexity settings, at least for video conferencing, no doubt as other more practical settings have been targeted. x264 appears to have a quality ceiling that the JM does not have.

Thanks - certainly worth looking at!


4. Another (smaller) issue is that the reported PSNR is combined luma and chroma over all frames. It's relatively easy to improve chroma PSNR at a small cost in bits, and usually it is best to ignore chroma PSNR or (possibly) give it a small weight. The arithmetic mean of frame PSNRs is generally used rather than the PSNR of the whole sequence, also. I would very much like separate component PSNRs in tests. The figures I quote above are luma PSNR.

"is generally used" is such a nice statement ... the whole psnr.c source code in the test framework is 148 lines long, most of it error checking; I'm happy to see a suggestion for a different psnr measurement method - preferably with accompanying source (and a license that allows us to use it).


If the purpose is to show whether vp8 is superior as a *technology* to h264 CBP, then I think the comparison should use the best settings you have (ideally with a special full-on non-real time implementation) and test against the JM reference encoder. Ideally you would use the same or similar GOP structures, number of references, prediction and QP hierarchies.

Why? I've always had a problem with this idea that if one technology does better than another because it's good at using some particular tool, that means that one should handicap it by preventing it from using that particular tool in the way it's good at.

Test conditions should (in my opinion) be limited to what's observable, and what matters to the particular conditions we're looking at. In the realtime case, delay, ability to stay within reasonable bandwidth bounds and picture quality are the most obvious things that come to mind; at other times, resilience and adaptability have also been mentioned. But limiting allowable QP hierarchies is, to my mind, not only irrelevant, it's absurd.


Comparing different real-time implementations of different codecs trying to do high quality coding with different GOP structures and using rate control with different strategies is just a waste of time. The first two elements in the list above are alone worth a very significant amount of bit rate.

On the other hand, a quick perusal of the actual tools would suggest that vp8 and h264 CBP are likely "comparable" and the variation between implementations of the same technology would be bigger than the variation between the technologies. If we could agree that then a lot of time could be saved.

Indeed. Of course, the presentation by Cisco in Orlando did not make it easy to see that such an agreement was going to be achieved.

Are you suggesting that this is a reasonable conclusion?


best regards

Thomas




On 04/04/13 09:53, Sergio Garcia Murillo wrote:
Hi Adrian,

Could you explain how the encoding parametrization is comparable?

x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \
      --vbv-init 0.8 --bitrate ${rate} --fps ${frame_rate} \
      --profile baseline --no-scenecut --keyint infinite --preset veryslow \
      --input-res ${width}x${height} \
      --tune psnr \
      -o ./encoded_clips/h264/${clip_stem}_${rate}kbps.mkv ${filename} \
      2> ./logs/h264/${clip_stem}_${rate}kbps.txt

vs:

 ./bin/vpxenc --lag-in-frames=0 --target-bitrate=${rate} --kf-min-dist=3000 \
      --kf-max-dist=3000 --cpu-used=0 --fps=${frame_rate}/1 --static-thresh=0 \
      --token-parts=1 --drop-frame=0 --end-usage=cbr --min-q=2 --max-q=56 \
      --undershoot-pct=100 --overshoot-pct=15 --buf-sz=1000 \
      --buf-initial-sz=800 --buf-optimal-sz=1000 --max-intra-rate=1200 \
      --resize-allowed=0 --drop-frame=0 --passes=1 --good --noise-sensitivity=0 \
      -w ${width} -h ${height} ${filename} --codec=vp8 \
      -o ./encoded_clips/vp8/${clip_stem}_${rate}kbps.webm \
      &>./logs/vp8/${clip_stem}_${rate}kbps.txt

Best regards
Sergio

El 03/04/2013 18:20, Adrian Grange escribió:
We have uploaded a new set of test results comparing VP8 to H.264. This latest set contains fixes for some of the problems in the previous set. We would like to extend our thanks to those who made suggestions as to how we could improve our methodology and encourage suggestions as to how we can make further improvements.

In these tests we run x264 with the "veryslow" preset and VP8 with the "good, speed 0" setting in an attempt to produce comparable results.

An overview of our results is available as follows:



- A comparison of the aggregate time required to decode all of the clips in the test: http://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt

All of our test scripts can either be downloaded from:
or checked out of our git/gerrit repository:

The file README.txt, contained within, presents details of how to build and run the tests.

The compressed video files--the output from the quality tests--can also be downloaded:






_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
https://www.ietf.org/mailman/listinfo/rtcweb




_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
https://www.ietf.org/mailman/listinfo/rtcweb



--------------000703050505000402060707-- From mzanaty@cisco.com Thu Apr 4 16:28:37 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3B80F21F875A for ; Thu, 4 Apr 2013 16:28:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0 X-Spam-Level: X-Spam-Status: No, score=x tagged_above=-999 required=5 tests=[] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xcqpON+e56Rl for ; Thu, 4 Apr 2013 16:28:37 -0700 (PDT) Received: from rcdn-iport-5.cisco.com (rcdn-iport-5.cisco.com [173.37.86.76]) by ietfa.amsl.com (Postfix) with ESMTP id C457921F8738 for ; Thu, 4 Apr 2013 16:28:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=464977; q=dns/txt; s=iport; t=1365118114; x=1366327714; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=wGN1mCrRxm2LjsWZy8YizSjx6xgld1C4yvO6B58JaQ4=; b=HHIw3BGT+UY+Bs7LpA8bbDc9V6KsDAnF7OekR45CCgsrOp3P8Is0bKpS 6ncxDx+RwCNoK//wNGOJVz9lxzT5FanFQ5rZlg5HkePOFM7cPe9oovkWR Hplcz5nTNTWdWciSC0Bn13Vz3T3rVT18GMv8EUMKpoz4X7rf8UlOdYzA8 g=; X-Files: x264cbr.png : 315058 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApsEAOULXlGtJV2c/2dsb2JhbADGIw X-IronPort-AV: E=Sophos;i="4.87,412,1363132800"; d="png'150?scan'150,208,217,150";a="195236951" Received: from rcdn-core-5.cisco.com ([173.37.93.156]) by rcdn-iport-5.cisco.com with ESMTP; 04 Apr 2013 23:28:34 +0000 Received: from xhc-rcd-x13.cisco.com (xhc-rcd-x13.cisco.com [173.37.183.87]) by rcdn-core-5.cisco.com (8.14.5/8.14.5) with ESMTP id r34NSXP0002910 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 4 Apr 2013 23:28:33 GMT Received: from xmb-rcd-x14.cisco.com ([169.254.4.51]) by xhc-rcd-x13.cisco.com ([173.37.183.87]) with mapi id 14.02.0318.004; Thu, 4 Apr 2013 18:28:33 -0500 From: "Mo Zanaty (mzanaty)" To: Leon Geyser , "Thomas Davies (thdavies)" , Adrian Grange , "Cullen Jennings (fluffy)" , "Harald Alvestrand (harald@alvestrand.no)" Thread-Topic: [rtcweb] New VP8 vs H.264 tests uploaded Thread-Index: AQHOMVU+Hnjec1L9ZkOY54Vzu17WCpjGSHWg Date: Thu, 4 Apr 2013 23:28:32 +0000 Message-ID: <3879D71E758A7E4AA99A35DD8D41D3D90F69B243@xmb-rcd-x14.cisco.com> References: <515D3FA1.6050305@gmail.com> <515D96A2.1000602@cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.150.30.39] Content-Type: multipart/mixed; boundary="_004_3879D71E758A7E4AA99A35DD8D41D3D90F69B243xmbrcdx14ciscoc_" MIME-Version: 1.0 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 23:28:37 -0000 --_004_3879D71E758A7E4AA99A35DD8D41D3D90F69B243xmbrcdx14ciscoc_ Content-Type: multipart/alternative; boundary="_000_3879D71E758A7E4AA99A35DD8D41D3D90F69B243xmbrcdx14ciscoc_" --_000_3879D71E758A7E4AA99A35DD8D41D3D90F69B243xmbrcdx14ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Realtime/low latency and constrained bitrate are obviously important for th= e actual implementation used. Thomas was pointing out that these factors ha= ve nothing to do with the codec technology itself, since they are purely en= coder implementation optimizations. There is nothing in the VP8 or H.264 st= andard that uniquely provides realtime/low latency or constrained bitrate. = Those are attributes of encoder implementations which are not part of the s= tandard. So the question was whether we care about evaluating codec technology or sp= ecific implementations. If the former, then tests should be staged in the s= ame way codec experts evaluate codec technology/tools. If the latter, then = tests should be staged using the target implementations. I'm not aware of conferencing applications which use x264, because it was d= esigned and optimized for transcoding (dvd rips to blu-ray) not conferencin= g. Most importantly, x264 cbr mode is inappropriate for conferencing since = it is for broadcast MPEG transport streams that must be absolutely CBR to a= void M2TS-mux overflow or underflow, and it will actually insert filler dat= a instead of real frame data to hit the CBR rate exactly. Looking at the re= sults which show the worst H.264 bitrate (62% above VP8) in gipsrecstat_128= 0_720_50_1485kbps.mkv, there is almost as much filler data as real frame da= ta, meaning the true bitrate of real frame data is almost half what is repo= rted in the results. (See attached if it makes it through.) While the results are bad, the methodology, effort and transparency are ver= y good (if we want to compare implementations not standards). I can rerun w= ithout the bogus fillers and post the results next week, unless someone els= e can do it faster. But as Thomas pointed out, the technologies themselves = are comparable as far as coding tools, so any results which show significan= t differences are either suspect or explained by differences in encoder imp= lementations or settings not the codec technology itself. Mo From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of= Leon Geyser Sent: Thursday, April 04, 2013 12:56 PM To: Thomas Davies (thdavies) Cc: rtcweb@ietf.org Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded If the purpose is to show whether vp8 is superior as a *technology* to h264= CBP, then I think the comparison should use the best settings you have (id= eally with a special full-on non-real time implementation) and test against= the JM reference encoder. Ideally you would use the same or similar GOP st= ructures, number of references, prediction and QP hierarchies. I thought WebRTC was meant for real-time communication. What would it benef= it us if we test settings that won't be used or can't be used in practice? The tests need to test the encoders at realtime/low latency and at a constr= ained bitrate mode like CBR. We aren't archiving videos here :) A graph that shows the bitrate over time for each clip could be usefull to = make sure that no encoder spikes the bitrate too high at certain moments. I welcome changes to the encoder settings as long as they stay realtime/low= latency and constrained bitrate. On 4 April 2013 17:05, Thomas Davies > wrote: Harald, I think there are quite a few problems with the comparison you have posted. 1. Looking at the sequences there is a very major difference between the in= itial intra frame qualities. When I encode just one frame of sequence gipsr= ecomotion using the parameters in the script at 1Mb/s then the intra frame = is 3 times larger with vp8 than with x264. With video conferencing content, the quality of the initial I frame has a b= ig impact that can last for many seconds - certainly the length of these cl= ips. You can easily get gains by increasing the quality difference between = an I frame and subsequent frames. x264 seems to have a policy of initially undershooting the bitrate substant= ially and ramping up, whereas vpxenc has a different approach. During this = ramp up period the quality is very much worse. I can't find a way to persua= de x264 to behave differently. This is a good illustration of why including rate control in comparisons is= a bad idea. 2. Likewise, looking at the individual frame sizes, it seems vpxenc is usin= g a quality hierarchy with a length of 8 ("hiercharchical-P") where every 8= th frame is about 4x bigger than the others. x264 has a constant target per= frame. Hierarchical P frames are a really good idea, and can easily get you 10-20%= gain with a big separation like this, at a cost in latency. Again I don't = know how to make x264 do this, but the technique is applicable to any codec= and is used in the JM reference. 3. The x264 settings are a bit of a black art, but appear not to be ideal a= fter all. I am definitely no expert but I found that when encoding gipsreco= motion at 1Mb/s: - setting --threads 1 improves quality by a full 1dB (vpxenc seems to run s= ingle threaded by default) - reducing the number of references from 3 to 2 (--ref 2) reduces the load = very substantially at very little loss (0.2dB or so). So with --threads 1 --ref 2, I found x264 ran more than 2x faster than vpxe= nc for this data point and had much better quality than before. vpxenc is s= till better (about 1dB), but very possibly within the range of hierarchical= P coding improvements. Incidentally, I don't think that x264 performs particularly well at these h= igh complexity settings, at least for video conferencing, no doubt as other= more practical settings have been targeted. x264 appears to have a quality= ceiling that the JM does not have. 4. Another (smaller) issue is that the reported PSNR is combined luma and c= hroma over all frames. It's relatively easy to improve chroma PSNR at a sma= ll cost in bits, and usually it is best to ignore chroma PSNR or (possibly)= give it a small weight. The arithmetic mean of frame PSNRs is generally us= ed rather than the PSNR of the whole sequence, also. I would very much like= separate component PSNRs in tests. The figures I quote above are luma PSNR= . If the purpose is to show whether vp8 is superior as a *technology* to h264= CBP, then I think the comparison should use the best settings you have (id= eally with a special full-on non-real time implementation) and test against= the JM reference encoder. Ideally you would use the same or similar GOP st= ructures, number of references, prediction and QP hierarchies. Comparing different real-time implementations of different codecs trying to= do high quality coding with different GOP structures and using rate contro= l with different strategies is just a waste of time. The first two elements= in the list above are alone worth a very significant amount of bit rate. On the other hand, a quick perusal of the actual tools would suggest that v= p8 and h264 CBP are likely "comparable" and the variation between implement= ations of the same technology would be bigger than the variation between th= e technologies. If we could agree that then a lot of time could be saved. best regards Thomas On 04/04/13 09:53, Sergio Garcia Murillo wrote: Hi Adrian, Could you explain how the encoding parametrization is comparable? x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \ --vbv-init 0.8 --bitrate ${rate} --fps ${frame_rate} \ --profile baseline --no-scenecut --keyint infinite --preset veryslow = \ --input-res ${width}x${height} \ --tune psnr \ -o ./encoded_clips/h264/${clip_stem}_${rate}kbps.mkv ${filename} \ 2> ./logs/h264/${clip_stem}_${rate}kbps.txt vs: ./bin/vpxenc --lag-in-frames=3D0 --target-bitrate=3D${rate} --kf-min-dist= =3D3000 \ --kf-max-dist=3D3000 --cpu-used=3D0 --fps=3D${frame_rate}/1 --static-= thresh=3D0 \ --token-parts=3D1 --drop-frame=3D0 --end-usage=3Dcbr --min-q=3D2 --ma= x-q=3D56 \ --undershoot-pct=3D100 --overshoot-pct=3D15 --buf-sz=3D1000 \ --buf-initial-sz=3D800 --buf-optimal-sz=3D1000 --max-intra-rate=3D120= 0 \ --resize-allowed=3D0 --drop-frame=3D0 --passes=3D1 --good --noise-sen= sitivity=3D0 \ -w ${width} -h ${height} ${filename} --codec=3Dvp8 \ -o ./encoded_clips/vp8/${clip_stem}_${rate}kbps.webm \ &>./logs/vp8/${clip_stem}_${rate}kbps.txt Best regards Sergio El 03/04/2013 18:20, Adrian Grange escribi=F3: We have uploaded a new set of test results comparing VP8 to H.264. This lat= est set contains fixes for some of the problems in the previous set. We wou= ld like to extend our thanks to those who made suggestions as to how we cou= ld improve our methodology and encourage suggestions as to how we can make = further improvements. In these tests we run x264 with the "veryslow" preset and VP8 with the "goo= d, speed 0" setting in an attempt to produce comparable results. An overview of our results is available as follows: - A Quality comparison (psnr): http://downloads.webmproject.org/ietf_tests/= vp8_vs_h264_quality.html - An Encode Speed comparison: http://downloads.webmproject.org/ietf_tests/v= p8_vs_h264_speed.html - A comparison of the aggregate time required to decode all of the clips in= the test: http://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime= .txt All of our test scripts can either be downloaded from: http://downloads.webmproject.org/ietf_tests/vp8_vs_h264.tar.xz or checked out of our git/gerrit repository: git clone http://git.chromium.org/webm/vpx_codec_comparison.git The file README.txt, contained within, presents details of how to build and= run the tests. The compressed video files--the output from the quality tests--can also be = downloaded: VP8: http://downloads.webmproject.org/ietf_tests/vp8_videos/index.html H.264: http://downloads.webmproject.org/ietf_tests/h264_videos/index.html Adrian Grange _______________________________________________ rtcweb mailing list rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb _______________________________________________ rtcweb mailing list rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb _______________________________________________ rtcweb mailing list rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb --_000_3879D71E758A7E4AA99A35DD8D41D3D90F69B243xmbrcdx14ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Realtime/low latency and constrained bi= trate are obviously important for the actual implementation used. Thomas wa= s pointing out that these factors have nothing to do with the codec technology itself, since they are purely encoder implementation = optimizations. There is nothing in the VP8 or H.264 standard that uniquely = provides realtime/low latency or constrained bitrate. Those are attributes = of encoder implementations which are not part of the standard.

 

So the question was whether we care abo= ut evaluating codec technology or specific implementations. If the former, = then tests should be staged in the same way codec experts evaluate codec technology/tools. If the latter, then tests should be stage= d using the target implementations.

 

I’m not aware of conferencing app= lications which use x264, because it was designed and optimized for transco= ding (dvd rips to blu-ray) not conferencing. Most importantly, x264 cbr mode is inappropriate for conferencing since it is for broadcast = MPEG transport streams that must be absolutely CBR to avoid M2TS-mux overfl= ow or underflow, and it will actually insert filler data instead of real fr= ame data to hit the CBR rate exactly. Looking at the results which show the worst H.264 bitrate (62% above VP8) = in gipsrecstat_1280_720_50_1485kbps.mkv, there is almost as much filler dat= a as real frame data, meaning the true bitrate of real frame data is almost= half what is reported in the results. (See attached if it makes it through.)

 

While the results are bad, the methodol= ogy, effort and transparency are very good (if we want to compare implement= ations not standards). I can rerun without the bogus fillers and post the results next week, unless someone else can do it faster. But = as Thomas pointed out, the technologies themselves are comparable as far as= coding tools, so any results which show significant differences are either= suspect or explained by differences in encoder implementations or settings not the codec technology itself.

 

Mo

 

 

From: rtcweb-b= ounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of Leon Geyser
Sent: Thursday, April 04, 2013 12:56 PM
To: Thomas Davies (thdavies)
Cc: rtcweb@ietf.org
Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded

 

If the purpose is to show whether vp8 is superior as= a *technology* to h264 CBP, then I think the comparison should use the bes= t settings you have (ideally with a special full-on non-real time implement= ation) and test against the JM reference encoder. Ideally you would use the same or similar GOP structures, number = of references, prediction and QP hierarchies.

I thought WebRTC was meant for real-time communicati= on. What would it benefit us if we test settings that won't be used or can'= t be used in practice?

The tests need to test the encoders at realtime/low latency and at a constr= ained bitrate mode like CBR. We aren't archiving videos here :)

A graph that shows the bitrate over time for each clip could be usefull to = make sure that no encoder spikes the bitrate too high at certain moments. I welcome changes to the encoder settings as long as they stay realtime/low= latency and constrained bitrate.
 

On 4 April 2013 17:05, Thomas Davies <thdavies@cisco.com> wro= te:

Harald,

I think there are quite a few problems with the comparison you have posted.=

1. Looking at the sequences there is a very major difference between the in= itial intra frame qualities. When I encode just one frame of sequence gipsr= ecomotion using the parameters in the script at 1Mb/s then the intra frame = is 3 times larger with vp8 than with x264.

With video conferencing content, the quality of the initial I frame has a b= ig impact that can last for many seconds - certainly the length of these cl= ips. You can easily get gains by increasing the quality difference between = an I frame and subsequent frames.

x264 seems to have a policy of initially undershooting the bitrate substant= ially and ramping up, whereas vpxenc has a different approach. During this = ramp up period the quality is very much worse. I can't find a way to persua= de x264 to behave differently.

This is a good illustration of why including rate control in comparisons is= a bad idea.

2. Likewise, looking at the individual frame sizes, it seems vpxenc is usin= g a quality hierarchy with a length of 8 ("hiercharchical-P") whe= re every 8th frame is about 4x bigger than the others. x264 has a constant = target per frame.

Hierarchical P frames are a really good idea, and can easily get you 10-20%= gain with a big separation like this, at a cost in latency. Again I don't = know how to make x264 do this, but the technique is applicable to any codec= and is used in the JM reference.

3. The x264 settings are a bit of a black art, but appear not to be ideal a= fter all. I am definitely no expert but I found that when encoding gipsreco= motion at 1Mb/s:

- setting --threads 1 improves quality by a full 1dB (vpxenc seems to run s= ingle threaded by default)
- reducing the number of references from 3 to 2 (--ref 2) reduces the load = very substantially at very little loss (0.2dB or so).

So with --threads 1 --ref 2, I found x264 ran more than 2x faster than vpxe= nc for this data point and had much better quality than before. vpxenc is s= till better (about 1dB), but very possibly within the range of hierarchical= P coding improvements.
 
Incidentally, I don't think that x264 performs particularly well at these h= igh complexity settings, at least for video conferencing, no doubt as other= more practical settings have been targeted. x264 appears to have a quality= ceiling that the JM does not have.

4. Another (smaller) issue is that the reported PSNR is combined luma and c= hroma over all frames. It's relatively easy to improve chroma PSNR at a sma= ll cost in bits, and usually it is best to ignore chroma PSNR or (possibly)= give it a small weight. The arithmetic mean of frame PSNRs is generally used rather than the PSNR of the whole se= quence, also. I would very much like separate component PSNRs in tests. The= figures I quote above are luma PSNR.

If the purpose is to show whether vp8 is superior as a *technology* to h264= CBP, then I think the comparison should use the best settings you have (id= eally with a special full-on non-real time implementation) and test against= the JM reference encoder. Ideally you would use the same or similar GOP structures, number of references, pr= ediction and QP hierarchies.

Comparing different real-time implementations of different codecs trying to= do high quality coding with different GOP structures and using rate contro= l with different strategies is just a waste of time. The first two elements= in the list above are alone worth a very significant amount of bit rate.

On the other hand, a quick perusal of the actual tools would suggest that v= p8 and h264 CBP are likely "comparable" and the variation between= implementations of the same technology would be bigger than the variation = between the technologies. If we could agree that then a lot of time could be saved.

best regards

Thomas





On 04/04/13 09:53, Sergio Garcia Murillo wrote:

Hi Adrian,

Could you explain how the encoding parametrization is comparable?

x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \
      --vbv-init 0.8 --bitrate ${rate} --fps ${fra= me_rate} \
      --profile baseline --no-scenecut --keyint in= finite --preset veryslow \
      --input-res ${width}x${height} \
      --tune psnr \
      -o ./encoded_clips/h264/${clip_stem}_${rate}= kbps.mkv ${filename} \
      2> ./logs/h264/${clip_stem}_${rate}kbps.t= xt

vs:

 ./bin/vpxenc --lag-in-frames=3D0 --target-bitrate=3D${rate} --kf-min-= dist=3D3000 \
      --kf-max-dist=3D3000 --cpu-used=3D0 --fps=3D= ${frame_rate}/1 --static-thresh=3D0 \
      --token-parts=3D1 --drop-frame=3D0 --end-usa= ge=3Dcbr --min-q=3D2 --max-q=3D56 \
      --undershoot-pct=3D100 --overshoot-pct=3D15 = --buf-sz=3D1000 \
      --buf-initial-sz=3D800 --buf-optimal-sz=3D10= 00 --max-intra-rate=3D1200 \
      --resize-allowed=3D0 --drop-frame=3D0 --pass= es=3D1 --good --noise-sensitivity=3D0 \
      -w ${width} -h ${height} ${filename} --codec= =3Dvp8 \
      -o ./encoded_clips/vp8/${clip_stem}_${rate}k= bps.webm \
      &>./logs/vp8/${clip_stem}_${rate}kbps= .txt

Best regards
Sergio

El 03/04/2013 18:20, Adrian Grange escribi=F3:

We have uploaded a new set of test results comparing= VP8 to H.264. This latest set contains fixes for some of the problems in t= he previous set. We would like to extend our thanks to those who made sugge= stions as to how we could improve our methodology and encourage suggestions as to how we can make further im= provements.

 

In these tests we run x264 with the "veryslow&q= uot; preset and VP8 with the "good, speed 0" setting in an attemp= t to produce comparable results.

 

An overview of our results is available as follows:<= o:p>

 

 

 

- A comparison of the aggregate time requ= ired to decode all of the clips in the test: h= ttp://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt

 

All of our test scripts can either b= e downloaded from:

or checked out of our git/gerrit reposito= ry:

 

The file README.txt, contained within, pr= esents details of how to build and run the tests.

 

The compressed video files--the output fr= om the quality tests--can also be downloaded:

 

 

 

 

 

_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
https://www.ietf.org/mailman/listinfo/rtcweb



_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
https://www.ietf.org/mailman/listinfo/rtcweb

 


_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
= https://www.ietf.org/mailman/listinfo/rtcweb

 

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X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.598 X-Spam-Level: X-Spam-Status: No, score=-10.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SmVBI5Xw1RDQ for ; Thu, 4 Apr 2013 16:48:32 -0700 (PDT) Received: from rcdn-iport-7.cisco.com (rcdn-iport-7.cisco.com [173.37.86.78]) by ietfa.amsl.com (Postfix) with ESMTP id 8872421F84D9 for ; Thu, 4 Apr 2013 16:48:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=18784; q=dns/txt; s=iport; t=1365119308; x=1366328908; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=QrC4FC2Dcz9oFrmbhh02SK5GPtAAI13tCXfgPZy2CPo=; b=JelmNRmsADSLvI4oLR1KAQOsx5oOiANGsF0xKiLDoyUWW3iKWHHpiKlw CSubd3aI45ux9xpMuAxOc3kt9cud95Kie96LInnTYxsEHad6mqwCNLR5D 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vs H.264 tests uploaded Thread-Index: AQHOMRH2Yc5K5lTgGEy3dSkUaz32P5jGYuiAgABUC8A= Date: Thu, 4 Apr 2013 23:48:27 +0000 Message-ID: <3879D71E758A7E4AA99A35DD8D41D3D90F69B280@xmb-rcd-x14.cisco.com> References: <515D3FA1.6050305@gmail.com> <515D8087.6080409@alvestrand.no> In-Reply-To: <515D8087.6080409@alvestrand.no> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.150.30.39] Content-Type: multipart/alternative; boundary="_000_3879D71E758A7E4AA99A35DD8D41D3D90F69B280xmbrcdx14ciscoc_" MIME-Version: 1.0 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Apr 2013 23:48:34 -0000 --_000_3879D71E758A7E4AA99A35DD8D41D3D90F69B280xmbrcdx14ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable > Was there any specific parameter or parameter set you were wondering abou= t? --nal-hrd cbr and --bitrate, who suggested those? They were not part of the= suggested settings from x264-devel. Mo From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of= Harald Alvestrand Sent: Thursday, April 04, 2013 9:31 AM To: rtcweb@ietf.org Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded On 04/04/2013 10:53 AM, Sergio Garcia Murillo wrote: Hi Adrian, Could you explain how the encoding parametrization is comparable? x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \ --vbv-init 0.8 --bitrate ${rate} --fps ${frame_rate} \ --profile baseline --no-scenecut --keyint infinite --preset veryslow = \ --input-res ${width}x${height} \ --tune psnr \ -o ./encoded_clips/h264/${clip_stem}_${rate}kbps.mkv ${filename} \ 2> ./logs/h264/${clip_stem}_${rate}kbps.txt vs: ./bin/vpxenc --lag-in-frames=3D0 --target-bitrate=3D${rate} --kf-min-dist= =3D3000 \ --kf-max-dist=3D3000 --cpu-used=3D0 --fps=3D${frame_rate}/1 --static-= thresh=3D0 \ --token-parts=3D1 --drop-frame=3D0 --end-usage=3Dcbr --min-q=3D2 --ma= x-q=3D56 \ --undershoot-pct=3D100 --overshoot-pct=3D15 --buf-sz=3D1000 \ --buf-initial-sz=3D800 --buf-optimal-sz=3D1000 --max-intra-rate=3D120= 0 \ --resize-allowed=3D0 --drop-frame=3D0 --passes=3D1 --good --noise-sen= sitivity=3D0 \ -w ${width} -h ${height} ${filename} --codec=3Dvp8 \ -o ./encoded_clips/vp8/${clip_stem}_${rate}kbps.webm \ &>./logs/vp8/${clip_stem}_${rate}kbps.txt Both have the same target bitrate and the same resolution, and neither gene= rates periodic keyframes. Apart from that, I think they are comparable by virtue of being the paramet= ers that were recommended for this test by people who like this particular = codec implementation. Was there any specific parameter or parameter set you were wondering about? Best regards Sergio El 03/04/2013 18:20, Adrian Grange escribi=F3: We have uploaded a new set of test results comparing VP8 to H.264. This lat= est set contains fixes for some of the problems in the previous set. We wou= ld like to extend our thanks to those who made suggestions as to how we cou= ld improve our methodology and encourage suggestions as to how we can make = further improvements. In these tests we run x264 with the "veryslow" preset and VP8 with the "goo= d, speed 0" setting in an attempt to produce comparable results. An overview of our results is available as follows: - A Quality comparison (psnr): http://downloads.webmproject.org/ietf_tests/= vp8_vs_h264_quality.html - An Encode Speed comparison: http://downloads.webmproject.org/ietf_tests/v= p8_vs_h264_speed.html - A comparison of the aggregate time required to decode all of the clips in= the test: http://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime= .txt All of our test scripts can either be downloaded from: http://downloads.webmproject.org/ietf_tests/vp8_vs_h264.tar.xz or checked out of our git/gerrit repository: git clone http://git.chromium.org/webm/vpx_codec_comparison.git The file README.txt, contained within, presents details of how to build and= run the tests. The compressed video files--the output from the quality tests--can also be = downloaded: VP8: http://downloads.webmproject.org/ietf_tests/vp8_videos/index.html H.264: http://downloads.webmproject.org/ietf_tests/h264_videos/index.html Adrian Grange _______________________________________________ rtcweb mailing list rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb _______________________________________________ rtcweb mailing list rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb --_000_3879D71E758A7E4AA99A35DD8D41D3D90F69B280xmbrcdx14ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

> Was there any specific parameter or parameter s= et you were wondering about?

--nal-hrd cbr and --bi= trate, who suggested those? They were not part of the suggested settings from x264-devel.

 

Mo

 

From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ie= tf.org] On Behalf Of Harald Alvestrand
Sent: Thursday, April 04, 2013 9:31 AM
To: rtcweb@ietf.org
Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded

 

On 04/04/2013 10:53 AM, Sergio Garcia Murillo wrote:=

Hi Adrian,

Could you explain how the encoding parametrization is comparable?

x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \
      --vbv-init 0.8 --bitrate ${rate} --fps ${fra= me_rate} \
      --profile baseline --no-scenecut --keyint in= finite --preset veryslow \
      --input-res ${width}x${height} \
      --tune psnr \
      -o ./encoded_clips/h264/${clip_stem}_${rate}= kbps.mkv ${filename} \
      2> ./logs/h264/${clip_stem}_${rate}kbps.t= xt

vs:

 ./bin/vpxenc --lag-in-frames=3D0 --target-bitrate=3D${rate} --kf-min-= dist=3D3000 \
      --kf-max-dist=3D3000 --cpu-used=3D0 --fps=3D= ${frame_rate}/1 --static-thresh=3D0 \
      --token-parts=3D1 --drop-frame=3D0 --end-usa= ge=3Dcbr --min-q=3D2 --max-q=3D56 \
      --undershoot-pct=3D100 --overshoot-pct=3D15 = --buf-sz=3D1000 \
      --buf-initial-sz=3D800 --buf-optimal-sz=3D10= 00 --max-intra-rate=3D1200 \
      --resize-allowed=3D0 --drop-frame=3D0 --pass= es=3D1 --good --noise-sensitivity=3D0 \
      -w ${width} -h ${height} ${filename} --codec= =3Dvp8 \
      -o ./encoded_clips/vp8/${clip_stem}_${rate}k= bps.webm \
      &>./logs/vp8/${clip_stem}_${rate}kbps= .txt


Both have the same target bitrate and the same resolution, and neither gene= rates periodic keyframes.

Apart from that, I think they are comparable by virtue of being the paramet= ers that were recommended for this test by people who like this particular = codec implementation.

Was there any specific parameter or parameter set you were wondering about?=




Best regards
Sergio

El 03/04/2013 18:20, Adrian Grange escribi=F3:

We have uploaded a new set of test results comparing= VP8 to H.264. This latest set contains fixes for some of the problems in t= he previous set. We would like to extend our thanks to those who made sugge= stions as to how we could improve our methodology and encourage suggestions as to how we can make further im= provements.

 

In these tests we run x264 with the "veryslow&q= uot; preset and VP8 with the "good, speed 0" setting in an attemp= t to produce comparable results.

 

An overview of our results is available as follows:<= o:p>

 

 

 

- A comparison of the aggregate time requ= ired to decode all of the clips in the test: h= ttp://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt

 

All of our test scripts can either b= e downloaded from:

or checked out of our git/gerrit reposito= ry:

 

The file README.txt, contained within, pr= esents details of how to build and run the tests.

 

The compressed video files--the output fr= om the quality tests--can also be downloaded:

 

 

 

 




_______________________________________________
rtcweb mailing list
rtcweb@ietf.org

https://www.i=
etf.org/mailman/listinfo/rtcweb







_______________________________________________
rtcweb mailing list
rtcweb@ietf.org

https://www.i=
etf.org/mailman/listinfo/rtcweb


 
--_000_3879D71E758A7E4AA99A35DD8D41D3D90F69B280xmbrcdx14ciscoc_-- From sergio.garcia.murillo@gmail.com Thu Apr 4 17:13:43 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B89C821F87D3 for ; Thu, 4 Apr 2013 17:13:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.716 X-Spam-Level: X-Spam-Status: No, score=-0.716 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_PBL=0.905, RCVD_IN_SORBS_DUL=0.877, RDNS_DYNAMIC=0.1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9nJw7pZALTxT for ; Thu, 4 Apr 2013 17:13:42 -0700 (PDT) Received: from mail-wi0-x235.google.com (mail-wi0-x235.google.com [IPv6:2a00:1450:400c:c05::235]) by ietfa.amsl.com (Postfix) with ESMTP id ABA4921F86DC for ; Thu, 4 Apr 2013 17:13:41 -0700 (PDT) Received: by mail-wi0-f181.google.com with SMTP id hj8so88512wib.2 for ; Thu, 04 Apr 2013 17:13:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:message-id:date:from:user-agent:mime-version:to:subject :references:in-reply-to:content-type; bh=TvX52Ctvj8kx6K+W8n0SEzvGifQIcKJ6ovlj2o0UkGY=; b=U25sUdziIPdjDWNTsJmfgcJwRG7PIAcvmf+yIj9a+LpWui52V28VDaUym9JjowENnT a1cQ5HegG7N0cweU5zlZboCwacdHNyvz7Rvxa7XBJD1byQeBza6pYtgiYrvdo3/a5Aky 8EYZoIGegQyL3jHl49Cvh2eBawD+XfLGTNhDHxJUR92fPDEQrtOOKMeWnpw9CRj5mN1Y PJDhT7HppP1BdL0niGh1ANXj04AeNDdFiWAgGJEzbe2hne4fRjU9/FAWhGBeQcus0OIt 7UngHMYbrCB6V+ZBb+K3QvHb1heuwCDz31b9iKnM/yQ+y4bgZKrKLTLpt+/186U7WO3Z ggBw== X-Received: by 10.194.57.137 with SMTP id i9mr12438452wjq.18.1365120820188; Thu, 04 Apr 2013 17:13:40 -0700 (PDT) Received: from [192.168.1.2] (215.pool80-103-132.dynamic.orange.es. [80.103.132.215]) by mx.google.com with ESMTPS id s2sm708788wib.4.2013.04.04.17.13.38 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 04 Apr 2013 17:13:39 -0700 (PDT) Message-ID: <515E1734.90702@gmail.com> Date: Fri, 05 Apr 2013 02:13:40 +0200 From: Sergio Garcia Murillo User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <515D3FA1.6050305@gmail.com> <515D96A2.1000602@cisco.com> <3879D71E758A7E4AA99A35DD8D41D3D90F69B243@xmb-rcd-x14.cisco.com> In-Reply-To: <3879D71E758A7E4AA99A35DD8D41D3D90F69B243@xmb-rcd-x14.cisco.com> Content-Type: multipart/alternative; boundary="------------090403080701020205040709" Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Apr 2013 00:13:43 -0000 This is a multi-part message in MIME format. --------------090403080701020205040709 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit El 05/04/2013 1:28, Mo Zanaty (mzanaty) escribió: > > Realtime/low latency and constrained bitrate are obviously important > for the actual implementation used. Thomas was pointing out that these > factors have nothing to do with the codec technology itself, since > they are purely encoder implementation optimizations. There is nothing > in the VP8 or H.264 standard that uniquely provides realtime/low > latency or constrained bitrate. Those are attributes of encoder > implementations which are not part of the standard. > > So the question was whether we care about evaluating codec technology > or specific implementations. If the former, then tests should be > staged in the same way codec experts evaluate codec technology/tools. > If the latter, then tests should be staged using the target > implementations. > > I'm not aware of conferencing applications which use x264, because it > was designed and optimized for transcoding (dvd rips to blu-ray) not > conferencing. Most importantly, x264 cbr mode is inappropriate for > conferencing since it is for broadcast MPEG transport streams that > must be absolutely CBR to avoid M2TS-mux overflow or underflow, and it > will actually insert filler data instead of real frame data to hit the > CBR rate exactly. Looking at the results which show the worst H.264 > bitrate (62% above VP8) in gipsrecstat_1280_720_50_1485kbps.mkv, there > is almost as much filler data as real frame data, meaning the true > bitrate of real frame data is almost half what is reported in the > results. (See attached if it makes it through.) > I have been using x264 with very good results in my mcu implementation, the parameters I use are: params.rc.i_rc_method = X264_RC_ABR; params.rc.i_bitrate = bitrate; params.rc.i_vbv_max_bitrate = bitrate; params.rc.i_vbv_buffer_size = bitrate/fps; params.rc.f_vbv_buffer_init = 0; params.rc.f_rate_tolerance = 0.1; params.b_intra_refresh = 1; I have a smooth and constant bitrate near the target bitrate, which is something I still have not been able to do with VP8 encoder yet (if someone nows the trick, it will be very welcome!). Best regards Sergio --------------090403080701020205040709 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
El 05/04/2013 1:28, Mo Zanaty (mzanaty) escribió:

Realtime/low latency and constrained bitrate are obviously important for the actual implementation used. Thomas was pointing out that these factors have nothing to do with the codec technology itself, since they are purely encoder implementation optimizations. There is nothing in the VP8 or H.264 standard that uniquely provides realtime/low latency or constrained bitrate. Those are attributes of encoder implementations which are not part of the standard.

 

So the question was whether we care about evaluating codec technology or specific implementations. If the former, then tests should be staged in the same way codec experts evaluate codec technology/tools. If the latter, then tests should be staged using the target implementations.

 

I’m not aware of conferencing applications which use x264, because it was designed and optimized for transcoding (dvd rips to blu-ray) not conferencing. Most importantly, x264 cbr mode is inappropriate for conferencing since it is for broadcast MPEG transport streams that must be absolutely CBR to avoid M2TS-mux overflow or underflow, and it will actually insert filler data instead of real frame data to hit the CBR rate exactly. Looking at the results which show the worst H.264 bitrate (62% above VP8) in gipsrecstat_1280_720_50_1485kbps.mkv, there is almost as much filler data as real frame data, meaning the true bitrate of real frame data is almost half what is reported in the results. (See attached if it makes it through.)


I have been using x264 with very good results in my mcu implementation, the parameters I use are:

    params.rc.i_rc_method           = X264_RC_ABR;
    params.rc.i_bitrate                   = bitrate;
    params.rc.i_vbv_max_bitrate = bitrate;
    params.rc.i_vbv_buffer_size   = bitrate/fps;
    params.rc.f_vbv_buffer_init    = 0;
    params.rc.f_rate_tolerance    = 0.1;
    params.b_intra_refresh           = 1;

I have a smooth and constant bitrate near the target bitrate, which is something I still have not been able to do with VP8 encoder yet (if someone nows the trick, it will be very welcome!).

Best regards
Sergio
--------------090403080701020205040709-- From harald@alvestrand.no Fri Apr 5 00:19:12 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 55A8D21F95E1 for ; Fri, 5 Apr 2013 00:19:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.598 X-Spam-Level: X-Spam-Status: No, score=-110.598 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id j2SK2UoE9Lnf for ; Fri, 5 Apr 2013 00:18:57 -0700 (PDT) Received: from eikenes.alvestrand.no (eikenes.alvestrand.no [158.38.152.233]) by ietfa.amsl.com (Postfix) with ESMTP id 4A6EA21F943A for ; Fri, 5 Apr 2013 00:18:56 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by eikenes.alvestrand.no (Postfix) with ESMTP id 534AF39E0C8; Fri, 5 Apr 2013 09:18:54 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at eikenes.alvestrand.no Received: from eikenes.alvestrand.no ([127.0.0.1]) by localhost (eikenes.alvestrand.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mIHfuOfxDUNi; Fri, 5 Apr 2013 09:18:48 +0200 (CEST) Received: from hta-dell.lul.corp.google.com (62-20-124-50.customer.telia.com [62.20.124.50]) by eikenes.alvestrand.no (Postfix) with ESMTPSA id 09D7139E091; Fri, 5 Apr 2013 09:18:48 +0200 (CEST) Message-ID: <515E7AD6.7040001@alvestrand.no> Date: Fri, 05 Apr 2013 09:18:46 +0200 From: Harald Alvestrand User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130308 Thunderbird/17.0.4 MIME-Version: 1.0 To: "Mo Zanaty (mzanaty)" References: <515D3FA1.6050305@gmail.com> <515D96A2.1000602@cisco.com> <3879D71E758A7E4AA99A35DD8D41D3D90F69B243@xmb-rcd-x14.cisco.com> In-Reply-To: <3879D71E758A7E4AA99A35DD8D41D3D90F69B243@xmb-rcd-x14.cisco.com> Content-Type: multipart/alternative; boundary="------------050806080901090103050000" Cc: "Cullen Jennings \(fluffy\)" , "rtcweb@ietf.org" Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Apr 2013 07:19:12 -0000 This is a multi-part message in MIME format. --------------050806080901090103050000 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit On 04/05/2013 01:28 AM, Mo Zanaty (mzanaty) wrote: > > Realtime/low latency and constrained bitrate are obviously important > for the actual implementation used. Thomas was pointing out that these > factors have nothing to do with the codec technology itself, since > they are purely encoder implementation optimizations. There is nothing > in the VP8 or H.264 standard that uniquely provides realtime/low > latency or constrained bitrate. Those are attributes of encoder > implementations which are not part of the standard. > I'd challenge that assumption. If one technology behaves much better under constrained bitrate and/or low latency than the other, that might just possibly be linked to the technology. As an obvious example, consider B-frames; due to their basic "predict from the future" nature, they will incur a latency penalty if used. A test that depends on B-frames will therefore be an invalid test for real-time operation. What we can always be sure of is that when a certain quality is demonstrated under certain conditions, that quality is achievable under those conditions. We should be careful about drawing larger conclusions than that. > So the question was whether we care about evaluating codec technology > or specific implementations. If the former, then tests should be > staged in the same way codec experts evaluate codec technology/tools. > by "the same way codec experts evaluate codec technology/tools", do you mean the way MPEG does it? Having just started working in MPEG, with their procedures for quality evaluations .... I can't say I'm terribly impressed by the evaluation methods used. I'm also very unimpressed with the openness of the process. > If the latter, then tests should be staged using the target > implementations. > > I'm not aware of conferencing applications which use x264, because it > was designed and optimized for transcoding (dvd rips to blu-ray) not > conferencing. Most importantly, x264 cbr mode is inappropriate for > conferencing since it is for broadcast MPEG transport streams that > must be absolutely CBR to avoid M2TS-mux overflow or underflow, and it > will actually insert filler data instead of real frame data to hit the > CBR rate exactly. Looking at the results which show the worst H.264 > bitrate (62% above VP8) in gipsrecstat_1280_720_50_1485kbps.mkv, there > is almost as much filler data as real frame data, meaning the true > bitrate of real frame data is almost half what is reported in the > results. (See attached if it makes it through.) > It made it through, but I can't interpret it much. Certainly sounds like CBR is a setting to avoid. > While the results are bad, the methodology, effort and transparency > are very good (if we want to compare implementations not standards). I > can rerun without the bogus fillers and post the results next week, > unless someone else can do it faster. But as Thomas pointed out, the > technologies themselves are comparable as far as coding tools, so any > results which show significant differences are either suspect or > explained by differences in encoder implementations or settings not > the codec technology itself. > I've pushed (as my first contribution to the actual code; the tests themselves were done by other Googlers) some changes that will make it a little easier for new people who execute them to get predictable results from the tests we published. Looking forward to more contributions! > Mo > > *From:*rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] *On > Behalf Of *Leon Geyser > *Sent:* Thursday, April 04, 2013 12:56 PM > *To:* Thomas Davies (thdavies) > *Cc:* rtcweb@ietf.org > *Subject:* Re: [rtcweb] New VP8 vs H.264 tests uploaded > > If the purpose is to show whether vp8 is superior as a > *technology* to h264 CBP, then I think the comparison should use > the best settings you have (ideally with a special full-on > non-real time implementation) and test against the JM reference > encoder. Ideally you would use the same or similar GOP structures, > number of references, prediction and QP hierarchies. > > I thought WebRTC was meant for real-time communication. What would it > benefit us if we test settings that won't be used or can't be used in > practice? > > The tests need to test the encoders at realtime/low latency and at a > constrained bitrate mode like CBR. We aren't archiving videos here :) > > A graph that shows the bitrate over time for each clip could be > usefull to make sure that no encoder spikes the bitrate too high at > certain moments. > I welcome changes to the encoder settings as long as they stay > realtime/low latency and constrained bitrate. > > On 4 April 2013 17:05, Thomas Davies > wrote: > > Harald, > > I think there are quite a few problems with the comparison you have > posted. > > 1. Looking at the sequences there is a very major difference between > the initial intra frame qualities. When I encode just one frame of > sequence gipsrecomotion using the parameters in the script at 1Mb/s > then the intra frame is 3 times larger with vp8 than with x264. > > With video conferencing content, the quality of the initial I frame > has a big impact that can last for many seconds - certainly the length > of these clips. You can easily get gains by increasing the quality > difference between an I frame and subsequent frames. > > x264 seems to have a policy of initially undershooting the bitrate > substantially and ramping up, whereas vpxenc has a different approach. > During this ramp up period the quality is very much worse. I can't > find a way to persuade x264 to behave differently. > > This is a good illustration of why including rate control in > comparisons is a bad idea. > > 2. Likewise, looking at the individual frame sizes, it seems vpxenc is > using a quality hierarchy with a length of 8 ("hiercharchical-P") > where every 8th frame is about 4x bigger than the others. x264 has a > constant target per frame. > > Hierarchical P frames are a really good idea, and can easily get you > 10-20% gain with a big separation like this, at a cost in latency. > Again I don't know how to make x264 do this, but the technique is > applicable to any codec and is used in the JM reference. > > 3. The x264 settings are a bit of a black art, but appear not to be > ideal after all. I am definitely no expert but I found that when > encoding gipsrecomotion at 1Mb/s: > > - setting --threads 1 improves quality by a full 1dB (vpxenc seems to > run single threaded by default) > - reducing the number of references from 3 to 2 (--ref 2) reduces the > load very substantially at very little loss (0.2dB or so). > > So with --threads 1 --ref 2, I found x264 ran more than 2x faster than > vpxenc for this data point and had much better quality than before. > vpxenc is still better (about 1dB), but very possibly within the range > of hierarchical P coding improvements. > > Incidentally, I don't think that x264 performs particularly well at > these high complexity settings, at least for video conferencing, no > doubt as other more practical settings have been targeted. x264 > appears to have a quality ceiling that the JM does not have. > > 4. Another (smaller) issue is that the reported PSNR is combined luma > and chroma over all frames. It's relatively easy to improve chroma > PSNR at a small cost in bits, and usually it is best to ignore chroma > PSNR or (possibly) give it a small weight. The arithmetic mean of > frame PSNRs is generally used rather than the PSNR of the whole > sequence, also. I would very much like separate component PSNRs in > tests. The figures I quote above are luma PSNR. > > If the purpose is to show whether vp8 is superior as a *technology* to > h264 CBP, then I think the comparison should use the best settings you > have (ideally with a special full-on non-real time implementation) and > test against the JM reference encoder. Ideally you would use the same > or similar GOP structures, number of references, prediction and QP > hierarchies. > > Comparing different real-time implementations of different codecs > trying to do high quality coding with different GOP structures and > using rate control with different strategies is just a waste of time. > The first two elements in the list above are alone worth a very > significant amount of bit rate. > > On the other hand, a quick perusal of the actual tools would suggest > that vp8 and h264 CBP are likely "comparable" and the variation > between implementations of the same technology would be bigger than > the variation between the technologies. If we could agree that then a > lot of time could be saved. > > best regards > > Thomas > > > > > > On 04/04/13 09:53, Sergio Garcia Murillo wrote: > > Hi Adrian, > > Could you explain how the encoding parametrization is comparable? > > x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \ > --vbv-init 0.8 --bitrate ${rate} --fps ${frame_rate} \ > --profile baseline --no-scenecut --keyint infinite --preset > veryslow \ > --input-res ${width}x${height} \ > --tune psnr \ > -o ./encoded_clips/h264/${clip_stem}_${rate}kbps.mkv ${filename} \ > 2> ./logs/h264/${clip_stem}_${rate}kbps.txt > > vs: > > ./bin/vpxenc --lag-in-frames=0 --target-bitrate=${rate} > --kf-min-dist=3000 \ > --kf-max-dist=3000 --cpu-used=0 --fps=${frame_rate}/1 > --static-thresh=0 \ > --token-parts=1 --drop-frame=0 --end-usage=cbr --min-q=2 > --max-q=56 \ > --undershoot-pct=100 --overshoot-pct=15 --buf-sz=1000 \ > --buf-initial-sz=800 --buf-optimal-sz=1000 --max-intra-rate=1200 \ > --resize-allowed=0 --drop-frame=0 --passes=1 --good > --noise-sensitivity=0 \ > -w ${width} -h ${height} ${filename} --codec=vp8 \ > -o ./encoded_clips/vp8/${clip_stem}_${rate}kbps.webm \ > &>./logs/vp8/${clip_stem}_${rate}kbps.txt > > Best regards > Sergio > > El 03/04/2013 18:20, Adrian Grange escribió: > > We have uploaded a new set of test results comparing VP8 to H.264. > This latest set contains fixes for some of the problems in the > previous set. We would like to extend our thanks to those who made > suggestions as to how we could improve our methodology and > encourage suggestions as to how we can make further improvements. > > In these tests we run x264 with the "veryslow" preset and VP8 with > the "good, speed 0" setting in an attempt to produce comparable > results. > > An overview of our results is available as follows: > > - A Quality comparison (psnr): > http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_quality.html > > - An Encode Speed comparison: > http://downloads.webmproject.org/ietf_tests/vp8_vs_h264_speed.html > > - A comparison of the aggregate time required to decode all of the > clips in the test: > http://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt > > All of our test scripts can either be downloaded from: > > http://downloads.webmproject.org/ietf_tests/vp8_vs_h264.tar.xz > > or checked out of our git/gerrit repository: > > git clone http://git.chromium.org/webm/vpx_codec_comparison.git > > The file README.txt, contained within, presents details of how to > build and run the tests. > > The compressed video files--the output from the quality tests--can > also be downloaded: > > VP8: > > http://downloads.webmproject.org/ietf_tests/vp8_videos > /index.html > > H.264: > > http://downloads.webmproject.org/ietf_tests/h264_videos/index.html > > Adrian Grange > > _______________________________________________ > > rtcweb mailing list > > rtcweb@ietf.org > > https://www.ietf.org/mailman/listinfo/rtcweb > > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > --------------050806080901090103050000 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
On 04/05/2013 01:28 AM, Mo Zanaty (mzanaty) wrote:

Realtime/low latency and constrained bitrate are obviously important for the actual implementation used. Thomas was pointing out that these factors have nothing to do with the codec technology itself, since they are purely encoder implementation optimizations. There is nothing in the VP8 or H.264 standard that uniquely provides realtime/low latency or constrained bitrate. Those are attributes of encoder implementations which are not part of the standard.


I'd challenge that assumption.
If one technology behaves much better under constrained bitrate and/or low latency than the other, that might just possibly be linked to the technology.

As an obvious example, consider B-frames; due to their basic "predict from the future" nature, they will incur a latency penalty if used.
A test that depends on B-frames will therefore be an invalid test for real-time operation.

What we can always be sure of is that when a certain quality is demonstrated under certain conditions, that quality is achievable under those conditions. We should be careful about drawing larger conclusions than that.

 

So the question was whether we care about evaluating codec technology or specific implementations. If the former, then tests should be staged in the same way codec experts evaluate codec technology/tools.


by "the same way codec experts evaluate codec technology/tools", do you mean the way MPEG does it?

Having just started working in MPEG, with their procedures for quality evaluations .... I can't say I'm terribly impressed by the evaluation methods used. I'm also very unimpressed with the openness of the process.

If the latter, then tests should be staged using the target implementations.

 

I’m not aware of conferencing applications which use x264, because it was designed and optimized for transcoding (dvd rips to blu-ray) not conferencing. Most importantly, x264 cbr mode is inappropriate for conferencing since it is for broadcast MPEG transport streams that must be absolutely CBR to avoid M2TS-mux overflow or underflow, and it will actually insert filler data instead of real frame data to hit the CBR rate exactly. Looking at the results which show the worst H.264 bitrate (62% above VP8) in gipsrecstat_1280_720_50_1485kbps.mkv, there is almost as much filler data as real frame data, meaning the true bitrate of real frame data is almost half what is reported in the results. (See attached if it makes it through.)

It made it through, but I can't interpret it much. Certainly sounds like CBR is a setting to avoid.

 

While the results are bad, the methodology, effort and transparency are very good (if we want to compare implementations not standards). I can rerun without the bogus fillers and post the results next week, unless someone else can do it faster. But as Thomas pointed out, the technologies themselves are comparable as far as coding tools, so any results which show significant differences are either suspect or explained by differences in encoder implementations or settings not the codec technology itself.


I've pushed (as my first contribution to the actual code; the tests themselves were done by other Googlers) some changes that will make it a little easier for new people who execute them to get predictable results from the tests we published.

Looking forward to more contributions!


 

Mo

 

 

From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of Leon Geyser
Sent: Thursday, April 04, 2013 12:56 PM
To: Thomas Davies (thdavies)
Cc: rtcweb@ietf.org
Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded

 

If the purpose is to show whether vp8 is superior as a *technology* to h264 CBP, then I think the comparison should use the best settings you have (ideally with a special full-on non-real time implementation) and test against the JM reference encoder. Ideally you would use the same or similar GOP structures, number of references, prediction and QP hierarchies.

I thought WebRTC was meant for real-time communication. What would it benefit us if we test settings that won't be used or can't be used in practice?

The tests need to test the encoders at realtime/low latency and at a constrained bitrate mode like CBR. We aren't archiving videos here :)

A graph that shows the bitrate over time for each clip could be usefull to make sure that no encoder spikes the bitrate too high at certain moments.
I welcome changes to the encoder settings as long as they stay realtime/low latency and constrained bitrate.
 

On 4 April 2013 17:05, Thomas Davies <thdavies@cisco.com> wrote:

Harald,

I think there are quite a few problems with the comparison you have posted.

1. Looking at the sequences there is a very major difference between the initial intra frame qualities. When I encode just one frame of sequence gipsrecomotion using the parameters in the script at 1Mb/s then the intra frame is 3 times larger with vp8 than with x264.

With video conferencing content, the quality of the initial I frame has a big impact that can last for many seconds - certainly the length of these clips. You can easily get gains by increasing the quality difference between an I frame and subsequent frames.

x264 seems to have a policy of initially undershooting the bitrate substantially and ramping up, whereas vpxenc has a different approach. During this ramp up period the quality is very much worse. I can't find a way to persuade x264 to behave differently.

This is a good illustration of why including rate control in comparisons is a bad idea.

2. Likewise, looking at the individual frame sizes, it seems vpxenc is using a quality hierarchy with a length of 8 ("hiercharchical-P") where every 8th frame is about 4x bigger than the others. x264 has a constant target per frame.

Hierarchical P frames are a really good idea, and can easily get you 10-20% gain with a big separation like this, at a cost in latency. Again I don't know how to make x264 do this, but the technique is applicable to any codec and is used in the JM reference.

3. The x264 settings are a bit of a black art, but appear not to be ideal after all. I am definitely no expert but I found that when encoding gipsrecomotion at 1Mb/s:

- setting --threads 1 improves quality by a full 1dB (vpxenc seems to run single threaded by default)
- reducing the number of references from 3 to 2 (--ref 2) reduces the load very substantially at very little loss (0.2dB or so).

So with --threads 1 --ref 2, I found x264 ran more than 2x faster than vpxenc for this data point and had much better quality than before. vpxenc is still better (about 1dB), but very possibly within the range of hierarchical P coding improvements.
 
Incidentally, I don't think that x264 performs particularly well at these high complexity settings, at least for video conferencing, no doubt as other more practical settings have been targeted. x264 appears to have a quality ceiling that the JM does not have.

4. Another (smaller) issue is that the reported PSNR is combined luma and chroma over all frames. It's relatively easy to improve chroma PSNR at a small cost in bits, and usually it is best to ignore chroma PSNR or (possibly) give it a small weight. The arithmetic mean of frame PSNRs is generally used rather than the PSNR of the whole sequence, also. I would very much like separate component PSNRs in tests. The figures I quote above are luma PSNR.

If the purpose is to show whether vp8 is superior as a *technology* to h264 CBP, then I think the comparison should use the best settings you have (ideally with a special full-on non-real time implementation) and test against the JM reference encoder. Ideally you would use the same or similar GOP structures, number of references, prediction and QP hierarchies.

Comparing different real-time implementations of different codecs trying to do high quality coding with different GOP structures and using rate control with different strategies is just a waste of time. The first two elements in the list above are alone worth a very significant amount of bit rate.

On the other hand, a quick perusal of the actual tools would suggest that vp8 and h264 CBP are likely "comparable" and the variation between implementations of the same technology would be bigger than the variation between the technologies. If we could agree that then a lot of time could be saved.

best regards

Thomas





On 04/04/13 09:53, Sergio Garcia Murillo wrote:

Hi Adrian,

Could you explain how the encoding parametrization is comparable?

x264 --nal-hrd cbr --vbv-maxrate ${rate} --vbv-bufsize ${rate} \
      --vbv-init 0.8 --bitrate ${rate} --fps ${frame_rate} \
      --profile baseline --no-scenecut --keyint infinite --preset veryslow \
      --input-res ${width}x${height} \
      --tune psnr \
      -o ./encoded_clips/h264/${clip_stem}_${rate}kbps.mkv ${filename} \
      2> ./logs/h264/${clip_stem}_${rate}kbps.txt

vs:

 ./bin/vpxenc --lag-in-frames=0 --target-bitrate=${rate} --kf-min-dist=3000 \
      --kf-max-dist=3000 --cpu-used=0 --fps=${frame_rate}/1 --static-thresh=0 \
      --token-parts=1 --drop-frame=0 --end-usage=cbr --min-q=2 --max-q=56 \
      --undershoot-pct=100 --overshoot-pct=15 --buf-sz=1000 \
      --buf-initial-sz=800 --buf-optimal-sz=1000 --max-intra-rate=1200 \
      --resize-allowed=0 --drop-frame=0 --passes=1 --good --noise-sensitivity=0 \
      -w ${width} -h ${height} ${filename} --codec=vp8 \
      -o ./encoded_clips/vp8/${clip_stem}_${rate}kbps.webm \
      &>./logs/vp8/${clip_stem}_${rate}kbps.txt

Best regards
Sergio

El 03/04/2013 18:20, Adrian Grange escribió:

We have uploaded a new set of test results comparing VP8 to H.264. This latest set contains fixes for some of the problems in the previous set. We would like to extend our thanks to those who made suggestions as to how we could improve our methodology and encourage suggestions as to how we can make further improvements.

 

In these tests we run x264 with the "veryslow" preset and VP8 with the "good, speed 0" setting in an attempt to produce comparable results.

 

An overview of our results is available as follows:

 

 

 

- A comparison of the aggregate time required to decode all of the clips in the test: http://downloads.webmproject.org/ietf_tests/vp8vsh264-decodetime.txt

 

All of our test scripts can either be downloaded from:

or checked out of our git/gerrit repository:

 

The file README.txt, contained within, presents details of how to build and run the tests.

 

The compressed video files--the output from the quality tests--can also be downloaded:

 

 

 

 

 

_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
https://www.ietf.org/mailman/listinfo/rtcweb



_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
https://www.ietf.org/mailman/listinfo/rtcweb

 


_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
https://www.ietf.org/mailman/listinfo/rtcweb

 


--------------050806080901090103050000-- From radhika.r.roy.civ@mail.mil Fri Apr 5 07:20:32 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D46F021F97DE for ; Fri, 5 Apr 2013 07:20:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xrBUg01nNYBM for ; Fri, 5 Apr 2013 07:20:31 -0700 (PDT) Received: from edge-cols.mail.mil (edge-cols.mail.mil [131.64.100.6]) by ietfa.amsl.com (Postfix) with ESMTP id 4E81D21F97C9 for ; Fri, 5 Apr 2013 07:20:29 -0700 (PDT) Received: from UCOLHP2Z.easf.csd.disa.mil (131.64.100.147) by UCOLHP4Z.easf.csd.disa.mil (131.64.100.6) with Microsoft SMTP Server (TLS) id 14.2.309.2; Fri, 5 Apr 2013 14:20:12 +0000 Received: from UCOLHP9B.easf.csd.disa.mil ([169.254.10.116]) by UCOLHP2Z.easf.csd.disa.mil ([131.64.100.147]) with mapi id 14.03.0123.003; Fri, 5 Apr 2013 14:20:11 +0000 From: "Roy, Radhika R CIV USARMY (US)" To: "Mo Zanaty (mzanaty)" , Leon Geyser , "Thomas Davies (thdavies)" , "Adrian Grange" , "Cullen Jennings (fluffy)" , "Harald Alvestrand (harald@alvestrand.no)" Thread-Topic: [rtcweb] New VP8 vs H.264 tests uploaded (UNCLASSIFIED) Thread-Index: AQHOMVU+Hnjec1L9ZkOY54Vzu17WCpjGSHWggAFiQKA= Date: Fri, 5 Apr 2013 14:20:09 +0000 Message-ID: <8486C8728176924BAF5BDB2F7D7EEDDF49A709AA@ucolhp9b.easf.csd.disa.mil> References: <515D3FA1.6050305@gmail.com> <515D96A2.1000602@cisco.com> <3879D71E758A7E4AA99A35DD8D41D3D90F69B243@xmb-rcd-x14.cisco.com> In-Reply-To: <3879D71E758A7E4AA99A35DD8D41D3D90F69B243@xmb-rcd-x14.cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [131.64.62.4] Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=SHA1; boundary="----=_NextPart_000_001C_01CE31E7.24C9E2A0" MIME-Version: 1.0 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded (UNCLASSIFIED) X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Apr 2013 14:20:32 -0000 ------=_NextPart_000_001C_01CE31E7.24C9E2A0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Classification: UNCLASSIFIED Caveats: NONE Inline [RRR] -----Original Message----- From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of Mo Zanaty (mzanaty) Sent: Thursday, April 04, 2013 7:29 PM To: Leon Geyser; Thomas Davies (thdavies); Adrian Grange; Cullen Jennings (fluffy); Harald Alvestrand (harald@alvestrand.no) Cc: rtcweb@ietf.org Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded Realtime/low latency and constrained bitrate are obviously important for the actual implementation used. Thomas was pointing out that these factors have nothing to do with the codec technology itself, since they are purely encoder implementation optimizations. There is nothing in the VP8 or H.264 standard that uniquely provides realtime/low latency or constrained bitrate. Those are attributes of encoder implementations which are not part of the standard. [RRR] Yes, it is dependent on the codec technology how the encoding and decoding technology conceals the BER and hence affect the video quality. The MOS subjective or objective coding performances video quality is also dependent on the end-to-end latency for two-way or multipoint conversation vs. one-way video streaming. [RRR] The key is to capture all the parameters of video coding experimental test environments under certain circumstances starting from back-to-back codec to across the wide area network including wireline and wrieless. Let us speak on these specific test environments including applications and the corresponding video quality (subjective and/or objective). [RRR] Before generalization of the video performances from the specific test results, let us understand what test results we have got for that specific test environments. 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2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5602021F9800 for ; Fri, 5 Apr 2013 08:01:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.977 X-Spam-Level: X-Spam-Status: No, score=-1.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vdJNRnZhCMGe for ; Fri, 5 Apr 2013 08:01:47 -0700 (PDT) Received: from mail-ob0-x242.google.com (mail-ob0-x242.google.com [IPv6:2607:f8b0:4003:c01::242]) by ietfa.amsl.com (Postfix) with ESMTP id BB95821F97F2 for ; Fri, 5 Apr 2013 08:01:46 -0700 (PDT) Received: by mail-ob0-f194.google.com with SMTP id ef5so850792obb.5 for ; Fri, 05 Apr 2013 08:01:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20120113; h=mime-version:x-received:date:message-id:subject:from:to :content-type; bh=NivrJAw4dtz/gAJkvgnm1hIfps8+avpVoNTYt1Jl1Os=; b=GU+l9eext205w3GsiArrC43v7IVz47hj14bKLKCzNdnWhBl86E9m+UjlkS6FbNDoWQ baVBLiuf+wvbtxjv3aDtnTsJgZ4ojd99t1QkSxW4B4a5eaerk7BcWsajQSeSF0k0QQ+o w2GBJZ4CL5T2B9Seo5OuCPntK+GKkv982REo3DgMbIm2dILJpO2GqGa6a4nhc6uPyiyM 95zm8M0g152LlEHDjvV3m3B+7BAkQ26VJAFRBnS4smjhVlDGJoD/utUJpnz8xdEtLMWR HtbvOG80U+4oHFrymTQoeQen63yuNGpV9Fd3igRRac3n3zWozvutqZMtAhGDJO94aD4W SmIg== MIME-Version: 1.0 X-Received: by 10.182.153.164 with SMTP id vh4mr8312992obb.10.1365174106337; Fri, 05 Apr 2013 08:01:46 -0700 (PDT) Received: by 10.76.169.167 with HTTP; Fri, 5 Apr 2013 08:01:46 -0700 (PDT) Date: Fri, 5 Apr 2013 16:01:46 +0100 Message-ID: From: Kieran Kunhya To: rtcweb@ietf.org Content-Type: multipart/alternative; boundary=089e0149c37caa3aeb04d99e5d29 Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Apr 2013 15:01:47 -0000 --089e0149c37caa3aeb04d99e5d29 Content-Type: text/plain; charset=ISO-8859-1 Any of the x264 developers would have been happy to help you choose appropriate settings. I made this suggestion to Harald since major codec comparisons (e.g MSU, EBU) have communicated extensively with all codec vendors involved. This did not happen and again inappropriate settings have been used like filler bytes, 1 second VBV, large encoder latency (default settings) etc. Also it is complete nonsense to say x264 is not designed for low latency cf - http://x264dev.multimedia.cx/archives/249 I have deployed x264 for low-latency broadcast contribution beating professional encoders in latency and quality and others use it extensively for videoconferencing/cloud-gaming etc. I would politely ask again if the people running codec comparisons ask on the x264-devel mailing list or on #x264dev on Freenode IRC. --089e0149c37caa3aeb04d99e5d29 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Any of the x264 developers would have been = happy to help you choose appropriate settings. I made this suggestion to Ha= rald since major codec comparisons (e.g MSU, EBU) have communicated extensi= vely with all codec vendors involved. This did not happen and again inappro= priate settings have been used like filler bytes, 1 second VBV, large encod= er latency (default settings) etc.

Also it is complete nonsense to say x264 is not= designed for low latency cf -=A0http://x264dev.m= ultimedia.cx/archives/249
I have deployed x264 for low-latency broadcast contribution = beating professional encoders in latency and quality and others use it exte= nsively for videoconferencing/cloud-gaming etc.

I would politely ask again if the people runnin= g codec comparisons ask on the x264-devel mailing list or on #x264dev on Fr= eenode IRC.
--089e0149c37caa3aeb04d99e5d29-- From mzanaty@cisco.com Fri Apr 5 09:24:33 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6B22F21F97F4 for ; Fri, 5 Apr 2013 09:24:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.598 X-Spam-Level: X-Spam-Status: No, score=-10.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ppzrSLDX6-nD for ; Fri, 5 Apr 2013 09:24:31 -0700 (PDT) Received: from rcdn-iport-8.cisco.com (rcdn-iport-8.cisco.com [173.37.86.79]) by ietfa.amsl.com (Postfix) with ESMTP id 4162521F9643 for ; Fri, 5 Apr 2013 09:24:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=10751; q=dns/txt; s=iport; t=1365179071; x=1366388671; h=from:to:subject:date:message-id:references:in-reply-to: mime-version; bh=AiYHuwhp5/sJcC7xChMizKUVsV0g+IKmD8VZPePSHMw=; b=aFTb1eOYp72g9mwlYQOlat4BlE4pWYllK9gR+mOWHQdFgVIhYIFI/q53 ZKlvJukDAduXEvxVBEju78MrZvtL1pp9srzW3C4LZX4F++mHc+BmZSWag Fb7dQ6h/52vqoSvbVcC8uscAukNpuJsu0PbMWYIyxQXDZveCnriKUmMLe U=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgMFABz6XlGtJXHA/2dsb2JhbABLgkJENsEegQwWdIIfAQEBBC0+CRUCAQgVDR0HMhQRAgQBEgiIDMFxiQeFYyYRAYJfYQOIRJ83gwuCKA X-IronPort-AV: E=Sophos;i="4.87,415,1363132800"; d="scan'208,217";a="195490355" Received: from rcdn-core2-5.cisco.com ([173.37.113.192]) by rcdn-iport-8.cisco.com with ESMTP; 05 Apr 2013 16:24:30 +0000 Received: from xhc-aln-x03.cisco.com (xhc-aln-x03.cisco.com [173.36.12.77]) by rcdn-core2-5.cisco.com (8.14.5/8.14.5) with ESMTP id r35GOUut015510 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Fri, 5 Apr 2013 16:24:30 GMT Received: from xmb-rcd-x14.cisco.com ([169.254.4.51]) by xhc-aln-x03.cisco.com ([173.36.12.77]) with mapi id 14.02.0318.004; Fri, 5 Apr 2013 11:24:30 -0500 From: "Mo Zanaty (mzanaty)" To: Sergio Garcia Murillo , "rtcweb@ietf.org" Thread-Topic: [rtcweb] New VP8 vs H.264 tests uploaded Thread-Index: AQHOMVU+Hnjec1L9ZkOY54Vzu17WCpjGSHWggADNiwCAAJYR0A== Date: Fri, 5 Apr 2013 16:24:29 +0000 Message-ID: <3879D71E758A7E4AA99A35DD8D41D3D90F69B5D3@xmb-rcd-x14.cisco.com> References: <515D3FA1.6050305@gmail.com> <515D96A2.1000602@cisco.com> <3879D71E758A7E4AA99A35DD8D41D3D90F69B243@xmb-rcd-x14.cisco.com> <515E1734.90702@gmail.com> In-Reply-To: <515E1734.90702@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.150.30.39] Content-Type: multipart/alternative; boundary="_000_3879D71E758A7E4AA99A35DD8D41D3D90F69B5D3xmbrcdx14ciscoc_" MIME-Version: 1.0 Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Apr 2013 16:24:33 -0000 --_000_3879D71E758A7E4AA99A35DD8D41D3D90F69B5D3xmbrcdx14ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Check your output x264 streams for fillers. If you see fillers (NAL unit ty= pe 12), you are wasting bandwidth. In the example below, almost half the bi= trate was wasted on fillers and other stuff (SEI) that are not real frames.= Over RTP, you would waste even more than half the link bandwidth since the= small SEIs would incur the full overhead of separate RTP packets. (40 byte= s of RTP/UDP/IP overhead for 10 bytes of SEI.) Mo From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of= Sergio Garcia Murillo El 05/04/2013 1:28, Mo Zanaty (mzanaty) escribi=F3: Realtime/low latency and constrained bitrate are obviously important for th= e actual implementation used. Thomas was pointing out that these factors ha= ve nothing to do with the codec technology itself, since they are purely en= coder implementation optimizations. There is nothing in the VP8 or H.264 st= andard that uniquely provides realtime/low latency or constrained bitrate. = Those are attributes of encoder implementations which are not part of the s= tandard. So the question was whether we care about evaluating codec technology or sp= ecific implementations. If the former, then tests should be staged in the s= ame way codec experts evaluate codec technology/tools. If the latter, then = tests should be staged using the target implementations. I'm not aware of conferencing applications which use x264, because it was d= esigned and optimized for transcoding (dvd rips to blu-ray) not conferencin= g. Most importantly, x264 cbr mode is inappropriate for conferencing since = it is for broadcast MPEG transport streams that must be absolutely CBR to a= void M2TS-mux overflow or underflow, and it will actually insert filler dat= a instead of real frame data to hit the CBR rate exactly. Looking at the re= sults which show the worst H.264 bitrate (62% above VP8) in gipsrecstat_128= 0_720_50_1485kbps.mkv, there is almost as much filler data as real frame da= ta, meaning the true bitrate of real frame data is almost half what is repo= rted in the results. (See attached if it makes it through.) I have been using x264 with very good results in my mcu implementation, the= parameters I use are: params.rc.i_rc_method =3D X264_RC_ABR; params.rc.i_bitrate =3D bitrate; params.rc.i_vbv_max_bitrate =3D bitrate; params.rc.i_vbv_buffer_size =3D bitrate/fps; params.rc.f_vbv_buffer_init =3D 0; params.rc.f_rate_tolerance =3D 0.1; params.b_intra_refresh =3D 1; I have a smooth and constant bitrate near the target bitrate, which is some= thing I still have not been able to do with VP8 encoder yet (if someone now= s the trick, it will be very welcome!). Best regards Sergio --_000_3879D71E758A7E4AA99A35DD8D41D3D90F69B5D3xmbrcdx14ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Check your output x264= streams for fillers. If you see fillers (NAL unit type 12), you are wastin= g bandwidth. In the example below, almost half the bitrate was wasted on fillers and other stuff (SEI) that are not real frames. Over= RTP, you would waste even more than half the link bandwidth since the smal= l SEIs would incur the full overhead of separate RTP packets. (40 bytes of = RTP/UDP/IP overhead for 10 bytes of SEI.)

 

Mo

 

 

From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ie= tf.org] On Behalf Of Sergio Garcia Murillo

 

El 05/04/2013 1:28, Mo Zanaty (mzanaty) escribi=F3:<= o:p>

Realtime/low latency and constrained bi= trate are obviously important for the actual implementation used. Thomas wa= s pointing out that these factors have nothing to do with the codec technology itself, since they are purely encoder implementation = optimizations. There is nothing in the VP8 or H.264 standard that uniquely = provides realtime/low latency or constrained bitrate. Those are attributes = of encoder implementations which are not part of the standard.

 

So the question was whether we care abo= ut evaluating codec technology or specific implementations. If the former, = then tests should be staged in the same way codec experts evaluate codec technology/tools. If the latter, then tests should be stage= d using the target implementations.

 

I’m not aware of conferencing app= lications which use x264, because it was designed and optimized for transco= ding (dvd rips to blu-ray) not conferencing. Most importantly, x264 cbr mode is inappropriate for conferencing since it is for broadcast = MPEG transport streams that must be absolutely CBR to avoid M2TS-mux overfl= ow or underflow, and it will actually insert filler data instead of real fr= ame data to hit the CBR rate exactly. Looking at the results which show the worst H.264 bitrate (62% above VP8) = in gipsrecstat_1280_720_50_1485kbps.mkv, there is almost as much filler dat= a as real frame data, meaning the true bitrate of real frame data is almost= half what is reported in the results. (See attached if it makes it through.)


I have been using x264 with very good results in my mcu implementation, the= parameters I use are:

    params.rc.i_rc_method      &nbs= p;    =3D X264_RC_ABR;
    params.rc.i_bitrate      &= nbsp;            =3D= bitrate;
    params.rc.i_vbv_max_bitrate =3D bitrate;
    params.rc.i_vbv_buffer_size   =3D bitrate/fps;=
    params.rc.f_vbv_buffer_init    =3D 0;
    params.rc.f_rate_tolerance    =3D 0.1;     params.b_intra_refresh      &nb= sp;    =3D 1;

I have a smooth and constant bitrate near the target bitrate, which is some= thing I still have not been able to do with VP8 encoder yet (if someone now= s the trick, it will be very welcome!).

Best regards
Sergio

--_000_3879D71E758A7E4AA99A35DD8D41D3D90F69B5D3xmbrcdx14ciscoc_-- From kieran618@googlemail.com Thu Apr 4 18:59:57 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 326E221F9665 for ; Thu, 4 Apr 2013 18:59:57 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.977 X-Spam-Level: X-Spam-Status: No, score=-1.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RRtlr7aIPHHs for ; Thu, 4 Apr 2013 18:59:56 -0700 (PDT) Received: from mail-ob0-x242.google.com (mail-ob0-x242.google.com [IPv6:2607:f8b0:4003:c01::242]) by ietfa.amsl.com (Postfix) with ESMTP id 94C0F21F938E for ; Thu, 4 Apr 2013 18:59:56 -0700 (PDT) Received: by mail-ob0-f194.google.com with SMTP id ef5so715804obb.5 for ; Thu, 04 Apr 2013 18:59:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20120113; h=mime-version:x-received:date:message-id:subject:from:to :content-type; bh=y94ykPQ86pIXocIVt8IKCBxQlgYTyTqHdh/0RtSd7jw=; b=kpPd6lbkzpZ2d6RpcaVdd44G8sEQ77DKCUvevLXDffAzQ22mvd6Dz3HvmiDE+a1KKG bQTL7YM3IBZsHPP6i0MaAeatZDDIT77lBOXi3AvfkUTDYBmxQcdngtdvSX8fG75HLVGB lxLlr09YRbe/9aGBGkGW18rH5sQh9GKKSs4cr9nz/A2Ny5yORs12d9vijdsSHvge7DRW kMzE7OXjkt6wjFllqf+Knc0580AHJS8Vsp7Egi0UeutjJzQ4N5dY+/BTVl3DVCu95Fw3 SgFvZxMDnP7RQP1IcOY4yoRF4J5DRAAamC20HhGOUWPB1HT/Ny7ScL7t20Ys5tTN0Hbw QLcA== MIME-Version: 1.0 X-Received: by 10.182.153.164 with SMTP id vh4mr6526286obb.10.1365127196044; Thu, 04 Apr 2013 18:59:56 -0700 (PDT) Received: by 10.76.169.167 with HTTP; Thu, 4 Apr 2013 18:59:55 -0700 (PDT) Date: Fri, 5 Apr 2013 02:59:55 +0100 Message-ID: From: Kieran Kunhya To: rtcweb@ietf.org Content-Type: multipart/alternative; boundary=089e0149c37c97f78304d993710e X-Mailman-Approved-At: Fri, 05 Apr 2013 09:34:00 -0700 Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Apr 2013 02:01:45 -0000 --089e0149c37c97f78304d993710e Content-Type: text/plain; charset=ISO-8859-1 Any of the x264 developers would have been happy to help you choose appropriate settings. I made this suggestion to Harald since major codec comparisons (e.g MSU, EBU) have communicated extensively with all codec vendors. This did not happen and again inappropriate settings have been used like filler bytes, 1 second VBV, large encoder latency (default settings) etc. Also it is complete nonsense to say x264 is not designed for low latency cf - http://x264dev.multimedia.cx/archives/249 I have deployed x264 for low-latency broadcast contribution beating professional encoders in latency and quality and others use it extensively for videoconferencing/cloud-gaming etc. I would politely ask again if the people running codec comparisons ask on the x264-devel mailing list or on #x264dev on Freenode IRC. Kieran Kunhya --089e0149c37c97f78304d993710e Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Any of the x264 developers would have been = happy to help you choose appropriate settings. I made this suggestion to Ha= rald since major codec comparisons (e.g MSU, EBU) have communicated extensi= vely with all codec vendors. This did not happen and again inappropriate se= ttings have been used like filler bytes, 1 second VBV, large encoder latenc= y (default settings) etc.

Also it is complete nonsense to say x264 is not= designed for low latency cf -=A0http://x264dev.m= ultimedia.cx/archives/249
I have deployed x264 for low-latency broadcast contribution = beating professional encoders in latency and quality and others use it exte= nsively for videoconferencing/cloud-gaming etc.

I would politely ask again if the people runnin= g codec comparisons ask on the x264-devel mailing list or on #x264dev on Fr= eenode IRC.

Kieran Kunhya
--089e0149c37c97f78304d993710e-- From randell-ietf@jesup.org Fri Apr 5 10:44:52 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4350021F9797 for ; Fri, 5 Apr 2013 10:44:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.294 X-Spam-Level: X-Spam-Status: No, score=-1.294 tagged_above=-999 required=5 tests=[AWL=-0.655, BAYES_00=-2.599, RCVD_IN_BL_SPAMCOP_NET=1.96] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uzhYm4wXebiy for ; Fri, 5 Apr 2013 10:44:51 -0700 (PDT) Received: from r2-chicago.webserversystems.com (r2-chicago.webserversystems.com [173.236.101.58]) by ietfa.amsl.com (Postfix) with ESMTP id D30EE21F8BE9 for ; Fri, 5 Apr 2013 10:44:51 -0700 (PDT) Received: from pool-98-111-140-34.phlapa.fios.verizon.net ([98.111.140.34]:4642 helo=[192.168.1.12]) by r2-chicago.webserversystems.com with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.80) (envelope-from ) id 1UOAh1-000FjH-05 for rtcweb@ietf.org; Fri, 05 Apr 2013 12:44:51 -0500 Message-ID: <515F0D29.9030805@jesup.org> Date: Fri, 05 Apr 2013 13:43:05 -0400 From: Randell Jesup User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130307 Thunderbird/17.0.4 MIME-Version: 1.0 To: rtcweb@ietf.org References: <515D3FA1.6050305@gmail.com> <515D96A2.1000602@cisco.com> <3879D71E758A7E4AA99A35DD8D41D3D90F69B243@xmb-rcd-x14.cisco.com> <515E1734.90702@gmail.com> <3879D71E758A7E4AA99A35DD8D41D3D90F69B5D3@xmb-rcd-x14.cisco.com> In-Reply-To: <3879D71E758A7E4AA99A35DD8D41D3D90F69B5D3@xmb-rcd-x14.cisco.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - r2-chicago.webserversystems.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - jesup.org Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Apr 2013 17:44:52 -0000 On 4/5/2013 12:24 PM, Mo Zanaty (mzanaty) wrote: > > Check your output x264 streams for fillers. If you see fillers (NAL > unit type 12), you are wasting bandwidth. In the example below, almost > half the bitrate was wasted on fillers and other stuff (SEI) that are > not real frames. Over RTP, you would waste even more than half the > link bandwidth since the small SEIs would incur the full overhead of > separate RTP packets. (40 bytes of RTP/UDP/IP overhead for 10 bytes of > SEI.) > Plus SRTP authentication tag (default is 10 bytes) These are better tests than the ones presented at IETF86, though they aren't perfect either of course. So I'll note that while there may be differences (in favor of either) or specific implementation weaknesses (solvable), I don't think there's a case for saying either H.264 or VP8 are technically insufficient to be an MTI, and either would do to avoid negotiation failure technically. I do consider h.261 to be insufficient, as both the quality level/bitrate and the constrained resolutions would make it unacceptable to use even if it avoided negotiation failure. These opinions were echoed by multiple people in the room (and at previous IETFs). I think the questions on MTI all come down to non-technical issues. -- Randell Jesup randell-ietf@jesup.org From lgeyser@gmail.com Fri Apr 5 11:27:15 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 87A2621F984E for ; Fri, 5 Apr 2013 11:27:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.766 X-Spam-Level: X-Spam-Status: No, score=-1.766 tagged_above=-999 required=5 tests=[AWL=-0.833, BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001, SARE_HTML_USL_OBFU=1.666] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jajESXzt2+rU for ; Fri, 5 Apr 2013 11:27:15 -0700 (PDT) Received: from mail-la0-x22a.google.com (mail-la0-x22a.google.com [IPv6:2a00:1450:4010:c03::22a]) by ietfa.amsl.com (Postfix) with ESMTP id 8879C21F9880 for ; Fri, 5 Apr 2013 11:27:11 -0700 (PDT) Received: by mail-la0-f42.google.com with SMTP id fe20so3766801lab.1 for ; Fri, 05 Apr 2013 11:27:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=2vPWhhb6hvwoz8Ae2u75KwTNcFSgMYX+TVdi1Ba97Dw=; b=a7IR7JSACgXz3CfC/CjSQZT2t+08gnUxFY/AcG8G31BhvT1G1Kyke9Z5HAmCgDnLWP dFunMxvqkXxZr2Hn6HoiEZ9XYp8GFQtvSmPqsEe9K7t/irphFocWPNft7suekvCjOjhZ z+jb6CQaXKJVkvixpv5xzoD5wXSFudwIpAUoUDHcwUM80aGR+RBo21HIDkObt8spc0t9 tcKhEpmUPNznZ/ULYSkwJoPn+aBYi/a+w8aKBpIw/UwDRWyYj4gO1jGpXoXkCVp1Jo6Z lailv8TiG53EnU5dgaiv4lE7i7NZCLYdRtBA6oCfSCMRLLBpklE4s4tssv18NbXvY5Rw X4bw== MIME-Version: 1.0 X-Received: by 10.112.104.103 with SMTP id gd7mr2076590lbb.54.1365186430386; Fri, 05 Apr 2013 11:27:10 -0700 (PDT) Received: by 10.114.177.42 with HTTP; Fri, 5 Apr 2013 11:27:10 -0700 (PDT) In-Reply-To: <515F0D29.9030805@jesup.org> References: <515D3FA1.6050305@gmail.com> <515D96A2.1000602@cisco.com> <3879D71E758A7E4AA99A35DD8D41D3D90F69B243@xmb-rcd-x14.cisco.com> <515E1734.90702@gmail.com> <3879D71E758A7E4AA99A35DD8D41D3D90F69B5D3@xmb-rcd-x14.cisco.com> <515F0D29.9030805@jesup.org> Date: Fri, 5 Apr 2013 20:27:10 +0200 Message-ID: From: Leon Geyser To: Randell Jesup Content-Type: multipart/alternative; boundary=14dae9d682983c4cfd04d9a13cd2 Cc: rtcweb@ietf.org Subject: Re: [rtcweb] New VP8 vs H.264 tests uploaded X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Apr 2013 18:27:15 -0000 --14dae9d682983c4cfd04d9a13cd2 Content-Type: text/plain; charset=ISO-8859-1 H.261 isn't *that* bad. It sure beats Motion JPEG snd ASCII art :) On 5 April 2013 19:43, Randell Jesup wrote: > On 4/5/2013 12:24 PM, Mo Zanaty (mzanaty) wrote: > >> >> Check your output x264 streams for fillers. If you see fillers (NAL unit >> type 12), you are wasting bandwidth. In the example below, almost half the >> bitrate was wasted on fillers and other stuff (SEI) that are not real >> frames. Over RTP, you would waste even more than half the link bandwidth >> since the small SEIs would incur the full overhead of separate RTP packets. >> (40 bytes of RTP/UDP/IP overhead for 10 bytes of SEI.) >> >> > Plus SRTP authentication tag (default is 10 bytes) > > These are better tests than the ones presented at IETF86, though they > aren't perfect either of course. > > So I'll note that while there may be differences (in favor of either) or > specific implementation weaknesses (solvable), I don't think there's a case > for saying either H.264 or VP8 are technically insufficient to be an MTI, > and either would do to avoid negotiation failure technically. I do > consider h.261 to be insufficient, as both the quality level/bitrate and > the constrained resolutions would make it unacceptable to use even if it > avoided negotiation failure. These opinions were echoed by multiple people > in the room (and at previous IETFs). > > I think the questions on MTI all come down to non-technical issues. > > -- > Randell Jesup > randell-ietf@jesup.org > > > ______________________________**_________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/**listinfo/rtcweb > --14dae9d682983c4cfd04d9a13cd2 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable H.261 isn't *that* bad. It sure beats Motion JPEG snd ASCII art :)
<= br>
On 5 April 2013 19:43, Randell Jesup <r= andell-ietf@jesup.org> wrote:
On 4/5/2013 12:24 PM, Mo Z= anaty (mzanaty) wrote:

Check your output x264 streams for fillers. If you see fillers (NAL unit ty= pe 12), you are wasting bandwidth. In the example below, almost half the bi= trate was wasted on fillers and other stuff (SEI) that are not real frames.= Over RTP, you would waste even more than half the link bandwidth since the= small SEIs would incur the full overhead of separate RTP packets. (40 byte= s of RTP/UDP/IP overhead for 10 bytes of SEI.)


Plus SRTP authentication tag (default is 10 bytes)

These are better tests than the ones presented at IETF86, though they aren&= #39;t perfect either of course.

So I'll note that while there may be differences (in favor of either) o= r specific implementation weaknesses (solvable), I don't think there= 9;s a case for saying either H.264 or VP8 are technically insufficient to b= e an MTI, and either would do to avoid negotiation failure technically. =A0= I do consider h.261 to be insufficient, as both the quality level/bitrate a= nd the constrained resolutions would make it unacceptable to use even if it= avoided negotiation failure. These opinions were echoed by multiple people= in the room (and at previous IETFs).

I think the questions on MTI all come down to non-technical issues.

--
Randell Jesup
randell-ietf@je= sup.org


_______________________________________________
rtcweb mailing list
rtcweb@ietf.org = https://www.ietf.org/mailman/listinfo/rtcweb

--14dae9d682983c4cfd04d9a13cd2-- From pkyzivat@alum.mit.edu Fri Apr 5 12:35:40 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 35F9D21F9887 for ; Fri, 5 Apr 2013 12:35:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.387 X-Spam-Level: X-Spam-Status: No, score=-0.387 tagged_above=-999 required=5 tests=[AWL=0.050, BAYES_00=-2.599, FH_RELAY_NODNS=1.451, HELO_MISMATCH_NET=0.611, RDNS_NONE=0.1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Js64LZ-aoGi7 for ; Fri, 5 Apr 2013 12:35:39 -0700 (PDT) Received: from qmta04.westchester.pa.mail.comcast.net (qmta04.westchester.pa.mail.comcast.net [IPv6:2001:558:fe14:43:76:96:62:40]) by ietfa.amsl.com (Postfix) with ESMTP id 8BBCA21F9875 for ; Fri, 5 Apr 2013 12:35:39 -0700 (PDT) Received: from omta19.westchester.pa.mail.comcast.net ([76.96.62.98]) by qmta04.westchester.pa.mail.comcast.net with comcast id LJA51l00127AodY54KbfDU; Fri, 05 Apr 2013 19:35:39 +0000 Received: from Paul-Kyzivats-MacBook-Pro.local ([50.138.229.164]) by omta19.westchester.pa.mail.comcast.net with comcast id LKbe1l00t3ZTu2S3fKbeww; Fri, 05 Apr 2013 19:35:39 +0000 Message-ID: <515F278A.5070102@alum.mit.edu> Date: Sat, 06 Apr 2013 03:35:38 +0800 From: Paul Kyzivat User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <8DFF2C41-FA67-4BB6-B4EB-784CEC2D0DFE@edvina.net> <002b01ce3089$a36a0450$ea3e0cf0$@shockey.us> In-Reply-To: <002b01ce3089$a36a0450$ea3e0cf0$@shockey.us> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20121106; t=1365190539; bh=GUJdr0uagHD0Hgu3ThocDjFm7oEyMQppsFpaQyf4LbU=; h=Received:Received:Message-ID:Date:From:MIME-Version:To:Subject: Content-Type; b=MWSqxjnvnJXK/zowuzcBmLzS2dssojxDUQDVnJZQL3cOyRfW5XJrZicGXN07YhcG6 LUUjJtyfiwE8h9YO3ngcMTWLR5iT5dU41XCtQVrSbAa0M11oJfcbcTYTg5j0thmfMW MG2XdWWlLgT4lZjPAx6YQSJGWK8+HSzrhInjvoCzQPX6YqFqaR+A7VQcPkGDxRvjFW Dq/EEds5cPF98ag+a093YDMlUDjfj0Cqq6R9Q2U0UVzosjS3mdGrBR5r9sRloCUVL9 ty6vk/x9urhF5c+1pvsJ2Cc3+XtInysobJ3t3ZnFdfi7zDAPyCostgSwaRFsRPm5oA GK5gTL78qOBTw== Subject: Re: [rtcweb] Use case for smellovision X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Apr 2013 19:35:40 -0000 Time to start the competition for the mandatory to implement smellovision codec. On 4/4/13 12:38 AM, Richard Shockey wrote: > What are the Intellectual Property Issues with smell-0-vision? Is there > a patent pool here? > > Obviously you need to find out that first before you can define a use case. > > *From:*rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] *On > Behalf Of *Suhas Nandakumar > *Sent:* Wednesday, April 03, 2013 11:40 AM > *To:* Olle E. Johansson > *Cc:* Cullen Jennings (fluffy); rtcweb@ietf.org > *Subject:* Re: [rtcweb] Use case for smellovision > > I think such an application can be embedded in the rtcweb-sensors > attached to the sniff dogs for real-time big data analysis of smell and > hence help solve the crime - world peace > > On Tuesday, April 2, 2013, Olle E. Johansson wrote: > > > 2 apr 2013 kl. 20:37 skrev "Cullen Jennings (fluffy)" > >: > > > > > I beilve everything I read on the web, even on April 1, and > wanted to point out that Googles new search, > > > > https://www.google.com/intl/en/landing/nose/ > > > > Is going to be critical that webrtc support media types other > than voice and video. > > > I do remember Patrik Fältström's first presentation of Internet > Media Types - MIME. > He said that they had attachment types for everything except smell. > > Time to fix that, obviously. > > /O > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > From ted.ietf@gmail.com Fri Apr 5 13:28:46 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EC17C21F98A4 for ; Fri, 5 Apr 2013 13:28:46 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FbknJkIuaqNk for ; Fri, 5 Apr 2013 13:28:46 -0700 (PDT) Received: from mail-wi0-x22c.google.com (mail-wi0-x22c.google.com [IPv6:2a00:1450:400c:c05::22c]) by ietfa.amsl.com (Postfix) with ESMTP id 0F1DE21F983F for ; Fri, 5 Apr 2013 13:28:45 -0700 (PDT) Received: by mail-wi0-f172.google.com with SMTP id hr17so969633wib.5 for ; Fri, 05 Apr 2013 13:28:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:date:message-id:subject:from:to :content-type; bh=PrG5WY80jPsFFgwvoSu412/XGSxVP3C8UXNx2yNjmcc=; b=qcjDpOVpS6ciejK9X/hms7XQN+N5StY6/s1pzxdUk1gPkd0a0B7jER4eCakSNXcG/X mZjPLNKQT4cCCOx+pVbqpGjYtDpHLZDIsv+OIvwRvGrjyeyxB6y7ws3kKLVJXbfMYBbE 5+7bGOlm/3Kkj0CZedT1TFp5zRQ09CjzPn2lsdb5fGyryijxsA6hWbWzz18Q67P0ySlf 6s1EK8mhIjKKjccyJyq6unjwkM/jGdVBemOL9D70CRSINLIrVzNUYCx+Oliuz5J/J6Lu +eJvd4aF7OpZzAP/Q4sVrSFrTHLtyYb5MAW66wybpxINIIkrJ6qnpM6FN1twI8i019oW VUYQ== MIME-Version: 1.0 X-Received: by 10.180.189.205 with SMTP id gk13mr906511wic.25.1365193725251; Fri, 05 Apr 2013 13:28:45 -0700 (PDT) Received: by 10.227.24.7 with HTTP; Fri, 5 Apr 2013 13:28:45 -0700 (PDT) Date: Fri, 5 Apr 2013 13:28:45 -0700 Message-ID: From: Ted Hardie To: rtcweb@ietf.org Content-Type: multipart/alternative; boundary=001a11c366d00b159604d9a2ef46 Subject: [rtcweb] Uploaded unified minutes for both days of IETF 86 meetings X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Apr 2013 20:28:47 -0000 --001a11c366d00b159604d9a2ef46 Content-Type: text/plain; charset=ISO-8859-1 Howdy, We have now uploaded unified minutes with the corrections we received on the list; thanks to all who reviewed. If you have not yet done so, there is still time to update, so please take a look. thanks, Ted Hardie, for the chairs. --001a11c366d00b159604d9a2ef46 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Howdy,

We have now uploaded unified minutes with the corrections we = received on the list; thanks to all who reviewed.=A0 If you have not yet do= ne so, there is still time to update, so please take a look.

thanks,=

Ted Hardie, for the chairs.
--001a11c366d00b159604d9a2ef46-- From suhasietf@gmail.com Fri Apr 5 20:53:57 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7C1C221F940E for ; Fri, 5 Apr 2013 20:53:57 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.766 X-Spam-Level: X-Spam-Status: No, score=-1.766 tagged_above=-999 required=5 tests=[AWL=-0.833, BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001, SARE_HTML_USL_OBFU=1.666] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rsYnjs13FwKq for ; Fri, 5 Apr 2013 20:53:56 -0700 (PDT) Received: from mail-wi0-x230.google.com (mail-wi0-x230.google.com [IPv6:2a00:1450:400c:c05::230]) by ietfa.amsl.com (Postfix) with ESMTP id 94AFA21F940B for ; Fri, 5 Apr 2013 20:53:55 -0700 (PDT) Received: by mail-wi0-f176.google.com with SMTP id hm14so1141478wib.9 for ; Fri, 05 Apr 2013 20:53:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=QQksJx+B8SsZkoRwF1bK8S/QBHssF9I/rDVn/hLTpvg=; b=CMVHFWcJTPzFxZTapj7zlFjzXC+yKga+M2PkcsLOJFJdO6Bazm+3XQ3f3pWP4C5qrx y4pM8sXl+aFCsLlrF0mLy1+0yaxWDcLxn4glo8tIR2bySX0KUua4vZUroB8za086Eh4E vjjrJXGYhdY5tzmAJflkUCakcwETAtCxNUAoGSeE6D3T8Y9zTuuYtm4YsJGsLUifzF1Y kZuvqIGPVEzzcXa5ieAveDxb1LPurqUZ7TzskHOlCwWPAXtgyxTp95Sx0b01t03L9hTs eJC/hjVmcdfQ3I5e9aXX9XsZ7RR22clA6XCTNFG9iFf5tyQ6prMQoZkBxmpSzAQx11LX 7ecQ== MIME-Version: 1.0 X-Received: by 10.180.85.103 with SMTP id g7mr2185663wiz.23.1365220434278; Fri, 05 Apr 2013 20:53:54 -0700 (PDT) Received: by 10.194.179.10 with HTTP; Fri, 5 Apr 2013 20:53:54 -0700 (PDT) In-Reply-To: <515F278A.5070102@alum.mit.edu> References: <8DFF2C41-FA67-4BB6-B4EB-784CEC2D0DFE@edvina.net> <002b01ce3089$a36a0450$ea3e0cf0$@shockey.us> <515F278A.5070102@alum.mit.edu> Date: Fri, 5 Apr 2013 20:53:54 -0700 Message-ID: From: Suhas Nandakumar To: Paul Kyzivat Content-Type: multipart/alternative; boundary=f46d043bdce606a9ad04d9a92795 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] Use case for smellovision X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 06 Apr 2013 03:53:57 -0000 --f46d043bdce606a9ad04d9a92795 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Do we need an encoder and decoder .. I think JSON encapsulated binary representation of smell is just enough.... On Fri, Apr 5, 2013 at 12:35 PM, Paul Kyzivat wrote= : > Time to start the competition for the mandatory to implement smellovision > codec. > > > On 4/4/13 12:38 AM, Richard Shockey wrote: > >> What are the Intellectual Property Issues with smell-0-vision? Is there >> a patent pool here? >> >> Obviously you need to find out that first before you can define a use >> case. >> >> *From:*rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.**org] >> *On >> Behalf Of *Suhas Nandakumar >> *Sent:* Wednesday, April 03, 2013 11:40 AM >> *To:* Olle E. Johansson >> *Cc:* Cullen Jennings (fluffy); rtcweb@ietf.org >> *Subject:* Re: [rtcweb] Use case for smellovision >> >> >> I think such an application can be embedded in the rtcweb-sensors >> attached to the sniff dogs for real-time big data analysis of smell and >> hence help solve the crime - world peace >> >> On Tuesday, April 2, 2013, Olle E. Johansson wrote: >> >> >> 2 apr 2013 kl. 20:37 skrev "Cullen Jennings (fluffy)" >> >: >> >> >> > >> > I beilve everything I read on the web, even on April 1, and >> wanted to point out that Googles new search, >> > >> > https://www.google.com/intl/**en/landing/nose/ >> > >> > Is going to be critical that webrtc support media types other >> than voice and video. >> > >> I do remember Patrik F=E4ltstr=F6m's first presentation of Internet >> Media Types - MIME. >> He said that they had attachment types for everything except smell. >> >> Time to fix that, obviously. >> >> /O >> ______________________________**_________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/**listinfo/rtcweb >> >> >> >> >> ______________________________**_________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/**listinfo/rtcweb >> >> > ______________________________**_________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/**listinfo/rtcweb > --f46d043bdce606a9ad04d9a92795 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Do we need an encoder and decoder =A0.. I think JSON encap= sulated binary representation of smell is just enough....


On Fri, Apr 5, 2013 at = 12:35 PM, Paul Kyzivat <pkyzivat@alum.mit.edu> wrote:
Time to start the competition for the mandat= ory to implement smellovision codec.


On 4/4/13 12:38 AM, Richard Shockey wrote:
What are the Intellectual Property Issues with smell-0-vision? =A0Is there<= br> a patent pool here?

Obviously you need to find out that first before you can define a use case.=

*From:*rtcweb-= bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] *On
Behalf Of *Suhas Nandakumar
*Sent:* Wednesday, April 03, 2013 11:40 AM
*To:* Olle E. Johansson
*Cc:* Cullen Jennings (fluffy); rtcweb@ietf.org
*Subject:* Re: [rtcweb] Use case for smellovision


I think such an application can be embedded in the rtcweb-sensors
attached to the sniff dogs for real-time big data analysis of smell and
hence help solve the crime - =A0world peace

On Tuesday, April 2, 2013, Olle E. Johansson wrote:


=A0 =A0 2 apr 2013 kl. 20:37 skrev "Cullen Jennings (fluffy)"
=
=A0 =A0 <fluffy@ci= sco.com <javascript:;>>:


=A0 =A0 =A0>
=A0 =A0 =A0> I beilve everything I read on the web, even on April 1, and=
=A0 =A0 wanted to point out that Googles new search,
=A0 =A0 =A0>
=A0 =A0 =A0> https://www.google.com/intl/en/landing/nose/
=A0 =A0 =A0>
=A0 =A0 =A0> Is going to be critical that webrtc support media types oth= er
=A0 =A0 than voice and video.
=A0 =A0 =A0>
=A0 =A0 I do remember Patrik F=E4ltstr=F6m's first presentation of Inte= rnet
=A0 =A0 Media Types - MIME.
=A0 =A0 He said that they had attachment types for everything except smell.=

=A0 =A0 Time to fix that, obviously.

=A0 =A0 /O
=A0 =A0 _______________________________________________
=A0 =A0 rtcweb mailing list
=A0 =A0 rtcweb@ietf.or= g <javascript:;>
=A0 =A0 https://www.ietf.org/mailman/listinfo/rtcweb




_______________________________________________
rtcweb mailing list
rtcweb@ietf.org = https://www.ietf.org/mailman/listinfo/rtcweb


_______________________________________________
rtcweb mailing list
rtcweb@ietf.org = https://www.ietf.org/mailman/listinfo/rtcweb

--f46d043bdce606a9ad04d9a92795-- From stpeter@stpeter.im Fri Apr 5 21:06:41 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 143A921F968A for ; Fri, 5 Apr 2013 21:06:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.599 X-Spam-Level: X-Spam-Status: No, score=-102.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cUdXYYE5uZaE for ; Fri, 5 Apr 2013 21:06:40 -0700 (PDT) Received: from stpeter.im (mailhost.stpeter.im [207.210.219.225]) by ietfa.amsl.com (Postfix) with ESMTP id 8048C21F967F for ; Fri, 5 Apr 2013 21:06:38 -0700 (PDT) Received: from [192.168.1.9] (unknown [71.237.13.154]) (Authenticated sender: stpeter) by stpeter.im (Postfix) with ESMTPSA id 0D4FC406D9; Fri, 5 Apr 2013 22:16:30 -0600 (MDT) Message-ID: <515F9F4C.8000604@stpeter.im> Date: Fri, 05 Apr 2013 22:06:36 -0600 From: Peter Saint-Andre User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: Suhas Nandakumar References: <8DFF2C41-FA67-4BB6-B4EB-784CEC2D0DFE@edvina.net> <002b01ce3089$a36a0450$ea3e0cf0$@shockey.us> <515F278A.5070102@alum.mit.edu> In-Reply-To: X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] Use case for smellovision X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 06 Apr 2013 04:06:41 -0000 Clearly the IETF community lacks the expertise to judge the quality of olfactory codecs. Tests of perceived fidelity ought to be left up to the experts, i.e., dogs. This would give new meaning to MUSH[ra] testing. On 4/5/13 9:53 PM, Suhas Nandakumar wrote: > Do we need an encoder and decoder .. I think JSON encapsulated binary > representation of smell is just enough.... > > > On Fri, Apr 5, 2013 at 12:35 PM, Paul Kyzivat wrote: > >> Time to start the competition for the mandatory to implement smellovision >> codec. >> >> >> On 4/4/13 12:38 AM, Richard Shockey wrote: >> >>> What are the Intellectual Property Issues with smell-0-vision? Is there >>> a patent pool here? >>> >>> Obviously you need to find out that first before you can define a use >>> case. >>> >>> *From:*rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.**org] >>> *On >>> Behalf Of *Suhas Nandakumar >>> *Sent:* Wednesday, April 03, 2013 11:40 AM >>> *To:* Olle E. Johansson >>> *Cc:* Cullen Jennings (fluffy); rtcweb@ietf.org >>> *Subject:* Re: [rtcweb] Use case for smellovision >>> >>> >>> I think such an application can be embedded in the rtcweb-sensors >>> attached to the sniff dogs for real-time big data analysis of smell and >>> hence help solve the crime - world peace >>> >>> On Tuesday, April 2, 2013, Olle E. Johansson wrote: >>> >>> >>> 2 apr 2013 kl. 20:37 skrev "Cullen Jennings (fluffy)" >>> >: >>> >>> >>> > >>> > I beilve everything I read on the web, even on April 1, and >>> wanted to point out that Googles new search, >>> > >>> > https://www.google.com/intl/**en/landing/nose/ >>> > >>> > Is going to be critical that webrtc support media types other >>> than voice and video. >>> > >>> I do remember Patrik Fältström's first presentation of Internet >>> Media Types - MIME. >>> He said that they had attachment types for everything except smell. >>> >>> Time to fix that, obviously. >>> >>> /O >>> ______________________________**_________________ >>> rtcweb mailing list >>> rtcweb@ietf.org >>> https://www.ietf.org/mailman/**listinfo/rtcweb >>> >>> >>> From ron@debian.org Sat Apr 6 05:56:34 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D08A621F8E06 for ; Sat, 6 Apr 2013 05:56:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.423 X-Spam-Level: X-Spam-Status: No, score=-1.423 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FH_HOST_EQ_D_D_D_D=0.765, HOST_MISMATCH_NET=0.311, RDNS_DYNAMIC=0.1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Gb8b-DQjd+eU for ; Sat, 6 Apr 2013 05:56:34 -0700 (PDT) Received: from ipmail05.adl6.internode.on.net (ipmail05.adl6.internode.on.net [IPv6:2001:44b8:8060:ff02:300:1:6:5]) by ietfa.amsl.com (Postfix) with ESMTP id 1D96621F8DCF for ; Sat, 6 Apr 2013 05:56:33 -0700 (PDT) Received: from ppp118-210-202-56.lns20.adl6.internode.on.net (HELO audi.shelbyville.oz) ([118.210.202.56]) by ipmail05.adl6.internode.on.net with ESMTP; 06 Apr 2013 23:26:32 +1030 Received: from localhost (localhost [127.0.0.1]) by audi.shelbyville.oz (Postfix) with ESMTP id 5956D4F8F3 for ; Sat, 6 Apr 2013 23:26:29 +1030 (CST) X-Virus-Scanned: Debian amavisd-new at audi.shelbyville.oz Received: from audi.shelbyville.oz ([127.0.0.1]) by localhost (audi.shelbyville.oz [127.0.0.1]) (amavisd-new, port 10024) with LMTP id BpUPQITd77hB for ; Sat, 6 Apr 2013 23:26:28 +1030 (CST) Received: by audi.shelbyville.oz (Postfix, from userid 1000) id B5AB74F902; Sat, 6 Apr 2013 23:26:28 +1030 (CST) Date: Sat, 6 Apr 2013 23:26:28 +1030 From: Ron To: rtcweb@ietf.org Message-ID: <20130406125628.GB29460@audi.shelbyville.oz> References: <8DFF2C41-FA67-4BB6-B4EB-784CEC2D0DFE@edvina.net> <002b01ce3089$a36a0450$ea3e0cf0$@shockey.us> <515F278A.5070102@alum.mit.edu> <515F9F4C.8000604@stpeter.im> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <515F9F4C.8000604@stpeter.im> User-Agent: Mutt/1.5.20 (2009-06-14) Subject: Re: [rtcweb] Use case for smellovision X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 06 Apr 2013 12:56:34 -0000 On Fri, Apr 05, 2013 at 10:06:36PM -0600, Peter Saint-Andre wrote: > Clearly the IETF community lacks the expertise to judge the quality of > olfactory codecs. Tests of perceived fidelity ought to be left up to the > experts, i.e., dogs. This would give new meaning to MUSH[ra] testing. Apparently, cats, in general, actually have a more powerful sense of smell than most dogs do ... Which may firmly place this back in the domain of interest of the Internet Community :> Stay tuned for Smell-you tube. However unless there is an IETF VINTNER working group that I'm unaware of, we are way behind on this. Encoders at least have already been commercially available for quite some time now. Though decoders you may still have to scratch to operate ... http://www.csiro.au/en/Outcomes/Food-and-Agriculture/Determining-the-quality-of-wine-grapes-from-flavour-and-aroma-analysis.aspx http://www.csiro.au/en/Outcomes/Food-and-Agriculture/Cybernose_FFF_Overview.aspx Cybernose is a registered trademark of CSIRO, Ron From prvs=08103f7bc8=gmartincocher@blackberry.com Mon Apr 8 09:10:36 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3D3F421F9374 for ; Mon, 8 Apr 2013 09:10:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.202 X-Spam-Level: X-Spam-Status: No, score=-6.202 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, GB_I_LETTER=-2, HTML_MESSAGE=0.001, J_BACKHAIR_21=1, MIME_QP_LONG_LINE=1.396, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Mlrx27cOxyhm for ; Mon, 8 Apr 2013 09:10:33 -0700 (PDT) Received: from mhs060cnc.rim.net (mhs060cnc.rim.net [208.65.73.34]) by ietfa.amsl.com (Postfix) with ESMTP id 9C54621F938A for ; Mon, 8 Apr 2013 09:10:32 -0700 (PDT) X-AuditID: 0a41282f-b7f1a6d0000054a3-55-5162e84ba7bf Received: from XCT103CNC.rim.net (smtp-pop.rim.net [10.65.161.203]) by mhs060cnc.rim.net (SBG) with SMTP id F2.6C.21667.B48E2615; Mon, 8 Apr 2013 10:54:51 -0500 (CDT) Received: from XMB106BCNC.rim.net ([fe80::99b8:8d0e:cdcd:c00d]) by XCT103CNC.rim.net ([fe80::b8:d5e:26a5:f4d6%17]) with mapi id 14.02.0328.009; Mon, 8 Apr 2013 11:54:51 -0400 From: Gaelle Martin-Cocher To: Ted Hardie , "rtcweb@ietf.org" Thread-Topic: [rtcweb] Uploaded unified minutes for both days of IETF 86 meetings Thread-Index: AQHOMjwy+L3NVZ7OuEeDDzWE1rlyipjMd+mw Date: Mon, 8 Apr 2013 15:54:50 +0000 Message-ID: <92D0D52F3A63344CA478CF12DB0648AA2655AD06@XMB106BCNC.rim.net> References: In-Reply-To: Accept-Language: fr-FR, en-CA, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.65.160.249] Content-Type: multipart/alternative; boundary="_000_92D0D52F3A63344CA478CF12DB0648AA2655AD06XMB106BCNCrimne_" MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrFKsWRmVeSWpSXmKPExsXC5bjwtK73i6RAg4dnNC3W/mtnt2ica+fA 5LFz1l12jyVLfjIFMEU1MNokJZaUBWem5+nb2STm5eWXJJakKqSkFifbKvmkpifmKAQUZZYl JlcquGQWJ+ckZuamFikpZKbYKpkoKRTkJCan5qbmldgqJRYUpOalKNlxKWAAG6CyzDyF1Lzk /JTMvHRbJc9gf10LC1NLXUMlO92ETp6MHe+fMRe8XcJY0XfmAnsD48HpjF2MnBwSAiYSC1+8 Z4OwxSQu3FsPZHNxCAmsZJRoeNAO5WxilJh58Dc7SBWbgKXE/1d7WEBsEQEPiU1/f7OC2MIC QRJPDt9lhIgHS/x92glVYySx8fIZZhCbRUBFYvWzO0A2BwevgKfE/LVqIGEhgQCJ97vuMYHY nAKBEq9272EHKWEEKj/5NBwkzCwgLnHryXwmiDsFJJbsOc8MYYtKvHz8jxXCVpTY++woE0R9 vsSOP3PBLuAVEJQ4OfMJywRGkVlIRs1CUjYLSRlEXE/ixtQpbBC2tsSyha+ZIWxdiRn/DrEg iy9gZF/FKJibUWxgZpCcl6xXlJmrl5dasokRnD409Hcwvn1vcYhRgINRiYdX53JSoBBrYllx Ze4hRgkOZiUR3tazQCHelMTKqtSi/Pii0pzU4kOMQcCwmsgsxZ2cD0xteSXxxgYGRHKUxHl/ C0cHCgmkAxNZdmpqQWoRzFAmDk6QpVxSIsXAdJRalFhakhEPSprxxcC0KdXAeNhNZPes8zGb ft2/aHP67KZFs7atnaL38qbEwTMb5ibJtFvYXhAxXXb8eMDE8oMO/Quf6FxL28lUeXxas3rx 6+/a+Z8s75dq350btJ6zcMbR29sLG7+tntXq69fLcGB+oWBC8xKF82nbZiVtKXvINUf0lNCH Rl/p6Qo7NJ5mfqjfxdv+Oyfwba4SS3FGoqEWc1FxIgAi82g1bQMAAA== Subject: Re: [rtcweb] Uploaded unified minutes for both days of IETF 86 meetings X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 Apr 2013 16:10:36 -0000 --_000_92D0D52F3A63344CA478CF12DB0648AA2655AD06XMB106BCNCrimne_ Content-Type: text/plain; charset="iso-8859-1" content-transfer-encoding: quoted-printable Dear all, Some corrections made by Magnus and sent to the list on April 2nd were lost;= page 3 the first changes under the VP8 IPR presentation should read: VP8 IPR: http://ww= w.ietf.org/proceedings/86/slides/slides-86-rtcweb-10.pdf Serge Lachapelle presenting Gaelle reiterated that more details are needed on the recent announcement an= d noted that there are more patent holders for H.264 in the ITU-T database t= hat are not part of MPEG-LA. She asked if the IETF could send letters to so= licit information from these IPR-holders. Also, please see below some corrections/clarifications: In the same section: The MPEG-LA pool is a subset. She re-iterated her view that in light of the= answers provided by the area directors, the IETF is not the place for clari= fying this. In the section: Mandatory to Implement Video Codec discussion VP8 Technical: http://www.ietf.org/proceedings/86/slides/slides-86-rtcweb-= 9.pdf Harald Alvestrand presenting .... Gaelle then spoke, saying that in light of the inaccuracy of the tests and r= elated data the venue is wrong, that MPEG is the right place to perform tho= se tests and IETF should rely on MPEG results before making a decision. She= wants to be sure that the tests are accurate, and that the test set and met= hodology used in IETF are problematic. In the last section: It was clearly indicated that additional questions should not be the one tha= t were already asked during the meeting or sent on the reflector. (Some of t= hese are still pending answers). Sense of the room query: http://www.ietf= .org/proceedings/86/slides/slides-86-rtcweb-14.pdf Robert Sparks (as a favor to the chairs) The questions to be asked were put on the slides. If you can't answer these= question, think about what you really need. Come articulate at the mic aft= er the questions, issues or questions that have not already being posted on= the reflector or that have not been raised during the meeting. Thank you Sincerely, Ga=EBlle From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of= Ted Hardie Sent: Friday, April 05, 2013 4:29 PM To: rtcweb@ietf.org Subject: [rtcweb] Uploaded unified minutes for both days of IETF 86 meetings Howdy, We have now uploaded unified minutes with the corrections we received on the= list; thanks to all who reviewed. If you have not yet done so, there is st= ill time to update, so please take a look. thanks, Ted Hardie, for the chairs. --------------------------------------------------------------------- This transmission (including any attachments) may contain confidential infor= mation, privileged material (including material protected by the solicitor-c= lient or other applicable privileges), or constitute non-public information.= Any use of this information by anyone other than the intended recipient is= prohibited. If you have received this transmission in error, please immedia= tely reply to the sender and delete this information from your system. Use,= dissemination, distribution, or reproduction of this transmission by uninte= nded recipients is not authorized and may be unlawful. --_000_92D0D52F3A63344CA478CF12DB0648AA2655AD06XMB106BCNCrimne_ Content-Type: text/html; charset="iso-8859-1" content-transfer-encoding: quoted-printable

Dear all,=

 

Some corrections made by Ma= gnus and sent to the list on April 2nd were lost; page 3 the firs= t changes under the VP8 IPR presentation should read:

VP8 IPR: http://www.ietf.org/proceedings/86/slides/slides-86-rtcweb= -10.pdf

Serge Lachapelle presenting

 

Gaelle reiterated that more details are needed on the= recent announcement and noted that there are more patent holders for H.2= 64 in the ITU-T database that are not part of MPEG-LA.  She asked if the IETF could send letter= s to solicit information from these IPR-holders. 

 

 

Also, please see below some= corrections/clarifications:

In the same section:

The MPEG-LA pool is a subset.  She re-iterated h= er view that in light of the answers provided by the area directors,= the IETF is not the place for clarifying this. 

 

In the section:<= /span>

Mandatory to Implement Video Codec discussion

VP8 Technical: http= ://www.ietf.org/proceedings/86/<= span style=3D"color:#1155CC">slides/slides-86-rtcweb<= /a>-9.pdf

Harald Alvestrand presenting

….<= /p>

Gaelle then spoke, saying that in light of the ina= ccuracy of the tests and related data the venue is wrong, that  MPE= G is the right place to perform those tests and IETF should rely on MPEG= results before making a decision.  She wants to be sure that the tests are accurate, and that the test set and= methodology used in IETF are problematic.

 

In the last section:

It was clearly indicated th= at additional questions should not be the one that were already asked during= the meeting or sent on the reflector. (Some of these are still pending answers).

 

Sense of the room query: http= ://www.ietf.org/proceedings/86/<= span style=3D"color:#1155CC">slides/slides-86-rtcweb<= /a>-14.pdf

Robert Sparks (as a favor to the chairs)

 

The questions to be asked were put on the slides.&nbs= p; If you can’t answer these question, think about what you really nee= d.  Come articulate at the mic after the questions, issues or questions that have not already being posted on the reflector o= r that have not been raised during the meeting. 

 

Thank you=

Sincerely,

Ga=EBlle<= /p>

 

 

From: rtcweb-boun= ces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of Ted Hardie
Sent: Friday, April 05, 2013 4:29 PM
To: rtcweb@ietf.org
Subject: [rtcweb] Uploaded unified minutes for both days of IETF 86 m= eetings

 

Howdy,

We have now uploaded unified minutes with the corrections we received on the= list; thanks to all who reviewed.  If you have not yet done so, there= is still time to update, so please take a look.

thanks,

Ted Hardie, for the chairs.

---------------------------------------------------------------------
This transmission (including any attachments) may contain confidential infor= mation, privileged material (including material protected by the solicitor-c= lient or other applicable privileges), or constitute non-public information.= Any use of this information by anyone other than the intended recipient is= prohibited. If you have received this transmission in error, please immedia= tely reply to the sender and delete this information from your system. Use,= dissemination, distribution, or reproduction of this transmission by uninte= nded recipients is not authorized and may be unlawful. --_000_92D0D52F3A63344CA478CF12DB0648AA2655AD06XMB106BCNCrimne_-- From ted.ietf@gmail.com Mon Apr 8 10:24:16 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 52FC421F8678 for ; Mon, 8 Apr 2013 10:24:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.599 X-Spam-Level: X-Spam-Status: No, score=-3.599 tagged_above=-999 required=5 tests=[AWL=1.000, BAYES_00=-2.599, GB_I_LETTER=-2, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fErpf5brc7up for ; Mon, 8 Apr 2013 10:24:14 -0700 (PDT) Received: from mail-ie0-x229.google.com (mail-ie0-x229.google.com [IPv6:2607:f8b0:4001:c03::229]) by ietfa.amsl.com (Postfix) with ESMTP id C68EA21F861B for ; Mon, 8 Apr 2013 10:24:11 -0700 (PDT) Received: by mail-ie0-f169.google.com with SMTP id qd14so7402851ieb.28 for ; Mon, 08 Apr 2013 10:24:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=Bk3oxiXg+2esjNFqOifNl5J4/we4jOApQa7V2NcL1ng=; b=QVIA/ZyV2l1qZ4tqOltv+iv79UpWDmm9LQAG64rm/qhLdva3HNlWclqYzqo0FQcLkA 0nJj9nuZWOSCaGjJhc7zsTcG5os7kgI4gJbRRZFIEQ9UyZg4JTrPC21WYMbbzcbX+QX8 Ey9a0oemXSnNaktt4Y0Hu3S1zhd1tjZQqzMDXMvAIre5jViEZ7atymGRUbmf7k6RPp06 TRU2nIBMu+arspP802haroQWkMkUOgGUJmu21jSOYEMQGKF+8rPbjsuC6A/WdZVKXq6x 7DjILYikYqTiGcOSpgyrtY89Q8t37rmlqVyAD+E0LFlCl+/DRmT7LVPXGoHoeYXDIGbi 1Bow== MIME-Version: 1.0 X-Received: by 10.50.36.169 with SMTP id r9mr7595562igj.96.1365441845158; Mon, 08 Apr 2013 10:24:05 -0700 (PDT) Received: by 10.43.135.202 with HTTP; Mon, 8 Apr 2013 10:24:05 -0700 (PDT) In-Reply-To: <92D0D52F3A63344CA478CF12DB0648AA2655AD06@XMB106BCNC.rim.net> References: <92D0D52F3A63344CA478CF12DB0648AA2655AD06@XMB106BCNC.rim.net> Date: Mon, 8 Apr 2013 10:24:05 -0700 Message-ID: From: Ted Hardie To: Gaelle Martin-Cocher Content-Type: multipart/alternative; boundary=14dae934032b247afa04d9dcb488 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] Uploaded unified minutes for both days of IETF 86 meetings X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 Apr 2013 17:24:16 -0000 --14dae934032b247afa04d9dcb488 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Thanks for pointing these out; they'll get fixed in the next update. Ted On Mon, Apr 8, 2013 at 8:54 AM, Gaelle Martin-Cocher < gmartincocher@blackberry.com> wrote: > Dear all,**** > > ** ** > > Some corrections made by Magnus and sent to the list on April 2nd were > lost; page 3 the first changes under the VP8 IPR presentation should read= : > **** > > VP8 IPR: http > :// ww= w > . ietf= > . org<= http://www.ietf.org/proceedings/86/slides/slides-86-rtcweb-10.pdf> > / > proceedings > /86/ > slides > / > slides > -86- > rtcweb > -10. > pdf **= * > * > > Serge Lachapelle presenting**** > > ** ** > > Gaelle reiterated that more details are needed on the recent announcement > and noted that there are more patent holders for H.*264 in the ITU-T > database* that are not *part of* MPEG*-LA*. She asked if the IETF could > send letters to solicit information from *these IPR-holders.* **** > > ** ** > > ** ** > > Also, please see below some corrections/clarifications:**** > > In the same section:**** > > The MPEG-LA pool is a subset. She re-iterated her view that* in light of > the answers provided by the area directors*, the IETF is not the place > for clarifying this. **** > > ** ** > > In the section:**** > > Mandatory to Implement Video Codec discussion**** > > VP8 Technical: http > :// www= > . ietf<= http://www.ietf.org/proceedings/86/slides/slides-86-rtcweb-9.pdf> > . org > / > proceedings > /86/ > slides = / > slides > -86- > rtcweb > -9. pdf= > **** > > Harald Alvestrand presenting**** > > =85.**** > > Gaelle then spoke, saying that *in light of the inaccuracy of the tests > and related data* the venue is wrong, that MPEG is the right place* to > perform those tests and IETF should rely on MPEG results before making a > decision*. She wants to be sure that the tests are accurate, and that > the test set and methodology used in IETF are problematic.**** > > ** ** > > In the last section:**** > > It was clearly indicated that additional questions should not be the one > that were already asked during the meeting or sent on the reflector. (Som= e > of these are still pending answers).**** > > ** ** > > Sense of the room query: http > :// www= > . ietf<= http://www.ietf.org/proceedings/86/slides/slides-86-rtcweb-14.pd> > . org > / > proceedings > /86/ > slides = / > slides > -86- > rtcweb > -14. pd= > f**** > > Robert Sparks (as a favor to the chairs)**** > > ** ** > > The questions to be asked were put on the slides. If you can=92t answer > these question, think about what you really need. Come articulate at the > mic after the questions, *issues or questions that have not already being > posted on the reflector or that have not been raised during the meeting*. > **** > > ** ** > > Thank you**** > > Sincerely,**** > > Ga=EBlle**** > > ** ** > > ** ** > > *From:* rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] *On > Behalf Of *Ted Hardie > *Sent:* Friday, April 05, 2013 4:29 PM > *To:* rtcweb@ietf.org > *Subject:* [rtcweb] Uploaded unified minutes for both days of IETF 86 > meetings**** > > ** ** > > Howdy, > > We have now uploaded unified minutes with the corrections we received on > the list; thanks to all who reviewed. If you have not yet done so, there > is still time to update, so please take a look. > > thanks, > > Ted Hardie, for the chairs.**** > --------------------------------------------------------------------- > This transmission (including any attachments) may contain confidential > information, privileged material (including material protected by the > solicitor-client or other applicable privileges), or constitute non-publi= c > information. Any use of this information by anyone other than the intende= d > recipient is prohibited. If you have received this transmission in error, > please immediately reply to the sender and delete this information from > your system. Use, dissemination, distribution, or reproduction of this > transmission by unintended recipients is not authorized and may be > unlawful. > --14dae934032b247afa04d9dcb488 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Thanks for pointing these out; they'll get fixed in the next update.
Ted

On Mon, Apr 8, 2013 at 8:54 AM, = Gaelle Martin-Cocher <gmartincocher@blackberry.com> wrote:

Dear all,

=A0<= /p>

Some corrections made by = Magnus and sent to the list on April 2nd were lost; page 3 the f= irst changes under the VP8 IPR presentation should read:

VP8 IPR: http://www.ietf= .org/proceedings/86/slides/slides-86-= rtcweb-10.pdf

Serge Lachapelle presenting

=A0

Gaelle reiterated that more details are needed on th= e recent announcement and noted that there are more patent holders for H.264 in the ITU-T database that are not part of MPEG-LA.=A0 She asked if the IETF could send letters = to solicit information from these IPR-holders.=A0

=A0

=A0<= /p>

Also, please see below so= me corrections/clarifications:

In the same section:

The MPEG-LA pool is a subset.=A0 She re-iterated her= view that in light of the answers provided by the area directors, t= he IETF is not the place for clarifying this.=A0

=A0<= /p>

In the section:=

Mandatory to Implement Video Codec discussion=

VP8 Technical: http://www.<= /span>ietf= .org/proceedings/86/= slides/= slides-86-rtcweb-9.pdf

Harald Alvestrand presenting

=85.=

Gaelle then spoke, saying that in light of the in= accuracy of the tests and related data the venue is wrong, that=A0 MPEG= is the right place to perform those tests and IETF should rely on MPEG = results before making a decision.=A0 She wants to be sure that the tests are accurate, and that the test set an= d methodology used in IETF are problematic.

=A0<= /p>

In the last section:

It was clearly indicated = that additional questions should not be the one that were already asked dur= ing the meeting or sent on the reflector. (Some of these are still pending answers).

=A0<= /p>

Sense of the room query: http://www.<= /span>ietf= .org/proceedings/86/= slides/= slides-86-rtcweb-14.pdf

Robert Sparks (as a favor to the chairs)

=A0

The questions to be asked were put on the slides.=A0= If you can=92t answer these question, think about what you really need.=A0= Come articulate at the mic after the questions, issues or questions that have not already being posted on the reflector = or that have not been raised during the meeting.=A0

=A0<= /p>

Thank you

Sincerely,<= /span>

Ga=EBlle

=A0<= /p>

=A0<= /p>

From: rtcweb-bounces@ietf.o= rg [mailto:rtcweb-bounces@ietf.org] On Behalf Of Ted Hardie
Sent: Friday, April 05, 2013 4:29 PM
To: rtcweb@ietf= .org
Subject: [rtcweb] Uploaded unified minutes for both days of IETF 86 = meetings

=A0

Howdy,

We have now uploaded unified minutes with the corrections we received on th= e list; thanks to all who reviewed.=A0 If you have not yet done so, there i= s still time to update, so please take a look.

thanks,

Ted Hardie, for the chairs.

---------------------------------------------------------------------
This transmission (including any attachments) may contain confidential info= rmation, privileged material (including material protected by the solicitor= -client or other applicable privileges), or constitute non-public informati= on. Any use of this information by anyone other than the intended recipient= is prohibited. If you have received this transmission in error, please imm= ediately reply to the sender and delete this information from your system. = Use, dissemination, distribution, or reproduction of this transmission by u= nintended recipients is not authorized and may be unlawful.

--14dae934032b247afa04d9dcb488-- From bernard_aboba@hotmail.com Mon Apr 8 12:13:14 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A6EDF21F94AF for ; Mon, 8 Apr 2013 12:13:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.249 X-Spam-Level: X-Spam-Status: No, score=-102.249 tagged_above=-999 required=5 tests=[AWL=0.349, BAYES_00=-2.599, HTML_MESSAGE=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Q8WwMKP7OqrC for ; Mon, 8 Apr 2013 12:13:13 -0700 (PDT) Received: from blu0-omc2-s22.blu0.hotmail.com (blu0-omc2-s22.blu0.hotmail.com [65.55.111.97]) by ietfa.amsl.com (Postfix) with ESMTP id 03C5321F9401 for ; Mon, 8 Apr 2013 12:13:12 -0700 (PDT) Received: from BLU169-W67 ([65.55.111.73]) by blu0-omc2-s22.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Mon, 8 Apr 2013 12:13:12 -0700 X-EIP: [15Rzsr9lck+3tPRTXIuul7NbDIK2OSjokJcSG4wUBA8=] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: multipart/alternative; boundary="_880a0a3f-cbf7-42fc-a6c8-664567939e5a_" From: Bernard Aboba To: Ted Hardie , "rtcweb@ietf.org" Date: Mon, 8 Apr 2013 12:13:12 -0700 Importance: Normal In-Reply-To: References: MIME-Version: 1.0 X-OriginalArrivalTime: 08 Apr 2013 19:13:12.0482 (UTC) FILETIME=[1D2CA020:01CE348D] Subject: Re: [rtcweb] Minutes for the Data Channel Presentations X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 Apr 2013 19:13:14 -0000 --_880a0a3f-cbf7-42fc-a6c8-664567939e5a_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ted -- I have gone over the minutes from the DataChannel sessions. It appears to = me that there are some issues with the minutes. Comments below on Randell'= s session. More to follow.=20 Presenter: Randell Jesep Slides:http://www.ietf.org/proceedings/86/slides/s= lides=AD86=ADrtcweb=AD5.pdf [BA] What specific drafts did this presentation relate to? I think it's qu= ite important to be specific=2C since comments during the session need a co= ntext. For example=2C did this presentation relate to the individual submi= ssion draft-jesup-rtcweb-data-protocol=2C the RTCWEB WG work item draft-iet= f-rtcweb-data-channel=2C or the MMUSIC WG work item draft-ietf-mmusic-sctp-= sdp? Since the presentation refers to SDP=2C at least the MMUSIC WG work = item seems relevant=2C no?=20 Richard Ejzak asked what is our bottom line? He sees this as going backward= sfrom interim. SDP negotiation removed [BA] Randell's proposal did not propose to remove all SDP negotiation. It = leaves negotiation of DTLS port and SCTP associations in SDP=2C but removes= SDP negotiation of streams. It seems important to be specific about what= was being discussed (e.g. modifications to draft-ietf-mmusic-sctp-sdp)=2C = so as to be able to understand what commenters were referring to.=20 Peter Thatcher commented that he thinks the presenter's proposal is great [BA] It is hard for me to understand what Peter meant without some addition= al context (e.g. was the comment only about the proposal to remove stream n= egotiation from SDP=2C or potentially a comment about draft-jesup-rtcweb-da= ta-protocol?) Randell added that the solution DO have a protocol parameter with this stil= l. [BA] What "solution" is being referred to here? The proposal in draft-jesu= p-rtcweb-data-protocol? A post to the mailing list? The participants we= re discussing how streams are set up=2C but it wasn't clear to me what was = being referred to.=20 Harald Alverstrand stated that he Agree with this. Glad got data channel ne= gotiation out of the document.=20 [BA] Specifically I believe Harald was referring to Randell's proposal to r= emove stream negotiation from draft-ietf-mmusic-sctp-sdp. Since stream neg= otiation is still in the document=2C "got" is not correct. =20 Salvatore Loreto stated that he like this proposal =AD should negotiate onl= y one way and should not use SDP. [BA] Again=2C I believe that this meant "should not use SDP for stream nego= tiation". =20 Jerome Marcon added that the draft does not really contain all this materia= l now=2C therefore text needs to be added. Randell agreed that there need t= o be added [BA] What does "the draft" refer to here? draft-ietf-mmusic-sctp-sdp? Tha= t makes the most sense to me since stream negotiation was still in there.=20 Chairs asked how many had read the draft=2C which was couple of dozen. Chai= rsurge people to read and report new issues to the mailing list. Request th= atRandell takes the open issues in separate emails to the list. [BA] Again what is "the draft" referring to here? Since draft-ietf-mmusic-= sctp-sdp didn't contain the material that was presented=2C was this what th= e chairs were referring to? Or did they mean draft-ietf-rtcweb-data-channe= l? I have read all the above docs=2C and have gone over the MeetEcho sessi= on=2C and still don't understand what was being referred to here=2C (or eve= n why it was relevant).=20 Salvatore commented that one open issue is if we are going to definepriorit= ization between channels. Randell responded that prioritization istricky as= it interacts with congestion control [BA] Prioritization is discussed in draft-jesup-rtcweb-data-protocol=2C but= not in the other documents=2C so was Salvatore referring to that document = here? =20 Randell responded that he has no issue of adding this to the list of open i= ssues. [BA] Open issues on what document? Date: Fri=2C 5 Apr 2013 13:28:45 -0700 From: ted.ietf@gmail.com To: rtcweb@ietf.org Subject: [rtcweb] Uploaded unified minutes for both days of IETF 86 meeting= s Howdy=2C We have now uploaded unified minutes with the corrections we received on th= e list=3B thanks to all who reviewed. If you have not yet done so=2C there= is still time to update=2C so please take a look. thanks=2C =0A= Ted Hardie=2C for the chairs. =0A= _______________________________________________=0A= rtcweb mailing list=0A= rtcweb@ietf.org=0A= https://www.ietf.org/mailman/listinfo/rtcweb = --_880a0a3f-cbf7-42fc-a6c8-664567939e5a_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Ted --

I have= gone over the minutes from the DataChannel sessions.  =3BIt appears to= me that there are some issues with the minutes.  =3BComments below on = Randell's session.  =3BMore to follow. =3B

Presenter: Randell Jesep Slides:
http://www.ietf.org/procee= dings/86/slides/slides=AD86=ADrtcweb=AD5.pdf

[BA] What specific drafts did this presentation relate to?  =3BI think= it's quite important to be specific=2C since comments during the session n= eed a context.  =3BFor example=2C did this presentation relate to the i= ndividual submission draft-jesup-rtcweb-data-protocol=2C the RTCWEB WG work= item draft-ietf-rtcweb-data-channel=2C or the MMUSIC WG work item draft-ie= tf-mmusic-sctp-sdp?  =3BSince the presentation refers to SDP=2C  = =3Bat least the MMUSIC WG work item seems relevant=2C no? =3B

Richard Ejzak asked what is our bottom line? He sees t= his as going backwards
from interim. SDP negotiation removed

[BA] Randell's proposal did not propose to remov= e all SDP negotiation.  =3BIt leaves negotiation of DTLS port and SCTP = associations in SDP=2C but removes SDP negotiation of streams.  =3B It = seems important to be specific about what was being discussed (e.g. modific= ations to draft-ietf-mmusic-sctp-sdp)=2C so as to be able to understand wha= t commenters were referring to. =3B

Peter That= cher commented that he thinks the presenter's proposal is great
<= br>
[BA] It is hard for me to understand what Peter meant without= some additional context (e.g. was the comment only about the proposal to r= emove stream negotiation from SDP=2C or potentially a comment about draft-j= esup-rtcweb-data-protocol?)

Randell added tha= t the solution DO have a protocol parameter with this =3Bstill.

[BA] Wh= at "solution" is being referred to here?  =3BThe proposal in draft-jesu= p-rtcweb-data-protocol?  =3B A post to the mailing list?  =3B The p= articipants were discussing how streams are set up=2C but it wasn't clear t= o me what was being referred to. =3B

=
Harald Alverstrand stated that he Agree with this. Glad got data chann= el =3Bnegotiation out of the documen= t. =3B

<= /div>
[BA] Specifically I believe Ha= rald was referring to Randell's proposal to remove stream negotiation from = draft-ietf-mmusic-sctp-sdp.  =3BSince stream negotiation is still in th= e document=2C "got" is not correct.  =3B

Salvatore Loreto stated that he like this proposal =AD should ne= gotiate only one =3Bway and should n= ot use SDP.

=
[BA] Again=2C I believe that = this meant "should not use SDP for stream negotiation".  =3B

Jerome Marcon added that the draft does not re= ally contain all this material =3Bno= w=2C therefore text needs to be added. Randell agreed that there need to be=  =3Badded

[BA] What does "the draft" refer to here?  =3Bdraft-ietf= -mmusic-sctp-sdp?  =3BThat makes the most sense to me since stream nego= tiation was still in there. =3B

= Chairs asked how many had read the draft=2C which was couple of dozen. Chai= rs
urge people to read and report new issues to the mailing list.= Request that
Randell takes the open issues in separate emails to= the list.

[BA] Again what is "the draft" referrin= g to here?  =3BSince draft-ietf-mmusic-sctp-sdp didn't contain the mate= rial that was presented=2C was this what the chairs were referring to? &nbs= p=3BOr did they mean draft-ietf-rtcweb-data-channel?  =3BI have read al= l the above docs=2C and have gone over the MeetEcho session=2C and still do= n't understand what was being referred to here=2C (or even why it was relev= ant). =3B

Salvatore commented that one op= en issue is if we are going to define
prioritization between chan= nels. Randell responded that prioritization is
tricky as it inter= acts with congestion control

[BA] Prioritiza= tion is discussed in draft-jesup-rtcweb-data-protocol=2C but not in the oth= er documents=2C so was Salvatore referring to that document here?  =3B<= /div>

Randell responded that he has no issue = =3Bof adding this to the list of open is= sues.

=
[BA] Open issues on what docu= ment?

=






Date: Fri=2C 5 Apr 2013 13:28:45 -0700
From: ted.iet= f@gmail.com
To: rtcweb@ietf.org
Subject: [rtcweb] Uploaded unified mi= nutes for both days of IETF 86 meetings

Howdy=2C

We have now = uploaded unified minutes with the corrections we received on the list=3B th= anks to all who reviewed. =3B If you have not yet done so=2C there is s= till time to update=2C so please take a look.

thanks=2C
=0A=
Ted Hardie=2C for the chairs.
=0A=
_______________________________________________=0A= rtcweb mailing list=0A= rtcweb@ietf.org=0A= https://www.ietf.org/mailman/listinfo/rtcweb
<= /body> = --_880a0a3f-cbf7-42fc-a6c8-664567939e5a_-- From randell-ietf@jesup.org Mon Apr 8 13:31:56 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A343721F9130 for ; Mon, 8 Apr 2013 13:31:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.143 X-Spam-Level: X-Spam-Status: No, score=-2.143 tagged_above=-999 required=5 tests=[AWL=0.456, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id i2gXAMo9VGst for ; Mon, 8 Apr 2013 13:31:55 -0700 (PDT) Received: from r2-chicago.webserversystems.com (r2-chicago.webserversystems.com [173.236.101.58]) by ietfa.amsl.com (Postfix) with ESMTP id 5DCC421F8EF1 for ; Mon, 8 Apr 2013 13:31:55 -0700 (PDT) Received: from pool-98-111-140-34.phlapa.fios.verizon.net ([98.111.140.34]:2403 helo=[192.168.1.12]) by r2-chicago.webserversystems.com with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.80) (envelope-from ) id 1UPIjK-000E9n-2R for rtcweb@ietf.org; Mon, 08 Apr 2013 15:31:54 -0500 Message-ID: <516328C9.7070506@jesup.org> Date: Mon, 08 Apr 2013 16:30:01 -0400 From: Randell Jesup User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130307 Thunderbird/17.0.4 MIME-Version: 1.0 To: rtcweb@ietf.org References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - r2-chicago.webserversystems.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - jesup.org Subject: Re: [rtcweb] Minutes for the Data Channel Presentations X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 Apr 2013 20:31:56 -0000 On 4/8/2013 3:13 PM, Bernard Aboba wrote: > Ted -- > > I have gone over the minutes from the DataChannel sessions. It > appears to me that there are some issues with the minutes. Comments > below on Randell's session. More to follow. > > Presenter: Randell Jesep Slides: > http://www.ietf.org/proceedings/86/slides/slides­86­rtcweb­5.pdf Sigh. I was waiting for that misspelling to occur.... :-( > > [BA] What specific drafts did this presentation relate to? I think > it's quite important to be specific, since comments during the session > need a context. For example, did this presentation relate to the > individual submission draft-jesup-rtcweb-data-protocol, the RTCWEB WG > work item draft-ietf-rtcweb-data-channel, or the MMUSIC WG work item > draft-ietf-mmusic-sctp-sdp? Since the presentation refers to SDP, at > least the MMUSIC WG work item seems relevant, no? draft-jesup-rtcweb-data-protocol (as stated right above what you copied, on the other side of a page break). It *impacts* draft-ietf-mmusic-sctp-sdp. > Richard Ejzak asked what is our bottom line? He sees this as going > backwards > from interim. SDP negotiation removed > > [BA] Randell's proposal did not propose to remove all SDP negotiation. > It leaves negotiation of DTLS port and SCTP associations in SDP, but > removes SDP negotiation of streams. It seems important to be specific > about what was being discussed (e.g. modifications to > draft-ietf-mmusic-sctp-sdp), so as to be able to understand what > commenters were referring to. Correct. "Initial SDP negotiation of individual DataChannels removed" would be more accurate. > > Peter Thatcher commented that he thinks the presenter's proposal is great > > [BA] It is hard for me to understand what Peter meant without some > additional context (e.g. was the comment only about the proposal to > remove stream negotiation from SDP, or potentially a comment about > draft-jesup-rtcweb-data-protocol?) The implied context in the room was that what was presented and in the draft (data-protocol) was great. > > Randell added that the solution DO have a protocol parameter with this > still. > > [BA] What "solution" is being referred to here? The proposal in > draft-jesup-rtcweb-data-protocol? A post to the mailing list? The > participants were discussing how streams are set up, but it wasn't > clear to me what was being referred to. I think this quote is confused. (We're talking about the whole RTT thing here mostly). I *think* I said we *do* have a protocol parameter on channels, and so that can be used to handle channels created after the initial offer/answer. I also stated earlier that I'd responded to a very similar comment on the list with a more detailed response (the previous night, so people might not have read it yet). > > Harald Alverstrand stated that he Agree with this. Glad got data > channel negotiation out of the document. > > [BA] Specifically I believe Harald was referring to Randell's proposal > to remove stream negotiation from draft-ietf-mmusic-sctp-sdp. Since > stream negotiation is still in the document, "got" is not correct. Yes, given this wasn't a joint session and we didn't update the other draft in time for the cutoff, technically that's correct, but in practice the SDP is the way to do negotiation for DataChannels as defined in rtcweb, so regardless if the change had been formally applied yet they're linked. > > Salvatore Loreto stated that he like this proposal ­ should negotiate > only one way and should not use SDP. > > [BA] Again, I believe that this meant "should not use SDP for stream > negotiation". Correct. (And Salvatore is the other author on the mmusic draft.) > > Jerome Marcon added that the draft does not really contain all this > material now, therefore text needs to be added. Randell agreed that > there need to be added > > [BA] What does "the draft" refer to here? draft-ietf-mmusic-sctp-sdp? > That makes the most sense to me since stream negotiation was still in > there. Unclear, but it may well refer to the mmusic stuff, and might also refer to the even/odd details. > > Chairs asked how many had read the draft, which was couple of dozen. > Chairs > urge people to read and report new issues to the mailing list. Request > that > Randell takes the open issues in separate emails to the list. > > [BA] Again what is "the draft" referring to here? Since > draft-ietf-mmusic-sctp-sdp didn't contain the material that was > presented, was this what the chairs were referring to? Or did they > mean draft-ietf-rtcweb-data-channel? I have read all the above docs, > and have gone over the MeetEcho session, and still don't understand > what was being referred to here, (or even why it was relevant). draft-jesup-data-protocol (again, stated above the page-break in the notes, and on the title page of my slides) > > Salvatore commented that one open issue is if we are going to define > prioritization between channels. Randell responded that prioritization is > tricky as it interacts with congestion control > > [BA] Prioritization is discussed in draft-jesup-rtcweb-data-protocol, > but not in the other documents, so was Salvatore referring to that > document here? > > Randell responded that he has no issue of adding this to the list of > open issues. > > [BA] Open issues on what document? > Ditto the comments above. draft-jesup-data-protocol -- Randell Jesup randell-ietf@jesup.org From magnus.westerlund@ericsson.com Tue Apr 9 00:12:02 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3E31021F9047 for ; Tue, 9 Apr 2013 00:12:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.134 X-Spam-Level: X-Spam-Status: No, score=-106.134 tagged_above=-999 required=5 tests=[AWL=0.115, BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JHrAzDqAaDFM for ; Tue, 9 Apr 2013 00:12:00 -0700 (PDT) Received: from mailgw2.ericsson.se (mailgw2.ericsson.se [193.180.251.37]) by ietfa.amsl.com (Postfix) with ESMTP id 56F2B21F8FC6 for ; Tue, 9 Apr 2013 00:12:00 -0700 (PDT) X-AuditID: c1b4fb25-b7f366d000004d10-b3-5163bf3e1911 Received: from esessmw0184.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw2.ericsson.se (Symantec Mail Security) with SMTP id 76.7D.19728.E3FB3615; Tue, 9 Apr 2013 09:11:59 +0200 (CEST) Received: from [127.0.0.1] (153.88.115.8) by esessmw0184.eemea.ericsson.se (153.88.115.82) with Microsoft SMTP Server id 8.3.279.1; Tue, 9 Apr 2013 09:11:58 +0200 Message-ID: <5163BF3A.6080309@ericsson.com> Date: Tue, 9 Apr 2013 09:11:54 +0200 From: Magnus Westerlund User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130307 Thunderbird/17.0.4 MIME-Version: 1.0 To: Bernard Aboba References: In-Reply-To: X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprBLMWRmVeSWpSXmKPExsUyM+Jvra79/uRAg0P97Bb7l1xmtlj7r53d onGunQOzx85Zd9k9HvecYfNYsuQnUwBzFJdNSmpOZllqkb5dAlfGzA99bAVb9Sr2P1nK1sC4 RrWLkZNDQsBE4uSLS6wQtpjEhXvr2boYuTiEBE4xSnRtu8wO4SxjlLi15QgTSBWvgLbEi72/ GEFsFgEViaO3jjGD2GwCFhI3fzSygdiiAsESP1+dYYGoF5Q4OfMJkM3BISKgK/G3ywgkzCzg ITHt1lKwxcICDhLN/WfZQUqEBOokTvbXgYQ5Bawknk18wgxxm6TElhft7BCtehJTrrYwQtjy Es1bZ4PVCAFd1tDUwTqBUWgWksWzkLTMQtKygJF5FSN7bmJmTnq50SZGYOge3PJbdQfjnXMi hxilOViUxHnDXS8ECAmkJ5akZqemFqQWxReV5qQWH2Jk4uCUamDUaBDflCdk9XjJt7+b+EqW N7ezaFdNzXxcZLgodHODWckSkeyYPUy+6kJXDz3aOXPv8mkSCTPP+K8uuOVttaLx0LemA0EP QtnnhK69uvt6U0bcWo2z3be2Jwl3qP5zOjbPXJ2neeq7yYxZQgemK/DNaT7qWfP2b1Axe9yf GwKad6MMC52WvLirxFKckWioxVxUnAgAn+08bCsCAAA= Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] Minutes for the Data Channel Presentations X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 09 Apr 2013 07:12:02 -0000 Bernard, We definitely should try to improve the minutes with the context. But, I do have to make an observation. We are commonly this poor at being exact in referencing and being specific when discussing at the mic. Just something for everyone to think about. That would help and reduce the risk that a note-taker or chair cleaning up minutes to wrongly attribute statements to the wrong context. It would be good if the persons who actually made statements around this could help clarify what was intended to be referenced. Thanks Magnus On 2013-04-08 21:13, Bernard Aboba wrote: > Ted -- > > I have gone over the minutes from the DataChannel sessions. It appears > to me that there are some issues with the minutes. Comments below on > Randell's session. More to follow. > > Presenter: Randell Jesep Slides: > http://www.ietf.org/proceedings/86/slides/slides­86­rtcweb­5.pdf > > [BA] What specific drafts did this presentation relate to? I think it's > quite important to be specific, since comments during the session need a > context. For example, did this presentation relate to the individual > submission draft-jesup-rtcweb-data-protocol, the RTCWEB WG work item > draft-ietf-rtcweb-data-channel, or the MMUSIC WG work item > draft-ietf-mmusic-sctp-sdp? Since the presentation refers to SDP, at > least the MMUSIC WG work item seems relevant, no? > > Richard Ejzak asked what is our bottom line? He sees this as going backwards > from interim. SDP negotiation removed > > [BA] Randell's proposal did not propose to remove all SDP negotiation. > It leaves negotiation of DTLS port and SCTP associations in SDP, but > removes SDP negotiation of streams. It seems important to be specific > about what was being discussed (e.g. modifications to > draft-ietf-mmusic-sctp-sdp), so as to be able to understand what > commenters were referring to. > > Peter Thatcher commented that he thinks the presenter's proposal is great > > [BA] It is hard for me to understand what Peter meant without some > additional context (e.g. was the comment only about the proposal to > remove stream negotiation from SDP, or potentially a comment about > draft-jesup-rtcweb-data-protocol?) > > Randell added that the solution DO have a protocol parameter with > this still. > > [BA] What "solution" is being referred to here? The proposal in > draft-jesup-rtcweb-data-protocol? A post to the mailing list? The > participants were discussing how streams are set up, but it wasn't clear > to me what was being referred to. > > Harald Alverstrand stated that he Agree with this. Glad got data > channel negotiation out of the document. > > [BA] Specifically I believe Harald was referring to Randell's proposal > to remove stream negotiation from draft-ietf-mmusic-sctp-sdp. Since > stream negotiation is still in the document, "got" is not correct. > > Salvatore Loreto stated that he like this proposal ­ should negotiate > only one way and should not use SDP. > > [BA] Again, I believe that this meant "should not use SDP for stream > negotiation". > > Jerome Marcon added that the draft does not really contain all this > material now, therefore text needs to be added. Randell agreed that > there need to be added > > [BA] What does "the draft" refer to here? draft-ietf-mmusic-sctp-sdp? > That makes the most sense to me since stream negotiation was still in > there. > > Chairs asked how many had read the draft, which was couple of dozen. Chairs > urge people to read and report new issues to the mailing list. Request that > Randell takes the open issues in separate emails to the list. > > [BA] Again what is "the draft" referring to here? Since > draft-ietf-mmusic-sctp-sdp didn't contain the material that was > presented, was this what the chairs were referring to? Or did they mean > draft-ietf-rtcweb-data-channel? I have read all the above docs, and > have gone over the MeetEcho session, and still don't understand what was > being referred to here, (or even why it was relevant). > > Salvatore commented that one open issue is if we are going to define > prioritization between channels. Randell responded that prioritization is > tricky as it interacts with congestion control > > [BA] Prioritization is discussed in draft-jesup-rtcweb-data-protocol, > but not in the other documents, so was Salvatore referring to that > document here? > > Randell responded that he has no issue of adding this to the list of > open issues. > > [BA] Open issues on what document? > > > > > > > > ------------------------------------------------------------------------ > Date: Fri, 5 Apr 2013 13:28:45 -0700 > From: ted.ietf@gmail.com > To: rtcweb@ietf.org > Subject: [rtcweb] Uploaded unified minutes for both days of IETF 86 meetings > > Howdy, > > We have now uploaded unified minutes with the corrections we received on > the list; thanks to all who reviewed. If you have not yet done so, > there is still time to update, so please take a look. > > thanks, > > Ted Hardie, for the chairs. > > _______________________________________________ rtcweb mailing list > rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > -- Magnus Westerlund ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- From ted.ietf@gmail.com Tue Apr 9 15:20:34 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E686C21F99C5 for ; Tue, 9 Apr 2013 15:20:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.949 X-Spam-Level: X-Spam-Status: No, score=-1.949 tagged_above=-999 required=5 tests=[AWL=0.650, BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SNHTwD8+R5WB for ; Tue, 9 Apr 2013 15:20:33 -0700 (PDT) Received: from mail-ie0-x236.google.com (mail-ie0-x236.google.com [IPv6:2607:f8b0:4001:c03::236]) by ietfa.amsl.com (Postfix) with ESMTP id 67E7A21F99C4 for ; Tue, 9 Apr 2013 15:20:33 -0700 (PDT) Received: by mail-ie0-f182.google.com with SMTP id at1so9209017iec.27 for ; Tue, 09 Apr 2013 15:20:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:date:message-id:subject:from:to :content-type; bh=98ezUoHzfvhUTFiQP2S0oUszOnVQfD2G1eZxtlOXQMc=; b=vLYsfiNQSCJEyrVrGIH7ML/rMY6d8Bo7t/AgXMJuKiZPO91aVtyijWuK8ntcsQdGAj av4HBrZ3rP1ksEcPj6Qxswq31dq8+kP/haw3x0Tmhz9ZGc+33CtYgMdr/ML4dpQmBwa6 ntdiyRFP1KCe1/kOwt5PXE2kuI8Tq40DKzPxySuEvzBQIXa6NBhz7/yoBe3oLyRblkDq N7VBWfIQeo8QF1A6kZnnvEWQBNoS3/JLRsJ9vf7paaXs8C/8CeZ8k1FFODfX/0+Fw5un 8MXiJ/MzOlt2OJE9QpANCMpma/hyMzZHN7pxlJuSaMj1Qs79U+vplqFhXDkJsqopUC7j kHiA== MIME-Version: 1.0 X-Received: by 10.50.134.4 with SMTP id pg4mr11782978igb.96.1365546033102; Tue, 09 Apr 2013 15:20:33 -0700 (PDT) Received: by 10.43.135.202 with HTTP; Tue, 9 Apr 2013 15:20:32 -0700 (PDT) Date: Tue, 9 Apr 2013 15:20:32 -0700 Message-ID: From: Ted Hardie To: rtcweb@ietf.org Content-Type: multipart/alternative; boundary=047d7b3a98b83a4a8a04d9f4f649 Subject: [rtcweb] Mailing list DKIM signature issue X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 09 Apr 2013 22:20:34 -0000 --047d7b3a98b83a4a8a04d9f4f649 Content-Type: text/plain; charset=ISO-8859-1 Howdy, We had a brief period in which DKIM signatures were failing on this list. This was noticed when bounces related to this caused Mailman to unsubscribe a user, and it has been fixed. We've also restored that user. The total amount of time this was going on was short, but if you have a mail system that silently drops mail with a bad DKIM signature, rather than bouncing it, you may have missed some email to the list. Please check the archives (http://www.ietf.org/mail-archive/web/rtcweb/current/maillist.html) for the past week if you are concerned that your configuration may have been effected. regards, Ted Hardie --047d7b3a98b83a4a8a04d9f4f649 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Howdy,

We had a brief period in which DKIM signatures were failing o= n this list.=A0 This was noticed when bounces related to this caused Mailma= n to unsubscribe a user, and it has been fixed.=A0 We've also restored = that user.=A0

The total amount of time this was going on was short, but if you have a= mail system that silently drops mail with a bad DKIM signature, rather tha= n bouncing it, you may have missed some email to the list.=A0 Please check = the archives (http://www.ietf.org/mail-archive/web/rtcweb/current/mailli= st.html) for the past week if you are concerned that your configuration= may have been effected.=A0

regards,

Ted Hardie
--047d7b3a98b83a4a8a04d9f4f649-- From magnus.westerlund@ericsson.com Wed Apr 10 01:01:23 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D5F4321F8F71 for ; Wed, 10 Apr 2013 01:01:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.249 X-Spam-Level: X-Spam-Status: No, score=-106.249 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id y7jQGtHpjcSZ for ; Wed, 10 Apr 2013 01:01:18 -0700 (PDT) Received: from mailgw1.ericsson.se (mailgw1.ericsson.se [193.180.251.45]) by ietfa.amsl.com (Postfix) with ESMTP id 3B3D521F8F22 for ; Wed, 10 Apr 2013 01:01:18 -0700 (PDT) X-AuditID: c1b4fb2d-b7f316d0000028db-00-51651c4d2116 Received: from esessmw0191.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw1.ericsson.se (Symantec Mail Security) with SMTP id 36.89.10459.D4C15615; Wed, 10 Apr 2013 10:01:17 +0200 (CEST) Received: from [127.0.0.1] (153.88.115.8) by esessmw0191.eemea.ericsson.se (153.88.115.85) with Microsoft SMTP Server id 8.3.279.1; Wed, 10 Apr 2013 10:01:16 +0200 Message-ID: <51651C4B.6060600@ericsson.com> Date: Wed, 10 Apr 2013 10:01:15 +0200 From: Magnus Westerlund User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130307 Thunderbird/17.0.4 MIME-Version: 1.0 To: "rtcweb@ietf.org" References: <51651B91.1010303@ericsson.com> In-Reply-To: <51651B91.1010303@ericsson.com> X-Enigmail-Version: 1.5.1 X-Forwarded-Message-Id: <51651B91.1010303@ericsson.com> Content-Type: multipart/mixed; boundary="------------080006080501090603070600" X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrOKsWRmVeSWpSXmKPExsUyM+Jvra6vTGqgwenFUhZr/7WzOzB6LFny kymAMYrLJiU1J7MstUjfLoEr43/zOqaCPyoVjx+eZG1gPCjXxcjBISFgIrHwQn4XIyeQKSZx 4d56ti5GLg4hgVOMEj3vV7BDOMsZJZ5O3ssO0sAroC3xYA0nSAOLgKrEy3f/2UBsNgELiZs/ GsFsUYFgiZ+vzrCA2LwCghInZz4Bs0UE1CUuP7zADmILC4RLHL/aClYvBDSya1YvmM0poCPR M2EOG8RBkhJbXrSzQ9jmErNnHGEGsZkFAiR27F/JCtPb0NTBOoFRcBaSdbOQlEHYehJTrrYw QtjyEtvfzmGGsEsknsz8zgITb946GyjOBWT3MUrMetfMNAtsd4LEzV03WWaBw2IXo8SFfdtZ Z8EC5tjbXcwQq7UlLryeALYOFDLPFx8Fs2EhMwspZGaBQ8NM4uGE/WwQq4UkTs/5BlYvLBAk sXvJTPZZwMAWEvCUaJ8OVs4poCVx9N4pqIMgAYPNZxAfIAIGot5F4sTe9VC2tsT2V/ugbB2J bQf7WSBsG4m7Rw+xI4fiAkaZVYzsuYmZOenlhpsYgYnt4JbfujsYT50TOcQozcGiJM4b5noh QEggPbEkNTs1tSC1KL6oNCe1+BAjEwenVAOjYHv2nDJj1qnvzk3+Un/zStc9hakb9y+be+pQ 5JvsTHlWk4aZf/vVZ7cdmZ4/eYty11QF1afLWKUirGbs//lu6Y/1KhW/19U6bv/HH7rtHMdJ q/js89yZs76W7VrlnG/QO4/bYXk5050/+6XtNrF83rr+vfR9JgUjVZvix26/+LIXnXXZIvHL UImlOCPRUIu5qDgRAH0yi0s6AwAA Subject: [rtcweb] Fwd: Re: [AVTCORE] Reminder: Re: WG last call on draft-ietf-avtcore-6222bis-01 X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2013 08:01:24 -0000 --------------080006080501090603070600 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit RTCWEB WG, I have concluded in my role as AVTCORE WG co-chair that the RFC 6222 update has not received sufficient reviews to progress towards publication request. Here is your chance to contribute. All it takes is to review a short document and publicly state so on the AVTCORE mailing list (avt@ietf.org) and provide your opinion of its readiness for publication. Cheers Magnus Westerlund RTCWEB WG co-chair --------------080006080501090603070600 Content-Type: message/rfc822; name="Re: [AVTCORE] Reminder: Re: WG last call on draft-ietf-avtcore-6222bis-01.eml" Content-Transfer-Encoding: 8bit Content-Disposition: attachment; filename*0="Re: [AVTCORE] Reminder: Re: WG last call on draft-ietf-avtco"; filename*1="re-6222bis-01.eml" X-Mozilla-Keys: Received: from esessmw0256.eemea.ericsson.se (153.88.115.96) by ESESSHC014.ericsson.se (153.88.183.60) with Microsoft SMTP Server (TLS) id 14.2.318.4; Wed, 10 Apr 2013 09:58:12 +0200 Received: from [127.0.0.1] (153.88.115.8) by esessmw0256.eemea.ericsson.se (153.88.115.97) with Microsoft SMTP Server id 8.3.279.1; Wed, 10 Apr 2013 09:58:10 +0200 Message-ID: <51651B91.1010303@ericsson.com> Date: Wed, 10 Apr 2013 09:58:09 +0200 From: Magnus Westerlund User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130307 Thunderbird/17.0.4 To: Magnus Westerlund CC: Subject: Re: [AVTCORE] Reminder: Re: WG last call on draft-ietf-avtcore-6222bis-01 References: <513F7C5B.5060101@ericsson.com> <51541502.90406@ericsson.com> In-Reply-To: <51541502.90406@ericsson.com> X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 8bit Return-Path: magnus.westerlund@ericsson.com X-MS-Exchange-Organization-AuthSource: esessmw0256.eemea.ericsson.se X-MS-Exchange-Organization-AuthAs: Internal X-MS-Exchange-Organization-AuthMechanism: 10 X-MS-Exchange-Organization-AVStamp-Mailbox: MSFTFF;1;0;0 0 0 MIME-Version: 1.0 WG, This WG last call has concluded. I think the level of reviews on this document are very low. In the working group last call only Kevin Gross and I have stated that they have reviewed the latest version. Authors please address raised issues. I will not consider this a successful WG last call unless at least one additional person reviews it who are not an author. It is a very short document and it also don't require massive amounts of additional knowledge beyond basic RTP understanding to review. Regards Magnus Westerlund WG chair On 2013-03-28 11:01, Magnus Westerlund wrote: > WG, > > So far there has be no other reviews of this document than mine. > > Can someone please review this document? > > I hereby extended the WG last call with one week until the 7th of April. > > Cheers > > Magnus > > On 2013-03-12 20:04, Magnus Westerlund wrote: >> WG, >> >> This is to announce the start of a WG last call on: >> >> Guidelines for Choosing RTP Control Protocol (RTCP) Canonical Names >> (CNAMEs) to be published as a proposed standard. >> >> Document can be retrieved here: >> https://datatracker.ietf.org/doc/draft-ietf-avtcore-6222bis/ >> >> Please provide any feedback by the 31st of March. >> >> Regards >> >> Magnus Westerlund >> WG chair >> >> >> ---------------------------------------------------------------------- >> Multimedia Technologies, Ericsson Research EAB/TVM >> ---------------------------------------------------------------------- >> Ericsson AB | Phone +46 10 7148287 >> Färögatan 6 | Mobile +46 73 0949079 >> SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com >> ---------------------------------------------------------------------- >> >> _______________________________________________ >> Audio/Video Transport Core Maintenance >> avt@ietf.org >> https://www.ietf.org/mailman/listinfo/avt >> >> > > -- Magnus Westerlund ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- --------------080006080501090603070600-- From jerome.marcon@alcatel-lucent.com Wed Apr 10 06:35:10 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5D21421F97AF for ; Wed, 10 Apr 2013 06:35:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.599 X-Spam-Level: X-Spam-Status: No, score=-10.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BMcV5KNvS-Wd for ; Wed, 10 Apr 2013 06:35:09 -0700 (PDT) Received: from ihemail3.lucent.com (ihemail3.lucent.com [135.245.0.37]) by ietfa.amsl.com (Postfix) with ESMTP id 9F93321F97A8 for ; Wed, 10 Apr 2013 06:35:09 -0700 (PDT) Received: from us70uusmtp4.zam.alcatel-lucent.com (h135-5-2-66.lucent.com [135.5.2.66]) by ihemail3.lucent.com (8.13.8/IER-o) with ESMTP id r3ADZ5mq017434 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Wed, 10 Apr 2013 08:35:06 -0500 (CDT) Received: from US70UWXCHHUB01.zam.alcatel-lucent.com (us70uwxchhub01.zam.alcatel-lucent.com [135.5.2.48]) by us70uusmtp4.zam.alcatel-lucent.com (GMO) with ESMTP id r3ADYtoC031192 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Wed, 10 Apr 2013 09:35:03 -0400 Received: from FR711WXCHHUB02.zeu.alcatel-lucent.com (135.239.2.112) by US70UWXCHHUB01.zam.alcatel-lucent.com (135.5.2.48) with Microsoft SMTP Server (TLS) id 14.2.247.3; Wed, 10 Apr 2013 09:34:58 -0400 Received: from FR711WXCHMBA02.zeu.alcatel-lucent.com ([169.254.2.26]) by FR711WXCHHUB02.zeu.alcatel-lucent.com ([135.239.2.112]) with mapi id 14.02.0247.003; Wed, 10 Apr 2013 15:34:30 +0200 From: "MARCON, JEROME (JEROME)" To: Randell Jesup , "public-webrtc@w3.org" Thread-Topic: [rtcweb] DataChannels API and external negotiation Thread-Index: AQHOLoD2pU1/VCicR0uMGNwaeZcf8JjPgwYA Date: Wed, 10 Apr 2013 13:34:30 +0000 Message-ID: <39821B4C400EC14DAD4DB25330A9271A02B56F@FR711WXCHMBA02.zeu.alcatel-lucent.com> References: <5158F0FC.3070104@jesup.org> In-Reply-To: <5158F0FC.3070104@jesup.org> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [135.239.27.39] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.57 on 135.245.2.37 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] DataChannels API and external negotiation X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Apr 2013 13:35:10 -0000 Randell, What about data channel priority ? Jerome =20 > -----Message d'origine----- > De : rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org]=20 > De la part de Randell Jesup > Envoy=E9 : lundi 1 avril 2013 04:29 > =C0 : public-webrtc@w3.org > Cc : rtcweb@ietf.org > Objet : [rtcweb] DataChannels API and external negotiation >=20 > Here's a proposed API for DataChannels with external=20 > negotiation, per the recent Interim and IETF meeting (most of=20 > this was in my previous W3 email, but I've added info on when=20 > 'stream' is valid to read, and how even/odd roles are=20 > assigned for the IETF protocol). I'll note for the IETF folks=20 > that 'protocol' is in a JS dictionary object in this update,=20 > which avoids breaking any current experimental applications=20 > (and avoids them having any incentive to UA-sniff). Also, I=20 > think it works better in the dictionary. >=20 > channel =3D peerconnection.createDataChannel(label,=20 > dictionary_object); >=20 > /* If either maxRetransmitTime or maxRetransmitNum are set, it's > unreliable, else it's a reliable channel. If both are set it's an > error. outOfOrderAllowed can be used with any type of=20 > channel. The > equivalent of UDP is { outOfOrderAllowed: true,=20 > maxRetransmitNum: 0 }. > The TCP equivalent is {}. >=20 > preset is set to true if the channel is being externally=20 > negotiated, and > no wireline OpenRequest message should be sent. If=20 > preset is true, stream > can be optionally used to set a specific SCTP stream to=20 > use. If it's > not set but preset is true, then the application should=20 > read the 'stream' > attribute from the returned DataChannel after onopen and=20 > convey it to the > other end to pass in via the DataChannelInit dictionary. > */ >=20 > dictionary DataChannelInit { > boolean outOfOrderAllowed; > unsigned short maxRetransmitTime; > unsigned short maxRetransmitNum; > DOMString protocol; > boolean preset; > unsigned short stream; > }; >=20 > And I added to the DataChannel object webidl: >=20 > readonly attribute DOMString protocol; > /* the 'stream' attribute is not valid until after onopen=20 > has fired */ > readonly attribute unsigned short stream; >=20 >=20 > Even/odd roles for the underlying DataChannel protocol are=20 > tied to the DTLS roles on the DTLS connection. These are=20 > only available after the DTLS connection is established, and=20 > so we will set the even/odd roles when the initial=20 > association is established (which is when onconnection fires,=20 > and then any queued DataChannels would have onopen fire). >=20 > --=20 > Randell Jesup > randell-ietf@jesup.org >=20 > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > = From trac+rtcweb@trac.tools.ietf.org Thu Apr 11 16:04:09 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 22EC721F870F for ; Thu, 11 Apr 2013 16:04:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.599 X-Spam-Level: X-Spam-Status: No, score=-102.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OmU7KXkgMErI for ; Thu, 11 Apr 2013 16:04:08 -0700 (PDT) Received: from grenache.tools.ietf.org (grenache.tools.ietf.org [IPv6:2a01:3f0:1:2::30]) by ietfa.amsl.com (Postfix) with ESMTP id 8029F21F86FA for ; Thu, 11 Apr 2013 16:04:08 -0700 (PDT) Received: from localhost ([127.0.0.1]:33909 helo=grenache.tools.ietf.org ident=www-data) by grenache.tools.ietf.org with esmtp (Exim 4.80) (envelope-from ) id 1UQQXA-0006Qh-PW; Fri, 12 Apr 2013 01:04:00 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: "rtcweb issue tracker" X-Trac-Version: 0.12.3 Precedence: bulk Auto-Submitted: auto-generated X-Mailer: Trac 0.12.3, by Edgewall Software To: draft-jesup-rtcweb-data-protocol@tools.ietf.org, bernard_aboba@hotmail.com X-Trac-Project: rtcweb Date: Thu, 11 Apr 2013 23:04:00 -0000 X-URL: http://tools.ietf.org/rtcweb/ X-Trac-Ticket-URL: http://trac.tools.ietf.org/wg/rtcweb/trac/ticket/13 Message-ID: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> X-Trac-Ticket-ID: 13 X-SA-Exim-Connect-IP: 127.0.0.1 X-SA-Exim-Rcpt-To: draft-jesup-rtcweb-data-protocol@tools.ietf.org, bernard_aboba@hotmail.com, rtcweb@ietf.org X-SA-Exim-Mail-From: trac+rtcweb@trac.tools.ietf.org X-SA-Exim-Scanned: No (on grenache.tools.ietf.org); SAEximRunCond expanded to false Resent-To: randell-ietf@jesup.org, salvatore.loreto@ericsson.com, tuexen@fh-muenster.de Resent-Message-Id: <20130411230408.8029F21F86FA@ietfa.amsl.com> Resent-Date: Thu, 11 Apr 2013 16:04:08 -0700 (PDT) Resent-From: trac+rtcweb@trac.tools.ietf.org Cc: rtcweb@ietf.org Subject: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 11 Apr 2013 23:04:09 -0000 #13: Transport of DATA_CHANNEL_OPEN Comment on draft-jesup-rtcweb-data-protocol: All DATA_CHANNEL_OPEN messages MUST be sent reliably and in-order. [BA] The DATA_CHANNEL_OPEN message is not acknowledged at the application layer. Therefore all that reliability and in-order delivery provides (within the SCTP implementation) is the message was *received*, which doesn't tell you if the message was acted on or not. If you do support app-layer acknowledgement to address this, then you don't need transport reliability. -- -------------------------------------+------------------------------------- Reporter: | Owner: draft-jesup-rtcweb- bernard_aboba@hotmail.com | data-protocol@tools.ietf.org Type: defect | Status: new Priority: major | Milestone: milestone1 Component: data-channel | Version: 1.0 Severity: Candidate WG Document | Keywords: -------------------------------------+------------------------------------- Ticket URL: rtcweb From randell-ietf@jesup.org Mon Apr 15 22:41:03 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DBEEF21F92B2 for ; Mon, 15 Apr 2013 22:41:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.11 X-Spam-Level: X-Spam-Status: No, score=-1.11 tagged_above=-999 required=5 tests=[BAYES_05=-1.11] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Z1a-OzU8DuVx for ; Mon, 15 Apr 2013 22:41:02 -0700 (PDT) Received: from r2-chicago.webserversystems.com (r2-chicago.webserversystems.com [173.236.101.58]) by ietfa.amsl.com (Postfix) with ESMTP id A441621F849C for ; Mon, 15 Apr 2013 22:40:59 -0700 (PDT) Received: from pool-98-111-140-34.phlapa.fios.verizon.net ([98.111.140.34]:1506 helo=[192.168.1.12]) by r2-chicago.webserversystems.com with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.80) (envelope-from ) id 1URydW-0002lK-O9 for rtcweb@ietf.org; Tue, 16 Apr 2013 00:40:58 -0500 Message-ID: <516CE3EC.2050804@jesup.org> Date: Tue, 16 Apr 2013 01:38:52 -0400 From: Randell Jesup User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130307 Thunderbird/17.0.4 MIME-Version: 1.0 To: rtcweb@ietf.org References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> In-Reply-To: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - r2-chicago.webserversystems.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - jesup.org Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 Apr 2013 05:41:03 -0000 On 4/11/2013 7:04 PM, rtcweb issue tracker wrote: > #13: Transport of DATA_CHANNEL_OPEN > > Comment on draft-jesup-rtcweb-data-protocol: > > All DATA_CHANNEL_OPEN messages MUST be sent reliably and in-order. > > [BA] The DATA_CHANNEL_OPEN message is not acknowledged at the application > layer. Therefore all that reliability and in-order delivery provides > (within the SCTP implementation) is the message was *received*, which > doesn't tell you if the message was acted on or not. If you do support > app-layer acknowledgement to address this, then you don't need transport > reliability. > I disagree (though I suppose you don't *need* in-order, but it's a good idea). Reliable delivery means that you won't have a problem of "Open message gets lost, all data packets get queued at receiver but never delivered". Unless you have some meta-channel to tell the receiver that an open is on it's way, or add something to say " I have data but no Open", you want it to automatically retry to get the Open message through and unblock the channel. This isn't about the sending-side application knowing the Open was received (in fact, this draft gives no way for the JS app to know that). In theory because of the queue-on-data-before-open, you don't *need* in-order (and it only matters anyways if the channel is marked as in-order; otherwise it has no effect). But I also see no reason for it not to be in-order in that case. -- Randell Jesup randell-ietf@jesup.org From martin.thomson@gmail.com Tue Apr 16 09:11:56 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E258821F977B for ; Tue, 16 Apr 2013 09:11:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.599 X-Spam-Level: X-Spam-Status: No, score=-4.599 tagged_above=-999 required=5 tests=[AWL=-1.000, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id q9GQTCB2+qMe for ; Tue, 16 Apr 2013 09:11:55 -0700 (PDT) Received: from mail-wg0-f47.google.com (mail-wg0-f47.google.com [74.125.82.47]) by ietfa.amsl.com (Postfix) with ESMTP id F19EA21F976C for ; Tue, 16 Apr 2013 09:11:49 -0700 (PDT) Received: by mail-wg0-f47.google.com with SMTP id j13so662417wgh.26 for ; Tue, 16 Apr 2013 09:11:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=kpcBZCki6joszYPH9I8KQydmx2SqcEUwfFNve5ZVQ28=; b=JUZRbVlEyYm5Mwx16dhaJLgJMho1F2a2OjKvswu7MtbENzS+uRTXigqkNrfeeKYjSb FLBZpl4VGbq1JcFjSbWTflWZ0VjoPaxJZPEQv94cHAznJWFoWIq5WMLzULOuOj7cD7AG UEVyRlB0gB0r7vIWZBpyJ7h7wEmRAGk0d9B7M94D3H5zcLsapA57c0rigHVH0cXX2tJo HuVS24bjdte2FPhSTIe0EoytNknsBgeECxqh1y53LGBhsQv0G8eHHx1NxgTOBhhN6i4V z2dTMlLL/BMC7F+oNxrAAFgERFlugyysUC5lD4nO3CiPxL+8xPuIvxyaPjKdm/nvf5xt ce1w== MIME-Version: 1.0 X-Received: by 10.180.79.227 with SMTP id m3mr5027808wix.12.1366128707504; Tue, 16 Apr 2013 09:11:47 -0700 (PDT) Received: by 10.194.41.35 with HTTP; Tue, 16 Apr 2013 09:11:47 -0700 (PDT) In-Reply-To: <516CE3EC.2050804@jesup.org> References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> Date: Tue, 16 Apr 2013 09:11:47 -0700 Message-ID: From: Martin Thomson To: Randell Jesup Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 Apr 2013 16:11:56 -0000 On 15 April 2013 22:38, Randell Jesup wrote: > I disagree (though I suppose you don't *need* in-order, but it's a good > idea). In order delivery is not going to change anything. It's neither good nor bad, it's straight up useless. It's the ordering of the next packet that matters. If that is marked for out of order delivery, it can be delivered to the application (in this case, I'm talking about the browser) before the open message. Thus, the browser can (and will) receive messages prior to getting an open. The only safe assumption it can make at this point is that the channel is configured for out of order delivery. Better to be silent about in order delivery and leave that for buffering. I do agree with you about reliability. If you care about this message enough to have it sent, then you probably want retransmission. From vkg@bell-labs.com Tue Apr 16 11:57:26 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5594D21F96BC for ; Tue, 16 Apr 2013 11:57:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.599 X-Spam-Level: X-Spam-Status: No, score=-110.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OXKtApdtW7Vr for ; Tue, 16 Apr 2013 11:57:22 -0700 (PDT) Received: from ihemail3.lucent.com (ihemail3.lucent.com [135.245.0.37]) by ietfa.amsl.com (Postfix) with ESMTP id BE3F621F9675 for ; Tue, 16 Apr 2013 11:57:21 -0700 (PDT) Received: from usnavsmail4.ndc.alcatel-lucent.com (usnavsmail4.ndc.alcatel-lucent.com [135.3.39.12]) by ihemail3.lucent.com (8.13.8/IER-o) with ESMTP id r3GIvHrX018572 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL) for ; Tue, 16 Apr 2013 13:57:20 -0500 (CDT) Received: from umail.lucent.com (umail-ce2.ndc.lucent.com [135.3.40.63]) by usnavsmail4.ndc.alcatel-lucent.com (8.14.3/8.14.3/GMO) with ESMTP id r3GIvHGQ019072 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Tue, 16 Apr 2013 13:57:17 -0500 Received: from shoonya.ih.lucent.com (shoonya.ih.lucent.com [135.185.237.229]) by umail.lucent.com (8.13.8/TPES) with ESMTP id r3GIvHaP025016 for ; Tue, 16 Apr 2013 13:57:17 -0500 (CDT) Message-ID: <516D9F0D.60202@bell-labs.com> Date: Tue, 16 Apr 2013 13:57:17 -0500 From: "Vijay K. Gurbani" Organization: Bell Laboratories, Alcatel-Lucent User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130311 Thunderbird/17.0.4 MIME-Version: 1.0 To: rtcweb@ietf.org Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.57 on 135.245.2.37 X-Scanned-By: MIMEDefang 2.64 on 135.3.39.12 Subject: [rtcweb] IEEE Communications Special Issue on Web-based Communications X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 Apr 2013 18:57:26 -0000 Folks: Salvatore Loreto, Jörg Ott and I are the guest editors of a special issue in IEEE Communications on Web-based Communications. The papers in this special issue have been published in the current IEEE Communications 15(4), April 2013. The issue is available in print and through IEEE Explore. There were 5 papers published in the special issue. These papers cover the spectrum of rtcweb from an introductory tutorial to using rtcweb in an enterprise. Specifically, the following papers have been published: - "Guest editorial," Salvatore Loreto, Vijay K. Gurbani and Jörg Ott - "Real-time communications for the web," Cullen Jennings, Ted Hardie and Magnus Westerland. - "A case for SIP in JavaScript," Kundan Sing and Venkatesh Krishnaswamy - "Data channel considerations for RTCWeb," Martin Becke, Ervin P. Rathgeb, Sebastian Werner, Irene Rungeler, Michael Tuxen and Randall Stewart. - "On the seamless interaction between WebRTC browsers and SIP-based conferencing systems," Alessandro Amirante, Tobia Castaldi, Lorenzo Miniero and Simon Pietro Romano. - "Taking on WebRTC in an enterprise," Alan Johnston, John Yoakum and Kundan Sing. Happy reading. - vijay -- Vijay K. Gurbani, Bell Laboratories, Alcatel-Lucent 1960 Lucent Lane, Rm. 9C-533, Naperville, Illinois 60563 (USA) Email: vkg@{bell-labs.com,acm.org} / vijay.gurbani@alcatel-lucent.com Web: http://ect.bell-labs.com/who/vkg/ From pthatcher@google.com Wed Apr 17 08:35:15 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DB5D921E8047 for ; Wed, 17 Apr 2013 08:35:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.976 X-Spam-Level: X-Spam-Status: No, score=-102.976 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zfKpovYjvm+9 for ; Wed, 17 Apr 2013 08:35:14 -0700 (PDT) Received: from mail-pa0-f53.google.com (mail-pa0-f53.google.com [209.85.220.53]) by ietfa.amsl.com (Postfix) with ESMTP id 7F8D721F8E6E for ; Wed, 17 Apr 2013 08:35:14 -0700 (PDT) Received: by mail-pa0-f53.google.com with SMTP id bh4so981027pad.40 for ; Wed, 17 Apr 2013 08:35:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=Dl/rAg9notSv+c+vzI+QqWYQxHuOYvd3jG4ZOFlfH7w=; b=CpNyQrD+9rQt27KRaTi5uvmD70xBZdCWufcbMqr0vcEW+iBGmnXd1VN+B5rd4NtEHv hLIXSq1fb4dvDBHLhShjBm5egofEIIDR69vrGOzS6DLKLmNdBBe19urglmBccYwLNAyO tc+a5NOzkwN1ja/XepatLcMZ/KMI50zYIDeOqTcx/AxIWtSgN1lknUJiVMXdk6091kgE 9oldQ1qD8YcTOnor6mKwqxR/yj8VCkBu+H9+3IL6MPgxPVn1rBZuMV+hUHOJF7arPSmf 1mkmv4Lnl1i9ePLPEt3CEy8s6+BYbD9KTywQFZ02jMkpHs6sf2d0zDA+yOA86o+IBI8s ReBQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:x-gm-message-state; bh=Dl/rAg9notSv+c+vzI+QqWYQxHuOYvd3jG4ZOFlfH7w=; b=JetfYiwkzLQ+tsSuHi42RA0Qm/hDBVA/m+Hdmx5WZmIf+Q2gwe1txytcGCIhL6CN1q S7e/jiecMOEBMw8q6cvyWlkF+UQ2hg4z4DiNtuN2uohZZWPHqHPFeovGhNVdUv6E2Q4G TPQrguCn0MOiD2q7cQ3Z1ayEc+IpN3ObLs9/UKqJ1lvRowA1pmtKs0PJhTtTvBwgTfgP baLHcA/WebtYK06mSNK+YXGbt6S5ABfz6IlyRffYiNXDqDvcOVvW5yje7/UkPgvf0YMH h0c0Xz230Tn0ILqhR5fJg01UMlqzjVsrTIjHkWVsaSJ/W1F/a01oLRrE5y3+GDU+LGUR //kw== X-Received: by 10.68.198.69 with SMTP id ja5mr9818289pbc.183.1366212914141; Wed, 17 Apr 2013 08:35:14 -0700 (PDT) MIME-Version: 1.0 Received: by 10.66.228.138 with HTTP; Wed, 17 Apr 2013 08:34:34 -0700 (PDT) In-Reply-To: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> From: Peter Thatcher Date: Wed, 17 Apr 2013 08:34:34 -0700 Message-ID: To: Martin Thomson Content-Type: multipart/alternative; boundary=047d7bdc1b5a6f6d2404da903b39 X-Gm-Message-State: ALoCoQmKGio6ZpaEnNX0eQvpQ4LZ3sPtE9YKULXGqUCoVI7HJyI6QHKjj/z3kUGXKY2303s/FzIKeikxyscvGpi3vTkXXEGrOfMvb/N0SEYzsrilEyVw7OFRDOUeZDLDNiNQ1SwZXFDeHAQTnkvmq8R1FkLVNPAK1kZfxaZ4+XQn3qB/t+UW3orTcBPx/6awowD+hPaFclGe Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Apr 2013 15:35:16 -0000 --047d7bdc1b5a6f6d2404da903b39 Content-Type: text/plain; charset=UTF-8 A reminder: If the JS specifically sets the SID when creating a data channel, then it can receive data without getting an OPEN message. I agree with Martin and Randell that the OPEN message must be sent reliably. I agree with Martin about in-order-ness and that the real question, if I can put it in my own words, is: What does the browser do when it receives data before an OPEN message for a SID that is not currently configured to receive data (ie JS has not called create channel for that SID and we've not received an OPEN for that SID)? No matter what we specify as the correct behavior, the browser still has to deal with this scenario, at the very least because of possibly erroneous or even malicious senders. It sounds like the answer appears to be "buffer until the OPEN". But there has to be a limit to how much we buffer. What if the remote peer accidentally or maliciously sends us 1GB of data and never sends an OPEN message? Then what does the browser do? I think at that point, we either have to drop data or fire an event up to JS letting it know. I would suggest that after some buffer limit N, the browser may fire .ondatachannel even if an OPEN message is not received, and then deliver buffered data through the channel given in that event. The only alternative seems to be to just drop the data without telling the JS. Are there are any other alternatives I haven't thought of? On Tue, Apr 16, 2013 at 9:11 AM, Martin Thomson wrote: > On 15 April 2013 22:38, Randell Jesup wrote: > > I disagree (though I suppose you don't *need* in-order, but it's a good > > idea). > > In order delivery is not going to change anything. It's neither good > nor bad, it's straight up useless. It's the ordering of the next > packet that matters. If that is marked for out of order delivery, it > can be delivered to the application (in this case, I'm talking about > the browser) before the open message. Thus, the browser can (and > will) receive messages prior to getting an open. > > The only safe assumption it can make at this point is that the channel > is configured for out of order delivery. Better to be silent about in > order delivery and leave that for buffering. > > I do agree with you about reliability. If you care about this message > enough to have it sent, then you probably want retransmission. > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > --047d7bdc1b5a6f6d2404da903b39 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
A reminder: =C2=A0If the JS specifically sets the SID when= creating a data channel, then it can receive data without getting an OPEN = message.=C2=A0

I agree with Martin and Randell tha= t the OPEN message must be sent reliably. =C2=A0

I agree with Martin about in-order-ness and that the re= al question, if I can put it in my own words, is: What does the browser do = when it receives data before an OPEN message for a SID that is not currentl= y configured to receive data (ie JS has not called create channel for that = SID and we've not received an OPEN for that SID)? =C2=A0

No matter what we specify as the correct behavior= , the browser still has to deal with this scenario, at the very least becau= se of possibly erroneous or even malicious senders.

It sounds like the answer appears to be "buffer until the OPEN&qu= ot;. =C2=A0But there has to be a limit to how much we buffer. =C2=A0What if= the remote peer accidentally or maliciously sends us 1GB of data and never= sends an OPEN message? =C2=A0Then what does the browser do?


I think at that point, we ei= ther have to drop data or fire an event up to JS letting it know. =C2=A0I w= ould suggest that after some buffer limit N, the browser may fire .ondatach= annel even if an OPEN message is not received, and then deliver buffered da= ta through the channel given in that event. =C2=A0The only alternative seem= s to be to just drop the data without telling the JS. =C2=A0Are there are a= ny other alternatives I haven't thought of?



<= div class=3D"gmail_extra">

On Tue, Apr 16= , 2013 at 9:11 AM, Martin Thomson <martin.thomson@gmail.com>= wrote:
On 15 April 2013 22:38, Ra= ndell Jesup <randell-ietf@jesu= p.org> wrote:
> I disagree (though I suppose you don't *need* in-order, but it'= ;s a good
> idea).

In order delivery is not going to change anything. =C2=A0It's nei= ther good
nor bad, it's straight up useless. =C2=A0It's the ordering of the n= ext
packet that matters. =C2=A0If that is marked for out of order delivery, it<= br> can be delivered to the application (in this case, I'm talking about the browser) before the open message. =C2=A0Thus, the browser can (and
will) receive messages prior to getting an open.

The only safe assumption it can make at this point is that the channel
is configured for out of order delivery. =C2=A0Better to be silent about in=
order delivery and leave that for buffering.

I do agree with you about reliability. =C2=A0If you care about this message=
enough to have it sent, then you probably want retransmission.
___________________________________= ____________
rtcweb mailing list
rtcweb@ietf.org
= https://www.ietf.org/mailman/listinfo/rtcweb

--047d7bdc1b5a6f6d2404da903b39-- From martin.thomson@gmail.com Wed Apr 17 11:46:41 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1504621E8055 for ; Wed, 17 Apr 2013 11:46:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.099 X-Spam-Level: X-Spam-Status: No, score=-4.099 tagged_above=-999 required=5 tests=[AWL=-0.500, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nDrpT-2ZFu1E for ; Wed, 17 Apr 2013 11:46:40 -0700 (PDT) Received: from mail-wg0-f47.google.com (mail-wg0-f47.google.com [74.125.82.47]) by ietfa.amsl.com (Postfix) with ESMTP id 58DC421E8047 for ; Wed, 17 Apr 2013 11:46:40 -0700 (PDT) Received: by mail-wg0-f47.google.com with SMTP id j13so1920264wgh.2 for ; Wed, 17 Apr 2013 11:46:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=lXV8IK/Ry3mTZZye1PvFBUCLxCFx6LK46T/a+CKQ1oM=; b=jMXPZABWOPgDS4CEOEt5Lz3awSmdBp3A1ckqJ57p6GBv8MaNvkLYSUa/ULqnYWW5Z7 xbRAMxiuixhZdXFmaxLao0PRIbtKgU+OYCd2pMfQ0gFLaCMxUhyt/SiZkUJ9xKmfLUY9 EQJrnUjQRaP3DPWe4eV4OTE2ScTE8WKW+gfJA/ODzLp7PRka05BaFfqnJIa65oGCVzGg yaOoMzaQW2pjWXa72rgzH+jymyWkQX9Cur8NR4b9GOMOuQZAHN29mCss08IiCqXiv2nv Je4TRRlZRX18k6Nj5KAkVIQJdtr7zCE7lN4KFdlRAxxlRx+pV2eiC1W8+RAL1pU1wny/ OnjQ== MIME-Version: 1.0 X-Received: by 10.180.79.6 with SMTP id f6mr28181331wix.26.1366224399535; Wed, 17 Apr 2013 11:46:39 -0700 (PDT) Received: by 10.194.28.195 with HTTP; Wed, 17 Apr 2013 11:46:39 -0700 (PDT) In-Reply-To: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> Date: Wed, 17 Apr 2013 11:46:39 -0700 Message-ID: From: Martin Thomson To: Peter Thatcher Content-Type: text/plain; charset=UTF-8 Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Apr 2013 18:46:41 -0000 On 17 April 2013 08:34, Peter Thatcher wrote: > What does the browser do when it receives data > before an OPEN message for a SID that is not currently configured to receive > data (ie JS has not called create channel for that SID and we've not > received an OPEN for that SID)? This is the key. Doubly so in light of: > A reminder: If the JS specifically sets the SID when creating a data > channel, then it can receive data without getting an OPEN message. The only reasonable thing to do is to buffer data with an upper bound on time, size and number of messages. When any of those limits are hit, then you need to do something. > I think at that point, we either have to drop data or fire an event up to JS > letting it know. I would suggest that after some buffer limit N, the > browser may fire .ondatachannel even if an OPEN message is not received, and > then deliver buffered data through the channel given in that event. The > only alternative seems to be to just drop the data without telling the JS. > Are there are any other alternatives I haven't thought of? I see the same two options: create a data channel with some default or inferred properties and fire events for the arrived messages, or complain loudly and chuck the messages away. I like the former, but we've violated expectations about consistency of channel properties. And this time its our (as a browser, that is) fault, we were asked to do something and we failed to do it. Packet loss happens and we didn't allow for it. From harald@alvestrand.no Wed Apr 17 14:58:20 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 864021F0D12 for ; Wed, 17 Apr 2013 14:58:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.599 X-Spam-Level: X-Spam-Status: No, score=-110.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rmzUlRqMZ0Cl for ; Wed, 17 Apr 2013 14:58:19 -0700 (PDT) Received: from eikenes.alvestrand.no (eikenes.alvestrand.no [158.38.152.233]) by ietfa.amsl.com (Postfix) with ESMTP id B72481F0D10 for ; Wed, 17 Apr 2013 14:58:19 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by eikenes.alvestrand.no (Postfix) with ESMTP id 8153C39E11D for ; Wed, 17 Apr 2013 23:58:18 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at eikenes.alvestrand.no Received: from eikenes.alvestrand.no ([127.0.0.1]) by localhost (eikenes.alvestrand.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nbYEfW10BR-z for ; Wed, 17 Apr 2013 23:58:17 +0200 (CEST) Received: from [IPv6:2001:470:de0a:27:8d75:2a83:3d29:f267] (unknown [IPv6:2001:470:de0a:27:8d75:2a83:3d29:f267]) by eikenes.alvestrand.no (Postfix) with ESMTPSA id A8FF139E116 for ; Wed, 17 Apr 2013 23:58:17 +0200 (CEST) Message-ID: <516F1AF9.2080301@alvestrand.no> Date: Wed, 17 Apr 2013 23:58:17 +0200 From: Harald Alvestrand User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Apr 2013 21:58:20 -0000 I think I (on behalf of applications I'll be writing) am in the camp of "If I asked to be told what the incoming data channel was (by not registering to handle data without an OPEN), and didn't get told what it was, I don't want the data". Perhaps provide a few buffers to handle packet reordering. But beyond that: Throw the data away. On 04/17/2013 08:46 PM, Martin Thomson wrote: > On 17 April 2013 08:34, Peter Thatcher wrote: >> What does the browser do when it receives data >> before an OPEN message for a SID that is not currently configured to receive >> data (ie JS has not called create channel for that SID and we've not >> received an OPEN for that SID)? > This is the key. Doubly so in light of: > >> A reminder: If the JS specifically sets the SID when creating a data >> channel, then it can receive data without getting an OPEN message. > The only reasonable thing to do is to buffer data with an upper bound > on time, size and number of messages. When any of those limits are > hit, then you need to do something. > >> I think at that point, we either have to drop data or fire an event up to JS >> letting it know. I would suggest that after some buffer limit N, the >> browser may fire .ondatachannel even if an OPEN message is not received, and >> then deliver buffered data through the channel given in that event. The >> only alternative seems to be to just drop the data without telling the JS. >> Are there are any other alternatives I haven't thought of? > I see the same two options: create a data channel with some default or > inferred properties and fire events for the arrived messages, or > complain loudly and chuck the messages away. > > I like the former, but we've violated expectations about consistency > of channel properties. And this time its our (as a browser, that is) > fault, we were asked to do something and we failed to do it. Packet > loss happens and we didn't allow for it. > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From martin.thomson@gmail.com Wed Apr 17 15:01:54 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 750661F0D12 for ; Wed, 17 Apr 2013 15:01:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.516 X-Spam-Level: X-Spam-Status: No, score=-5.516 tagged_above=-999 required=5 tests=[AWL=-1.917, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YtsVKobj3TfW for ; Wed, 17 Apr 2013 15:01:54 -0700 (PDT) Received: from mail-wg0-f49.google.com (mail-wg0-f49.google.com [74.125.82.49]) by ietfa.amsl.com (Postfix) with ESMTP id BE9AA1F0D10 for ; Wed, 17 Apr 2013 15:01:53 -0700 (PDT) Received: by mail-wg0-f49.google.com with SMTP id x12so2089785wgg.4 for ; Wed, 17 Apr 2013 15:01:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=7SxqklkswmEfpffOU6w+OW0UqqS4qKqFEXbiEyTCPKY=; b=RZdXCooltc/DZChzbu9HBUwxi3w9kIWtnmlOGNNPGLRsvY1ecudRodAAcC6ChmaKaP QGTp2o5A6pr+CCW5iX+zvIXKyK3Rw5xhwbgKCg4dpViH8vpc8scFg3WJzUV5Zxxe747s OGBp+aCScKl3gENbPFAjY5vf+tcW1TYmUB+R2+Mk5CKe/hFu53uDWFvXkE2ra86Rs79l zjpVal2svoZ5iR2Y7slzg/jRmOHia1bnu566B4g89EKlG9CCeSh3cD3OK86iECkNbMBH sB1v/0bG57+UM/YaPQvIAXuPm9aiRNEhCAKmtfZ8miZwgUnT6ErUmOo5jshsoGBpJbAK l5cQ== MIME-Version: 1.0 X-Received: by 10.180.83.199 with SMTP id s7mr11753031wiy.19.1366236113001; Wed, 17 Apr 2013 15:01:53 -0700 (PDT) Received: by 10.194.28.195 with HTTP; Wed, 17 Apr 2013 15:01:52 -0700 (PDT) In-Reply-To: <516F1AF9.2080301@alvestrand.no> References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> Date: Wed, 17 Apr 2013 15:01:52 -0700 Message-ID: From: Martin Thomson To: Harald Alvestrand Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Apr 2013 22:01:54 -0000 On 17 April 2013 14:58, Harald Alvestrand wrote: > I think I (on behalf of applications I'll be writing) am in the camp of "If > I asked to be told what the incoming data channel was (by not registering to > handle data without an OPEN), and didn't get told what it was, I don't want > the data". > > Perhaps provide a few buffers to handle packet reordering. > But beyond that: Throw the data away. What if the data is ordered? Couldn't the data you actually get depend on the data that got discarded? From jim.barnett@genesyslab.com Wed Apr 17 15:12:14 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 707801F0D19 for ; Wed, 17 Apr 2013 15:12:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.599 X-Spam-Level: X-Spam-Status: No, score=-3.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8wcDKW8IMcU8 for ; Wed, 17 Apr 2013 15:12:13 -0700 (PDT) Received: from service108-us.mimecast.com (service108-us.mimecast.com [205.139.110.64]) by ietfa.amsl.com (Postfix) with ESMTP id 70A331F0D17 for ; Wed, 17 Apr 2013 15:12:13 -0700 (PDT) Received: from webmail-us.genesyslab.com (168.75.250.4 [168.75.250.4]) (Using TLS) by service108-us.mimecast.com; Wed, 17 Apr 2013 18:12:07 -0400 Received: from GENSJZMBX02.msg.int.genesyslab.com ([fe80::64cd:bb44:81d2:5bca]) by GENSJZFE02.msg.int.genesyslab.com ([::1]) with mapi id 14.02.0318.004; Wed, 17 Apr 2013 15:12:04 -0700 From: Jim Barnett To: Harald Alvestrand , "rtcweb@ietf.org" Thread-Topic: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN Thread-Index: AQHOOmT/HBrruXMe0kWjWIPvwhRgR5jZer+AgAGH7wCAADWqgIAANYuA//+OF6A= Date: Wed, 17 Apr 2013 22:12:03 +0000 Message-ID: <57A15FAF9E58F841B2B1651FFE16D281038C61@GENSJZMBX02.msg.int.genesyslab.com> References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> In-Reply-To: <516F1AF9.2080301@alvestrand.no> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [108.7.220.231] MIME-Version: 1.0 X-MC-Unique: 113041718120702902 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Apr 2013 22:12:14 -0000 I agree. Here's another way to look at it: if you were in charge of secur= ity, would you allow installation of a browser that would quietly accept la= rge amounts of data without notifying anyone/anything? - Jim -----Original Message----- From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of= Harald Alvestrand Sent: Wednesday, April 17, 2013 5:58 PM To: rtcweb@ietf.org Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN I think I (on behalf of applications I'll be writing) am in the camp of "If= I asked to be told what the incoming data channel was (by not registering = to handle data without an OPEN), and didn't get told what it was, I don't w= ant the data". Perhaps provide a few buffers to handle packet reordering. But beyond that: Throw the data away. On 04/17/2013 08:46 PM, Martin Thomson wrote: > On 17 April 2013 08:34, Peter Thatcher wrote: >> What does the browser do when it receives data before an OPEN message=20 >> for a SID that is not currently configured to receive data (ie JS has=20 >> not called create channel for that SID and we've not received an OPEN=20 >> for that SID)? > This is the key. Doubly so in light of: > >> A reminder: If the JS specifically sets the SID when creating a data=20 >> channel, then it can receive data without getting an OPEN message. > The only reasonable thing to do is to buffer data with an upper bound=20 > on time, size and number of messages. When any of those limits are=20 > hit, then you need to do something. > >> I think at that point, we either have to drop data or fire an event=20 >> up to JS letting it know. I would suggest that after some buffer=20 >> limit N, the browser may fire .ondatachannel even if an OPEN message=20 >> is not received, and then deliver buffered data through the channel=20 >> given in that event. The only alternative seems to be to just drop the = data without telling the JS. >> Are there are any other alternatives I haven't thought of? > I see the same two options: create a data channel with some default or=20 > inferred properties and fire events for the arrived messages, or=20 > complain loudly and chuck the messages away. > > I like the former, but we've violated expectations about consistency=20 > of channel properties. And this time its our (as a browser, that is)=20 > fault, we were asked to do something and we failed to do it. Packet=20 > loss happens and we didn't allow for it. > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb _______________________________________________ rtcweb mailing list rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb From harald@alvestrand.no Thu Apr 18 00:01:49 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E618921F8EDA for ; Thu, 18 Apr 2013 00:01:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.599 X-Spam-Level: X-Spam-Status: No, score=-110.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3MApImQO+bm3 for ; Thu, 18 Apr 2013 00:01:49 -0700 (PDT) Received: from eikenes.alvestrand.no (eikenes.alvestrand.no [158.38.152.233]) by ietfa.amsl.com (Postfix) with ESMTP id 1F85921F8ED6 for ; Thu, 18 Apr 2013 00:01:49 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by eikenes.alvestrand.no (Postfix) with ESMTP id DBB7639E0F0; Thu, 18 Apr 2013 09:01:47 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at eikenes.alvestrand.no Received: from eikenes.alvestrand.no ([127.0.0.1]) by localhost (eikenes.alvestrand.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8ZWo-FcipGFH; Thu, 18 Apr 2013 09:01:47 +0200 (CEST) Received: from [IPv6:2001:470:de0a:27:8d75:2a83:3d29:f267] (unknown [IPv6:2001:470:de0a:27:8d75:2a83:3d29:f267]) by eikenes.alvestrand.no (Postfix) with ESMTPSA id 2159839E056; Thu, 18 Apr 2013 09:01:47 +0200 (CEST) Message-ID: <516F9A5A.6080402@alvestrand.no> Date: Thu, 18 Apr 2013 09:01:46 +0200 From: Harald Alvestrand User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 MIME-Version: 1.0 To: Martin Thomson References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2013 07:01:50 -0000 On 04/18/2013 12:01 AM, Martin Thomson wrote: > On 17 April 2013 14:58, Harald Alvestrand wrote: >> I think I (on behalf of applications I'll be writing) am in the camp of "If >> I asked to be told what the incoming data channel was (by not registering to >> handle data without an OPEN), and didn't get told what it was, I don't want >> the data". >> >> Perhaps provide a few buffers to handle packet reordering. >> But beyond that: Throw the data away. > What if the data is ordered? Couldn't the data you actually get > depend on the data that got discarded? If the data is required to be delivered in-order, it can't be delivered before the (in-order) OPEN packet I'm waiting for anyway, so the problem cannot occur. The problem can occur if data can be sent reliably, but without ordering. I'm willing to consider the option of saying that "throw the data away" means "report to the sender that this data channel closed with an error". It's even reasonably correct; what the sender expected to happen did not happen. (The receiver will never know that a data channel was attempted. It never opened.) From magnus.westerlund@ericsson.com Thu Apr 18 02:39:06 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8570E21F8B64 for ; Thu, 18 Apr 2013 02:39:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.069 X-Spam-Level: X-Spam-Status: No, score=-106.069 tagged_above=-999 required=5 tests=[AWL=0.180, BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lYmWY1tm9YBh for ; Thu, 18 Apr 2013 02:39:05 -0700 (PDT) Received: from mailgw2.ericsson.se (mailgw2.ericsson.se [193.180.251.37]) by ietfa.amsl.com (Postfix) with ESMTP id 8F7A121F8D71 for ; Thu, 18 Apr 2013 02:39:02 -0700 (PDT) X-AuditID: c1b4fb25-b7f366d000004d10-a5-516fbf3556dd Received: from esessmw0191.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw2.ericsson.se (Symantec Mail Security) with SMTP id 00.42.19728.53FBF615; Thu, 18 Apr 2013 11:39:01 +0200 (CEST) Received: from [127.0.0.1] (153.88.115.8) by esessmw0191.eemea.ericsson.se (153.88.115.85) with Microsoft SMTP Server id 8.3.279.1; Thu, 18 Apr 2013 11:39:01 +0200 Message-ID: <516FBF34.1070500@ericsson.com> Date: Thu, 18 Apr 2013 11:39:00 +0200 From: Magnus Westerlund User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: Randell Jesup References: <516328C9.7070506@jesup.org> In-Reply-To: <516328C9.7070506@jesup.org> X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprBLMWRmVeSWpSXmKPExsUyM+Jvra7p/vxAgwvT1Cz2L7nMbHF2W5bF 2n/t7A7MHo97zrB5LFnyk8njw/J1bAHMUVw2Kak5mWWpRfp2CVwZ33asZy2YyVax6u4mtgbG qaxdjBwcEgImElOPS3cxcgKZYhIX7q1n62Lk4hASOMUocWf3W2YIZzmjxOfNl9lBGngFtCX6 vluCNLAIqEos+buPHcRmE7CQuPmjkQ2kRFQgWGJrawxImFdAUOLkzCcsILaIgJbEmv5VrCA2 s4CdxLS+54wgtrCAg0Rz/1l2iFWzGSV+9a8AS3AKaEq0bl3PAnGcpMSWF+3sEM16ElOutjBC 2PISzVtnM4PYQkCnNTR1sE5gFJqFZPcsJC2zkLQsYGRexciem5iZk15utIkRGLoHt/xW3cF4 55zIIUZpDhYlcd5w1wsBQgLpiSWp2ampBalF8UWlOanFhxiZODilGhi7JkrMeHlx5gO1x+af 2Y6ZpApYFOa+CWY8sYL/yyYVvtSXB0JypBw659/dWV7O3qXSfNrIJWjzzhzun48auDu//H19 b9sU0+1/tRuUJIvmJmW6bXBqjA8T/t243fXsayuLekeW8qzGR+ue/Xy+mv/tg2Z/14knpuls +3nLQ7uKf/IMnxWnSrmVWIozEg21mIuKEwGCWS4gKwIAAA== Cc: rtcweb@ietf.org Subject: Re: [rtcweb] Minutes for the Data Channel Presentations X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2013 09:39:06 -0000 Hi, I have now updated the minutes trying to clarify the context and the corrections. Please check if you think this makes it clearer. If not I am happy to introduce additional clarifications, but please be explicit about what should be changed. http://www.ietf.org/proceedings/86/minutes/minutes-86-rtcweb cheers Magnus Westerlund ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- From eburger@standardstrack.com Thu Apr 18 07:33:11 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 738DF21F8F76 for ; Thu, 18 Apr 2013 07:33:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.599 X-Spam-Level: X-Spam-Status: No, score=-102.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3Zrb3PPu9UF4 for ; Thu, 18 Apr 2013 07:33:10 -0700 (PDT) Received: from eastrmfepo202.cox.net (eastrmfepo202.cox.net [68.230.241.217]) by ietfa.amsl.com (Postfix) with ESMTP id 8BD1921F8F2E for ; Thu, 18 Apr 2013 07:33:10 -0700 (PDT) Received: from eastrmimpo306 ([68.230.241.238]) by eastrmfepo202.cox.net (InterMail vM.8.01.05.09 201-2260-151-124-20120717) with ESMTP id <20130418143309.ZXGV31447.eastrmfepo202.cox.net@eastrmimpo306> for ; Thu, 18 Apr 2013 10:33:09 -0400 Received: from [192.168.13.119] ([216.185.0.190]) by eastrmimpo306 with cox id RSZ91l00R45xxPc01SZ9rF; Thu, 18 Apr 2013 10:33:09 -0400 X-CT-Class: Clean X-CT-Score: 0.00 X-CT-RefID: str=0001.0A020208.51700425.0185,ss=1,re=0.000,fgs=0 X-CT-Spam: 0 X-Authority-Analysis: v=2.0 cv=FMjFMZUs c=1 sm=1 a=Z2C6Iy+7mYQzYzIFtxLHpQ==:17 a=5FWaZN0OUJAA:10 a=jRG3T-manTQA:10 a=bfLuiRfvAAAA:8 a=erYugTjFFMQA:10 a=C3I3ZF1iAAAA:8 a=N54-gffFAAAA:8 a=gxZvrgisAAAA:8 a=48vgC7mUAAAA:8 a=178bI-bTU1YMyXreglAA:9 a=wPNLvfGTeEIA:10 a=V4Yg_9LqF70A:10 a=sK9FX98U6w4A:10 a=nAPXUAfsBmEA:10 a=3FZX-ydVlcEA:10 a=lZB815dzVvQA:10 a=6VQ_N-2SRU6yaqbRhQQA:9 a=Z2C6Iy+7mYQzYzIFtxLHpQ==:117 X-CM-Score: 0.00 Authentication-Results: cox.net; auth=pass (PLAIN) smtp.auth=ewburger@cox.net From: Eric Burger Content-Type: multipart/signed; boundary="Apple-Mail=_842A9A96-1F7F-4344-8A79-9067047AEF1A"; protocol="application/pgp-signature"; micalg=pgp-sha1 Message-Id: <9CD36F51-AFCC-41C7-A887-7567492310B1@standardstrack.com> Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) Date: Thu, 18 Apr 2013 10:33:09 -0400 References: <516D9F0D.60202@bell-labs.com> To: rtcweb@ietf.org In-Reply-To: <516D9F0D.60202@bell-labs.com> X-Mailer: Apple Mail (2.1503) Subject: Re: [rtcweb] IEEE Communications Special Issue on Web-based Communications X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2013 14:33:11 -0000 --Apple-Mail=_842A9A96-1F7F-4344-8A79-9067047AEF1A Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 Congratulations to those with accepted papers! On Apr 16, 2013, at 2:57 PM, Vijay K. Gurbani wrote: > Folks: Salvatore Loreto, J=F6rg Ott and I are the guest editors of a > special issue in IEEE Communications on Web-based Communications. >=20 > The papers in this special issue have been published in the current > IEEE Communications 15(4), April 2013. The issue is available in > print and through IEEE Explore. >=20 > There were 5 papers published in the special issue. These papers > cover the spectrum of rtcweb from an introductory tutorial to using > rtcweb in an enterprise. Specifically, the following papers have been > published: >=20 > - "Guest editorial," Salvatore Loreto, Vijay K. Gurbani and J=F6rg Ott > - "Real-time communications for the web," Cullen Jennings, Ted Hardie > and Magnus Westerland. > - "A case for SIP in JavaScript," Kundan Sing and Venkatesh = Krishnaswamy > - "Data channel considerations for RTCWeb," Martin Becke, Ervin P. > Rathgeb, Sebastian Werner, Irene Rungeler, Michael Tuxen and Randall > Stewart. > - "On the seamless interaction between WebRTC browsers and SIP-based > conferencing systems," Alessandro Amirante, Tobia Castaldi, Lorenzo > Miniero and Simon Pietro Romano. > - "Taking on WebRTC in an enterprise," Alan Johnston, John Yoakum and > Kundan Sing. >=20 > Happy reading. >=20 > - vijay > --=20 > Vijay K. Gurbani, Bell Laboratories, Alcatel-Lucent > 1960 Lucent Lane, Rm. 9C-533, Naperville, Illinois 60563 (USA) > Email: vkg@{bell-labs.com,acm.org} / vijay.gurbani@alcatel-lucent.com > Web: http://ect.bell-labs.com/who/vkg/ > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb --Apple-Mail=_842A9A96-1F7F-4344-8A79-9067047AEF1A Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.19 (Darwin) iQIcBAEBAgAGBQJRcAQlAAoJEDY/T2tCIPW32ukP/3eQvDbKBq1+rkQRo5+yxcE6 jZJWMATW7yNJSIf4c34LdxiXVDUmvSMEcayGVR8T3has6lsDokPg+ehCnf2Nb53B dALWgGzMXMbnTLxEp/JQUP9GrzU5F5jzTHEkO9dQ9onj712cJde9rWPdbdga042y TBagqZC16oMq67SKJ1iYIq7tyw7IgTnQq4SZGcof591FbWDVNHYCAGA+47r3ruzY a7tuJhbgQ+Rmk2gPDlpfy2rk2VGmu6DxatjljPRf1vj/dfjuTtFNgUwufzyOOELj 9IGKBGR3TC0d8wnrG5XlwN/OJ6ILtL8Qh9upKu+Azzy5CnPDt7o39T8YuUPMgefL 9o91JtCbW6lPC2GG1d0WZa/iSUDr5E4lE/U8TUG5KqSn5lby4VxfdgDnuCUZb4be t5VKUcDN++BoR9g8M/SjHWGivDjaGigPj0PriDCclk/jKqJafJ+X72IFiJ6LQHh0 Eh/nvgq4b1weXg0EA5rd77bdToVX4jgdEIHabykGie1J7OwPvdYCGC5lQ6Btg+uz 5cH/1AKxJSBRjZqZ9wWtbjm0aNzo6y8+Ie+METLwjkeKDnjaFmhg+UUbJJiwf1NB QzmUFUCIXABrNU5WkriM8ODxdQNakzWsvSMVBxXA8q6g6QyLU/sv4sJBJ0v6DdeY W9THLNOgjlXPW/Mz7szX =5N7Y -----END PGP SIGNATURE----- --Apple-Mail=_842A9A96-1F7F-4344-8A79-9067047AEF1A-- From martin.thomson@gmail.com Thu Apr 18 09:04:01 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C4AC721F8CF0 for ; Thu, 18 Apr 2013 09:04:01 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3RpU9daFn+L5 for ; Thu, 18 Apr 2013 09:04:01 -0700 (PDT) Received: from mail-la0-x236.google.com (mail-la0-x236.google.com [IPv6:2a00:1450:4010:c03::236]) by ietfa.amsl.com (Postfix) with ESMTP id 52B1921F8CE9 for ; Thu, 18 Apr 2013 09:04:00 -0700 (PDT) Received: by mail-la0-f54.google.com with SMTP id ec20so2724109lab.13 for ; Thu, 18 Apr 2013 09:03:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=F+l7LOLtSsyqowMFrvLtWxIxqFYqR2R4CVwEMYBxh+w=; b=eHl2qwAhSxd3JRtJSHKaXFYcjUUetlVfkylE9SH0b0ChUOJ90U8cck2FDMsF9YFx4T 8tjZfgf5/b7wphvoMpeXkGfVX/YSnJFcKB499RWUr8uu+UY66hqkdvX0xelL21FsV2MH 7qWj200EFM/v06g7yRmhDDMOCj7xvB5CD9qxki0H5qHzpK6kTwbhj9A6kxD5ji/tmNwn j4Nw11ZnMZ8DSWa5qpatjJaL5YRbD22+7rol/CjWEfqK8lNrqzqAvPWGz32tkHUnCYgJ ynvmvoUAJq7jaYnoGcQpHqw6b00onLMXjCGe5nZXgvpEmRaMBeKTKoIJ0xHzR0dJ4K8o 7Ahw== MIME-Version: 1.0 X-Received: by 10.112.140.1 with SMTP id rc1mr6228800lbb.43.1366301039308; Thu, 18 Apr 2013 09:03:59 -0700 (PDT) Received: by 10.112.6.67 with HTTP; Thu, 18 Apr 2013 09:03:59 -0700 (PDT) In-Reply-To: <516F9A5A.6080402@alvestrand.no> References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> <516F9A5A.6080402@alvestrand.no> Date: Thu, 18 Apr 2013 09:03:59 -0700 Message-ID: From: Martin Thomson To: Harald Alvestrand Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2013 16:04:01 -0000 On 18 April 2013 00:01, Harald Alvestrand wrote: >> What if the data is ordered? Couldn't the data you actually get >> depend on the data that got discarded? > > If the data is required to be delivered in-order, it can't be delivered > before the (in-order) OPEN packet I'm waiting for anyway, so the problem > cannot occur. Of course. > The problem can occur if data can be sent reliably, but without ordering. > > I'm willing to consider the option of saying that "throw the data away" > means "report to the sender that this data channel closed with an error". > It's even reasonably correct; what the sender expected to happen did not > happen. > > (The receiver will never know that a data channel was attempted. It never > opened.) In that case we'd have to reset the stream. Maybe our SCTP experts can advise on whether we could make that look like something other than a normal close. From harald@alvestrand.no Thu Apr 18 09:51:14 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2599421F8F06 for ; Thu, 18 Apr 2013 09:51:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.599 X-Spam-Level: X-Spam-Status: No, score=-110.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uTTIOiiCdOp8 for ; Thu, 18 Apr 2013 09:51:13 -0700 (PDT) Received: from eikenes.alvestrand.no (eikenes.alvestrand.no [158.38.152.233]) by ietfa.amsl.com (Postfix) with ESMTP id 802FF21F8EEC for ; Thu, 18 Apr 2013 09:51:13 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by eikenes.alvestrand.no (Postfix) with ESMTP id 4EC0F39E12F; Thu, 18 Apr 2013 18:51:12 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at eikenes.alvestrand.no Received: from eikenes.alvestrand.no ([127.0.0.1]) by localhost (eikenes.alvestrand.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id w5V2SIfwErHN; Thu, 18 Apr 2013 18:51:11 +0200 (CEST) Received: from [IPv6:2001:470:de0a:27:d42:6e2d:d108:3324] (unknown [IPv6:2001:470:de0a:27:d42:6e2d:d108:3324]) by eikenes.alvestrand.no (Postfix) with ESMTPSA id 8F0F639E0F0; Thu, 18 Apr 2013 18:51:11 +0200 (CEST) Message-ID: <5170247F.4090908@alvestrand.no> Date: Thu, 18 Apr 2013 18:51:11 +0200 From: Harald Alvestrand User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 MIME-Version: 1.0 To: Martin Thomson References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> <516F9A5A.6080402@alvestrand.no> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2013 16:51:14 -0000 On 04/18/2013 06:03 PM, Martin Thomson wrote: > On 18 April 2013 00:01, Harald Alvestrand wrote: >>> What if the data is ordered? Couldn't the data you actually get >>> depend on the data that got discarded? >> If the data is required to be delivered in-order, it can't be delivered >> before the (in-order) OPEN packet I'm waiting for anyway, so the problem >> cannot occur. > Of course. > >> The problem can occur if data can be sent reliably, but without ordering. >> >> I'm willing to consider the option of saying that "throw the data away" >> means "report to the sender that this data channel closed with an error". >> It's even reasonably correct; what the sender expected to happen did not >> happen. >> >> (The receiver will never know that a data channel was attempted. It never >> opened.) > In that case we'd have to reset the stream. Maybe our SCTP experts > can advise on whether we could make that look like something other > than a normal close. Yep, "reset the stream" is probably the right terminology. Sounds good to me. From martin.thomson@gmail.com Thu Apr 18 10:00:02 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4EE5D21F91BF for ; Thu, 18 Apr 2013 10:00:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.959 X-Spam-Level: X-Spam-Status: No, score=-6.959 tagged_above=-999 required=5 tests=[AWL=-3.360, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ZxlDkBDhLqz1 for ; Thu, 18 Apr 2013 10:00:01 -0700 (PDT) Received: from mail-lb0-f169.google.com (mail-lb0-f169.google.com [209.85.217.169]) by ietfa.amsl.com (Postfix) with ESMTP id 6F6F921F91B0 for ; Thu, 18 Apr 2013 10:00:01 -0700 (PDT) Received: by mail-lb0-f169.google.com with SMTP id p11so2934133lbi.0 for ; Thu, 18 Apr 2013 10:00:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=FK8aSyrtvenPxvMWRxkcc6aKBCntBmiu1zz110pXGKg=; b=C8LIHi81bCKrBPjTFLGM6AXBJZpo0RXuWEMUC5tNyn/Z7YhSk5xnVxs6F1UIV1S75r YMp5HCKa/vHq2BgvsSFTgh80h6q/NjK//uAefq/YukGGiDVN/JG4ZwsoB1z7jSy3JdXG H4BiR5TVYS4LHThI4QDA9yEezddD13QE7j1Zdy9bmLWZeWYFYk7hUuVdbwECWzLqh4hf QLO+TPbX1ODYeIRsUiQF71OUJjxT7clniPNf61m6ot+kKgvLIAZ22l2RNnpMhvgogHBb sZ1T8sR4NqWiTjrmFYVotg5laSKHy53XTuYll7jwSZBMMe+JULWVPLcgnmMA8DaFCerR jq8g== MIME-Version: 1.0 X-Received: by 10.112.76.39 with SMTP id h7mr6226266lbw.118.1366304400437; Thu, 18 Apr 2013 10:00:00 -0700 (PDT) Received: by 10.112.6.67 with HTTP; Thu, 18 Apr 2013 10:00:00 -0700 (PDT) In-Reply-To: <5170247F.4090908@alvestrand.no> References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> <516F9A5A.6080402@alvestrand.no> <5170247F.4090908@alvestrand.no> Date: Thu, 18 Apr 2013 10:00:00 -0700 Message-ID: From: Martin Thomson To: Harald Alvestrand Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2013 17:00:02 -0000 On 18 April 2013 09:51, Harald Alvestrand wrote: > Yep, "reset the stream" is probably the right terminology. Note that I was using a very specific terminology, not making shit up (I know, it's hard to tell sometimes). c.f. http://tools.ietf.org/html/rfc6525#section-4.2 Unfortunately, the "Incoming SSN Reset Request Parameter" doesn't include a way to signal that a particular reset is somehow different from a normal close. Therefore, unless you look at the SACK chunks - which is probably not possible above the SCTP layer - you can't tell the difference between: - I got your data and I'm done with this channel now - The OPEN message got lost for long enough that I ran out of buffering time or space, so this channel is borked; nothing was delivered This is where I think that Bernard was going with this. It's not that simple. I really don't want to get back to the point where we require application-level (read: browser-level) acknowledgement of OPEN messages to address this corner case. But we have to acknowledge that it's a problem and deal with it somehow. (HTTP/2.0 has an error message that it uses for this sort of case, maybe that could be a solution, assuming that the stream ID on the reverse path is available.) --Martin From Michael.Tuexen@lurchi.franken.de Thu Apr 18 11:23:14 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1701E21E803F for ; Thu, 18 Apr 2013 11:23:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id aXVS25W3ZfGk for ; Thu, 18 Apr 2013 11:23:13 -0700 (PDT) Received: from mail-n.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) by ietfa.amsl.com (Postfix) with ESMTP id C7DD021E803C for ; Thu, 18 Apr 2013 11:23:12 -0700 (PDT) Received: from [192.168.1.102] (p548186C1.dip0.t-ipconnect.de [84.129.134.193]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTP id 673451C0C069F; Thu, 18 Apr 2013 20:23:06 +0200 (CEST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=us-ascii From: Michael Tuexen In-Reply-To: <5170247F.4090908@alvestrand.no> Date: Thu, 18 Apr 2013 20:23:03 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <6BE3772E-AD2B-4F09-B4BC-2FEFB5787EEF@lurchi.franken.de> References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> <516F9A5A.6080402@alvestrand.no> <5170247F.4090908@alvestrand.no> To: Harald Alvestrand X-Mailer: Apple Mail (2.1283) Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2013 18:23:14 -0000 On Apr 18, 2013, at 6:51 PM, Harald Alvestrand wrote: > On 04/18/2013 06:03 PM, Martin Thomson wrote: >> On 18 April 2013 00:01, Harald Alvestrand = wrote: >>>> What if the data is ordered? Couldn't the data you actually get >>>> depend on the data that got discarded? >>> If the data is required to be delivered in-order, it can't be = delivered >>> before the (in-order) OPEN packet I'm waiting for anyway, so the = problem >>> cannot occur. >> Of course. >>=20 >>> The problem can occur if data can be sent reliably, but without = ordering. >>>=20 >>> I'm willing to consider the option of saying that "throw the data = away" >>> means "report to the sender that this data channel closed with an = error". >>> It's even reasonably correct; what the sender expected to happen did = not >>> happen. >>>=20 >>> (The receiver will never know that a data channel was attempted. It = never >>> opened.) >> In that case we'd have to reset the stream. Maybe our SCTP experts >> can advise on whether we could make that look like something other >> than a normal close. >=20 > Yep, "reset the stream" is probably the right terminology. I think just dropping messages without any indication that something = went wrong should be avoided. Closing the channel by resetting the streams is an option. Best regards Michael >=20 > Sounds good to me. >=20 > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb >=20 From Michael.Tuexen@lurchi.franken.de Thu Apr 18 11:30:47 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C29DB21F933B for ; Thu, 18 Apr 2013 11:30:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FNPip9A2dUqo for ; Thu, 18 Apr 2013 11:30:47 -0700 (PDT) Received: from mail-n.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) by ietfa.amsl.com (Postfix) with ESMTP id 1CCA721F9310 for ; Thu, 18 Apr 2013 11:30:47 -0700 (PDT) Received: from [192.168.1.102] (p548186C1.dip0.t-ipconnect.de [84.129.134.193]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTP id DC3911C0C069F; Thu, 18 Apr 2013 20:30:42 +0200 (CEST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=us-ascii From: Michael Tuexen In-Reply-To: Date: Thu, 18 Apr 2013 20:30:39 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de> References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> <516F9A5A.6080402@alvestrand.no> <5170247F.4090908@alvestrand.no> To: Martin Thomson X-Mailer: Apple Mail (2.1283) Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2013 18:30:47 -0000 On Apr 18, 2013, at 7:00 PM, Martin Thomson wrote: > On 18 April 2013 09:51, Harald Alvestrand = wrote: >> Yep, "reset the stream" is probably the right terminology. >=20 > Note that I was using a very specific terminology, not making shit up > (I know, it's hard to tell sometimes). c.f. > http://tools.ietf.org/html/rfc6525#section-4.2 >=20 > Unfortunately, the "Incoming SSN Reset Request Parameter" doesn't > include a way to signal that a particular reset is somehow different > from a normal close. Therefore, unless you look at the SACK chunks - > which is probably not possible above the SCTP layer - you can't tell > the difference between: > - I got your data and I'm done with this channel now > - The OPEN message got lost for long enough that I ran out of > buffering time or space, so this channel is borked; nothing was > delivered Absolutely correct! >=20 > This is where I think that Bernard was going with this. It's not that = simple. I think you are looking for some kind of "reliable opening a = datachannel". That was provided by the three way handshake. But the working group = decided that this kind of setup is not required... >=20 > I really don't want to get back to the point where we require > application-level (read: browser-level) acknowledgement of OPEN > messages to address this corner case. But we have to acknowledge that > it's a problem and deal with it somehow. (HTTP/2.0 has an error > message that it uses for this sort of case, maybe that could be a > solution, assuming that the stream ID on the reverse path is > available.) I think the OPEN can only be sent if both streams (incoming / outgoing) = are are available. I suggested an Error message already several times. Also for other things like reception of unsupported message types, unexpected = messages, message formatting issues, ... There are several error condition. I = think the alternative suggested was to reset the streams. However, for the = peer there is no way to figure out why the data channel was closed if something was = lost. Best regards Michael >=20 > --Martin > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb >=20 From Michael.Tuexen@lurchi.franken.de Thu Apr 18 11:44:29 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CCE3B21F8FF8 for ; Thu, 18 Apr 2013 11:44:29 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6BWMWkJFUFrW for ; Thu, 18 Apr 2013 11:44:29 -0700 (PDT) Received: from mail-n.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) by ietfa.amsl.com (Postfix) with ESMTP id E55F821F8FE3 for ; Thu, 18 Apr 2013 11:44:28 -0700 (PDT) Received: from [192.168.1.102] (p548186C1.dip0.t-ipconnect.de [84.129.134.193]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTP id A59451C0C069F; Thu, 18 Apr 2013 20:44:27 +0200 (CEST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=us-ascii From: Michael Tuexen In-Reply-To: Date: Thu, 18 Apr 2013 20:44:26 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> <516F9A5A.6080402@alvestrand.no> <5170247F.4090908@alvestrand.no> To: Martin Thomson X-Mailer: Apple Mail (2.1283) Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2013 18:44:29 -0000 On Apr 18, 2013, at 7:00 PM, Martin Thomson wrote: > On 18 April 2013 09:51, Harald Alvestrand = wrote: >> Yep, "reset the stream" is probably the right terminology. >=20 > Note that I was using a very specific terminology, not making shit up > (I know, it's hard to tell sometimes). c.f. > http://tools.ietf.org/html/rfc6525#section-4.2 >=20 > Unfortunately, the "Incoming SSN Reset Request Parameter" doesn't > include a way to signal that a particular reset is somehow different > from a normal close. Therefore, unless you look at the SACK chunks - > which is probably not possible above the SCTP layer - you can't tell > the difference between: > - I got your data and I'm done with this channel now > - The OPEN message got lost for long enough that I ran out of > buffering time or space, so this channel is borked; nothing was > delivered What brings up a question, since I'm not really familiar with the JS = API. If I have a data channel dc and call close() on the data channel. Are incoming messages still delivered, i.e. does onmessage still fire? Best regards Michael >=20 > This is where I think that Bernard was going with this. It's not that = simple. >=20 > I really don't want to get back to the point where we require > application-level (read: browser-level) acknowledgement of OPEN > messages to address this corner case. But we have to acknowledge that > it's a problem and deal with it somehow. (HTTP/2.0 has an error > message that it uses for this sort of case, maybe that could be a > solution, assuming that the stream ID on the reverse path is > available.) >=20 > --Martin > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb >=20 From martin.thomson@gmail.com Thu Apr 18 12:35:51 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2084E21F9370 for ; Thu, 18 Apr 2013 12:35:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.399 X-Spam-Level: X-Spam-Status: No, score=-6.399 tagged_above=-999 required=5 tests=[AWL=-2.800, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lEd9l40xvzai for ; Thu, 18 Apr 2013 12:35:50 -0700 (PDT) Received: from mail-lb0-f176.google.com (mail-lb0-f176.google.com [209.85.217.176]) by ietfa.amsl.com (Postfix) with ESMTP id 3E43621F936E for ; Thu, 18 Apr 2013 12:35:50 -0700 (PDT) Received: by mail-lb0-f176.google.com with SMTP id y8so3060730lbh.35 for ; Thu, 18 Apr 2013 12:35:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=QiHwERP37E0UP+Wk1HqPhZk60CzXr018c8pF0rwZMQA=; b=Wag+qAgJ5IJNYHP/ByqXAT05d5/l14ygHhn7sIzw6zczWON1b5p1KLeUMt5y7FJGkU e0JP/gmlRJxtXugSHW6465YxsI2a3t+dxOagQl/JMwDPrWtEphEsu3VegeyuP3GeUOuH 55wDEMZlo+rAfd0cVcNQhAZ78sNK49T7cj89R627geiKsEWl2/ZHwDAb6wixMhG4tJ7L ylU7HkZws+t0JoAcIg3ndzHfD5F2z07rMK1oIDs5UtLyjVkysZn1xMU8HWK/zrY6S3Pw FWH4RknYZkvu1AnrAEjAoRSU4JA7qjq5HvCRlEL9CEt0t4WIEOtStadQ8HxE3FxSTF+M Na/Q== MIME-Version: 1.0 X-Received: by 10.112.140.1 with SMTP id rc1mr6606636lbb.43.1366313749242; Thu, 18 Apr 2013 12:35:49 -0700 (PDT) Received: by 10.112.6.67 with HTTP; Thu, 18 Apr 2013 12:35:49 -0700 (PDT) In-Reply-To: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> <516F9A5A.6080402@alvestrand.no> <5170247F.4090908@alvestrand.no> Date: Thu, 18 Apr 2013 12:35:49 -0700 Message-ID: From: Martin Thomson To: Michael Tuexen Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2013 19:35:51 -0000 On 18 April 2013 11:44, Michael Tuexen wrote: > What brings up a question, since I'm not really familiar with the JS API. > > If I have a data channel dc and call close() on the data channel. Are > incoming messages still delivered, i.e. does onmessage still fire? My expectation is that any pending onmessage events would be suppressed. From martin.thomson@gmail.com Thu Apr 18 12:40:40 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E6EEE21F8F4E for ; Thu, 18 Apr 2013 12:40:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8KMQLXcwb7oJ for ; Thu, 18 Apr 2013 12:40:40 -0700 (PDT) Received: from mail-la0-x229.google.com (mail-la0-x229.google.com [IPv6:2a00:1450:4010:c03::229]) by ietfa.amsl.com (Postfix) with ESMTP id 274FC21E8095 for ; Thu, 18 Apr 2013 12:40:39 -0700 (PDT) Received: by mail-la0-f41.google.com with SMTP id er20so2927672lab.0 for ; Thu, 18 Apr 2013 12:40:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=tcnhBgUp+g94CJ5ltRvnHol+iRTwmA/SML6vvetSqoA=; b=FP0JoD7pGCIPO9lX7OVY4bLWvRmWW8nuRHoVQFsFxtsKU1seEQ64hpjQ6rWEVTLB8h B9JHVY4zYMo5cYG0AcYReuzWXdZpFVruE+bt2NbZctlJeiHLrdCyAPi83VaO3Awpy/Le MbK68im1qHJH3+3ekoKrjI8T3NukEYecTVVDuz3XDM4iHbmzzjv3vl/HygsKY6/7gKiy 3SVLq9mXOarEAQrCq/LN070O+EN+gJ79SXvFBlOY5w4Ljl7/p1iJJpeAUij3Rzjbgeur SVuyH56sRBHOIO4kQOeoMMHcksZsq9ID0CsQ1NE9h32P2z2XJwVCzSHuwnw/WJphg1ib FW+A== MIME-Version: 1.0 X-Received: by 10.112.157.227 with SMTP id wp3mr6546786lbb.128.1366314035899; Thu, 18 Apr 2013 12:40:35 -0700 (PDT) Received: by 10.112.6.67 with HTTP; Thu, 18 Apr 2013 12:40:35 -0700 (PDT) In-Reply-To: <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de> References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> <516F9A5A.6080402@alvestrand.no> <5170247F.4090908@alvestrand.no> <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de> Date: Thu, 18 Apr 2013 12:40:35 -0700 Message-ID: From: Martin Thomson To: Michael Tuexen Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2013 19:40:41 -0000 On 18 April 2013 11:30, Michael Tuexen wrote: > I think you are looking for some kind of "reliable opening a datachannel". > That was provided by the three way handshake. But the working group decided > that this kind of setup is not required... I certainly don't want this. If you recall, I advocated for no OPEN message at all. > I think the OPEN can only be sent if both streams (incoming / outgoing) are > are available. Yes, that would at least make it possible to indicate an error (except if the error is that an OPEN is received with no available return stream ;) > I suggested an Error message already several times. Also > for other things like reception of unsupported message types, unexpected messages, > message formatting issues, ... Those at least are application-layer error conditions. No need to add anything at the OPEN/ERROR layer for those. Applications can provide their own feedback path for those. > There are several error condition. I think > the alternative suggested was to reset the streams. However, for the peer there > is no way to figure out why the data channel was closed if something was lost. Exactly the point: not knowing would be bad because it would make data channels untrustworthy. Occasionally you would lose a channel and all the data you sent on it with no way, other than asking your peer, of knowing what got through. From magnus.westerlund@ericsson.com Fri Apr 19 06:38:45 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2933E21F95F1 for ; Fri, 19 Apr 2013 06:38:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.249 X-Spam-Level: X-Spam-Status: No, score=-106.249 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4m9sOzP-FiPd for ; Fri, 19 Apr 2013 06:38:44 -0700 (PDT) Received: from mailgw2.ericsson.se (mailgw2.ericsson.se [193.180.251.37]) by ietfa.amsl.com (Postfix) with ESMTP id 206CF21F95DF for ; Fri, 19 Apr 2013 06:38:43 -0700 (PDT) X-AuditID: c1b4fb25-b7f366d000004d10-a5-517148e2e2f7 Received: from esessmw0247.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw2.ericsson.se (Symantec Mail Security) with SMTP id 5E.0E.19728.2E841715; Fri, 19 Apr 2013 15:38:43 +0200 (CEST) Received: from [127.0.0.1] (153.88.115.8) by esessmw0247.eemea.ericsson.se (153.88.115.94) with Microsoft SMTP Server id 8.3.279.1; Fri, 19 Apr 2013 15:38:41 +0200 Message-ID: <517148E0.7080206@ericsson.com> Date: Fri, 19 Apr 2013 15:38:40 +0200 From: Magnus Westerlund User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: "rtcweb@ietf.org" X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrIJMWRmVeSWpSXmKPExsUyM+Jvre5jj8JAg929vBZr/7WzOzB6LFny kymAMYrLJiU1J7MstUjfLoEr484soYI9ohXnXyxna2A8ItjFyMkhIWAicePSNyYIW0ziwr31 bF2MXBxCAqcYJT4+vsQI4SxnlPjddxqsildAW+J03wo2EJtFQFVi2bdmdhCbTcBC4uaPRqA4 B4eoQLDE1tYYiHJBiZMzn7CA2CIC6hKXH14AKxcWsJdo+bueBWKxpMSWF+1gcWYBPYkpV1sY IWx5ieats5lBbCGgtQ1NHawTGPlnIRk7C0nLLCQtCxiZVzGy5yZm5qSXG21iBAbTwS2/VXcw 3jkncohRmoNFSZw33PVCgJBAemJJanZqakFqUXxRaU5q8SFGJg5OqQbGWbM7LWZsXZpkF9a2 yoenuVDpnp+MotiF82wLU4PZDxt67vglaXUtNnkFa+5j3bNLdkrkceZNjxDcsqLi9baXiznn PtYpd/3mo/nhWeta0Rd562YLWm291P75vu3aXkOZWTd+L+6rfHZmfUawiw73k4zDv0weXH/l l62odyAw6dM9sWm7bvumKrEUZyQaajEXFScCACAWxKX0AQAA Subject: [rtcweb] RTP Usage: Reducing dependency on codec specifications X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Apr 2013 13:38:45 -0000 WG, As Individual and Editor of the WG document: The latest version of the RTP usage for WebRTC says: 4.3. Choice of RTP Payload Formats Implementations MUST follow the WebRTC Audio Codec and Processing Requirements [I-D.ietf-rtcweb-audio] and SHOULD follow the updated recommendations for audio codecs in the RTP/AVP Profile [I-D.ietf-avtcore-avp-codecs]. Support for other audio codecs is OPTIONAL. (tbd: the mandatory to implement video codec is not yet decided) >From this I would like to make two observations. The first that the audio codecs draft should actually include the RTP payload format specification for the codecs it specifies to support. I strongly think this is the right place because if one later changes the codec requirements then one only need to update the audio specification rather than also RTP usage. Secondly, that it might be best remove strong normative dependencies on the codec specifications in the RTP usage. We can clearly include informative references saying that the codec specification for WebRTC will specify the RTP payload formats to use. This also reduced cross referencing and dependencies between these specifications. Thus allowing us to move forward with the RTP usage independent on any continued video or audio codec discussions that may occur in the WG. I propose that we change the first paragraph and remove the open issue (tbd) listed after so the text instead reads: 4.3. Choice of RTP Payload Formats The RTP payload formats to support depends on the media codecs that an implementation supports for media transport in WebRTC. These includes any codec mandated by other WebRTC codec specifications, such as the audio codecs specified in WebRTC Audio Codec and Processing Requirements [I-D.ietf-rtcweb-audio], or recommended by the RTP profile in use, see Update to Recommended Codecs for the RTP Profile for Audio and Video Conferences with Minimal Control (RTP/AVP) [I-D.ietf-avtcore-avp-codecs]. Support of any additional codecs and their RTP payload formats is OPTIONAL. Thoughts about this? I intended to suggest some text for the audio codec draft to improve its specification of the RTP payload formats related to the codecs. Cheers Magnus Westerlund ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- From randell-ietf@jesup.org Fri Apr 19 09:41:55 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A739A21F9593 for ; Fri, 19 Apr 2013 09:41:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.001 X-Spam-Level: X-Spam-Status: No, score=0.001 tagged_above=-999 required=5 tests=[BAYES_50=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2AtoTr7A-5uM for ; Fri, 19 Apr 2013 09:41:55 -0700 (PDT) Received: from r2-chicago.webserversystems.com (r2-chicago.webserversystems.com [173.236.101.58]) by ietfa.amsl.com (Postfix) with ESMTP id 2CA1D21F9590 for ; Fri, 19 Apr 2013 09:41:55 -0700 (PDT) Received: from pool-98-111-140-34.phlapa.fios.verizon.net ([98.111.140.34]:2416 helo=[192.168.1.12]) by r2-chicago.webserversystems.com with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.80) (envelope-from ) id 1UTENm-000F9S-A4 for rtcweb@ietf.org; Fri, 19 Apr 2013 11:41:54 -0500 Message-ID: <5171734E.3050300@jesup.org> Date: Fri, 19 Apr 2013 12:39:42 -0400 From: Randell Jesup User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> <516F9A5A.6080402@alvestrand.no> <5170247F.4090908@alvestrand.no> <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - r2-chicago.webserversystems.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - jesup.org Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Apr 2013 16:41:55 -0000 Since we send the Open reliably, barring active attempts to game the system with a non-browser, the Open *will* eventually get through unless you have 100% (or virtually so) packet loss (and in that case, nothing useful, including an error response, is getting through anyways). So I honestly feel it's ok to just buffer all incoming packets while waiting for the Open. No one is going to get a gigabyte of data in without an Open... A non-browser could fake up a session and start sending data without ever sending an Open... but flushing the data doesn't actually help you against that sort of active DOS (they can just start again, they can spread it across thousands of channels, etc, etc), and there are FAR better DOS methods - all this would do is burn some CPU and some memory. -- Randell Jesup randell-ietf@jesup.org From tterriberry@mozilla.com Fri Apr 19 10:09:58 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A2F4521F89C3 for ; Fri, 19 Apr 2013 10:09:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.677 X-Spam-Level: X-Spam-Status: No, score=-2.677 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_MISMATCH_ORG=0.611, HOST_MISMATCH_COM=0.311, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pH7oRN6I2ns7 for ; Fri, 19 Apr 2013 10:09:58 -0700 (PDT) Received: from smtp.mozilla.org (mx2.corp.phx1.mozilla.com [63.245.216.70]) by ietfa.amsl.com (Postfix) with ESMTP id 7FF4421F87D1 for ; Fri, 19 Apr 2013 10:09:56 -0700 (PDT) Received: from [10.250.6.54] (unknown [63.245.220.240]) (Authenticated sender: tterriberry@mozilla.com) by mx2.mail.corp.phx1.mozilla.com (Postfix) with ESMTPSA id 09A57F2251 for ; Fri, 19 Apr 2013 10:09:55 -0700 (PDT) Message-ID: <51717A63.9070909@mozilla.com> Date: Fri, 19 Apr 2013 10:09:55 -0700 From: "Timothy B. Terriberry" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:19.0) Gecko/20100101 SeaMonkey/2.16.2 MIME-Version: 1.0 To: "rtcweb@ietf.org" References: <517148E0.7080206@ericsson.com> In-Reply-To: <517148E0.7080206@ericsson.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [rtcweb] RTP Usage: Reducing dependency on codec specifications X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Apr 2013 17:09:58 -0000 Magnus Westerlund wrote: > implementation supports for media transport in WebRTC. These includes s/includes/include/ > any codec mandated by other WebRTC codec specifications, such as the > audio codecs specified in WebRTC Audio Codec and Processing Requirements > [I-D.ietf-rtcweb-audio], or recommended by the RTP profile in use, see "see" should probably begin a new sentence. > Update to Recommended Codecs for the RTP Profile for Audio and Video > Conferences with Minimal Control (RTP/AVP) > [I-D.ietf-avtcore-avp-codecs]. Support of any additional codecs and > their RTP payload formats is OPTIONAL. > > > Thoughts about this? This sounds reasonable to me. From martin.thomson@gmail.com Fri Apr 19 11:11:14 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D69F421F95FF for ; Fri, 19 Apr 2013 11:11:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JecGtPnE4FbX for ; Fri, 19 Apr 2013 11:11:14 -0700 (PDT) Received: from mail-wi0-x235.google.com (mail-wi0-x235.google.com [IPv6:2a00:1450:400c:c05::235]) by ietfa.amsl.com (Postfix) with ESMTP id 2027521F8F00 for ; Fri, 19 Apr 2013 11:11:13 -0700 (PDT) Received: by mail-wi0-f181.google.com with SMTP id c10so1214035wiw.14 for ; Fri, 19 Apr 2013 11:11:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=BlpUTrgBIq8bWVK4H0Fzj0SvCszjTiAO3RX1enRpIAw=; b=ymgFLor5T+HPPgveLKY/Rna97KSeuQ+0qS9gW59VRPBtyj61P6DxFqJG6Lrt4KpTY1 QDiQlin5Y4twstYYcY7JlzHnIOst9qr801ZQS6+ML291fzREoLZK9gG6IPdMeAs4oGsL vQu7AYV0wLPN8TAYmPnvvEohogBJkvQa33j82GG/dTKpteB0BOKc449eKp//A0do+FSw WcptThbIK/xgEM9YSw6I+aVdmEowPhIj4ehRSibfPZS+85k6VHrIkXN3a5PnMNs3Uyng 63XtpblQcsVQVgc3LGdfLO3lQOo8QwUsWDOF3I97xcQ9eoJ53waHdW5GBEmUG1HdAIke GxDQ== MIME-Version: 1.0 X-Received: by 10.180.94.133 with SMTP id dc5mr5682325wib.1.1366395069725; Fri, 19 Apr 2013 11:11:09 -0700 (PDT) Received: by 10.194.33.102 with HTTP; Fri, 19 Apr 2013 11:11:04 -0700 (PDT) In-Reply-To: <5171734E.3050300@jesup.org> References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> <516F9A5A.6080402@alvestrand.no> <5170247F.4090908@alvestrand.no> <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de> <5171734E.3050300@jesup.org> Date: Fri, 19 Apr 2013 11:11:04 -0700 Message-ID: From: Martin Thomson To: Randell Jesup Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Apr 2013 18:11:14 -0000 On 19 April 2013 09:39, Randell Jesup wrote: > the Open *will* eventually get through unless you have > 100% (or virtually so) packet loss I'm going to pretend you didn't say that. If you want to talk odds, that's fine, but I think that you'll find that this sort of error is far more likely than you realize. We're talking the probability of incoming data exceeding a given threshold prior to an open being delivered. After all, unless you have 0% loss, the *possible* maximum amount of data is infinite. Though large numbers might be of relatively low probability on an individual basis, operating at scale you are going to encounter surprising spikes. > I honestly feel it's ok to just buffer all incoming packets while waiting for the Open. That's not a warm fuzzy that I share. > No one is going to get a gigabyte of data in without an Open... A > non-browser could fake up a session and start sending data without ever > sending an Open... but flushing the data doesn't actually help you against > that sort of active DOS (they can just start again, they can spread it > across thousands of channels, etc, etc), and there are FAR better DOS > methods - all this would do is burn some CPU and some memory. I think that would be a mistake. This isn't about denial of service, it's about genuine usage cases that encounter errors. The receiver can't use the receive window to apply back pressure if they are reading from the stream to look for the open message, so you end up with an unbounded amount of data. The amount of data will scale with bandwidth delay product. A long, fat pipe might burn more CPU and memory than you are willing to tolerate. Then it comes down to what experience you want to provide to the unfortunates who encounter this problem. From pthatcher@google.com Fri Apr 19 12:13:37 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BC84D21F8F45 for ; Fri, 19 Apr 2013 12:13:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.976 X-Spam-Level: X-Spam-Status: No, score=-102.976 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id liRLPHVbNHu0 for ; Fri, 19 Apr 2013 12:13:36 -0700 (PDT) Received: from mail-pa0-f48.google.com (mail-pa0-f48.google.com [209.85.220.48]) by ietfa.amsl.com (Postfix) with ESMTP id 1EF6121F8F28 for ; Fri, 19 Apr 2013 12:13:36 -0700 (PDT) Received: by mail-pa0-f48.google.com with SMTP id lj1so2420374pab.35 for ; Fri, 19 Apr 2013 12:13:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=3hynWy1HW7vSxBbkwQVsQP7ksKhkSIjMnNZtjLnd1vQ=; b=IKlgysmo9FXAkXz437kJGtpcKtBEizVYSD5vrr7wltZpyB8pGS/8JQdqrO7l8TR/es UZEhE87MuznxnZ7woyhc2O+uUs/JVs3xz4C2+YsRiUeMdCAJ6H5CBWCPqd85sUO0Qu6s 4s32kIeMDT795PRuRoDcfOl5vbfkQtHUoQATF0c6ICQz5QvXgwAHXGKoPxbkXuYy72kD nTxm/C4OcCe9y/wy7t5S5eS/3KouMagMj2uge2glW/AknpLOqNLcK38HIGeYpr9CTLg+ 5HavYP3YJ2VXkGr0tKX0A8SedGoN24gLRFdtBh+AtvBZejZg3dUT0PCeUv4Dll09CDWI CW+w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:x-gm-message-state; bh=3hynWy1HW7vSxBbkwQVsQP7ksKhkSIjMnNZtjLnd1vQ=; b=KRXMMerQZm89OoJtN7H+/g+myKnpxyIYFaNiBLA3aa6WZe69yZiWO1wv7d8ec6TMUv rxnRIMMVT1T3jQptl7YPYBZ06gl32detaKfc+XJYDK0zY+eFpxoFJ9K+mPusboV/o8i7 NlFK3IYb3O0IfrNEbmoc5EvQPIxfUcrVEI7WgYxePjLAT2kkcHnogRPgAz4ULSLW/kU4 z+PMKhXGsBGLg0gP7K5Sk7McNZA1ycVtasynNohrxF3QPO/7mZXhQJcgMmr6GsOVfN7E MOoXvDFMqJBAENxxTK0BRu9+SLBhXnoVDCqS6vkZtdZdMClO2LKJ+owxQaIiMFZRObqo QQpw== X-Received: by 10.66.250.134 with SMTP id zc6mr822977pac.121.1366398812080; Fri, 19 Apr 2013 12:13:32 -0700 (PDT) MIME-Version: 1.0 Received: by 10.66.228.138 with HTTP; Fri, 19 Apr 2013 12:12:50 -0700 (PDT) In-Reply-To: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> <516F9A5A.6080402@alvestrand.no> <5170247F.4090908@alvestrand.no> <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de> <5171734E.3050300@jesup.org> From: Peter Thatcher Date: Fri, 19 Apr 2013 12:12:50 -0700 Message-ID: To: Martin Thomson Content-Type: multipart/alternative; boundary=047d7b15b295d0e7a604dabb8334 X-Gm-Message-State: ALoCoQnM6F5AG3W3j+n0KQQ+PF7KiFwT6UpAYrqEqYwI2brlZMxv4SoI8Nc7FITmZSSFyA9t06TGWJBmwkzplHqY2fj7oUsGD0ir8tzqNzRa2i3uKHtuYIIy/jq8bOg4T2eQf8QeJ7UXc9ckSBjydQzQFvwNV6jkMIvoW+B7d4u30i4Bly/kfkfh3NKchsnMC6TvP7sTLIv8 Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Apr 2013 19:13:37 -0000 --047d7b15b295d0e7a604dabb8334 Content-Type: text/plain; charset=UTF-8 I like all the discussion, but I feel like we need to get back to the question and what options we have. The question: "what does the browser do with unexpected data (before an open of an unregistered sid)?" 1. Buffer forever without limits: Randell thinks it's OK to buffer forever without limits. Martin disagrees. I disagree (I agree with Martin). 2. Buffer with limits, and then: a. Hand an error to JS saying "got some data for a data channel, but an OPEN never came" WITHOUT providing the data to JS: Harald likes this. I'm OK with this. b. Hand an error to JS saying "got some data for a data channel, but an OPEN never came" WITH providing the data: I like this better, since I don't see a reason not to give JS the data. c. Fire .ondatachannel: This is what I was was originally thinking, but I understand the downsides mentioned, and would be happy with (b) instead. Right now, it seems like 2a or 2b is our best options, mixed with resetting the stream. In other words, if I'm a browser, I'd do something like: function handle_data(sid, data) { if (is_open_message(data)) { var info = get_stream_info(data) var buffered_data = clear_buffer(sid) fire_ondatachannel(sid, info) fire_ondata(sid, buffered_data) } else if (has_known_stream(sid)) { fire_ondata(sid, data) } else if (buffer_has_space(sid)) { add_to_buffer(sid, data) } else { var buffered_data = clear_buffer(sid) fire_unknownchannelerror_in_js(sid, buffered_data) reset_stream(sid) } } Are there other options I'm missing or didn't understand? On Fri, Apr 19, 2013 at 11:11 AM, Martin Thomson wrote: > On 19 April 2013 09:39, Randell Jesup wrote: > > the Open *will* eventually get through unless you have > > 100% (or virtually so) packet loss > > I'm going to pretend you didn't say that. If you want to talk odds, > that's fine, but I think that you'll find that this sort of error is > far more likely than you realize. We're talking the probability of > incoming data exceeding a given threshold prior to an open being > delivered. After all, unless you have 0% loss, the *possible* maximum > amount of data is infinite. Though large numbers might be of > relatively low probability on an individual basis, operating at scale > you are going to encounter surprising spikes. > > > I honestly feel it's ok to just buffer all incoming packets while > waiting for the Open. > > That's not a warm fuzzy that I share. > > > No one is going to get a gigabyte of data in without an Open... A > > non-browser could fake up a session and start sending data without ever > > sending an Open... but flushing the data doesn't actually help you > against > > that sort of active DOS (they can just start again, they can spread it > > across thousands of channels, etc, etc), and there are FAR better DOS > > methods - all this would do is burn some CPU and some memory. > > I think that would be a mistake. This isn't about denial of service, > it's about genuine usage cases that encounter errors. The receiver > can't use the receive window to apply back pressure if they are > reading from the stream to look for the open message, so you end up > with an unbounded amount of data. The amount of data will scale with > bandwidth delay product. A long, fat pipe might burn more CPU and > memory than you are willing to tolerate. > > Then it comes down to what experience you want to provide to the > unfortunates who encounter this problem. > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > --047d7b15b295d0e7a604dabb8334 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
I like all the discussion, but I feel like we need to get = back to the question and what options we have. =C2=A0The question: "wh= at does the browser do with unexpected data (before an open of an unregiste= red sid)?"

1. Buffer forever without limits: =C2=A0Randell thinks it= 9;s OK to buffer forever without limits. =C2=A0Martin disagrees. =C2=A0I di= sagree (I agree with Martin).
2. Buffer with limits, and then:
=C2=A0 a. =C2=A0Hand an error to JS saying "got some data for a d= ata channel, but an OPEN never came" WITHOUT providing the data to JS:= Harald likes this. =C2=A0I'm OK with this.
=C2=A0 b. =C2=A0H= and an error to JS saying "got some data for a data channel, but an OP= EN never came" WITH providing the data: I like this better, since I do= n't see a reason not to give JS the data. =C2=A0
=C2=A0 c. =C2=A0Fire .ondatachannel: This is what I was was originally= thinking, but I understand the downsides mentioned, and would be happy wit= h (b) instead.
=C2=A0

Right now, it = seems like 2a or 2b is our best options, mixed with resetting the stream. = =C2=A0In other words, if I'm a browser, I'd do something like:

function handle_data(sid, data) {
=C2=A0 = if (is_open_message(data)) {
=C2=A0 =C2=A0 var info =3D get_strea= m_info(data)
=C2=A0 =C2=A0 var buffered_data =3D clear_buff= er(sid)
=C2=A0 =C2=A0 fire_ondatachannel(sid, info)
=C2=A0 =C2=A0 fire_ondata(sid, buffered_data)
=C2=A0 } else if (has_known_stream(sid)) {
=C2=A0 =C2=A0 fir= e_ondata(sid, data)
=C2=A0 } else if (buffer_has_space(sid)) {
=C2=A0 =C2=A0 add_to_buffer(sid, data)
=C2=A0 } else {
=C2=A0 =C2=A0 var buffered_data =3D clear_buffer(sid)
=C2=A0= =C2=A0 fire_unknownchannelerror_in_js(sid, buffered_data)
=C2=A0= =C2=A0 reset_stream(sid)
=C2=A0 }
}

=

Are there other options I'm missing or didn't u= nderstand?



On Fri, Apr 19, 2013 at 11:11 AM, Martin Thomson <martin.thomson@gmail.com> wrote:
On 19 April 2013 09:39, Randell Jesup &= lt;randell-ietf= @jesup.org> wrote:
> the Open *will* eventually get through unless you have
> 100% (or virtually so) packet loss

I'm going to pretend you didn't say that. =C2=A0If you want t= o talk odds,
that's fine, but I think that you'll find that this sort of error i= s
far more likely than you realize. =C2=A0We're talking the probability o= f
incoming data exceeding a given threshold prior to an open being
delivered. =C2=A0After all, unless you have 0% loss, the *possible* maximum=
amount of data is infinite. =C2=A0Though large numbers might be of
relatively low probability on an individual basis, operating at scale
you are going to encounter surprising spikes.

> I honestly feel it's ok to just buffer all incoming packets while = waiting for the Open.

That's not a warm fuzzy that I share.

> No one is going to get a gigabyte of data in without an Open... =C2=A0= A
> non-browser could fake up a session and start sending data without eve= r
> sending an Open... but flushing the data doesn't actually help you= against
> that sort of active DOS (they can just start again, they can spread it=
> across thousands of channels, etc, etc), and there are FAR better DOS<= br> > methods - all this would do is burn some CPU and some memory.

I think that would be a mistake. =C2=A0This isn't about denial of= service,
it's about genuine usage cases that encounter errors. =C2=A0The receive= r
can't use the receive window to apply back pressure if they are
reading from the stream to look for the open message, so you end up
with an unbounded amount of data. =C2=A0The amount of data will scale with<= br> bandwidth delay product. =C2=A0A long, fat pipe might burn more CPU and
memory than you are willing to tolerate.

Then it comes down to what experience you want to provide to the
unfortunates who encounter this problem.
_______________________________________________
rtcweb mailing list
rtcweb@ietf.org = https://www.ietf.org/mailman/listinfo/rtcweb

--047d7b15b295d0e7a604dabb8334-- From bernard_aboba@hotmail.com Fri Apr 19 17:32:07 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1D8BC21F90EB for ; Fri, 19 Apr 2013 17:32:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.598 X-Spam-Level: X-Spam-Status: No, score=-102.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3TABNoL6d+S9 for ; Fri, 19 Apr 2013 17:32:04 -0700 (PDT) Received: from blu0-omc3-s20.blu0.hotmail.com (blu0-omc3-s20.blu0.hotmail.com [65.55.116.95]) by ietfa.amsl.com (Postfix) with ESMTP id 4803021F90D2 for ; Fri, 19 Apr 2013 17:32:04 -0700 (PDT) Received: from BLU169-W71 ([65.55.116.74]) by blu0-omc3-s20.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Fri, 19 Apr 2013 17:32:04 -0700 X-EIP: [zJOECfMAs3B4361r+UmVwf8xZBjMsFkV] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: multipart/alternative; boundary="_cc6913b3-c323-4d3b-b392-b69e1a79dd68_" From: Bernard Aboba To: Peter Thatcher , Martin Thomson Date: Fri, 19 Apr 2013 17:32:04 -0700 Importance: Normal In-Reply-To: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org>, <516CE3EC.2050804@jesup.org>, , , , <516F1AF9.2080301@alvestrand.no>, , <516F9A5A.6080402@alvestrand.no>, , <5170247F.4090908@alvestrand.no>, , <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de>, , <5171734E.3050300@jesup.org>, , MIME-Version: 1.0 X-OriginalArrivalTime: 20 Apr 2013 00:32:04.0228 (UTC) FILETIME=[7B20A440:01CE3D5E] Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 00:32:07 -0000 --_cc6913b3-c323-4d3b-b392-b69e1a79dd68_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Peter Thatcher said:=20 I like all the discussion=2C but I feel like we need to get back to the que= stion and what options we have. The question: "what does the browser do wi= th unexpected data (before an open of an unregistered sid)?"=0A= =0A= =0A= 1. Buffer forever without limits: Randell thinks it's OK to buffer forever= without limits. Martin disagrees. I disagree (I agree with Martin). [BA] This seems like a bad idea. If the receiver is expecting an OPEN then= it shouldn't allow an unlimited amount of (ordered!) data to be received b= efore getting one. If the receiver buffers a large amount of data and pass= es it to the JS even if the application indicated that an OPEN was require= d=2C this might encourage implementations to bypass the OPEN=2C since recei= vers are so tolerant about not getting it even if the application has indic= ated it is required. 2. Buffer with limits=2C and then:=0A= a. Hand an error to JS saying "got some data for a data channel=2C but a= n OPEN never came" WITHOUT providing the data to JS: Harald likes this. I'= m OK with this. [BA] One desirable aspect of this is that it (combined with a stream reset)= limits the potential for attacks or implementation problems to affect appl= ications.=20 b. Hand an error to JS saying "got some data for a data channel=2C but a= n OPEN never came" WITH providing the data: I like this better=2C since I d= on't see a reason not to give JS the data. =20 [BA] For the reasons described above=2C I think we could end up regretting= this option. = --_cc6913b3-c323-4d3b-b392-b69e1a79dd68_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Peter Thatcher said: =3B
=

I like all the discussion=2C but I feel like we n= eed to get back to the question and what options we have.  =3BThe quest= ion: "what does the browser do with unexpected data (before an open of an u= nregistered sid)?"
=0A= =0A= =0A=
1. Buffer forever without limits:  =3BRandell thinks it'= s OK to buffer forever without limits.  =3BMartin disagrees.  =3BI = disagree (I agree with Martin).

[BA] This seems li= ke a bad idea.  =3BIf the receiver is expecting an OPEN then it shouldn= 't allow an unlimited amount of (ordered!) data to be received before getti= ng one.  =3BIf the receiver buffers a large amount of data and passes i= t to the  =3BJS even if the application indicated that an OPEN was requ= ired=2C this might encourage implementations to bypass the OPEN=2C =3B<= span style=3D"font-size: 12pt=3B">since receivers are so tolerant about not= getting it even if the application has indicated it is required.  =3B<= /span>
 =3B
2. Buffer with limits=2C and then:=0A=
 =3B a.  =3BHand an error to JS saying "got some data for a da= ta channel=2C but an OPEN never came" WITHOUT providing the data to JS: Har= ald likes this.  =3BI'm OK with this.

[BA] One= desirable aspect of this is that it (combined with a stream reset) limits = the potential for attacks or implementation problems to affect applications= . =3B

 =3B b.  =3BHand an error to JS = saying "got some data for a data channel=2C but an OPEN never came" WITH pr= oviding the data: I like this better=2C since I don't see a reason not to g= ive JS the data.  =3B

[BA]  =3BFor the rea= sons described above=2C I think we could end up regretting this option.&nbs= p=3B
= --_cc6913b3-c323-4d3b-b392-b69e1a79dd68_-- From bernard_aboba@hotmail.com Fri Apr 19 17:42:21 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1E7AE21F9164 for ; Fri, 19 Apr 2013 17:42:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.598 X-Spam-Level: X-Spam-Status: No, score=-102.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id aw+9Qmq5AZBW for ; Fri, 19 Apr 2013 17:42:20 -0700 (PDT) Received: from blu0-omc3-s4.blu0.hotmail.com (blu0-omc3-s4.blu0.hotmail.com [65.55.116.79]) by ietfa.amsl.com (Postfix) with ESMTP id 3F2CB21F9154 for ; Fri, 19 Apr 2013 17:42:20 -0700 (PDT) Received: from BLU169-W71 ([65.55.116.72]) by blu0-omc3-s4.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Fri, 19 Apr 2013 17:42:20 -0700 X-EIP: [+csZlocf9glV8xUD2QLiL0y8FybESCDa] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: multipart/alternative; boundary="_2eba8471-0ee6-45c7-9515-5f59c5aef85c_" From: Bernard Aboba To: Magnus Westerlund , "rtcweb@ietf.org" Date: Fri, 19 Apr 2013 17:42:19 -0700 Importance: Normal In-Reply-To: <517148E0.7080206@ericsson.com> References: <517148E0.7080206@ericsson.com> MIME-Version: 1.0 X-OriginalArrivalTime: 20 Apr 2013 00:42:20.0333 (UTC) FILETIME=[EA5ACDD0:01CE3D5F] Subject: Re: [rtcweb] RTP Usage: Reducing dependency on codec specifications X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 00:42:21 -0000 --_2eba8471-0ee6-45c7-9515-5f59c5aef85c_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Magnus said:=20 > The latest version of the RTP usage for WebRTC says: >=20 > 4.3. Choice of RTP Payload Formats >=20 > Implementations MUST follow the WebRTC Audio Codec and Processing > Requirements [I-D.ietf-rtcweb-audio] and SHOULD follow the updated > recommendations for audio codecs in the RTP/AVP Profile > [I-D.ietf-avtcore-avp-codecs]. Support for other audio codecs is > OPTIONAL. >=20 > (tbd: the mandatory to implement video codec is not yet decided) >=20 > From this I would like to make two observations. >=20 > The first that the audio codecs draft should actually include the RTP > payload format specification for the codecs it specifies to support. I > strongly think this is the right place because if one later changes the > codec requirements then one only need to update the audio specification > rather than also RTP usage. [BA] I agree with this.=20 > Secondly=2C that it might be best remove strong normative dependencies on > the codec specifications in the RTP usage. We can clearly include > informative references saying that the codec specification for WebRTC > will specify the RTP payload formats to use. This also reduced cross > referencing and dependencies between these specifications. Thus allowing > us to move forward with the RTP usage independent on any continued video > or audio codec discussions that may occur in the WG.>>> Thoughts about th= is? >=20 > I intended to suggest some text for the audio codec draft to improve its > specification of the RTP payload formats related to the codecs. [BA] While I think this makes sense and I sympathize with the goal=2C in pr= actice truly making the RTP usage doc codec-independent could turn out to b= e more difficult than it first appears. One thing I have been noticing is = that the approach to congestion control as well as loss recovery strategies= (e.g. retransmission vs. FEC=2C adapting resolution/framerate via SDP vs. = RTCP=2C use of AVPF feedback messages=2C etc.) may differ markedly between = implementations of VP8 and H.264. This raises the nasty possibility that e= ven if the MTI codec disagreements were to be resolved (or if browsers were= to support codec extensibility) that we'd still be with saddled with persi= stent video interoperability problems. =20 = --_2eba8471-0ee6-45c7-9515-5f59c5aef85c_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Magnus said: =3B

>=3B The latest version of the RTP usage for WebRTC says:
>=3B
= >=3B 4.3. Choice of RTP Payload Formats
>=3B
>=3B Implemen= tations MUST follow the WebRTC Audio Codec and Processing
>=3B Requ= irements [I-D.ietf-rtcweb-audio] and SHOULD follow the updated
>=3B = recommendations for audio codecs in the RTP/AVP Profile
>=3B [I-D.= ietf-avtcore-avp-codecs]. Support for other audio codecs is
>=3B O= PTIONAL.
>=3B
>=3B (tbd: the mandatory to implement video cod= ec is not yet decided)
>=3B
>=3B From this I would like to make = two observations.
>=3B
>=3B The first that the audio codecs draf= t should actually include the RTP
>=3B payload format specification fo= r the codecs it specifies to support. I
>=3B strongly think this is th= e right place because if one later changes the
>=3B codec requirements= then one only need to update the audio specification
>=3B rather than= also RTP usage.

[BA] I agree with this. =3B

>=3B Secondly=2C that it might be best remove strong normati= ve dependencies on
>=3B the codec specifications in the RTP usage. We = can clearly include
>=3B informative references saying that the codec = specification for WebRTC
>=3B will specify the RTP payload formats to = use. This also reduced cross
>=3B referencing and dependencies between= these specifications. Thus allowing
>=3B us to move forward with the = RTP usage independent on any continued video
>=3B or audio codec discu= ssions that may occur in the WG.
>=3B
>=3B
>=3B Thoughts about this?
>=3B
>=3B I intended to suggest so= me text for the audio codec draft to improve its
>=3B specification of= the RTP payload formats related to the codecs.

[B= A] While I think this makes sense and I sympathize with the goal=2C in prac= tice truly making the RTP usage doc codec-independent could turn out to be = more difficult than it first appears.  =3BOne thing I have been noticin= g is that the approach to congestion control as well as loss recovery strat= egies (e.g. retransmission vs. FEC=2C adapting resolution/framerate via SDP= vs. RTCP=2C use of AVPF feedback messages=2C etc.) may differ markedly bet= ween implementations of VP8 and H.264.  =3BThis raises the nasty possib= ility that even if the MTI codec disagreements were to be resolved (or if b= rowsers were to support codec extensibility) that we'd still be with saddle= d with persistent video interoperability problems.  =3B

=
= --_2eba8471-0ee6-45c7-9515-5f59c5aef85c_-- From bernard_aboba@hotmail.com Fri Apr 19 18:04:08 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4CBF421F8E99 for ; Fri, 19 Apr 2013 18:04:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.598 X-Spam-Level: X-Spam-Status: No, score=-102.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GtybcFP+gTu1 for ; Fri, 19 Apr 2013 18:04:07 -0700 (PDT) Received: from blu0-omc3-s26.blu0.hotmail.com (blu0-omc3-s26.blu0.hotmail.com [65.55.116.101]) by ietfa.amsl.com (Postfix) with ESMTP id 12AD721F8CE2 for ; Fri, 19 Apr 2013 18:04:07 -0700 (PDT) Received: from BLU169-W43 ([65.55.116.72]) by blu0-omc3-s26.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Fri, 19 Apr 2013 18:04:07 -0700 X-EIP: [zkhfn9JC2O7U1bovhDI0jK+KpjW3//gF] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: multipart/alternative; boundary="_aba72346-c77f-4326-8d5d-ea66264507c0_" From: Bernard Aboba To: Magnus Westerlund , Randell Jesup Date: Fri, 19 Apr 2013 18:04:06 -0700 Importance: Normal In-Reply-To: <516FBF34.1070500@ericsson.com> References: <516328C9.7070506@jesup.org>,<516FBF34.1070500@ericsson.com> MIME-Version: 1.0 X-OriginalArrivalTime: 20 Apr 2013 01:04:07.0139 (UTC) FILETIME=[F5459330:01CE3D62] Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] Minutes for the Data Channel Presentations X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 01:04:08 -0000 --_aba72346-c77f-4326-8d5d-ea66264507c0_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Magnus said:=20 > I have now updated the minutes trying to clarify the context and the > corrections. Please check if you think this makes it clearer. If not I > am happy to introduce additional clarifications=2C but please be explicit > about what should be changed. >=20 > http://www.ietf.org/proceedings/86/minutes/minutes-86-rtcweb >=20 Peter Thatcher commented that he thinks the presenter's proposal(draft=ADje= sup=ADrtcweb=ADdata=ADprotocol=AD04) is great. [BA] My impression was that this remark more related to the presentation su= ggestions relating to removing of stream negotiation from SDP=2C which isn'= t covered in draft-jesup-rtcweb-data-protocol-04. Harald Alvestrand stated that he Agree with this. Glad got data channelnego= tiation out of the document.=20 [BA] Since draft-jesup-rtcweb-data-protocol is about setting up data chann= els this doesn't make sense to me. Was Harald perhaps referring to getting= data channel negotiation "out of SDP"? =20 = --_aba72346-c77f-4326-8d5d-ea66264507c0_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Magnus said: =3B
>=3B I have now updated the minutes trying to clarify the context and th= e
>=3B corrections. Please check if you think this makes it clearer. I= f not I
>=3B am happy to introduce additional clarifications=2C but pl= ease be explicit
>=3B about what should be changed.
>=3B
>= =3B http://www.ietf.org/proceedings/86/minutes/minutes-86-rtcweb
>=3B =


Peter Thatcher commented that he thi= nks the presenter's proposal
(draft=ADjesup=ADrtcweb=ADdata=ADpro= tocol=AD04)  =3Bis great.

[BA] My impres= sion was that this remark more related to the presentation suggestions rela= ting to removing of stream negotiation from SDP=2C which isn't covered in d= raft-jesup-rtcweb-data-protocol-04.

Harald Al= vestrand stated that he Agree with this. Glad got data channel
ne= gotiation out of the document. =3B

[BA] =  =3BSince draft-jesup-rtcweb-data-protocol is about setting up data cha= nnels this doesn't make sense to me.  =3BWas Harald perhaps referring t= o getting data channel negotiation "out of SDP"?  =3B




= --_aba72346-c77f-4326-8d5d-ea66264507c0_-- From trac+rtcweb@trac.tools.ietf.org Fri Apr 19 18:13:32 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B7F2721F964E for ; Fri, 19 Apr 2013 18:13:32 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.599 X-Spam-Level: X-Spam-Status: No, score=-102.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id or1jUKviqh8D for ; Fri, 19 Apr 2013 18:13:32 -0700 (PDT) Received: from grenache.tools.ietf.org (grenache.tools.ietf.org [IPv6:2a01:3f0:1:2::30]) by ietfa.amsl.com (Postfix) with ESMTP id 187F921F964B for ; Fri, 19 Apr 2013 18:13:31 -0700 (PDT) Received: from localhost ([127.0.0.1]:34982 helo=grenache.tools.ietf.org ident=www-data) by grenache.tools.ietf.org with esmtp (Exim 4.80) (envelope-from ) id 1UTMMm-0000yI-L7; Sat, 20 Apr 2013 03:13:24 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: "rtcweb issue tracker" X-Trac-Version: 0.12.3 Precedence: bulk Auto-Submitted: auto-generated X-Mailer: Trac 0.12.3, by Edgewall Software To: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, bernard_aboba@hotmail.com X-Trac-Project: rtcweb Date: Sat, 20 Apr 2013 01:13:24 -0000 X-URL: http://tools.ietf.org/rtcweb/ X-Trac-Ticket-URL: http://trac.tools.ietf.org/wg/rtcweb/trac/ticket/14 Message-ID: <066.6dfe974121b793946276e7b2bf610a93@trac.tools.ietf.org> X-Trac-Ticket-ID: 14 X-SA-Exim-Connect-IP: 127.0.0.1 X-SA-Exim-Rcpt-To: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, bernard_aboba@hotmail.com, rtcweb@ietf.org X-SA-Exim-Mail-From: trac+rtcweb@trac.tools.ietf.org X-SA-Exim-Scanned: No (on grenache.tools.ietf.org); SAEximRunCond expanded to false Resent-To: csp@csperkins.org, jorg.ott@aalto.fi, magnus.westerlund@ericsson.com Resent-Message-Id: <20130420011332.187F921F964B@ietfa.amsl.com> Resent-Date: Fri, 19 Apr 2013 18:13:31 -0700 (PDT) Resent-From: trac+rtcweb@trac.tools.ietf.org Cc: rtcweb@ietf.org Subject: [rtcweb] #14: Section 4.4: Multiplexing of RTP session over a single UDP flow X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 01:13:32 -0000 #14: Section 4.4: Multiplexing of RTP session over a single UDP flow Support for multiple RTP sessions over a single UDP flow as defined by [I-D.westerlund-avtcore-transport-multiplexing] is RECOMMENDED/ OPTIONAL. If multiple RTP sessions are to be multiplexed onto a single UDP flow, this MUST be negotiated during the signalling phase. (tbd: No consensus on the level of support of Multiple RTP sessions over a single UDP flow.) Further discussion about when different RTP session structures and multiplexing methods are suitable can be found in the memo on Guidelines for using the Multiplexing Features of RTP [I-D.westerlund-avtcore-multiplex-architecture]. [BA] I would suggest that both of these paragraphs be removed. Leaving a normative references to an individual submission that seems unlikely to be advanced to WG work item status soon could delay the document. -- -------------------------------------+------------------------------------- Reporter: | Owner: draft-ietf-rtcweb-rtp- bernard_aboba@hotmail.com | usage@tools.ietf.org Type: defect | Status: new Priority: major | Milestone: milestone1 Component: rtp-usage | Version: 1.0 Severity: Active WG Document | Keywords: -------------------------------------+------------------------------------- Ticket URL: rtcweb From trac+rtcweb@trac.tools.ietf.org Fri Apr 19 18:19:42 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E296E21F8BE4 for ; Fri, 19 Apr 2013 18:19:42 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.599 X-Spam-Level: X-Spam-Status: No, score=-102.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QejBbbcHl0Zr for ; Fri, 19 Apr 2013 18:19:42 -0700 (PDT) Received: from grenache.tools.ietf.org (grenache.tools.ietf.org [IPv6:2a01:3f0:1:2::30]) by ietfa.amsl.com (Postfix) with ESMTP id ECDD521F8B9C for ; Fri, 19 Apr 2013 18:19:41 -0700 (PDT) Received: from localhost ([127.0.0.1]:35222 helo=grenache.tools.ietf.org ident=www-data) by grenache.tools.ietf.org with esmtp (Exim 4.80) (envelope-from ) id 1UTMSp-0005uX-IM; Sat, 20 Apr 2013 03:19:39 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: "rtcweb issue tracker" X-Trac-Version: 0.12.3 Precedence: bulk Auto-Submitted: auto-generated X-Mailer: Trac 0.12.3, by Edgewall Software To: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, bernard_aboba@hotmail.com X-Trac-Project: rtcweb Date: Sat, 20 Apr 2013 01:19:39 -0000 X-URL: http://tools.ietf.org/rtcweb/ X-Trac-Ticket-URL: https://tools.ietf.org/wg/rtcweb/trac/ticket/15 Message-ID: <066.4c5db43349d3176acaa90d17617a02d6@trac.tools.ietf.org> X-Trac-Ticket-ID: 15 X-SA-Exim-Connect-IP: 127.0.0.1 X-SA-Exim-Rcpt-To: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, bernard_aboba@hotmail.com, rtcweb@ietf.org X-SA-Exim-Mail-From: trac+rtcweb@trac.tools.ietf.org X-SA-Exim-Scanned: No (on grenache.tools.ietf.org); SAEximRunCond expanded to false Resent-To: csp@csperkins.org, jorg.ott@aalto.fi, magnus.westerlund@ericsson.com Resent-Message-Id: <20130420011941.ECDD521F8B9C@ietfa.amsl.com> Resent-Date: Fri, 19 Apr 2013 18:19:41 -0700 (PDT) Resent-From: trac+rtcweb@trac.tools.ietf.org Cc: rtcweb@ietf.org Subject: [rtcweb] #15: Section 4.8: SSRC signaling X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 01:19:43 -0000 #15: Section 4.8: SSRC signaling 4.8. Choice of RTP Synchronisation Source (SSRC) Implementations are REQUIRED to support signalled RTP SSRC values, using the "a=ssrc:" SDP attribute defined in Sections 4.1 and 5 of [RFC5576], and MUST also support the "previous-ssrc" source attribute defined in Section 6.2 of [RFC5576]. Other attributes defined in [RFC5576] MAY be supported. Use of the "a=ssrc:" attribute is OPTIONAL. Implementations MUST support random SSRC assignment, and MUST support SSRC collision detection and resolution, both according to [RFC3550]. [BA] I think you need to be more specific here. Does this mean that an implementation needs to be able to render an SSRC that isn't declared in an a=ssrc: attribute? Personally, I'd suggest that this is useful because WebRTC gateways may not know what SSRCs to expect so they can't signal them. Also, it enables operation in RTP topologies (like an RTP translator). However, keep in mind that implicit SSRCs aren't something the current WEBRTC API supports. Also, if you're going to require support for a=ssrc: attributes, there will be other attributes that will come along with that. -- -------------------------------------+------------------------------------- Reporter: | Owner: draft-ietf-rtcweb-rtp- bernard_aboba@hotmail.com | usage@tools.ietf.org Type: defect | Status: new Priority: major | Milestone: milestone1 Component: rtp-usage | Version: 1.0 Severity: Active WG Document | Keywords: -------------------------------------+------------------------------------- Ticket URL: rtcweb From trac+rtcweb@trac.tools.ietf.org Fri Apr 19 18:25:28 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 818FB21F8E6C for ; Fri, 19 Apr 2013 18:25:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.599 X-Spam-Level: X-Spam-Status: No, score=-102.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EB5eztHr+4Ng for ; Fri, 19 Apr 2013 18:25:27 -0700 (PDT) Received: from grenache.tools.ietf.org (grenache.tools.ietf.org [IPv6:2a01:3f0:1:2::30]) by ietfa.amsl.com (Postfix) with ESMTP id C318E21F8E6A for ; Fri, 19 Apr 2013 18:25:27 -0700 (PDT) Received: from localhost ([127.0.0.1]:35676 helo=grenache.tools.ietf.org ident=www-data) by grenache.tools.ietf.org with esmtp (Exim 4.80) (envelope-from ) id 1UTMYP-00021q-4c; Sat, 20 Apr 2013 03:25:25 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: "rtcweb issue tracker" X-Trac-Version: 0.12.3 Precedence: bulk Auto-Submitted: auto-generated X-Mailer: Trac 0.12.3, by Edgewall Software To: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, bernard_aboba@hotmail.com X-Trac-Project: rtcweb Date: Sat, 20 Apr 2013 01:25:25 -0000 X-URL: http://tools.ietf.org/rtcweb/ X-Trac-Ticket-URL: https://tools.ietf.org/wg/rtcweb/trac/ticket/16 Message-ID: <066.dd434dc7b3ac73e1d637e8cf283c2ae0@trac.tools.ietf.org> X-Trac-Ticket-ID: 16 X-SA-Exim-Connect-IP: 127.0.0.1 X-SA-Exim-Rcpt-To: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, bernard_aboba@hotmail.com, rtcweb@ietf.org X-SA-Exim-Mail-From: trac+rtcweb@trac.tools.ietf.org X-SA-Exim-Scanned: No (on grenache.tools.ietf.org); SAEximRunCond expanded to false Resent-To: csp@csperkins.org, jorg.ott@aalto.fi, magnus.westerlund@ericsson.com Resent-Message-Id: <20130420012527.C318E21F8E6A@ietfa.amsl.com> Resent-Date: Fri, 19 Apr 2013 18:25:27 -0700 (PDT) Resent-From: trac+rtcweb@trac.tools.ietf.org Cc: rtcweb@ietf.org Subject: [rtcweb] #16: Section 5.1.6 X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 01:25:28 -0000 #16: Section 5.1.6 WebRTC senders are REQUIRED to implement support for TMMBR messages, and MUST follow bandwidth limitations set by a TMMBR message received for their SSRC. The sending of TMMBR requests is OPTIONAL. [BA] I realize I'm opening a can of worms here, but what does it mean to "follow bandwidth limitations set by a TMMBR message"? Is this mandating support for a receiver-side congestion control mechanism? Or is it considered more like advice from the receiver on average bandwidth availability over some time period (e.g. averaged over I and P frames)? Or is this a maximum simultaneous bw limitation? -- -------------------------------------+------------------------------------- Reporter: | Owner: draft-ietf-rtcweb-rtp- bernard_aboba@hotmail.com | usage@tools.ietf.org Type: defect | Status: new Priority: major | Milestone: milestone1 Component: rtp-usage | Version: 1.0 Severity: Active WG Document | Keywords: -------------------------------------+------------------------------------- Ticket URL: rtcweb From trac+rtcweb@trac.tools.ietf.org Fri Apr 19 18:32:28 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CCADF21F909A for ; Fri, 19 Apr 2013 18:32:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.599 X-Spam-Level: X-Spam-Status: No, score=-102.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id etPcjvJMiX0x for ; Fri, 19 Apr 2013 18:32:28 -0700 (PDT) Received: from grenache.tools.ietf.org (grenache.tools.ietf.org [IPv6:2a01:3f0:1:2::30]) by ietfa.amsl.com (Postfix) with ESMTP id 3BB9021F8FE5 for ; Fri, 19 Apr 2013 18:32:28 -0700 (PDT) Received: from localhost ([127.0.0.1]:35843 helo=grenache.tools.ietf.org ident=www-data) by grenache.tools.ietf.org with esmtp (Exim 4.80) (envelope-from ) id 1UTMfB-0001nR-BB; Sat, 20 Apr 2013 03:32:25 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: "rtcweb issue tracker" X-Trac-Version: 0.12.3 Precedence: bulk Auto-Submitted: auto-generated X-Mailer: Trac 0.12.3, by Edgewall Software To: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, bernard_aboba@hotmail.com X-Trac-Project: rtcweb Date: Sat, 20 Apr 2013 01:32:25 -0000 X-URL: http://tools.ietf.org/rtcweb/ X-Trac-Ticket-URL: https://tools.ietf.org/wg/rtcweb/trac/ticket/17 Message-ID: <066.fa3a1be1719fe32561d53f4f0eb18295@trac.tools.ietf.org> X-Trac-Ticket-ID: 17 X-SA-Exim-Connect-IP: 127.0.0.1 X-SA-Exim-Rcpt-To: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, bernard_aboba@hotmail.com, rtcweb@ietf.org X-SA-Exim-Mail-From: trac+rtcweb@trac.tools.ietf.org X-SA-Exim-Scanned: No (on grenache.tools.ietf.org); SAEximRunCond expanded to false Resent-To: csp@csperkins.org, jorg.ott@aalto.fi, magnus.westerlund@ericsson.com Resent-Message-Id: <20130420013228.3BB9021F8FE5@ietfa.amsl.com> Resent-Date: Fri, 19 Apr 2013 18:32:28 -0700 (PDT) Resent-From: trac+rtcweb@trac.tools.ietf.org Cc: rtcweb@ietf.org Subject: [rtcweb] #17: Section 6.1: Support for NACK X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 01:32:28 -0000 #17: Section 6.1: Support for NACK Senders are REQUIRED to understand the Generic NACK message defined in Section 6.2.1 of [RFC4585], but MAY choose to ignore this feedback (following Section 4.2 of [RFC4585]). [BA] What does it mean to "understand" the generic NACK message? Are we only asking that an implementation not crash if it receives such a message? Or does this mean that support for NACK needs to be declared in "rtcp-fb" attributes? If an implementation can "understand" NACK, and declare support in SDP but then ignore the feedback, what does this achieve? -- -------------------------------------+------------------------------------- Reporter: | Owner: draft-ietf-rtcweb-rtp- bernard_aboba@hotmail.com | usage@tools.ietf.org Type: defect | Status: new Priority: major | Milestone: milestone1 Component: rtp-usage | Version: 1.0 Severity: Active WG Document | Keywords: -------------------------------------+------------------------------------- Ticket URL: rtcweb From trac+rtcweb@trac.tools.ietf.org Fri Apr 19 18:37:32 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 45F9C21F8842 for ; Fri, 19 Apr 2013 18:37:32 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.599 X-Spam-Level: X-Spam-Status: No, score=-102.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id A1RY9M+rcEAd for ; Fri, 19 Apr 2013 18:37:31 -0700 (PDT) Received: from grenache.tools.ietf.org (grenache.tools.ietf.org [IPv6:2a01:3f0:1:2::30]) by ietfa.amsl.com (Postfix) with ESMTP id AAC0B21F8D61 for ; Fri, 19 Apr 2013 18:37:31 -0700 (PDT) Received: from localhost ([127.0.0.1]:36168 helo=grenache.tools.ietf.org ident=www-data) by grenache.tools.ietf.org with esmtp (Exim 4.80) (envelope-from ) id 1UTMk4-0008LD-D4; Sat, 20 Apr 2013 03:37:28 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: "rtcweb issue tracker" X-Trac-Version: 0.12.3 Precedence: bulk Auto-Submitted: auto-generated X-Mailer: Trac 0.12.3, by Edgewall Software To: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, bernard_aboba@hotmail.com X-Trac-Project: rtcweb Date: Sat, 20 Apr 2013 01:37:28 -0000 X-URL: http://tools.ietf.org/rtcweb/ X-Trac-Ticket-URL: https://tools.ietf.org/wg/rtcweb/trac/ticket/18 Message-ID: <066.b392c6b846aaf34b02197d493399c8e9@trac.tools.ietf.org> X-Trac-Ticket-ID: 18 X-SA-Exim-Connect-IP: 127.0.0.1 X-SA-Exim-Rcpt-To: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, bernard_aboba@hotmail.com, rtcweb@ietf.org X-SA-Exim-Mail-From: trac+rtcweb@trac.tools.ietf.org X-SA-Exim-Scanned: No (on grenache.tools.ietf.org); SAEximRunCond expanded to false Resent-To: csp@csperkins.org, jorg.ott@aalto.fi, magnus.westerlund@ericsson.com Resent-Message-Id: <20130420013731.AAC0B21F8D61@ietfa.amsl.com> Resent-Date: Fri, 19 Apr 2013 18:37:31 -0700 (PDT) Resent-From: trac+rtcweb@trac.tools.ietf.org Cc: rtcweb@ietf.org Subject: [rtcweb] #18: Section 6.2: FEC X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 01:37:32 -0000 #18: Section 6.2: FEC At the time of this writing there is no consensus on which, if any, of these FEC schemes is appropriate for use in the WebRTC context. Accordingly, this memo makes no recommendation on the choice of block-based FEC for WebRTC use. [BA] By being vague on both NACK as well as FEC requirements, I think we've set ourselves up for issues with respect to implementation quality if not interoperability. In practice, it may be possible to come up with some advice to FEC implementers (perhaps not at a REQUIRED but a RECOMMENDED level). So I think we might want to revisit this. -- -------------------------------------+------------------------------------- Reporter: | Owner: draft-ietf-rtcweb-rtp- bernard_aboba@hotmail.com | usage@tools.ietf.org Type: defect | Status: new Priority: major | Milestone: milestone1 Component: rtp-usage | Version: 1.0 Severity: Active WG Document | Keywords: -------------------------------------+------------------------------------- Ticket URL: rtcweb From trac+rtcweb@trac.tools.ietf.org Fri Apr 19 18:48:18 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B8F0621F91BB for ; Fri, 19 Apr 2013 18:48:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.599 X-Spam-Level: X-Spam-Status: No, score=-102.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tSd1QlvtuiRg for ; Fri, 19 Apr 2013 18:48:18 -0700 (PDT) Received: from grenache.tools.ietf.org (grenache.tools.ietf.org [IPv6:2a01:3f0:1:2::30]) by ietfa.amsl.com (Postfix) with ESMTP id 0CFB121F91C4 for ; Fri, 19 Apr 2013 18:48:17 -0700 (PDT) Received: from localhost ([127.0.0.1]:36810 helo=grenache.tools.ietf.org ident=www-data) by grenache.tools.ietf.org with esmtp (Exim 4.80) (envelope-from ) id 1UTMuR-0006kY-IH; Sat, 20 Apr 2013 03:48:11 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: "rtcweb issue tracker" X-Trac-Version: 0.12.3 Precedence: bulk Auto-Submitted: auto-generated X-Mailer: Trac 0.12.3, by Edgewall Software To: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, bernard_aboba@hotmail.com X-Trac-Project: rtcweb Date: Sat, 20 Apr 2013 01:48:11 -0000 X-URL: http://tools.ietf.org/rtcweb/ X-Trac-Ticket-URL: https://tools.ietf.org/wg/rtcweb/trac/ticket/19 Message-ID: <066.cafc635ba698c26a8adc82620078c6ab@trac.tools.ietf.org> X-Trac-Ticket-ID: 19 X-SA-Exim-Connect-IP: 127.0.0.1 X-SA-Exim-Rcpt-To: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, bernard_aboba@hotmail.com, rtcweb@ietf.org X-SA-Exim-Mail-From: trac+rtcweb@trac.tools.ietf.org X-SA-Exim-Scanned: No (on grenache.tools.ietf.org); SAEximRunCond expanded to false Resent-To: csp@csperkins.org, jorg.ott@aalto.fi, magnus.westerlund@ericsson.com Resent-Message-Id: <20130420014818.0CFB121F91C4@ietfa.amsl.com> Resent-Date: Fri, 19 Apr 2013 18:48:17 -0700 (PDT) Resent-From: trac+rtcweb@trac.tools.ietf.org Cc: rtcweb@ietf.org Subject: [rtcweb] #19: Section 7.2: Congestion Control Extensions X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 01:48:18 -0000 #19: Section 7.2: Congestion Control Extensions 7.2. RTCP Extensions for Congestion Control As described in Section 5.1.6, the Temporary Maximum Media Stream Bit Rate (TMMBR) request is supported by WebRTC senders. This request can be used by a media receiver to impose limitations on the media sender based on the receiver's determined bit-rate limitations, to provide a limited means of congestion control. (tbd: What other RTP/RTCP extensions are needed?) As described in Section 5.1.6, the Temporary Maximum Media Stream Bit Rate (TMMBR) request is supported by WebRTC senders. This request can be used by a media receiver to impose limitations on the media sender based on the receiver's determined bit-rate limitations, to provide a limited means of congestion control. (tbd: What other RTP/RTCP extensions are needed?) With proprietary congestion control algorithms issues can arise when different algorithms and implementations interact in a communication session. If the different implementations have made different choices in regards to the type of adaptation, for example one sender based, and one receiver based, then one could end up in situation where one direction is dual controlled, when the other direction is not controlled. (tbd: How to ensure that both paths and sender and receiver based solutions can interact) [BA] Some nasty unresolved issues here. In particular, I am concerned about potential gaps in worldview between sender-side and receiver-side congestion control implementations. Is our goal here to guarantee that a sender-side implementation can interoperate with a receiver-side implementation? Or that a sender-side implementation has the information it needs? -- -------------------------------------+------------------------------------- Reporter: | Owner: draft-ietf-rtcweb-rtp- bernard_aboba@hotmail.com | usage@tools.ietf.org Type: defect | Status: new Priority: major | Milestone: milestone1 Component: rtp-usage | Version: 1.0 Severity: Active WG Document | Keywords: -------------------------------------+------------------------------------- Ticket URL: rtcweb From trac+rtcweb@trac.tools.ietf.org Fri Apr 19 18:56:41 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 27FA821F9298 for ; Fri, 19 Apr 2013 18:56:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.599 X-Spam-Level: X-Spam-Status: No, score=-102.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hLTFjmUho9k7 for ; Fri, 19 Apr 2013 18:56:40 -0700 (PDT) Received: from grenache.tools.ietf.org (grenache.tools.ietf.org [IPv6:2a01:3f0:1:2::30]) by ietfa.amsl.com (Postfix) with ESMTP id 7934D21F9265 for ; Fri, 19 Apr 2013 18:56:40 -0700 (PDT) Received: from localhost ([127.0.0.1]:37631 helo=grenache.tools.ietf.org ident=www-data) by grenache.tools.ietf.org with esmtp (Exim 4.80) (envelope-from ) id 1UTN2b-0002fi-IA; Sat, 20 Apr 2013 03:56:37 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: "rtcweb issue tracker" X-Trac-Version: 0.12.3 Precedence: bulk Auto-Submitted: auto-generated X-Mailer: Trac 0.12.3, by Edgewall Software To: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, bernard_aboba@hotmail.com X-Trac-Project: rtcweb Date: Sat, 20 Apr 2013 01:56:37 -0000 X-URL: http://tools.ietf.org/rtcweb/ X-Trac-Ticket-URL: http://trac.tools.ietf.org/wg/rtcweb/trac/ticket/20 Message-ID: <066.c8aa32ad209e20e9da587ad635946918@trac.tools.ietf.org> X-Trac-Ticket-ID: 20 X-SA-Exim-Connect-IP: 127.0.0.1 X-SA-Exim-Rcpt-To: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, bernard_aboba@hotmail.com, rtcweb@ietf.org X-SA-Exim-Mail-From: trac+rtcweb@trac.tools.ietf.org X-SA-Exim-Scanned: No (on grenache.tools.ietf.org); SAEximRunCond expanded to false Resent-To: csp@csperkins.org, jorg.ott@aalto.fi, magnus.westerlund@ericsson.com Resent-Message-Id: <20130420015640.7934D21F9265@ietfa.amsl.com> Resent-Date: Fri, 19 Apr 2013 18:56:40 -0700 (PDT) Resent-From: trac+rtcweb@trac.tools.ietf.org Cc: rtcweb@ietf.org Subject: [rtcweb] #20: Section 12.2: Multiple Sources X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 01:56:41 -0000 #20: Section 12.2: Multiple Sources 12.2. Multiple Sources A WebRTC end-point might have multiple cameras, microphones or audio inputs and thus a single end-point can source multiple RTP media streams of the same media type concurrently. Even if an end-point does not have multiple media sources of the same media type it has to support transmission using multiple SSRCs concurrently in the same RTP session. This is due to the requirement on an WebRTC end-point to support multiple media types in one RTP session. For example, one audio and one video source can result in the end-point sending with two different SSRCs in the same RTP session. As multi-party conferences are supported, as discussed below in Section 12.3, a WebRTC end-point will need to be capable of receiving, decoding and play out multiple RTP media streams of the same type concurrently. tbd: Are any mechanism needed to signal limitations in the number of active SSRC that an end-point can handle? [BA] There are some additional nasty problems that come up here in the case where there are multiple sources that are each utilizing simulcast/layered coding. Among other things, there needs to be a way in RTP (not just SDP) to make it clear how the RTP streams relate. For example, imagine a mixer that is receiving simulcast/layered coding from multiple sources. What set of SSRCs issue from that mixer, and what is contained in the SDES packet that lets a receiver know that the multiple SSRCs represent layered coding from a single source? I presume the SRCNAME document was one attempt at handling this problem, but since that didn't become a WG work item, we're still left with an unfilled need. And no, this isn't handled in any of the GRUMBLE/FUMBLE/MUMBLE proposals. -- -------------------------------------+------------------------------------- Reporter: | Owner: draft-ietf-rtcweb-rtp- bernard_aboba@hotmail.com | usage@tools.ietf.org Type: defect | Status: new Priority: major | Milestone: milestone1 Component: rtp-usage | Version: 1.0 Severity: Active WG Document | Keywords: -------------------------------------+------------------------------------- Ticket URL: rtcweb From bernard_aboba@hotmail.com Fri Apr 19 19:02:48 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 06FAE21F934C for ; Fri, 19 Apr 2013 19:02:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.598 X-Spam-Level: X-Spam-Status: No, score=-102.598 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HTML_MESSAGE=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id coCNSRUeyVkh for ; Fri, 19 Apr 2013 19:02:47 -0700 (PDT) Received: from blu0-omc3-s10.blu0.hotmail.com (blu0-omc3-s10.blu0.hotmail.com [65.55.116.85]) by ietfa.amsl.com (Postfix) with ESMTP id 6C74121F8E4B for ; Fri, 19 Apr 2013 19:02:47 -0700 (PDT) Received: from BLU169-W46 ([65.55.116.74]) by blu0-omc3-s10.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Fri, 19 Apr 2013 19:02:47 -0700 X-EIP: [CAhiEDySG7sTqWTysRR4zhq7Dw8yL0Ty] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: multipart/alternative; boundary="_4a00f92c-955d-4506-bba9-bf61ec0be71a_" From: Bernard Aboba To: "rtcweb@ietf.org" Date: Fri, 19 Apr 2013 19:02:46 -0700 Importance: Normal MIME-Version: 1.0 X-OriginalArrivalTime: 20 Apr 2013 02:02:47.0566 (UTC) FILETIME=[279C1AE0:01CE3D6B] Subject: [rtcweb] More elbow grease on draft-ietf-rtcweb-rtp-usage, please X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 02:02:48 -0000 --_4a00f92c-955d-4506-bba9-bf61ec0be71a_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I just re-read draft-ietf-rtcweb-rtp-usage-06. Unfortunately there are eno= ugh open issues left in this document to drive a convoy of trucks through= =2C and a number of those issues have been open for *years* (e.g. some of t= hese relate to problems that were recognized years before WebRTC came on th= e scene=2C but are still open=2C like simulcast/layered coding). =20 Depressing to realize that even if the MTI video codec issues were to be re= solved=2C we might *still* have interop headaches=2C but that's where I thi= nk we are. =20 = --_4a00f92c-955d-4506-bba9-bf61ec0be71a_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I just re-read draft-ietf-rtcweb= -rtp-usage-06.  =3BUnfortunately there are enough open issues left in t= his document to drive a convoy of trucks through=2C and a number of those i= ssues have been open for *years* (e.g. some of these relate to problems tha= t were recognized years before WebRTC came on the scene=2C but are still op= en=2C like simulcast/layered coding).  =3B

Depressin= g to realize that even if the MTI video codec issues were to be resolved=2C= we might *still* have interop headaches=2C but that's where I think we are= .  =3B


= --_4a00f92c-955d-4506-bba9-bf61ec0be71a_-- From randell-ietf@jesup.org Fri Apr 19 20:21:06 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 08C5A21F91CF for ; Fri, 19 Apr 2013 20:21:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.299 X-Spam-Level: X-Spam-Status: No, score=-1.299 tagged_above=-999 required=5 tests=[AWL=1.299, BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TcAYVl0PjOu7 for ; Fri, 19 Apr 2013 20:21:05 -0700 (PDT) Received: from r2-chicago.webserversystems.com (r2-chicago.webserversystems.com [173.236.101.58]) by ietfa.amsl.com (Postfix) with ESMTP id 18F6D21F91C4 for ; Fri, 19 Apr 2013 20:21:04 -0700 (PDT) Received: from pool-98-111-140-34.phlapa.fios.verizon.net ([98.111.140.34]:3344 helo=[192.168.1.12]) by r2-chicago.webserversystems.com with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.80) (envelope-from ) id 1UTOMJ-0004pP-Qv; Fri, 19 Apr 2013 22:21:04 -0500 Message-ID: <5172091A.5040205@jesup.org> Date: Fri, 19 Apr 2013 23:18:50 -0400 From: Randell Jesup User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: Bernard Aboba References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org>, <516CE3EC.2050804@jesup.org>, , , , <516F1AF9.2080301@alvestrand.no>, , <516F9A5A.6080402@alvestrand.no>, , <5170247F.4090908@alvestrand.no>, , <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de>, , <5171734E.3050300@jesup.org>, , In-Reply-To: Content-Type: multipart/alternative; boundary="------------080301010004000403090209" X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - r2-chicago.webserversystems.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - jesup.org Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 03:21:06 -0000 This is a multi-part message in MIME format. --------------080301010004000403090209 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit On 4/19/2013 8:32 PM, Bernard Aboba wrote: > Peter Thatcher said: > > I like all the discussion, but I feel like we need to get back to the > question and what options we have. The question: "what does the > browser do with unexpected data (before an open of an unregistered sid)?" > > 1. Buffer forever without limits: Randell thinks it's OK to buffer > forever without limits. Martin disagrees. I disagree (I agree with > Martin). > > [BA] This seems like a bad idea. If the receiver is expecting an OPEN > then it shouldn't allow an unlimited amount of (ordered!) data to be > received before getting one. This case only applies in an un-ordered channel I believe, if we send the Open as reliable-in-order. Ordered data must be delivered in-order (!), so the Open must be delivered before any following ordered data. (This is why I said the Open *should* be sent in-order; it removes the need to buffer in an ordered channel.) > If the receiver buffers a large amount of data and passes it to the > JS even if the application indicated that an OPEN was required, this > might encourage implementations to bypass the OPEN, since receivers > are so tolerant about not getting it even if the application has > indicated it is required. Well, if we do decide to timeout or size-out buffering of unordered early data, I wouldn't do so quickly. My example for this would be a data-only application opening an channel just as it's fading out of WiFi/cell coverage, and hasn't picked up the new one yet (going through a tunnel, dead spot in the building, walk down to the basement, etc). I would far rather the transaction 'freeze' and resume when a new connection is picked up (and ICE restart brings the connections alive again), than to have an arbitrary timer cause my app/game/etc to fail in a very very hard-to-test way. In practical terms, it would be Very hard for significant data to end up buffered. The application can deal with timeouts of the entire connection; I don't want to drop the data if the app has decided to stay in suspension waiting for a connection to resume. After all, what is gained by dropping the data? Don't say "knowledge that the channel failed to open" or "the connection is borked" - this isn't a good way to find out about total connection loss, and given we don't have timeouts on opens, I see no reason to insert them in an edge case for open for no useful reason. If you want opens to timeout, that should be part of how Open works (partial-reliable with a max time), not indirectly-in-some-edge-cases like this. > 2. Buffer with limits, and then: > a. Hand an error to JS saying "got some data for a data channel, > but an OPEN never came" WITHOUT providing the data to JS: Harald likes > this. I'm OK with this. > > [BA] One desirable aspect of this is that it (combined with a stream > reset) limits the potential for attacks or implementation problems to > affect applications. Painful for implementers to test, and virtually impossible for application authors to test, even if they realize it's a possibility. > b. Hand an error to JS saying "got some data for a data channel, > but an OPEN never came" WITH providing the data: I like this better, > since I don't see a reason not to give JS the data. > > [BA] For the reasons described above, I think we could end up > regretting this option. I agree, though for different reasons than Bernard. -- Randell Jesup randell-ietf@jesup.org --------------080301010004000403090209 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
On 4/19/2013 8:32 PM, Bernard Aboba wrote:
Peter Thatcher said: 

I like all the discussion, but I feel like we need to get back to the question and what options we have.  The question: "what does the browser do with unexpected data (before an open of an unregistered sid)?"

1. Buffer forever without limits:  Randell thinks it's OK to buffer forever without limits.  Martin disagrees.  I disagree (I agree with Martin).

[BA] This seems like a bad idea.  If the receiver is expecting an OPEN then it shouldn't allow an unlimited amount of (ordered!) data to be received before getting one.

This case only applies in an un-ordered channel I believe, if we send the Open as reliable-in-order.  Ordered data must be delivered in-order (!), so the Open must be delivered before any following ordered data.  (This is why I said the Open *should* be sent in-order; it removes the need to buffer in an ordered channel.)

 If the receiver buffers a large amount of data and passes it to the  JS even if the application indicated that an OPEN was required, this might encourage implementations to bypass the OPEN, since receivers are so tolerant about not getting it even if the application has indicated it is required. 

Well, if we do decide to timeout or size-out buffering of unordered early data, I wouldn't do so quickly.  My example for this would be a data-only application opening an channel just as it's fading out of WiFi/cell coverage, and hasn't picked up the new one yet (going through a tunnel, dead spot in the building, walk down to the basement, etc). 

I would far rather the transaction 'freeze' and resume when a new connection is picked up (and ICE restart brings the connections alive again), than to have an arbitrary timer cause my app/game/etc to fail in a very very hard-to-test way.  In practical terms, it would be Very hard for significant data to end up buffered.  The application can deal with timeouts of the entire connection; I don't want to drop the data if the app has decided to stay in suspension waiting for a connection to resume.  After all, what is gained by dropping the data?  Don't say "knowledge that the channel failed to open" or "the connection is borked" - this isn't a good way to find out about total connection loss, and given we don't have timeouts on opens, I see no reason to insert them in an edge case for open for no useful reason.  If you want opens to timeout, that should be part of how Open works (partial-reliable with a max time), not indirectly-in-some-edge-cases like this.

 
2. Buffer with limits, and then:
  a.  Hand an error to JS saying "got some data for a data channel, but an OPEN never came" WITHOUT providing the data to JS: Harald likes this.  I'm OK with this.

[BA] One desirable aspect of this is that it (combined with a stream reset) limits the potential for attacks or implementation problems to affect applications.

Painful for implementers to test, and virtually impossible for application authors to test, even if they realize it's a possibility.

  b.  Hand an error to JS saying "got some data for a data channel, but an OPEN never came" WITH providing the data: I like this better, since I don't see a reason not to give JS the data.  

[BA]  For the reasons described above, I think we could end up regretting this option. 

I agree, though for different reasons than Bernard.

-- 
Randell Jesup
randell-ietf@jesup.org
--------------080301010004000403090209-- From bernard_aboba@hotmail.com Sat Apr 20 10:15:37 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0E32221F8B07 for ; Sat, 20 Apr 2013 10:15:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.598 X-Spam-Level: X-Spam-Status: No, score=-102.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ri7pI3V-4zOs for ; Sat, 20 Apr 2013 10:15:36 -0700 (PDT) Received: from blu0-omc4-s28.blu0.hotmail.com (blu0-omc4-s28.blu0.hotmail.com [65.55.111.167]) by ietfa.amsl.com (Postfix) with ESMTP id 599F621F85C6 for ; Sat, 20 Apr 2013 10:15:36 -0700 (PDT) Received: from BLU169-W55 ([65.55.111.136]) by blu0-omc4-s28.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Sat, 20 Apr 2013 10:15:36 -0700 X-EIP: [/vQe2zPlIyN91g9XZj7r+Oxpf+x4u6NT] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: multipart/alternative; boundary="_9468b052-4126-4625-825f-52788202560e_" From: Bernard Aboba To: Randell Jesup Date: Sat, 20 Apr 2013 10:15:35 -0700 Importance: Normal In-Reply-To: <5172091A.5040205@jesup.org> References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org>, <516CE3EC.2050804@jesup.org>, , , , <516F1AF9.2080301@alvestrand.no>, , <516F9A5A.6080402@alvestrand.no>, , <5170247F.4090908@alvestrand.no>, , <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de>, , <5171734E.3050300@jesup.org>, , , <5172091A.5040205@jesup.org> MIME-Version: 1.0 X-OriginalArrivalTime: 20 Apr 2013 17:15:36.0280 (UTC) FILETIME=[AC4EA580:01CE3DEA] Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 17:15:37 -0000 --_9468b052-4126-4625-825f-52788202560e_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Randell said: =0A= "Well=2C if we do decide to timeout or size-out buffering of unordered= =0A= early data=2C I wouldn't do so quickly. My example for this would be= =0A= a data-only application opening an channel just as it's fading out=0A= of WiFi/cell coverage... If you want opens to timeout=2C that should be= part of how Open works (partial-reliable with a max time)=2C not ind= irectly-in-some-edge-cases like this." [BA] I agree that it makes sense to = be explicit about the transport properties desired for OPEN. There is a tra= deoff between a timeout/size-out of unordered early data and the amount of = "reliability" that the OPEN will really have. For example=2C if the time= out is more than one and less than 3 RTOinitial=2C then you are effectively= only allowing for the OPEN to be retransmitted once=3B between 3 and 7 RTO= initial=2C twice=3B between 7 and 15 RTOinitial=2C three times=2C etc. In = terms of buffering=2C there are similar implications. The amount of buffer= allocated will determine how many times the OPEN can be retransmitted (or = the amount of time that the endpoint can be out of coverage in the case you= gave). To be resilient=2C I wouldn't recommend a max time of less than 15= seconds=2C and one could argue for 30 seconds or more (e.g. the potential = effect of routing transients). = --_9468b052-4126-4625-825f-52788202560e_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Randell said:

=0A= "Well=2C if we do decide to timeout or size-out buffering of unordered= =0A= early data=2C I wouldn't do so quickly. =3B My example for this wou= ld be=0A= a data-only application opening an channel just as it's fading out=0A= of WiFi/cell coverage... If you want opens to timeout=2C that should be= part of how Open works (partial-reliable with a max time)=2C not ind= irectly-in-some-edge-cases like this."
 =3B
[BA] I agree that it = makes sense to be explicit about the transport properties desired for OPEN.= There is a tradeoff between a timeout/size-out of unordered early data and= the amount of "reliability" that the OPEN will really have. =3B = =3B =3B For example=2C if the timeout is =3Bmore than =3Bone an= d less than =3B3 RTOinitial=2C then you are effectively only allowing f= or the OPEN to be retransmitted once=3B between 3 and 7 RTOinitial=2C twice= =3B between 7 and 15 RTOinitial=2C three times=2C =3Betc. =3B = =3BIn terms of buffering=2C there are similar implications. =3B The amo= unt of buffer =3Ballocated will determine how many times the OPEN can b= e retransmitted (or the amount of time that the endpoint can be out of cove= rage in the case you gave). =3B To be resilient=2C I wouldn't recommend= a =3Bmax time =3Bof less than 15 seconds=2C and one could argue fo= r 30 seconds or more (e.g. the potential effect of routing transients).  =3B
 =3B
= --_9468b052-4126-4625-825f-52788202560e_-- From bernard_aboba@hotmail.com Sat Apr 20 10:24:27 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1D2A921F892B for ; Sat, 20 Apr 2013 10:24:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.598 X-Spam-Level: X-Spam-Status: No, score=-102.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qHYRi7R4oROq for ; Sat, 20 Apr 2013 10:24:25 -0700 (PDT) Received: from blu0-omc4-s19.blu0.hotmail.com (blu0-omc4-s19.blu0.hotmail.com [65.55.111.158]) by ietfa.amsl.com (Postfix) with ESMTP id A0F1B21F8900 for ; Sat, 20 Apr 2013 10:24:25 -0700 (PDT) Received: from BLU169-W125 ([65.55.111.136]) by blu0-omc4-s19.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Sat, 20 Apr 2013 10:24:25 -0700 X-EIP: [3YmUfoZIItAtRrgBiicEhYxTz3qyzCFi] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: multipart/alternative; boundary="_9a1c26be-c03f-46c7-93bf-6fc3e22e5d84_" From: Bernard Aboba To: Randell Jesup Date: Sat, 20 Apr 2013 10:24:25 -0700 Importance: Normal In-Reply-To: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org>, , <516CE3EC.2050804@jesup.org>, , , , , , , , <516F1AF9.2080301@alvestrand.no>, , , , <516F9A5A.6080402@alvestrand.no>, , , , <5170247F.4090908@alvestrand.no>, , , , <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de>, , , , <5171734E.3050300@jesup.org>, , , , , , , <5172091A.5040205@jesup.org>, MIME-Version: 1.0 X-OriginalArrivalTime: 20 Apr 2013 17:24:25.0356 (UTC) FILETIME=[E7A93CC0:01CE3DEB] Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 17:24:27 -0000 --_9a1c26be-c03f-46c7-93bf-6fc3e22e5d84_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable (retransmitted to fix a cut-and-paste error). Randell said: =0A= "Well=2C if we do decide to timeout or size-out buffering of unordered= =0A= early data=2C I wouldn't do so quickly. My example for this would be= =0A= a data-only application opening an channel just as it's fading out=0A= of WiFi/cell coverage... If you want opens to timeout=2C that should be= part of how Open works (partial-reliable with a max time)=2C not ind= irectly-in-some-edge-cases like this." =20 [BA] I agree that it makes sense to be explicit about the transport propert= ies desired for OPEN. There is a tradeoff between a timeout/size-out of uno= rdered early data and the amount of "reliability" that the OPEN will really= have. For example=2C if the timeout is more than one and less than 3 RT= Oinitial=2C then you are effectively only allowing for the OPEN to be retra= nsmitted once=3B between 3 and 7 RTOinitial=2C twice=3B between 7 and 15 RT= Oinitial=2C three times=2C etc. The timeout also limits the amount of time= that the endpoint can be out of coverage in the case you gave. In terms of= buffering=2C there are similar implications. The amount of buffer allocat= ed will determine how many times the OPEN can be retransmitted. To be resi= lient=2C I wouldn't recommend a max time of less than 15 seconds=2C and one= could argue for 30 seconds or more (e.g. the potential effect of routing t= ransients). = --_9a1c26be-c03f-46c7-93bf-6fc3e22e5d84_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
(retransmitted to fix a cut-and-paste error).
 =3B
Ra= ndell said:

=0A= "Well=2C if we do decide to timeout or size-out buffering of unordered= =0A= early data=2C I wouldn't do so quickly. =3B My example for this wou= ld be=0A= a data-only application opening an channel just as it's fading out=0A= of WiFi/cell coverage... If you want opens to timeout=2C that should be= part of how Open works (partial-reliable with a max time)=2C not ind= irectly-in-some-edge-cases like this."
 =3B
[BA] I agree that it = makes sense to be explicit about the transport properties desired for OPEN.= There is a tradeoff between a timeout/size-out of unordered early data and= the amount of "reliability" that the OPEN will really have. =3B = =3B =3B For example=2C if the timeout is =3Bmore than =3Bone an= d less than =3B3 RTOinitial=2C then you are effectively only allowing f= or the OPEN to be retransmitted once=3B between 3 and 7 RTOinitial=2C twice= =3B between 7 and 15 RTOinitial=2C three times=2C =3Betc. =3B = =3BThe timeout also limits =3Bthe amount of time that the endpoint can = be out of coverage in the case you gave. =3BIn terms of buffering=2C th= ere are similar implications. =3B The amount of buffer =3Ballocated= will determine how many times the OPEN can be retransmitted. =3B To be= resilient=2C I wouldn't recommend a =3Bmax time =3Bof less than 15= seconds=2C and one could argue for 30 seconds or more (e.g. the potential = effect of routing transients). =3B
= --_9a1c26be-c03f-46c7-93bf-6fc3e22e5d84_-- From Michael.Tuexen@lurchi.franken.de Sat Apr 20 12:34:43 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2503D21F8653 for ; Sat, 20 Apr 2013 12:34:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TPWIHrBxXl6u for ; Sat, 20 Apr 2013 12:34:42 -0700 (PDT) Received: from mail-n.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) by ietfa.amsl.com (Postfix) with ESMTP id 34AB221F85E8 for ; Sat, 20 Apr 2013 12:34:42 -0700 (PDT) Received: from [192.168.1.102] (p54818039.dip0.t-ipconnect.de [84.129.128.57]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTP id 6D99F1C0B4617; Sat, 20 Apr 2013 21:34:34 +0200 (CEST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=us-ascii From: Michael Tuexen In-Reply-To: Date: Sat, 20 Apr 2013 21:34:33 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <4EF22AE7-A70C-4F15-A8B5-505050E0611A@lurchi.franken.de> References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> <516F9A5A.6080402@alvestrand.no> <5170247F.4090908@alvestrand.no> To: Martin Thomson X-Mailer: Apple Mail (2.1283) Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 19:34:43 -0000 On Apr 18, 2013, at 9:35 PM, Martin Thomson wrote: > On 18 April 2013 11:44, Michael Tuexen = wrote: >> What brings up a question, since I'm not really familiar with the JS = API. >>=20 >> If I have a data channel dc and call close() on the data channel. Are >> incoming messages still delivered, i.e. does onmessage still fire? >=20 > My expectation is that any pending onmessage events would be = suppressed. >=20 And how do you close a datachannel without message loss? I would prefer that if a reliable data channel gets set up, data gets transferred and it is closed without any error indication, there is no message loss. I think this requires that onmessage fires in the CLOSING state. Best regards Michael=20 From Michael.Tuexen@lurchi.franken.de Sat Apr 20 12:38:28 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DCFB021F8E96 for ; Sat, 20 Apr 2013 12:38:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NDKQU5d2leig for ; Sat, 20 Apr 2013 12:38:28 -0700 (PDT) Received: from mail-n.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) by ietfa.amsl.com (Postfix) with ESMTP id C1E9021F8E36 for ; Sat, 20 Apr 2013 12:38:27 -0700 (PDT) Received: from [192.168.1.102] (p54818039.dip0.t-ipconnect.de [84.129.128.57]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTP id CFC941C0B4617; Sat, 20 Apr 2013 21:38:26 +0200 (CEST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=us-ascii From: Michael Tuexen In-Reply-To: <5171734E.3050300@jesup.org> Date: Sat, 20 Apr 2013 21:38:26 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> <516F9A5A.6080402@alvestrand.no> <5170247F.4090908@alvestrand.no> <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de> <5171734E.3050300@jesup.org> To: Randell Jesup X-Mailer: Apple Mail (2.1283) Cc: rtcweb@ietf.org Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 19:38:29 -0000 On Apr 19, 2013, at 6:39 PM, Randell Jesup wrote: > Since we send the Open reliably, barring active attempts to game the = system with a non-browser, the Open *will* eventually get through unless = you have 100% (or virtually so) packet loss (and in that case, nothing = useful, including an error response, is getting through anyways). So I = honestly feel it's ok to just buffer all incoming packets while waiting = for the Open. I'm not sure what you want to protect against: 1. Network conditions resulting in loss of the OPEN_REQ 2. The peer attacking you and violating the protocol spec. If you consider 1., SCTP will get the message through or fail the SCTP = association eventually. In the BSD stack we even limit the number of retransmissions of a = particular chunk. If that number is reached, the association is failed. We used this to protect = against buggy peers or path MTU problems. Best regards Michael >=20 > No one is going to get a gigabyte of data in without an Open... A = non-browser could fake up a session and start sending data without ever = sending an Open... but flushing the data doesn't actually help you = against that sort of active DOS (they can just start again, they can = spread it across thousands of channels, etc, etc), and there are FAR = better DOS methods - all this would do is burn some CPU and some memory. >=20 > --=20 > Randell Jesup > randell-ietf@jesup.org >=20 > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb >=20 From Michael.Tuexen@lurchi.franken.de Sat Apr 20 12:41:59 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3FD7B21F91B2 for ; Sat, 20 Apr 2013 12:41:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MJy2cmlBij1e for ; Sat, 20 Apr 2013 12:41:58 -0700 (PDT) Received: from mail-n.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) by ietfa.amsl.com (Postfix) with ESMTP id 52AF821F911E for ; Sat, 20 Apr 2013 12:41:58 -0700 (PDT) Received: from [192.168.1.102] (p54818039.dip0.t-ipconnect.de [84.129.128.57]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTP id 482B51C0B4617; Sat, 20 Apr 2013 21:41:57 +0200 (CEST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=us-ascii From: Michael Tuexen In-Reply-To: Date: Sat, 20 Apr 2013 21:41:56 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <5BD3CA4B-35A2-4EEA-8B4A-F05680E115B3@lurchi.franken.de> References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> <516F9A5A.6080402@alvestrand.no> <5170247F.4090908@alvestrand.no> <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de> <5171734E.3050300@jesup.org> To: Martin Thomson X-Mailer: Apple Mail (2.1283) Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 19:41:59 -0000 On Apr 19, 2013, at 8:11 PM, Martin Thomson wrote: > On 19 April 2013 09:39, Randell Jesup wrote: >> the Open *will* eventually get through unless you have >> 100% (or virtually so) packet loss >=20 > I'm going to pretend you didn't say that. If you want to talk odds, > that's fine, but I think that you'll find that this sort of error is > far more likely than you realize. We're talking the probability of > incoming data exceeding a given threshold prior to an open being > delivered. After all, unless you have 0% loss, the *possible* maximum > amount of data is infinite. Though large numbers might be of > relatively low probability on an individual basis, operating at scale > you are going to encounter surprising spikes. >=20 >> I honestly feel it's ok to just buffer all incoming packets while = waiting for the Open. >=20 > That's not a warm fuzzy that I share. >=20 >> No one is going to get a gigabyte of data in without an Open... A >> non-browser could fake up a session and start sending data without = ever >> sending an Open... but flushing the data doesn't actually help you = against >> that sort of active DOS (they can just start again, they can spread = it >> across thousands of channels, etc, etc), and there are FAR better DOS >> methods - all this would do is burn some CPU and some memory. >=20 > I think that would be a mistake. This isn't about denial of service, > it's about genuine usage cases that encounter errors. The receiver > can't use the receive window to apply back pressure if they are > reading from the stream to look for the open message, so you end up > with an unbounded amount of data. The amount of data will scale with > bandwidth delay product. A long, fat pipe might burn more CPU and > memory than you are willing to tolerate. If you are thinking about a sender violating the spec, then you are = right. If the sender is following the spec, then SCTP will get the OPEN_REQ = through. The amount of data is limited by the send buffer size, since all data = sent after the OPEN_REQ is only SACKed and needs to be buffered (unless you = use NR_SACKs). Best regards Michael >=20 > Then it comes down to what experience you want to provide to the > unfortunates who encounter this problem. > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb >=20 From Michael.Tuexen@lurchi.franken.de Sat Apr 20 12:45:56 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9797A21F892B for ; Sat, 20 Apr 2013 12:45:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nxkQ02PizIxs for ; Sat, 20 Apr 2013 12:45:55 -0700 (PDT) Received: from mail-n.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) by ietfa.amsl.com (Postfix) with ESMTP id 7351821F8900 for ; Sat, 20 Apr 2013 12:45:55 -0700 (PDT) Received: from [192.168.1.102] (p54818039.dip0.t-ipconnect.de [84.129.128.57]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTP id 452651C0B4617; Sat, 20 Apr 2013 21:45:54 +0200 (CEST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=iso-8859-1 From: Michael Tuexen In-Reply-To: Date: Sat, 20 Apr 2013 21:45:53 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org>, <516CE3EC.2050804@jesup.org>, , , , <516F1AF9.2080301@alvestrand.no>, , <516F9A5A.6080402@alvestrand.no>, , <5170247F.4090908@alvestrand.no>, , <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de>, , <5171734E.3050300@jesup.org>, , To: Bernard Aboba X-Mailer: Apple Mail (2.1283) Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 19:45:56 -0000 On Apr 20, 2013, at 2:32 AM, Bernard Aboba wrote: > Peter Thatcher said:=20 >=20 > I like all the discussion, but I feel like we need to get back to the = question and what options we have. The question: "what does the browser = do with unexpected data (before an open of an unregistered sid)?" >=20 > 1. Buffer forever without limits: Randell thinks it's OK to buffer = forever without limits. Martin disagrees. I disagree (I agree with = Martin). >=20 > [BA] This seems like a bad idea. If the receiver is expecting an OPEN = then it shouldn't allow an unlimited amount of (ordered!) data to be = received before getting one. If the receiver buffers a large amount of = data and passes it=20 If the peer is sending ordered data and the first received message is = not an OPEN, this is a violation of the spec and I would terminate the SCTP association. > to the JS even if the application indicated that an OPEN was = required, this might encourage implementations to bypass the OPEN, since = receivers are so tolerant about not getting it even if the application = has indicated it is required. =20 > =20 > 2. Buffer with limits, and then: > a. Hand an error to JS saying "got some data for a data channel, = but an OPEN never came" WITHOUT providing the data to JS: Harald likes = this. I'm OK with this. >=20 > [BA] One desirable aspect of this is that it (combined with a stream = reset) limits the potential for attacks or implementation problems to = affect applications.=20 >=20 > b. Hand an error to JS saying "got some data for a data channel, = but an OPEN never came" WITH providing the data: I like this better, = since I don't see a reason not to give JS the data. =20 >=20 > [BA] For the reasons described above, I think we could end up = regretting this option.=20 > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From Michael.Tuexen@lurchi.franken.de Sat Apr 20 12:48:51 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C5C4B21F9265 for ; Sat, 20 Apr 2013 12:48:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NNwRt9N7Q-A6 for ; Sat, 20 Apr 2013 12:48:50 -0700 (PDT) Received: from mail-n.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) by ietfa.amsl.com (Postfix) with ESMTP id 00EC721F925B for ; Sat, 20 Apr 2013 12:48:49 -0700 (PDT) Received: from [192.168.1.102] (p54818039.dip0.t-ipconnect.de [84.129.128.57]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTP id 8FE631C0B4617; Sat, 20 Apr 2013 21:48:46 +0200 (CEST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=iso-8859-1 From: Michael Tuexen In-Reply-To: Date: Sat, 20 Apr 2013 21:48:45 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org>, , <516CE3EC.2050804@jesup.org>, , , , , , , , <516F1AF9.2080301@alvestrand.no>, , , , <516F9A5A.6080402@alvestrand.no>, , , , <5170247F.4090908@alvestrand.no>, , , , <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de>, , , , <5171734E.3050300@jesup.org>, , , , , , , <5172091A.5040205@jesup.org>, To: Bernard Aboba X-Mailer: Apple Mail (2.1283) Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Apr 2013 19:48:51 -0000 On Apr 20, 2013, at 7:24 PM, Bernard Aboba wrote: > (retransmitted to fix a cut-and-paste error).=20 > =20 > Randell said: >=20 > "Well, if we do decide to timeout or size-out buffering of unordered = early data, I wouldn't do so quickly. My example for this would be a = data-only application opening an channel just as it's fading out of = WiFi/cell coverage... If you want opens to timeout, that should be part = of how Open works (partial-reliable with a max time), not = indirectly-in-some-edge-cases like this." > =20 > [BA] I agree that it makes sense to be explicit about the transport = properties desired for OPEN. There is a tradeoff between a = timeout/size-out of unordered early data and the amount of "reliability" = that the OPEN will really have. For example, if the timeout is more = than one and less than 3 RTOinitial, then you are effectively only = allowing for the OPEN to be retransmitted once; between 3 and 7 = RTOinitial, twice; between 7 and 15 RTOinitial, three times, etc. The = timeout also limits the amount of time that the endpoint can be out of = coverage in the case you gave. In terms of buffering, there are similar = implications. The amount of buffer allocated will determine how many = times the OPEN can be retransmitted. To be resilient, I wouldn't = recommend a max time of less than 15 seconds, and one could argue for 30 = seconds or more (e.g. the potential effect of routing transients).=20 SCTP provides already mechanisms to determine that the connectivity os = lost and the SCTP association is terminated. The parameter to control this is the number = of consecutive timer-based retransmissions. Why not just make use of these mechanisms. Best regards Michael > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From harald@alvestrand.no Sat Apr 20 17:34:51 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4E84321F88A9 for ; Sat, 20 Apr 2013 17:34:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -108.647 X-Spam-Level: X-Spam-Status: No, score=-108.647 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, DATE_IN_PAST_03_06=0.044, RCVD_ILLEGAL_IP=1.908, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TeM8ml3yFG60 for ; Sat, 20 Apr 2013 17:34:50 -0700 (PDT) Received: from eikenes.alvestrand.no (eikenes.alvestrand.no [158.38.152.233]) by ietfa.amsl.com (Postfix) with ESMTP id 1985521F8709 for ; Sat, 20 Apr 2013 17:34:50 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by eikenes.alvestrand.no (Postfix) with ESMTP id D336F39E0FE for ; Sun, 21 Apr 2013 02:34:48 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at eikenes.alvestrand.no Received: from eikenes.alvestrand.no ([127.0.0.1]) by localhost (eikenes.alvestrand.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nQu+TqCuqDUS for ; Sun, 21 Apr 2013 02:34:48 +0200 (CEST) Received: from [192.168.0.48] (unknown [1.209.1.135]) by eikenes.alvestrand.no (Postfix) with ESMTPSA id 6EE5E39E091 for ; Sun, 21 Apr 2013 02:34:47 +0200 (CEST) Message-ID: <5172F83A.5030307@alvestrand.no> Date: Sat, 20 Apr 2013 22:19:06 +0200 From: Harald Alvestrand User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <517148E0.7080206@ericsson.com> In-Reply-To: <517148E0.7080206@ericsson.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Subject: Re: [rtcweb] RTP Usage: Reducing dependency on codec specifications X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 21 Apr 2013 00:34:51 -0000 I may be too simple-minded, but why isn't the correct reference to codecs in "RTP usage" a simple note saying "Mandatory to implement codecs for RTCWEB are not specified in this memo." or even less than that: "" ? I simply don't see why it should need to be mentioned in this document. On 04/19/2013 03:38 PM, Magnus Westerlund wrote: > WG, > As Individual and Editor of the WG document: > > The latest version of the RTP usage for WebRTC says: > > 4.3. Choice of RTP Payload Formats > > Implementations MUST follow the WebRTC Audio Codec and Processing > Requirements [I-D.ietf-rtcweb-audio] and SHOULD follow the updated > recommendations for audio codecs in the RTP/AVP Profile > [I-D.ietf-avtcore-avp-codecs]. Support for other audio codecs is > OPTIONAL. > > (tbd: the mandatory to implement video codec is not yet decided) > > From this I would like to make two observations. > > The first that the audio codecs draft should actually include the RTP > payload format specification for the codecs it specifies to support. I > strongly think this is the right place because if one later changes the > codec requirements then one only need to update the audio specification > rather than also RTP usage. > > Secondly, that it might be best remove strong normative dependencies on > the codec specifications in the RTP usage. We can clearly include > informative references saying that the codec specification for WebRTC > will specify the RTP payload formats to use. This also reduced cross > referencing and dependencies between these specifications. Thus allowing > us to move forward with the RTP usage independent on any continued video > or audio codec discussions that may occur in the WG. > > I propose that we change the first paragraph and remove the open issue > (tbd) listed after so the text instead reads: > > 4.3. Choice of RTP Payload Formats > > The RTP payload formats to support depends on the media codecs that an > implementation supports for media transport in WebRTC. These includes > any codec mandated by other WebRTC codec specifications, such as the > audio codecs specified in WebRTC Audio Codec and Processing Requirements > [I-D.ietf-rtcweb-audio], or recommended by the RTP profile in use, see > Update to Recommended Codecs for the RTP Profile for Audio and Video > Conferences with Minimal Control (RTP/AVP) > [I-D.ietf-avtcore-avp-codecs]. Support of any additional codecs and > their RTP payload formats is OPTIONAL. > > > Thoughts about this? > > I intended to suggest some text for the audio codec draft to improve its > specification of the RTP payload formats related to the codecs. > > Cheers > > Magnus Westerlund > > ---------------------------------------------------------------------- > Multimedia Technologies, Ericsson Research EAB/TVM > ---------------------------------------------------------------------- > Ericsson AB | Phone +46 10 7148287 > Färögatan 6 | Mobile +46 73 0949079 > SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com > ---------------------------------------------------------------------- > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From harald@alvestrand.no Sat Apr 20 17:35:02 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 655C821F8952 for ; Sat, 20 Apr 2013 17:35:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -108.668 X-Spam-Level: X-Spam-Status: No, score=-108.668 tagged_above=-999 required=5 tests=[AWL=0.021, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_ILLEGAL_IP=1.908, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NIZIyLCYLX7V for ; Sat, 20 Apr 2013 17:35:01 -0700 (PDT) Received: from eikenes.alvestrand.no (eikenes.alvestrand.no [158.38.152.233]) by ietfa.amsl.com (Postfix) with ESMTP id D787221F8709 for ; Sat, 20 Apr 2013 17:35:00 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by eikenes.alvestrand.no (Postfix) with ESMTP id 0CE9539E091 for ; Sun, 21 Apr 2013 02:35:00 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at eikenes.alvestrand.no Received: from eikenes.alvestrand.no ([127.0.0.1]) by localhost (eikenes.alvestrand.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9BJzo0ux17WY for ; Sun, 21 Apr 2013 02:34:58 +0200 (CEST) Received: from [192.168.0.48] (unknown [1.209.1.135]) by eikenes.alvestrand.no (Postfix) with ESMTPSA id 9029039E0FE for ; Sun, 21 Apr 2013 02:34:57 +0200 (CEST) Message-ID: <5173341D.4020606@alvestrand.no> Date: Sun, 21 Apr 2013 02:34:37 +0200 From: Harald Alvestrand User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org>, <516CE3EC.2050804@jesup.org>, , , , <516F1AF9.2080301@alvestrand.no>, , <516F9A5A.6080402@alvestrand.no>, , <5170247F.4090908@alvestrand.no>, , <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de>, , <5171734E.3050300@jesup.org>, , <5172091A.5040205@jesup .org> In-Reply-To: <5172091A.5040205@jesup.org> Content-Type: multipart/alternative; boundary="------------080208000109010006080409" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 21 Apr 2013 00:35:02 -0000 This is a multi-part message in MIME format. --------------080208000109010006080409 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit On 04/20/2013 05:18 AM, Randell Jesup wrote: > On 4/19/2013 8:32 PM, Bernard Aboba wrote: >> Peter Thatcher said: >> >> I like all the discussion, but I feel like we need to get back to the >> question and what options we have. The question: "what does the >> browser do with unexpected data (before an open of an unregistered >> sid)?" >> >> 1. Buffer forever without limits: Randell thinks it's OK to buffer >> forever without limits. Martin disagrees. I disagree (I agree with >> Martin). >> >> [BA] This seems like a bad idea. If the receiver is expecting an >> OPEN then it shouldn't allow an unlimited amount of (ordered!) data >> to be received before getting one. > > This case only applies in an un-ordered channel I believe, if we send > the Open as reliable-in-order. Ordered data must be delivered > in-order (!), so the Open must be delivered before any following > ordered data. (This is why I said the Open *should* be sent in-order; > it removes the need to buffer in an ordered channel.) > >> If the receiver buffers a large amount of data and passes it to the >> JS even if the application indicated that an OPEN was required, this >> might encourage implementations to bypass the OPEN, since receivers >> are so tolerant about not getting it even if the application has >> indicated it is required. > > Well, if we do decide to timeout or size-out buffering of unordered > early data, I wouldn't do so quickly. My example for this would be a > data-only application opening an channel just as it's fading out of > WiFi/cell coverage, and hasn't picked up the new one yet (going > through a tunnel, dead spot in the building, walk down to the > basement, etc). > > I would far rather the transaction 'freeze' and resume when a new > connection is picked up (and ICE restart brings the connections alive > again), than to have an arbitrary timer cause my app/game/etc to fail > in a very very hard-to-test way. In practical terms, it would be Very > hard for significant data to end up buffered. File transfer protocol: OPEN, send data unordered with in-band file block positions, close. If the OPEN packet gets lost, data will accumulate mighty fast. > The application can deal with timeouts of the entire connection; I > don't want to drop the data if the app has decided to stay in > suspension waiting for a connection to resume. After all, what is > gained by dropping the data? Don't say "knowledge that the channel > failed to open" or "the connection is borked" - this isn't a good way > to find out about total connection loss, and given we don't have > timeouts on opens, I see no reason to insert them in an edge case for > open for no useful reason. If you want opens to timeout, that should > be part of how Open works (partial-reliable with a max time), not > indirectly-in-some-edge-cases like this. Partial-reliable with max time for Open might be a very good idea. > >> 2. Buffer with limits, and then: >> a. Hand an error to JS saying "got some data for a data channel, >> but an OPEN never came" WITHOUT providing the data to JS: Harald >> likes this. I'm OK with this. >> >> [BA] One desirable aspect of this is that it (combined with a stream >> reset) limits the potential for attacks or implementation problems to >> affect applications. > > Painful for implementers to test, and virtually impossible for > application authors to test, even if they realize it's a possibility. Hmm. I wonder if this is really very easy to test: Tell the sending app you're not going to use OPEN, and tell the receiving app you're going to use OPEN. Send data. > >> b. Hand an error to JS saying "got some data for a data channel, >> but an OPEN never came" WITH providing the data: I like this better, >> since I don't see a reason not to give JS the data. >> >> [BA] For the reasons described above, I think we could end up >> regretting this option. > > I agree, though for different reasons than Bernard. > > -- > Randell Jesup > randell-ietf@jesup.org > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb --------------080208000109010006080409 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
On 04/20/2013 05:18 AM, Randell Jesup wrote:
On 4/19/2013 8:32 PM, Bernard Aboba wrote:
Peter Thatcher said: 

I like all the discussion, but I feel like we need to get back to the question and what options we have.  The question: "what does the browser do with unexpected data (before an open of an unregistered sid)?"

1. Buffer forever without limits:  Randell thinks it's OK to buffer forever without limits.  Martin disagrees.  I disagree (I agree with Martin).

[BA] This seems like a bad idea.  If the receiver is expecting an OPEN then it shouldn't allow an unlimited amount of (ordered!) data to be received before getting one.

This case only applies in an un-ordered channel I believe, if we send the Open as reliable-in-order.  Ordered data must be delivered in-order (!), so the Open must be delivered before any following ordered data.  (This is why I said the Open *should* be sent in-order; it removes the need to buffer in an ordered channel.)

 If the receiver buffers a large amount of data and passes it to the  JS even if the application indicated that an OPEN was required, this might encourage implementations to bypass the OPEN, since receivers are so tolerant about not getting it even if the application has indicated it is required. 

Well, if we do decide to timeout or size-out buffering of unordered early data, I wouldn't do so quickly.  My example for this would be a data-only application opening an channel just as it's fading out of WiFi/cell coverage, and hasn't picked up the new one yet (going through a tunnel, dead spot in the building, walk down to the basement, etc). 

I would far rather the transaction 'freeze' and resume when a new connection is picked up (and ICE restart brings the connections alive again), than to have an arbitrary timer cause my app/game/etc to fail in a very very hard-to-test way.  In practical terms, it would be Very hard for significant data to end up buffered.

File transfer protocol: OPEN, send data unordered with in-band file block positions, close.
If the OPEN packet gets lost, data will accumulate mighty fast.

  The application can deal with timeouts of the entire connection; I don't want to drop the data if the app has decided to stay in suspension waiting for a connection to resume.  After all, what is gained by dropping the data?  Don't say "knowledge that the channel failed to open" or "the connection is borked" - this isn't a good way to find out about total connection loss, and given we don't have timeouts on opens, I see no reason to insert them in an edge case for open for no useful reason.  If you want opens to timeout, that should be part of how Open works (partial-reliable with a max time), not indirectly-in-some-edge-cases like this.

Partial-reliable with max time for Open might be a very good idea.

 
2. Buffer with limits, and then:
  a.  Hand an error to JS saying "got some data for a data channel, but an OPEN never came" WITHOUT providing the data to JS: Harald likes this.  I'm OK with this.

[BA] One desirable aspect of this is that it (combined with a stream reset) limits the potential for attacks or implementation problems to affect applications.

Painful for implementers to test, and virtually impossible for application authors to test, even if they realize it's a possibility.

Hmm. I wonder if this is really very easy to test: Tell the sending app you're not going to use OPEN, and tell the receiving app you're going to use OPEN. Send data.



  b.  Hand an error to JS saying "got some data for a data channel, but an OPEN never came" WITH providing the data: I like this better, since I don't see a reason not to give JS the data.  

[BA]  For the reasons described above, I think we could end up regretting this option. 

I agree, though for different reasons than Bernard.

-- 
Randell Jesup
randell-ietf@jesup.org


_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
https://www.ietf.org/mailman/listinfo/rtcweb

--------------080208000109010006080409-- From Michael.Tuexen@lurchi.franken.de Sun Apr 21 03:26:42 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4FF1821F8EAD for ; Sun, 21 Apr 2013 03:26:42 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3KVzpb6Qy3GE for ; Sun, 21 Apr 2013 03:26:41 -0700 (PDT) Received: from mail-n.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) by ietfa.amsl.com (Postfix) with ESMTP id EDDE221F84F5 for ; Sun, 21 Apr 2013 03:26:40 -0700 (PDT) Received: from [192.168.1.102] (p54818039.dip0.t-ipconnect.de [84.129.128.57]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTP id 14C791C0B4612; Sun, 21 Apr 2013 12:26:39 +0200 (CEST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=iso-8859-1 From: Michael Tuexen In-Reply-To: <5173341D.4020606@alvestrand.no> Date: Sun, 21 Apr 2013 12:26:39 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <1C4912CE-439D-48BF-9CE6-D4D9CB64E2CD@lurchi.franken.de> References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org>, <516CE3EC.2050804@jesup.org>, , , , <516F1AF9.2080301@alvestrand.no>, , <516F9A5A.6080402@alvestrand.no>, , <5170247F.4090908@alvestrand.no>, , <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de>, , <5171734E.3050300@jesup.org>, , <5172091A.5040205@jesup .org> <5173341D.4020606@alvestrand.no> To: Harald Alvestrand X-Mailer: Apple Mail (2.1283) Cc: rtcweb@ietf.org Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 21 Apr 2013 10:26:42 -0000 On Apr 21, 2013, at 2:34 AM, Harald Alvestrand wrote: > On 04/20/2013 05:18 AM, Randell Jesup wrote: >> On 4/19/2013 8:32 PM, Bernard Aboba wrote: >>> Peter Thatcher said:=20 >>>=20 >>> I like all the discussion, but I feel like we need to get back to = the question and what options we have. The question: "what does the = browser do with unexpected data (before an open of an unregistered = sid)?" >>>=20 >>> 1. Buffer forever without limits: Randell thinks it's OK to buffer = forever without limits. Martin disagrees. I disagree (I agree with = Martin). >>>=20 >>> [BA] This seems like a bad idea. If the receiver is expecting an = OPEN then it shouldn't allow an unlimited amount of (ordered!) data to = be received before getting one. >>=20 >> This case only applies in an un-ordered channel I believe, if we send = the Open as reliable-in-order. Ordered data must be delivered in-order = (!), so the Open must be delivered before any following ordered data. = (This is why I said the Open *should* be sent in-order; it removes the = need to buffer in an ordered channel.) >>=20 >>> If the receiver buffers a large amount of data and passes it to the = JS even if the application indicated that an OPEN was required, this = might encourage implementations to bypass the OPEN, since receivers are = so tolerant about not getting it even if the application has indicated = it is required. =20 >>=20 >> Well, if we do decide to timeout or size-out buffering of unordered = early data, I wouldn't do so quickly. My example for this would be a = data-only application opening an channel just as it's fading out of = WiFi/cell coverage, and hasn't picked up the new one yet (going through = a tunnel, dead spot in the building, walk down to the basement, etc). =20= >>=20 >> I would far rather the transaction 'freeze' and resume when a new = connection is picked up (and ICE restart brings the connections alive = again), than to have an arbitrary timer cause my app/game/etc to fail in = a very very hard-to-test way. In practical terms, it would be Very hard = for significant data to end up buffered. >=20 > File transfer protocol: OPEN, send data unordered with in-band file = block positions, close. > If the OPEN packet gets lost, data will accumulate mighty fast. If it gets dropped on the wire and transmission continues, it gets = retransmitted roughly after an RTT. The amount of data is limited by the socket buffer size of the peer. >=20 >> The application can deal with timeouts of the entire connection; I = don't want to drop the data if the app has decided to stay in suspension = waiting for a connection to resume. After all, what is gained by = dropping the data? Don't say "knowledge that the channel failed to = open" or "the connection is borked" - this isn't a good way to find out = about total connection loss, and given we don't have timeouts on opens, = I see no reason to insert them in an edge case for open for no useful = reason. If you want opens to timeout, that should be part of how Open = works (partial-reliable with a max time), not = indirectly-in-some-edge-cases like this. >=20 > Partial-reliable with max time for Open might be a very good idea. Which means you can't rely on getting an Open... Why not send the open = request reliable and ordered. Send all following user data ordered (no matter if the data channel is = ordered or not) until the first message of the peer is received. This limits the amount of data to the local socket buffer size. You = might have suboptimal performance until a data message flows in the backwards direction, but that is the = price for protection. Using your example from above, I guess the receiver of the file sends = requests for the block positions, so it wouldn't hurt. Best regards Michael >>=20 >>> =20 >>> 2. Buffer with limits, and then: >>> a. Hand an error to JS saying "got some data for a data channel, = but an OPEN never came" WITHOUT providing the data to JS: Harald likes = this. I'm OK with this. >>>=20 >>> [BA] One desirable aspect of this is that it (combined with a stream = reset) limits the potential for attacks or implementation problems to = affect applications.=20 >>=20 >> Painful for implementers to test, and virtually impossible for = application authors to test, even if they realize it's a possibility. >=20 > Hmm. I wonder if this is really very easy to test: Tell the sending = app you're not going to use OPEN, and tell the receiving app you're = going to use OPEN. Send data. >=20 >=20 >>=20 >>> b. Hand an error to JS saying "got some data for a data channel, = but an OPEN never came" WITH providing the data: I like this better, = since I don't see a reason not to give JS the data. =20 >>>=20 >>> [BA] For the reasons described above, I think we could end up = regretting this option.=20 >>=20 >> I agree, though for different reasons than Bernard. >>=20 >> --=20 >> Randell Jesup >>=20 >> randell-ietf@jesup.org >>=20 >>=20 >> _______________________________________________ >> rtcweb mailing list >>=20 >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb >=20 > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From emil@sip-communicator.org Sun Apr 21 06:42:33 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A65DD21F8A48 for ; Sun, 21 Apr 2013 06:42:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lJXUDbrDR6ui for ; Sun, 21 Apr 2013 06:42:32 -0700 (PDT) Received: from mail-we0-x232.google.com (mail-we0-x232.google.com [IPv6:2a00:1450:400c:c03::232]) by ietfa.amsl.com (Postfix) with ESMTP id A17CD21F8A00 for ; Sun, 21 Apr 2013 06:42:32 -0700 (PDT) Received: by mail-we0-f178.google.com with SMTP id z53so5523317wey.9 for ; Sun, 21 Apr 2013 06:42:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:message-id:date:from:organization:user-agent :mime-version:to:cc:subject:references:in-reply-to:content-type :content-transfer-encoding:x-gm-message-state; bh=OrwBXhqoOizQ+wONE2bdkhyBN1GbfvyZgWPhawuBarg=; b=NqChDGbhpWT7C+UTXXdDLBbn1kFiHfpOJfK8Jm9LP6c6l1cGlikRYzErm7iBHT49UA 4ORF+0uJSXFQaLQyCecX7yoRpcfchQdcMdGwr9/02x4V685riX4V/ikSldF39/QDQumC mDO5amhOYf7t6T4LUUr+XSKRN0hg/KLG+G+VtHTyYQZ6XDA52XnKXiOdJzxs6db5XIOU W9w3kCP2sOvUIJWiB2aVq2Nrf1yrQSTUJ1DpkIBjoebBP+m/Etnec0BGFHvYhgGRwjN3 1bfHse9TEvfgghtApvLf1aoXIjeqWrosOOzZV0QsWpdDgl9dNH5Vr8eJjViAXLVBGQwG PGqQ== X-Received: by 10.194.235.169 with SMTP id un9mr5622317wjc.1.1366551751658; Sun, 21 Apr 2013 06:42:31 -0700 (PDT) Received: from camionet.local (shm67-5-88-165-90-188.fbx.proxad.net. [88.165.90.188]) by mx.google.com with ESMTPSA id ek4sm14252143wib.11.2013.04.21.06.42.29 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sun, 21 Apr 2013 06:42:30 -0700 (PDT) Message-ID: <5173ECC7.7020909@jitsi.org> Date: Sun, 21 Apr 2013 15:42:31 +0200 From: Emil Ivov Organization: Jitsi User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb issue tracker References: <066.4c5db43349d3176acaa90d17617a02d6@trac.tools.ietf.org> In-Reply-To: <066.4c5db43349d3176acaa90d17617a02d6@trac.tools.ietf.org> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Gm-Message-State: ALoCoQlljVbxdHdx9FkRGL/3nHNC0D/JWyYV1ooWifxMovquWt1Jkyhn6dl9gPnSflWonEZD28CI Cc: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, rtcweb@ietf.org Subject: Re: [rtcweb] #15: Section 4.8: SSRC signaling X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 21 Apr 2013 13:42:33 -0000 Hey all, On 20.04.13, 03:19, rtcweb issue tracker wrote: > #15: Section 4.8: SSRC signaling > > 4.8. Choice of RTP Synchronisation Source (SSRC) > > Implementations are REQUIRED to support signalled RTP SSRC values, > using the "a=ssrc:" SDP attribute defined in Sections 4.1 and 5 of > [RFC5576], and MUST also support the "previous-ssrc" source attribute > defined in Section 6.2 of [RFC5576]. Other attributes defined in > [RFC5576] MAY be supported. > > Use of the "a=ssrc:" attribute is OPTIONAL. Implementations MUST > support random SSRC assignment, and MUST support SSRC collision > detection and resolution, both according to [RFC3550]. > > [BA] I think you need to be more specific here. Does this mean that an > implementation needs to be able to render an SSRC that isn't declared in > an a=ssrc: attribute? Personally, I'd suggest that this is useful because > WebRTC gateways may not know what SSRCs to expect so they can't signal > them. Also, it enables operation in RTP topologies (like an RTP > translator). However, keep in mind that implicit SSRCs aren't something > the current WEBRTC API supports. I'd like to second this. Pre-announcing SSRC-s, which seems to be required by current implementations (e.g. Chrome wouldn't show video for unknown SSRCs) puts a huge constraint on existing implementations. This applies to simple clients that may not have the API to retrieve this information from their RTP components, but even more to gateways and RTP translators. Allowing the JS application to provide mappings between media streams and unknown SSRCs would probably resolve this issue. The application can then choose whether to do this mapping on local information or through the use of other signalling methods such as RFC 4575. Cheers, Emil -- https://jitsi.org From matthew@matthew.at Sun Apr 21 22:21:24 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7D9BA21F85D6 for ; Sun, 21 Apr 2013 22:21:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.43 X-Spam-Level: X-Spam-Status: No, score=-1.43 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_AT=0.424, HOST_EQ_AT=0.745] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id VmDRUixVReoW for ; Sun, 21 Apr 2013 22:21:24 -0700 (PDT) Received: from where.matthew.at (where.matthew.at [198.202.199.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1141B21F85BF for ; Sun, 21 Apr 2013 22:21:23 -0700 (PDT) Received: from [10.10.155.2] (unknown [10.10.155.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by where.matthew.at (Postfix) with ESMTP id B9B45230005 for ; Sun, 21 Apr 2013 22:21:21 -0700 (PDT) Message-ID: <5174C8D2.40504@matthew.at> Date: Sun, 21 Apr 2013 22:21:22 -0700 From: Matthew Kaufman User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> In-Reply-To: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Apr 2013 05:21:24 -0000 On 4/11/2013 4:04 PM, rtcweb issue tracker wrote: > #13: Transport of DATA_CHANNEL_OPEN > > Comment on draft-jesup-rtcweb-data-protocol: > > All DATA_CHANNEL_OPEN messages MUST be sent reliably and in-order. > > Ok, I've read the document and the whole discussion. Why do we need DATA_CHANNEL_OPEN messages? I can't understand the value of any of the things in there except possibly the "Label" field, which is allowed to be empty anyway(?) Matthew Kaufman From magnus.westerlund@ericsson.com Mon Apr 22 06:41:26 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EEE6421F8F12 for ; Mon, 22 Apr 2013 06:41:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.101 X-Spam-Level: X-Spam-Status: No, score=-106.101 tagged_above=-999 required=5 tests=[AWL=0.148, BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yjI4Pmx29fU1 for ; Mon, 22 Apr 2013 06:41:25 -0700 (PDT) Received: from mailgw7.ericsson.se (mailgw7.ericsson.se [193.180.251.48]) by ietfa.amsl.com (Postfix) with ESMTP id 497CF21F8D92 for ; Mon, 22 Apr 2013 06:41:25 -0700 (PDT) X-AuditID: c1b4fb30-b7f266d000000cb5-8b-51753e04a8a7 Received: from esessmw0256.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw7.ericsson.se (Symantec Mail Security) with SMTP id 4D.C2.03253.40E35715; Mon, 22 Apr 2013 15:41:24 +0200 (CEST) Received: from [127.0.0.1] (153.88.115.8) by esessmw0256.eemea.ericsson.se (153.88.115.97) with Microsoft SMTP Server id 8.3.279.1; Mon, 22 Apr 2013 15:41:23 +0200 Message-ID: <51753E02.6030901@ericsson.com> Date: Mon, 22 Apr 2013 15:41:22 +0200 From: Magnus Westerlund User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: Bernard Aboba References: <517148E0.7080206@ericsson.com> In-Reply-To: X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupjluLIzCtJLcpLzFFi42KZGfG3VpfFrjTQ4Pk8EYv9Sy4zW6z9187u wOTxuOcMm8eSJT+ZApiiuGxSUnMyy1KL9O0SuDJuTn3DWnBXtuL10ooGxm6JLkZODgkBE4nG 7resELaYxIV769m6GLk4hAROMUq8/LYQylnOKHFr+zoWkCpeAW2JrUvXMYLYLAKqEmsXbwWL swlYSNz80QjUwMEhKhAssbU1BqJcUOLkzCcsIGERAV2Jv11GIGFmAXWJO4vPsYPYwgI+ErO+ nQGzhQQiJZ72PmADsTkFrCQWdcxlgbhNUmLLi3Z2iF49iSlXWxghbHmJ5q2zmSF6tSUamjpY JzAKzUKyeRaSlllIWhYwMq9iZM9NzMxJLzffxAgM04NbfhvsYNx0X+wQozQHi5I4b7jrhQAh gfTEktTs1NSC1KL4otKc1OJDjEwcnFINjGf5jZ3tXybaFn21zLro+NE3tPvCjW0ad/wfXjtr 3Hdtjoza6gU2Tm6nU5S3LGI/sm+f0Nfkg6fF6gNZp5vr/LwXvvpv9v0KlYZw0dZznF/eR9/L vfvsRN1n4Q+tugwvDSNeiDs/aOjPmTbr0OoTmcIiGyeKOC08amuoaD11s6duVs0eh7YvX5VY ijMSDbWYi4oTAcQQ7oMhAgAA Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] RTP Usage: Reducing dependency on codec specifications X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Apr 2013 13:41:27 -0000 On 2013-04-20 02:42, Bernard Aboba wrote: > Magnus said: > >> The latest version of the RTP usage for WebRTC says: >> >> 4.3. Choice of RTP Payload Formats >> >> Implementations MUST follow the WebRTC Audio Codec and Processing >> Requirements [I-D.ietf-rtcweb-audio] and SHOULD follow the updated >> recommendations for audio codecs in the RTP/AVP Profile >> [I-D.ietf-avtcore-avp-codecs]. Support for other audio codecs is >> OPTIONAL. >> >> (tbd: the mandatory to implement video codec is not yet decided) >> >> From this I would like to make two observations. >> >> The first that the audio codecs draft should actually include the RTP >> payload format specification for the codecs it specifies to support. I >> strongly think this is the right place because if one later changes the >> codec requirements then one only need to update the audio specification >> rather than also RTP usage. > > [BA] I agree with this. > >> Secondly, that it might be best remove strong normative dependencies on >> the codec specifications in the RTP usage. We can clearly include >> informative references saying that the codec specification for WebRTC >> will specify the RTP payload formats to use. This also reduced cross >> referencing and dependencies between these specifications. Thus allowing >> us to move forward with the RTP usage independent on any continued video >> or audio codec discussions that may occur in the WG. >> >> >> Thoughts about this? >> >> I intended to suggest some text for the audio codec draft to improve its >> specification of the RTP payload formats related to the codecs. > > [BA] While I think this makes sense and I sympathize with the goal, in > practice truly making the RTP usage doc codec-independent could turn out > to be more difficult than it first appears. One thing I have been > noticing is that the approach to congestion control as well as loss > recovery strategies (e.g. retransmission vs. FEC, adapting > resolution/framerate via SDP vs. RTCP, use of AVPF feedback messages, > etc.) may differ markedly between implementations of VP8 and H.264. I don't think this is primary difference between VP8 and H.264, I think it is a highly a question of usage and implementation. Yes, there are some things that might be more or less usable with a particular codec, but can you point to any mechanism that is usable by one video codec that isn't usable by another one? I at least don't intended to make this media type independent when necessary to make it clear what tools are suitable for which media type. > This raises the nasty possibility that even if the MTI codec > disagreements were to be resolved (or if browsers were to support codec > extensibility) that we'd still be with saddled with persistent video > interoperability problems. > When it comes to interoperability I think my main concern is that WebRTC implementations select different strategies and lock down so hard towards their own strategy that the can't handle interoperating with a peer implementation that has a different strategy. Do you have specific issues that we could try to improve by being clear on how they expected to work or make clear that one needs to handle several different types of behaviors in regards to these? Cheers Magnus Westerlund ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- From magnus.westerlund@ericsson.com Mon Apr 22 06:50:43 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 636BA21F9057 for ; Mon, 22 Apr 2013 06:50:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.116 X-Spam-Level: X-Spam-Status: No, score=-106.116 tagged_above=-999 required=5 tests=[AWL=0.133, BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0tZwsJW41RJl for ; Mon, 22 Apr 2013 06:50:42 -0700 (PDT) Received: from mailgw2.ericsson.se (mailgw2.ericsson.se [193.180.251.37]) by ietfa.amsl.com (Postfix) with ESMTP id 2742B21F905B for ; Mon, 22 Apr 2013 06:50:38 -0700 (PDT) X-AuditID: c1b4fb25-b7f366d000004d10-22-5175402e2a3b Received: from esessmw0197.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw2.ericsson.se (Symantec Mail Security) with SMTP id E3.1D.19728.E2045715; Mon, 22 Apr 2013 15:50:38 +0200 (CEST) Received: from [127.0.0.1] (153.88.115.8) by esessmw0197.eemea.ericsson.se (153.88.115.88) with Microsoft SMTP Server id 8.3.279.1; Mon, 22 Apr 2013 15:50:38 +0200 Message-ID: <5175402D.3040204@ericsson.com> Date: Mon, 22 Apr 2013 15:50:37 +0200 From: Magnus Westerlund User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: Bernard Aboba References: In-Reply-To: X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupnluLIzCtJLcpLzFFi42KZGfG3VlfPoTTQ4NFPYYv9Sy4zW6z9187u wOTxuOcMm8eSJT+ZApiiuGxSUnMyy1KL9O0SuDIm7lnLWHBGsKJ7x23mBsZVfF2MnBwSAiYS Z868Z4ewxSQu3FvP1sXIxSEkcIpR4sL6+SwQznJGickb2hlBqngFtCUeHdzLBGKzCKhKrH9x hBnEZhOwkLj5oxGom4NDVCBYYmtrDES5oMTJmU9YQMIiAroSf7uMQMLMAuoSdxafA9srLOAn sfT5VDBbSMBSYt3DFrCJnAJWEvcuNLNA3CYpseVFOztEr57ElKstjBC2vETz1tnMEL3aEg1N HawTGIVmIdk8C0nLLCQtCxiZVzGy5yZm5qSXG21iBAbqwS2/VXcw3jkncohRmoNFSZw33PVC gJBAemJJanZqakFqUXxRaU5q8SFGJg5OqQbGSZ5NvUslLjk4nFSVn6eafluW+258B0vZjI9f CoU3PN7SJMGzKtGxtU8h/WHAwiLZX0Vb+ico8YsJLPmRIPrbwzj1nzqz3olFspoKfJdmbNNP Py716g7bRqnutA/2x7V+nz0paLBEONeUe8uL+55bep55+L92+i4h8YD1ndTEf5NcH18zV52q xFKckWioxVxUnAgAzc7AbCICAAA= Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] More elbow grease on draft-ietf-rtcweb-rtp-usage, please X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Apr 2013 13:50:43 -0000 Thanks, We definitely needs review of the draft. And we are just getting going on a doing a revision that tries to reduce the list of open issues significantly. So getting input on the issues and flagging new issues is highly appreciated. On 2013-04-20 04:02, Bernard Aboba wrote: > I just re-read draft-ietf-rtcweb-rtp-usage-06. Unfortunately there are > enough open issues left in this document to drive a convoy of trucks > through, and a number of those issues have been open for *years* (e.g. > some of these relate to problems that were recognized years before > WebRTC came on the scene, but are still open, like simulcast/layered > coding). Yes, there are some issue especially related to more advanced functions around multi-stream transmission and layered coding where we don't yet have finished specifications to reference yet. I agree that these have been known for quite a long time. But from my perspective, the market hasn't been desiring standardization of these functionalities, everyone has been happy to have their own private silo of functionality where things function by convention, rather than specification. I have been actively working to get going on resolving these things for quite some time. > > Depressing to realize that even if the MTI video codec issues were to be > resolved, we might *still* have interop headaches, but that's where I > think we are. >From my perspective functionality that isn't mature enough will have to be thrown out. I fear that will include some of my darlings. But that is the reality of umbrella standardization is that you have to work with what you have. For things that aren't ready enough to wait for, then you publish and revisit later and see if they can be added. Cheers Magnus Westerlund ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- From magnus.westerlund@ericsson.com Mon Apr 22 07:04:23 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 977E921F8916 for ; Mon, 22 Apr 2013 07:04:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -105.828 X-Spam-Level: X-Spam-Status: No, score=-105.828 tagged_above=-999 required=5 tests=[AWL=-0.179, BAYES_00=-2.599, HELO_EQ_SE=0.35, J_CHICKENPOX_14=0.6, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qzI2HDHMJuHf for ; Mon, 22 Apr 2013 07:04:23 -0700 (PDT) Received: from mailgw2.ericsson.se (mailgw2.ericsson.se [193.180.251.37]) by ietfa.amsl.com (Postfix) with ESMTP id 5AE8121F8681 for ; Mon, 22 Apr 2013 07:04:22 -0700 (PDT) X-AuditID: c1b4fb25-b7f366d000004d10-97-51754364e98d Received: from esessmw0184.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw2.ericsson.se (Symantec Mail Security) with SMTP id 7A.7F.19728.46345715; Mon, 22 Apr 2013 16:04:20 +0200 (CEST) Received: from [127.0.0.1] (153.88.115.8) by esessmw0184.eemea.ericsson.se (153.88.115.82) with Microsoft SMTP Server id 8.3.279.1; Mon, 22 Apr 2013 16:04:20 +0200 Message-ID: <51754363.3090300@ericsson.com> Date: Mon, 22 Apr 2013 16:04:19 +0200 From: Magnus Westerlund User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: Emil Ivov References: <066.4c5db43349d3176acaa90d17617a02d6@trac.tools.ietf.org> <5173ECC7.7020909@jitsi.org> In-Reply-To: <5173ECC7.7020909@jitsi.org> X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrILMWRmVeSWpSXmKPExsUyM+JvrW6Kc2mgwaT/1hbzu1pZLdbsnMBi sfZfO7vF/Z3lDiweS5b8ZPL4/ybQ48vlz2weP/dsZg1gieKySUnNySxLLdK3S+DK2NH4nbng hEzFvkdiDYx/xboYOTkkBEwkJv2ZxAxhi0lcuLeerYuRi0NI4BSjROvabcwQznJGiauXb7OA VPEKaEvcbrwGZrMIqEqs7HwP1s0mYCFx80cjUDcHh6hAsMTW1hiIckGJkzOfgJWLCMhLdLct YgKxmQWqJD4tn8IIYgsLmEmc3LQIrEZIIFli14OrYDWcApoSW1+0skAcJymx5UU7O0SvnsSU qy2MELa8RPPW2cwQvdoSDU0drBMYhWYhWT0LScssJC0LGJlXMbLnJmbmpJcbbWIEBvPBLb9V dzDeOSdyiFGag0VJnDfc9UKAkEB6YklqdmpqQWpRfFFpTmrxIUYmDk6pBsaYaRWfqvLPSp0y DK5LtlG77CDMskBiQbmq+eGdn615+TzXdP2YqGGyYdqKhG0+HJOXf926d5uVu8Y3iydN805m dF0/ZMdcyrv10+dzc2SdvJcc64z6GcK897TpqrimzNpV21UUc+pzXi9f+t6dz+zC/ydC2jfu sSwSevb3xFq2Za9P/yvJSX6kxFKckWioxVxUnAgAmCKKPDQCAAA= Cc: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, rtcweb issue tracker , rtcweb@ietf.org Subject: Re: [rtcweb] #15: Section 4.8: SSRC signaling X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Apr 2013 14:04:23 -0000 On 2013-04-21 15:42, Emil Ivov wrote: > Hey all, > > On 20.04.13, 03:19, rtcweb issue tracker wrote: >> #15: Section 4.8: SSRC signaling >> >> 4.8. Choice of RTP Synchronisation Source (SSRC) >> >> Implementations are REQUIRED to support signalled RTP SSRC values, >> using the "a=ssrc:" SDP attribute defined in Sections 4.1 and 5 of >> [RFC5576], and MUST also support the "previous-ssrc" source attribute >> defined in Section 6.2 of [RFC5576]. Other attributes defined in >> [RFC5576] MAY be supported. >> >> Use of the "a=ssrc:" attribute is OPTIONAL. Implementations MUST >> support random SSRC assignment, and MUST support SSRC collision >> detection and resolution, both according to [RFC3550]. >> >> [BA] I think you need to be more specific here. Does this mean that an >> implementation needs to be able to render an SSRC that isn't declared in >> an a=ssrc: attribute? Personally, I'd suggest that this is useful because >> WebRTC gateways may not know what SSRCs to expect so they can't signal >> them. Also, it enables operation in RTP topologies (like an RTP >> translator). However, keep in mind that implicit SSRCs aren't something >> the current WEBRTC API supports. > > I'd like to second this. Pre-announcing SSRC-s, which seems to be > required by current implementations (e.g. Chrome wouldn't show video for > unknown SSRCs) puts a huge constraint on existing implementations. This > applies to simple clients that may not have the API to retrieve this > information from their RTP components, but even more to gateways and RTP > translators. > > Allowing the JS application to provide mappings between media streams > and unknown SSRCs would probably resolve this issue. The application can > then choose whether to do this mapping on local information or through > the use of other signalling methods such as RFC 4575. Yes, we will be more explicit that one MUST be able to handle unannounced SSRCs, this is the result of having this sentence: "Use of the "a=ssrc:" attribute is OPTIONAL." If it is optional to use then a receiver must be capable of dealing when they show up unannounced. What about: Use of the "a=ssrc:" attribute is OPTIONAL. The fact that a=ssrc is optional to use makes it MANDATORY to be able to receive and handle SSRCs that has not been explicitly signalled ahead of time. Implementations MUST support random SSRC assignment, and MUST support SSRC collision detection and resolution, both according to [RFC3550]. My personal cases for them to start showing up are when RTP retransmission or FEC is used with a separate SSRC. Mandating that these SSRC are signalled, despite being associated SSRCs, rather than primary media SSRCs. I thought there was discussion in W3C of handling primary media source related SSRCs that was unannounced in the API by defaulting them into MediaStreamTracks added to some "default" MediaStream, to be able to deal with a substantial amount of legacy cases where it is difficult or even impossible to learn the SSRC of the media streams for the peer prior to receiving the media. Cheers Magnus Westerlund ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- From magnus.westerlund@ericsson.com Mon Apr 22 07:12:18 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A86E721F91A2 for ; Mon, 22 Apr 2013 07:12:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.113 X-Spam-Level: X-Spam-Status: No, score=-106.113 tagged_above=-999 required=5 tests=[AWL=0.136, BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gL-pVFIx5C8K for ; Mon, 22 Apr 2013 07:12:17 -0700 (PDT) Received: from mailgw1.ericsson.se (mailgw1.ericsson.se [193.180.251.45]) by ietfa.amsl.com (Postfix) with ESMTP id 5C65E21F91A3 for ; Mon, 22 Apr 2013 07:12:17 -0700 (PDT) X-AuditID: c1b4fb2d-b7f316d0000028db-4d-51754540e827 Received: from esessmw0197.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw1.ericsson.se (Symantec Mail Security) with SMTP id FB.82.10459.04545715; Mon, 22 Apr 2013 16:12:16 +0200 (CEST) Received: from [127.0.0.1] (153.88.115.8) by esessmw0197.eemea.ericsson.se (153.88.115.88) with Microsoft SMTP Server id 8.3.279.1; Mon, 22 Apr 2013 16:12:16 +0200 Message-ID: <5175453F.7010904@ericsson.com> Date: Mon, 22 Apr 2013 16:12:15 +0200 From: Magnus Westerlund User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: Harald Alvestrand References: <517148E0.7080206@ericsson.com> <5172F83A.5030307@alvestrand.no> In-Reply-To: <5172F83A.5030307@alvestrand.no> X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupjluLIzCtJLcpLzFFi42KZGfG3VtfBtTTQYPotGYtjfV1sFmv/tbM7 MHlcmXCF1WPJkp9MAUxRXDYpqTmZZalF+nYJXBlvJ9UWNKpXzDt3nKmB8ZR8FyMnh4SAicS5 G6uZIWwxiQv31rN1MXJxCAmcYpSY2noZylnOKLHz+hSwKl4BbYnl29+zgNgsAqoSv+bcZQex 2QQsJG7+aARq4OAQFQiW2NoaA1EuKHFy5hOwchEBHYmH+xuYQGxmAWGJDRfbwOLCAj4Ss76d ARsjBGRfOPSGCWQMp4CuxM2/YRC3SUpsedHODtGqJzHlagsjhC0v0bx1NjNEq7ZEQ1MH6wRG oVlINs9C0jILScsCRuZVjOy5iZk56eWGmxiBYXpwy2/dHYynzokcYpTmYFES5w1zvRAgJJCe WJKanZpakFoUX1Sak1p8iJGJg1OqgTGu6NyjHla1+IYIxYQzMx3+fTqWb/+JzZI3Y9e7GyZV J6YZfw8NMvbzK9HSPvpQSDC6NDWOaZO+QJS+4cS/wVV9G/lqXAoqD126pGo9deKt6mSnCcI/ 9rtbirrolgavjWuezrdk3ZqzWgu7+S7bmf4vtVDXF1rrVFx9Nna9V8GhmDvPWiQNlFiKMxIN tZiLihMBtjaf2iECAAA= Cc: rtcweb@ietf.org Subject: Re: [rtcweb] RTP Usage: Reducing dependency on codec specifications X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Apr 2013 14:12:18 -0000 On 2013-04-20 22:19, Harald Alvestrand wrote: > I may be too simple-minded, but why isn't the correct reference to > codecs in "RTP usage" a simple note saying > > "Mandatory to implement codecs for RTCWEB are not specified in this memo." I would add to this with also making clear that their payload format also are not specified here. There reason to include a reference to the AVP profile is that people appear poorly aware that this contains recommendations. The reference to the WebRTC audio and corresponding video can clearly be handled by the Overview document. If others think making this as thin as possible I will remove these references. What I think is important, as it appears to be over and over questioned, is that WebRTC is capable of using any codec that has an RTP payload format and can be negotiated between the peers. At least there appear to be support for the notion that the codec documents should contain the RTP payload format specs for their specified codecs. This allows me to move ahead with suggestion for such text to audio. Cheers Magnus > > or even less than that: > > "" > > ? > > I simply don't see why it should need to be mentioned in this document. > > On 04/19/2013 03:38 PM, Magnus Westerlund wrote: >> WG, >> As Individual and Editor of the WG document: >> >> The latest version of the RTP usage for WebRTC says: >> >> 4.3. Choice of RTP Payload Formats >> >> Implementations MUST follow the WebRTC Audio Codec and Processing >> Requirements [I-D.ietf-rtcweb-audio] and SHOULD follow the updated >> recommendations for audio codecs in the RTP/AVP Profile >> [I-D.ietf-avtcore-avp-codecs]. Support for other audio codecs is >> OPTIONAL. >> >> (tbd: the mandatory to implement video codec is not yet decided) >> >> From this I would like to make two observations. >> >> The first that the audio codecs draft should actually include the RTP >> payload format specification for the codecs it specifies to support. I >> strongly think this is the right place because if one later changes the >> codec requirements then one only need to update the audio specification >> rather than also RTP usage. >> >> Secondly, that it might be best remove strong normative dependencies on >> the codec specifications in the RTP usage. We can clearly include >> informative references saying that the codec specification for WebRTC >> will specify the RTP payload formats to use. This also reduced cross >> referencing and dependencies between these specifications. Thus allowing >> us to move forward with the RTP usage independent on any continued video >> or audio codec discussions that may occur in the WG. >> >> I propose that we change the first paragraph and remove the open issue >> (tbd) listed after so the text instead reads: >> >> 4.3. Choice of RTP Payload Formats >> >> The RTP payload formats to support depends on the media codecs that an >> implementation supports for media transport in WebRTC. These includes >> any codec mandated by other WebRTC codec specifications, such as the >> audio codecs specified in WebRTC Audio Codec and Processing Requirements >> [I-D.ietf-rtcweb-audio], or recommended by the RTP profile in use, see >> Update to Recommended Codecs for the RTP Profile for Audio and Video >> Conferences with Minimal Control (RTP/AVP) >> [I-D.ietf-avtcore-avp-codecs]. Support of any additional codecs and >> their RTP payload formats is OPTIONAL. >> >> >> Thoughts about this? >> >> I intended to suggest some text for the audio codec draft to improve its >> specification of the RTP payload formats related to the codecs. >> >> Cheers >> >> Magnus Westerlund >> >> ---------------------------------------------------------------------- >> Multimedia Technologies, Ericsson Research EAB/TVM >> ---------------------------------------------------------------------- >> Ericsson AB | Phone +46 10 7148287 >> Färögatan 6 | Mobile +46 73 0949079 >> SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com >> ---------------------------------------------------------------------- >> >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > > -- Magnus Westerlund ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- From magnus.westerlund@ericsson.com Mon Apr 22 07:14:59 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1B73F21F8F5C for ; Mon, 22 Apr 2013 07:14:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.124 X-Spam-Level: X-Spam-Status: No, score=-106.124 tagged_above=-999 required=5 tests=[AWL=0.125, BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IR3sfp-ZPhKR for ; Mon, 22 Apr 2013 07:14:57 -0700 (PDT) Received: from mailgw7.ericsson.se (mailgw7.ericsson.se [193.180.251.48]) by ietfa.amsl.com (Postfix) with ESMTP id 3DFA721F8E49 for ; Mon, 22 Apr 2013 07:14:57 -0700 (PDT) X-AuditID: c1b4fb30-b7f266d000000cb5-ed-517545e0428d Received: from esessmw0247.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw7.ericsson.se (Symantec Mail Security) with SMTP id 94.98.03253.0E545715; Mon, 22 Apr 2013 16:14:56 +0200 (CEST) Received: from [127.0.0.1] (153.88.115.8) by esessmw0247.eemea.ericsson.se (153.88.115.94) with Microsoft SMTP Server id 8.3.279.1; Mon, 22 Apr 2013 16:14:55 +0200 Message-ID: <517545DE.5060208@ericsson.com> Date: Mon, 22 Apr 2013 16:14:54 +0200 From: Magnus Westerlund User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: Harald Alvestrand , Peter Thatcher References: <516328C9.7070506@jesup.org>, <516FBF34.1070500@ericsson.com> In-Reply-To: X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrOLMWRmVeSWpSXmKPExsUyM+Jvre4D19JAg1vHpS32L7nMbHHixmlm i2vLX7NanN2WZbH2Xzu7A6vHgk2lHo97zrB5LFnyk8njw/J1bAEsUVw2Kak5mWWpRfp2CVwZ a+88Zyt4zlOxu+cOcwPjWq4uRk4OCQETiQ8TJzNC2GISF+6tZ+ti5OIQEjjFKPFiyV4WkISQ wHJGia6NhSA2r4C2xJb29WBxFgFVian31oDZbAIWEjd/NAI1c3CICgRLbG2NgSgXlDg58wlY iYhAgMT9lQdZQWxmgXqJS3uuM4PYwgIOEs39Z9kh9r5klDj35RhYA6eAlcTpMzeYII6TlNjy op0dollPYsrVFkYIW16ieetsZog7tSUamjpYJzAKzUKyexaSlllIWhYwMq9iZM9NzMxJLzff xAgM7INbfhvsYNx0X+wQozQHi5I4b7jrhQAhgfTEktTs1NSC1KL4otKc1OJDjEwcnFINjJsX zU/lfvpfYZLx9Uy33GVr+15yety84GWvflr61k23FvGJb6ZNMf9RvqhE1tB2e9W6NJHGo66+ 9seKTFea7uuOWXK3NOyfQLvOoZv8mY2Fa7ZM3bRO7nWBCLdOhf9bwZ175z15wvNe5Iztny93 paWcE77FpiySt4i3qXaovdTruOlB0KeYfiWW4oxEQy3mouJEAJQCF7M6AgAA Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] Minutes for the Data Channel Presentations X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Apr 2013 14:14:59 -0000 Harald and Peter, Can you bring any clarity on what you supported? Cheers Magnus On 2013-04-20 03:04, Bernard Aboba wrote: > Magnus said: > >> I have now updated the minutes trying to clarify the context and the >> corrections. Please check if you think this makes it clearer. If not I >> am happy to introduce additional clarifications, but please be explicit >> about what should be changed. >> >> http://www.ietf.org/proceedings/86/minutes/minutes-86-rtcweb >> > > > Peter Thatcher commented that he thinks the presenter's proposal > (draft­jesup­rtcweb­data­protocol­04) is great. > > [BA] My impression was that this remark more related to the presentation > suggestions relating to removing of stream negotiation from SDP, which > isn't covered in draft-jesup-rtcweb-data-protocol-04. > > Harald Alvestrand stated that he Agree with this. Glad got data channel > negotiation out of the document. > > [BA] Since draft-jesup-rtcweb-data-protocol is about setting up data > channels this doesn't make sense to me. Was Harald perhaps referring to > getting data channel negotiation "out of SDP"? > > > > -- Magnus Westerlund ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- From martin.thomson@gmail.com Mon Apr 22 10:29:15 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A9D0521F854E for ; Mon, 22 Apr 2013 10:29:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id r6t9H7pLxqle for ; Mon, 22 Apr 2013 10:29:15 -0700 (PDT) Received: from mail-wi0-x22e.google.com (mail-wi0-x22e.google.com [IPv6:2a00:1450:400c:c05::22e]) by ietfa.amsl.com (Postfix) with ESMTP id EAB6D21F863B for ; Mon, 22 Apr 2013 10:29:14 -0700 (PDT) Received: by mail-wi0-f174.google.com with SMTP id m6so4851430wiv.1 for ; Mon, 22 Apr 2013 10:29:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=Zcm5xygYlDkTJW2ZeVhRKEed98S6Bqw3WrGFQSAaTR0=; b=AS9BLDSOJIOdQi8Nd4FBLDEx6CaVueSKOGrsfmWGLJW3aAo23hpmL/JiKl3F1wTObZ J38AOL9mVPayF3Ez3sZloHTcGr3JkDMxCbol1WbMUz+UYAS5yG4tyaEzo4Km+4/OagzX wexXBklVA1o0xNgPxKxXgV/hiQJqdxpr8BWt24Kn5Q52A6ixeUchB2H7ZwSTSu77AmoJ jXcbyGEuz7pd4HpehJaugd5lGzjSaEEbMTX6g7ta5xLm6cvV08xrmwPoeUHlmV8ptN3i 3uVC0dylvWF7K8VMgKel89Wys312T/+9lnMMzNF52uKExvLP2Hx6oZxY5JYgvX+GFiq5 aKuw== MIME-Version: 1.0 X-Received: by 10.194.235.196 with SMTP id uo4mr54530395wjc.30.1366651754119; Mon, 22 Apr 2013 10:29:14 -0700 (PDT) Received: by 10.194.33.102 with HTTP; Mon, 22 Apr 2013 10:29:14 -0700 (PDT) In-Reply-To: <51754363.3090300@ericsson.com> References: <066.4c5db43349d3176acaa90d17617a02d6@trac.tools.ietf.org> <5173ECC7.7020909@jitsi.org> <51754363.3090300@ericsson.com> Date: Mon, 22 Apr 2013 10:29:14 -0700 Message-ID: From: Martin Thomson To: Magnus Westerlund Content-Type: text/plain; charset=UTF-8 Cc: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, "rtcweb@ietf.org" , rtcweb issue tracker Subject: Re: [rtcweb] #15: Section 4.8: SSRC signaling X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Apr 2013 17:29:15 -0000 On 22 April 2013 07:04, Magnus Westerlund wrote: > Yes, we will be more explicit that one MUST be able to handle > unannounced SSRCs, this is the result of having this sentence: > "Use of the "a=ssrc:" attribute is OPTIONAL." If it is optional to use > then a receiver must be capable of dealing when they show up unannounced. That solves half the problem. I don't recall the discussion on the "default" MediaStream, but it's very similar to several other suggestions I've heard. Another one suggested was to provide unidentified single-track streams when unknown streams appear. I'm not sure how either option would migrate to identified and grouped streams. The basic problem is that you don't have an answer that provides you with the necessary information. Even if you could somehow associate an incoming packet with an m= line, you don't have any way to determine what identifier the remote side attached to that stream. It's also unknown how that stream was grouped prior to being put on the network. This is somewhat important because we expect it to happen in a lot of cases. We designed an "unexpected SSRC" event in CU-RTC-Web, which fixes the problem in a different way. That is, make it somebody else's problem. From emil@sip-communicator.org Mon Apr 22 12:25:28 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8C5FF21E809A for ; Mon, 22 Apr 2013 12:25:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rW0v4cVSOtav for ; Mon, 22 Apr 2013 12:25:27 -0700 (PDT) Received: from mail-we0-x234.google.com (mail-we0-x234.google.com [IPv6:2a00:1450:400c:c03::234]) by ietfa.amsl.com (Postfix) with ESMTP id 88CF121F9193 for ; Mon, 22 Apr 2013 12:25:26 -0700 (PDT) Received: by mail-we0-f180.google.com with SMTP id x43so2667731wey.11 for ; Mon, 22 Apr 2013 12:25:24 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:message-id:date:from:organization:user-agent :mime-version:to:cc:subject:references:in-reply-to:content-type :content-transfer-encoding:x-gm-message-state; bh=lKxG3yTe/gCeMwm6tkuzehORB8U3N/FI/l8O8TomJMo=; b=jw/DRir+1tl5OLJX2V7slF3E3X2Vq8XNvKU0ElCM6XAhFX5cMLXiDEvaTDmZZDQHOV 03BX99u5K6gTtXzT9pZbBlmC8RUW2ulOxOQayn1L7r4UHhWtoz3EZegT0BRkICB0H2T0 HsadfddQfAgMkbtmUkHw7k+qcpT+82YeLbODemNf7c+ueikSeD5SBnWoc8LrvA9QK7A2 vv3+ItUxgxRzlcgkU3FJGQbVY8GC3pkLqiV833SoY8jjPv388kAwDKZ83p4km3ogZIoc +YX4zufYSeNTz9Dn7C0vJvNmfRHp2toOvPkAAzwR2nmsvYiEitRcITc6L8ziHviev49P 5g8g== X-Received: by 10.180.13.179 with SMTP id i19mr11522174wic.18.1366658724656; Mon, 22 Apr 2013 12:25:24 -0700 (PDT) Received: from camionet.local ([2a01:e35:8a55:abc0:f9a2:880:ce04:7cbc]) by mx.google.com with ESMTPS id k5sm24131647wiy.5.2013.04.22.12.25.22 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 22 Apr 2013 12:25:23 -0700 (PDT) Message-ID: <51758EA1.7010707@jitsi.org> Date: Mon, 22 Apr 2013 21:25:21 +0200 From: Emil Ivov Organization: Jitsi User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: Martin Thomson References: <066.4c5db43349d3176acaa90d17617a02d6@trac.tools.ietf.org> <5173ECC7.7020909@jitsi.org> <51754363.3090300@ericsson.com> In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Gm-Message-State: ALoCoQlKpiK9cn3lWG2J5af2DvKcrTR5/h6z48AzevPtDtStt6N85Jhvw04j7x4FNMJPSqJ4jApw Cc: draft-ietf-rtcweb-rtp-usage@tools.ietf.org, rtcweb issue tracker , "rtcweb@ietf.org" Subject: Re: [rtcweb] #15: Section 4.8: SSRC signaling X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Apr 2013 19:25:28 -0000 On 22.04.13, 19:29, Martin Thomson wrote: > On 22 April 2013 07:04, Magnus Westerlund > wrote: >> Yes, we will be more explicit that one MUST be able to handle >> unannounced SSRCs, this is the result of having this sentence: >> "Use of the "a=ssrc:" attribute is OPTIONAL." If it is optional to use >> then a receiver must be capable of dealing when they show up unannounced. > > That solves half the problem. > > I don't recall the discussion on the "default" MediaStream, but it's > very similar to several other suggestions I've heard. Another one > suggested was to provide unidentified single-track streams when > unknown streams appear. I'm not sure how either option would migrate > to identified and grouped streams. > > The basic problem is that you don't have an answer that provides you > with the necessary information. Even if you could somehow associate > an incoming packet with an m= line, you don't have any way to > determine what identifier the remote side attached to that stream. > It's also unknown how that stream was grouped prior to being put on > the network. This is somewhat important because we expect it to > happen in a lot of cases. > > We designed an "unexpected SSRC" event in CU-RTC-Web, which fixes the > problem in a different way. That is, make it somebody else's problem. This would make a lot of sense, and as I already pointed out, exsiting non-sdp/non-OA mechanisms can be used for this (e.g. RFC4575 or XEP-0298) That said, even a "default" media stream would be better than simply ignoring unannounced SSRCs, which is what happens with current implementations. Cheers, Emil -- https://jitsi.org From worley@shell01.TheWorld.com Mon Apr 22 15:16:03 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B6D1311E80D9 for ; Mon, 22 Apr 2013 15:16:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.98 X-Spam-Level: X-Spam-Status: No, score=-2.98 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1, RCVD_IN_SORBS_WEB=0.619] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 16AnP87mmPJN for ; Mon, 22 Apr 2013 15:16:03 -0700 (PDT) Received: from TheWorld.com (pcls6.std.com [192.74.137.146]) by ietfa.amsl.com (Postfix) with ESMTP id F414611E80D3 for ; Mon, 22 Apr 2013 15:16:02 -0700 (PDT) Received: from shell.TheWorld.com (root@shell01.theworld.com [192.74.137.71]) by TheWorld.com (8.14.5/8.14.5) with ESMTP id r3MMFr9S030160; Mon, 22 Apr 2013 18:15:55 -0400 Received: from shell01.TheWorld.com (localhost.theworld.com [127.0.0.1]) by shell.TheWorld.com (8.13.6/8.12.8) with ESMTP id r3MMFrWH3207135; Mon, 22 Apr 2013 18:15:53 -0400 (EDT) Received: (from worley@localhost) by shell01.TheWorld.com (8.13.6/8.13.6/Submit) id r3MMFqsE3199256; Mon, 22 Apr 2013 18:15:52 -0400 (EDT) Date: Mon, 22 Apr 2013 18:15:52 -0400 (EDT) Message-Id: <201304222215.r3MMFqsE3199256@shell01.TheWorld.com> From: worley@ariadne.com (Dale R. Worley) Sender: worley@ariadne.com (Dale R. Worley) To: Martin Thomson In-reply-to: (martin.thomson@gmail.com) References: <066.4c5db43349d3176acaa90d17617a02d6@trac.tools.ietf.org> <5173ECC7.7020909@jitsi.org> <51754363.3090300@ericsson.com> Cc: rtcweb@ietf.org Subject: Re: [rtcweb] #15: Section 4.8: SSRC signaling X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Apr 2013 22:16:03 -0000 > From: Martin Thomson > > On 22 April 2013 07:04, Magnus Westerlund > wrote: > > Yes, we will be more explicit that one MUST be able to handle > > unannounced SSRCs, this is the result of having this sentence: > > "Use of the "a=ssrc:" attribute is OPTIONAL." If it is optional to use > > then a receiver must be capable of dealing when they show up unannounced. > The basic problem is that you don't have an answer that provides you > with the necessary information. Even if you could somehow associate > an incoming packet with an m= line, [...] My understanding is that associating an incoming RTP packet with an m= line is a solved problem -- the transport association on which the packet arrives determines the bundle, and (within all of the currently active bundling proposals) the payload type tells which m= line within the bundle. > [...] you don't have any way to > determine what identifier the remote side attached to that stream. > It's also unknown how that stream was grouped prior to being put on > the network. This is somewhat important because we expect it to > happen in a lot of cases. However, I believe you are correct that knowing which m= line contains the SSRC does not tell the RtcWeb stream identification. Dale From hta@google.com Mon Apr 22 15:23:06 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9922221E8088 for ; Mon, 22 Apr 2013 15:23:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.976 X-Spam-Level: X-Spam-Status: No, score=-102.976 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3V13VG7rG5-p for ; Mon, 22 Apr 2013 15:23:02 -0700 (PDT) Received: from mail-qe0-f49.google.com (mail-qe0-f49.google.com [209.85.128.49]) by ietfa.amsl.com (Postfix) with ESMTP id 65AF421E80A3 for ; Mon, 22 Apr 2013 15:22:37 -0700 (PDT) Received: by mail-qe0-f49.google.com with SMTP id 6so4424698qeb.8 for ; Mon, 22 Apr 2013 15:22:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=lcwAkrqtqvt5KjbTxeLz78BnquQZHYavT/806chrhBo=; b=oWIFodhwSV/eiNBhz1jb7yPWwhlfvL+jX5i0ap1pbxlXj73XcFEUD5gc24vw13vGa7 uwC5UoaxTXdmMl8LWzBLg79K6et+qlEGVguFw6uHYcMM4Prc+AqBbaxLFuQWIuYMcju2 gXEn7o2KxfmdM3IX/x505lyxqmRPFqZJJiWb4pVGMY29xvAG36tS+aidmxPf9T7/OReg yufJu6au+MiCJssv4IOb+3yGjfX3ZuROvk4EU6Ff/3T3eUb/+Wd6Hf9bdJfvKdKn2cKe bTOzlKthbT2/glX0g/KK7OdH37MjTd+hb7m5TnUdXjY1MveyCK+TlNJI2fApT8hM0h6M srBQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:x-gm-message-state; bh=lcwAkrqtqvt5KjbTxeLz78BnquQZHYavT/806chrhBo=; b=h8O3Yvgm0y+zRrgqVdftvwM6PBYZt7LcXyaXQn4GH8TsMupoVUdbFIPhKc9PQ46FLQ 3woYdpsm7dYoXV49tovydZJfZzwZZMLAvWEIXDri57han06k6Z9G4nC1My6VO+d9rcnn 06XguyVGURZ2bNzISu0mmOEs7u8aglwTUpn06ZPkKW1eaYpm8dScJeO8kHvTxXILdUVo g2K9VFNIm9I00WBSvu6muRLdQsWy0/Huy++8pJUNhMZZitEBJhcDktarh6YoItde1Znv wRKXg8jgNxPRh/8dxwwQ51b/WLaMnNQ852ou2hQzoIx3hFE25xn8/kkfYX9LImDWORFA ACgw== X-Received: by 10.224.39.146 with SMTP id g18mr24220981qae.31.1366669355814; Mon, 22 Apr 2013 15:22:35 -0700 (PDT) MIME-Version: 1.0 Received: by 10.229.125.215 with HTTP; Mon, 22 Apr 2013 15:22:14 -0700 (PDT) In-Reply-To: <517545DE.5060208@ericsson.com> References: <516328C9.7070506@jesup.org> <516FBF34.1070500@ericsson.com> <517545DE.5060208@ericsson.com> From: Harald Alvestrand Date: Tue, 23 Apr 2013 00:22:14 +0200 Message-ID: To: Magnus Westerlund Content-Type: multipart/alternative; boundary=20cf306f74cc7aa82104dafa813d X-Gm-Message-State: ALoCoQn7dLy97UylkiMT2LVk7Wrxp4r2y7J8gzKq8k7m3LmByzocn/nPuzYOskEK6p4eisM3Emc+A31E8iSEEQz97F09RWaQY0B3wdG1oqYEPCOn9IKqrCbtOoXlRufWeyhkIMl0fcF9jkB8zhz3Y0Wmt8hmYO8wnrraoo+yNnfxhtxQHIbkhiJS4xI7bzQI3kBIXO5kWaUp Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] Minutes for the Data Channel Presentations X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Apr 2013 22:23:06 -0000 --20cf306f74cc7aa82104dafa813d Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable It clearly wasn't clear to Bernard either :-) I supported what draft-jesup was suggesting - negotiating usage of SCTP in SDP, and not mentioning individual data channels in the SDP. On Mon, Apr 22, 2013 at 4:14 PM, Magnus Westerlund < magnus.westerlund@ericsson.com> wrote: > Harald and Peter, > > Can you bring any clarity on what you supported? > > Cheers > > Magnus > > On 2013-04-20 03:04, Bernard Aboba wrote: > > Magnus said: > > > >> I have now updated the minutes trying to clarify the context and the > >> corrections. Please check if you think this makes it clearer. If not I > >> am happy to introduce additional clarifications, but please be explici= t > >> about what should be changed. > >> > >> http://www.ietf.org/proceedings/86/minutes/minutes-86-rtcweb > >> > > > > > > Peter Thatcher commented that he thinks the presenter's proposal > > (draft=C2=ADjesup=C2=ADrtcweb=C2=ADdata=C2=ADprotocol=C2=AD04) is grea= t. > > > > [BA] My impression was that this remark more related to the presentatio= n > > suggestions relating to removing of stream negotiation from SDP, which > > isn't covered in draft-jesup-rtcweb-data-protocol-04. > > > > Harald Alvestrand stated that he Agree with this. Glad got data channel > > negotiation out of the document. > > > > [BA] Since draft-jesup-rtcweb-data-protocol is about setting up data > > channels this doesn't make sense to me. Was Harald perhaps referring t= o > > getting data channel negotiation "out of SDP"? > > > > > > > > > > > -- > > Magnus Westerlund > > ---------------------------------------------------------------------- > Multimedia Technologies, Ericsson Research EAB/TVM > ---------------------------------------------------------------------- > Ericsson AB | Phone +46 10 7148287 > F=C3=A4r=C3=B6gatan 6 | Mobile +46 73 0949079 > SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com > ---------------------------------------------------------------------- > > --20cf306f74cc7aa82104dafa813d Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
It clearly wasn't clear to Bernard either :-)

=
I supported what draft-jesup was suggesting - negotiating usage = of SCTP in SDP, and not mentioning individual data channels in the SDP.



On Mon, Apr 22, 2013 at 4:14 PM, Magnus Westerlund <m= agnus.westerlund@ericsson.com> wrote:
Harald and Peter,

Can you bring any clarity on what you supported?

Cheers

Magnus

On 2013-04-20 03:04, Bernard Aboba wrote:
> Magnus said:
>
>> I have now updated the minutes trying to clarify the context and t= he
>> corrections. Please check if you think this makes it clearer. If n= ot I
>> am happy to introduce additional clarifications, but please be exp= licit
>> about what should be changed.
>>
>> http://www.ietf.org/proceedings/86/minutes/minutes= -86-rtcweb
>>
>
>
> Peter Thatcher commented that he thinks the presenter's proposal > (draft=C2=ADjesup=C2=ADrtcweb=C2=ADdata=C2=ADprotocol=C2=AD04) =C2=A0i= s great.
>
> [BA] My impression was that this remark more related to the presentati= on
> suggestions relating to removing of stream negotiation from SDP, which=
> isn't covered in draft-jesup-rtcweb-data-protocol-04.
>
> Harald Alvestrand stated that he Agree with this. Glad got data channe= l
> negotiation out of the document.
>
> [BA] =C2=A0Since draft-jesup-rtcweb-data-protocol is about setting up = data
> channels this doesn't make sense to me. =C2=A0Was Harald perhaps r= eferring to
> getting data channel negotiation "out of SDP"?
>
>
>
>


--

Magnus Westerlund

----------------------------------------------------------------------
Multimedia Technologies, Ericsson Research EAB/TVM
----------------------------------------------------------------------
Ericsson AB =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| Phone = =C2=A0+46 10 71= 48287
F=C3=A4r=C3=B6gatan 6 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0| Mobile +46= 73 0949079
SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com
----------------------------------------------------------------------


--20cf306f74cc7aa82104dafa813d-- From martin.thomson@gmail.com Mon Apr 22 15:55:38 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CD29D11E80BA for ; Mon, 22 Apr 2013 15:55:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SxxXLkc1Od-u for ; Mon, 22 Apr 2013 15:55:25 -0700 (PDT) Received: from mail-wg0-x229.google.com (mail-wg0-x229.google.com [IPv6:2a00:1450:400c:c00::229]) by ietfa.amsl.com (Postfix) with ESMTP id 3288021E80C4 for ; Mon, 22 Apr 2013 15:55:10 -0700 (PDT) Received: by mail-wg0-f41.google.com with SMTP id e11so1269837wgh.2 for ; Mon, 22 Apr 2013 15:55:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=+O1g1b0WadDrdX4dFTYIJLs7Sy+yy2SbKQf6rgVUKPE=; b=FsL9N3BitOsweaZnSI/LGMfcrizwOqTpJ+O89lK00W2ODodMjJZf1H1S/tkC5pLoXQ sqfoq+ZekWDKWUEZkFe8xF8EBXXwBLtpW0EjrFCgJmtCTlUJNl1uj8kTGyoy2PqrKGW5 i3Ouly7yCDmVPMREL9DyBfWZ9s5suRba6EfFDJ6wQYSPJuyaI9I47PjTLbtNh+gYNrvQ Zit6Qjc18oWVT8lrVT0rk56+oXckx2VCcFx0lLpPi/YcfQN2ooUK0k18Gtz50vZQc8KE sdDqN9TFLqGfB5vjj2bne/G3DQ+VhWlBCHEBRavGPWr2BLO81R3tSfwKXZnix+yWZDZe aFiw== MIME-Version: 1.0 X-Received: by 10.194.109.227 with SMTP id hv3mr56847755wjb.32.1366671306294; Mon, 22 Apr 2013 15:55:06 -0700 (PDT) Received: by 10.194.33.102 with HTTP; Mon, 22 Apr 2013 15:55:06 -0700 (PDT) In-Reply-To: <201304222215.r3MMFqsE3199256@shell01.TheWorld.com> References: <066.4c5db43349d3176acaa90d17617a02d6@trac.tools.ietf.org> <5173ECC7.7020909@jitsi.org> <51754363.3090300@ericsson.com> <201304222215.r3MMFqsE3199256@shell01.TheWorld.com> Date: Mon, 22 Apr 2013 15:55:06 -0700 Message-ID: From: Martin Thomson To: "Dale R. Worley" Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #15: Section 4.8: SSRC signaling X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Apr 2013 22:55:38 -0000 On 22 April 2013 15:15, Dale R. Worley wrote: > My understanding is that associating an incoming RTP packet with an m= > line is a solved problem -- the transport association on which the > packet arrives determines the bundle, and (within all of the currently > active bundling proposals) the payload type tells which m= line within > the bundle. Not so. If you have five PTs on each m= line, and 30 m= lines, you just don't have that many PTs available. At some point you have to recognize that SSRC is what you have to use. (Neither number is extraordinary.) So, no, demux is a solved problem, but I don't believe that it's as simple as you describe. > However, I believe you are correct that knowing which m= line contains > the SSRC does not tell the RtcWeb stream identification. Exactly, you need to know how to label, identify and group the application layer construct that you create to represent the media. From bernard_aboba@hotmail.com Mon Apr 22 16:04:05 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7957021F859A for ; Mon, 22 Apr 2013 16:04:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.598 X-Spam-Level: X-Spam-Status: No, score=-102.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3shVPIXOva11 for ; Mon, 22 Apr 2013 16:04:02 -0700 (PDT) Received: from blu0-omc3-s26.blu0.hotmail.com (blu0-omc3-s26.blu0.hotmail.com [65.55.116.101]) by ietfa.amsl.com (Postfix) with ESMTP id 97B6011E80BA for ; Mon, 22 Apr 2013 16:04:02 -0700 (PDT) Received: from BLU169-W67 ([65.55.116.72]) by blu0-omc3-s26.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Mon, 22 Apr 2013 16:04:02 -0700 X-EIP: [kJFpOhhEJRD0EVFEfF4Ntqh+0dEkNY+c] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: multipart/alternative; boundary="_c3349aad-421d-4b91-8157-e280fa8f7a23_" From: Bernard Aboba To: "rtcweb@ietf.org" Date: Mon, 22 Apr 2013 16:04:01 -0700 Importance: Normal MIME-Version: 1.0 X-OriginalArrivalTime: 22 Apr 2013 23:04:02.0322 (UTC) FILETIME=[AE1AFF20:01CE3FAD] Subject: [rtcweb] RRe: More elbow grease on draft-ietf-rtcweb-rtp-usage, please X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Apr 2013 23:04:05 -0000 --_c3349aad-421d-4b91-8157-e280fa8f7a23_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Magnus said: Yes=2C there are some issue especially related to more advanced functions= =0A= around multi-stream transmission and layered coding where we don't yet=0A= have finished specifications to reference yet. I agree that these have=0A= been known for quite a long time. But from my perspective=2C the market=0A= hasn't been desiring standardization of these functionalities=2C everyone= =0A= has been happy to have their own private silo of functionality where=0A= things function by convention=2C rather than specification. I have been=0A= actively working to get going on resolving these things for quite some=0A= time. [BA] The "market desire" has been growing strongly=2C now that support for = simulcast and layered coding has become much more common. Interestingly=2C many of the i= mplementations have independently chosen to do things similarly (though not exactly the same wa= y)=2C indicating that there is a basis for agreement about how things should work. I am hop= ing that we will therefore see more progress=2C starting with the Berlin meeting.=20 Magnus said:=20 >From my perspective functionality that isn't mature enough will have to=0A= be thrown out. I fear that will include some of my darlings. But that is=0A= the reality of umbrella standardization is that you have to work with=0A= what you have. For things that aren't ready enough to wait for=2C then you= =0A= publish and revisit later and see if they can be added.=0A= [BA] If there is a clean way to separate "v1.0" functionality from addons= =2C that would be welcome. However=2C in the current RTP usage draft there are open issues t= hat relate to the interaction of feedback messages and congestion control=2C which seems like= a "v2.0"=20 feature (e.g. "v1.0" is circuit-breakers). Also=2C there is an interaction= between the=20 approach to resolution/frame rate change and support for simulcast/layered = coding (e.g.=20 simulcast/layered coding implementations typically change resolution/frame = rate without SDP=20 re-negotiation=2C since the sender or mixer can drop layers/change simulcas= t encodings).=20 = --_c3349aad-421d-4b91-8157-e280fa8f7a23_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Magnus said:

Yes=2C =
there are some issue especially related to more advanced functions=0A=
around multi-stream transmission and layered coding where we don't yet=0A=
have finished specifications to reference yet. I agree that these have=0A=
been known for quite a long time. But from my perspective=2C the market=0A=
hasn't been desiring standardization of these functionalities=2C everyone=
=0A=
has been happy to have their own private silo of functionality where=0A=
things function by convention=2C rather than specification. I have been=0A=
actively working to get going on resolving these things for quite some=0A=
time.

[BA] The "market desire" has been growing strongly=2C now that=
 support for simulcast and
layered coding has become much more common.  =
Interestingly=2C many of the implementations have
independently chosen t=
o do things similarly (though not exactly the same way)=2C indicating
th=
at there is a basis for agreement about how things should work.  I am hopin=
g that we will
therefore see more progress=2C starting with the Berlin m=
eeting. 


Magnus said: 

From my perspective functionality =
that isn't mature enough will have to=0A=
be thrown out. I fear that will include some of my darlings. But that is=0A=
the reality of umbrella standardization is that you have to work with=0A=
what you have. For things that aren't ready enough to wait for=2C then you=
=0A=
publish and revisit later and see if they can be added.=0A=

[BA] If there is a clean way to separate "v1.0" functionality from addo=
ns=2C that would be
welcome.  However=2C in the current RTP usage draft =
there are open issues that relate to the
interaction of feedback message=
s and congestion control=2C which seems like a "v2.0" 
feature (e.g. "v1=
.0" is circuit-breakers).  Also=2C there is an interaction between the 
=
approach to resolution/frame rate change and support for simulcast/layered =
coding (e.g. 
simulcast/layered coding implementations typically change =
resolution/frame rate without SDP 
re-negotiation=2C since the sender or=
 mixer can drop layers/change simulcast encodings).

=
= --_c3349aad-421d-4b91-8157-e280fa8f7a23_-- From bernard_aboba@hotmail.com Mon Apr 22 16:07:50 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CAD0621F93D3 for ; Mon, 22 Apr 2013 16:07:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.598 X-Spam-Level: X-Spam-Status: No, score=-102.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NSpPQdemsJjh for ; Mon, 22 Apr 2013 16:07:50 -0700 (PDT) Received: from blu0-omc3-s17.blu0.hotmail.com (blu0-omc3-s17.blu0.hotmail.com [65.55.116.92]) by ietfa.amsl.com (Postfix) with ESMTP id 269B721F93D0 for ; Mon, 22 Apr 2013 16:07:50 -0700 (PDT) Received: from BLU169-W19 ([65.55.116.72]) by blu0-omc3-s17.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Mon, 22 Apr 2013 16:07:49 -0700 X-EIP: [r/aVoMQ0pi38JbxtOhqMTJSbD2GcAMjB] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: multipart/alternative; boundary="_0c3ab81e-24b0-41b7-909b-8de3fe702faa_" From: Bernard Aboba To: "rtcweb@ietf.org" Date: Mon, 22 Apr 2013 16:07:49 -0700 Importance: Normal MIME-Version: 1.0 X-OriginalArrivalTime: 22 Apr 2013 23:07:49.0817 (UTC) FILETIME=[35B3FA90:01CE3FAE] Subject: [rtcweb] RRe: More elbow grease on draft-ietf-rtcweb-rtp-usage, please X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Apr 2013 23:07:50 -0000 --_0c3ab81e-24b0-41b7-909b-8de3fe702faa_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Magnus said: Yes=2C there are some issue especially related to more advanced functions= =0A= around multi-stream transmission and layered coding where we don't yet=0A= have finished specifications to reference yet. I agree that these have=0A= been known for quite a long time. But from my perspective=2C the market=0A= hasn't been desiring standardization of these functionalities=2C everyone= =0A= has been happy to have their own private silo of functionality where=0A= things function by convention=2C rather than specification. I have been=0A= actively working to get going on resolving these things for quite some=0A= time. [BA] The "market desire" has been growing strongly=2C now that support for = simulcast and layered coding has become much more common. Interestingly=2C many of the i= mplementations have independently chosen to do things similarly (though not exactly the same wa= y)=2C indicating that there is a basis for agreement about how things should work. I am hop= ing that we will therefore see more progress=2C starting with the Berlin meeting.=20 Magnus said:=20 >From my perspective functionality that isn't mature enough will have to=0A= be thrown out. I fear that will include some of my darlings. But that is=0A= the reality of umbrella standardization is that you have to work with=0A= what you have. For things that aren't ready enough to wait for=2C then you= =0A= publish and revisit later and see if they can be added.=0A= [BA] If there is a clean way to separate "v1.0" functionality from addons= =2C that would be welcome. However=2C in the current RTP usage draft there are open issues t= hat relate to the interaction of feedback messages and congestion control=2C which seems like= a "v2.0"=20 feature (e.g. "v1.0" is circuit-breakers). Also=2C there is an interaction= between the=20 approach to resolution/frame rate change and support for simulcast/layered = coding (e.g.=20 simulcast/layered coding implementations typically change resolution/frame = rate without SDP=20 re-negotiation=2C since the sender or mixer can drop layers/change simulcas= t encodings).=20 = --_0c3ab81e-24b0-41b7-909b-8de3fe702faa_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Magnus said:

Yes=2C =
there are some issue especially related to more advanced functions=0A=
around multi-stream transmission and layered coding where we don't yet=0A=
have finished specifications to reference yet. I agree that these have=0A=
been known for quite a long time. But from my perspective=2C the market=0A=
hasn't been desiring standardization of these functionalities=2C everyone=
=0A=
has been happy to have their own private silo of functionality where=0A=
things function by convention=2C rather than specification. I have been=0A=
actively working to get going on resolving these things for quite some=0A=
time.

[BA] The "market desire" has been growing strongly=2C now that=
 support for simulcast and
layered coding has become much more common.  =
Interestingly=2C many of the implementations have
independently chosen t=
o do things similarly (though not exactly the same way)=2C indicating
th=
at there is a basis for agreement about how things should work.  I am hopin=
g that we will
therefore see more progress=2C starting with the Berlin m=
eeting. 


Magnus said: 

From my perspective functionality =
that isn't mature enough will have to=0A=
be thrown out. I fear that will include some of my darlings. But that is=0A=
the reality of umbrella standardization is that you have to work with=0A=
what you have. For things that aren't ready enough to wait for=2C then you=
=0A=
publish and revisit later and see if they can be added.=0A=

[BA] If there is a clean way to separate "v1.0" functionality from addo=
ns=2C that would be
welcome.  However=2C in the current RTP usage draft =
there are open issues that relate to the
interaction of feedback message=
s and congestion control=2C which seems like a "v2.0" 
feature (e.g. "v1=
.0" is circuit-breakers).  Also=2C there is an interaction between the 
=
approach to resolution/frame rate change and support for simulcast/layered =
coding (e.g. 
simulcast/layered coding implementations typically change =
resolution/frame rate without SDP 
re-negotiation=2C since the sender or=
 mixer can drop layers/change simulcast encodings).

=
= --_0c3ab81e-24b0-41b7-909b-8de3fe702faa_-- From ggb@tokbox.com Mon Apr 22 16:59:35 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0A47C21F9457 for ; Mon, 22 Apr 2013 16:59:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.921 X-Spam-Level: X-Spam-Status: No, score=-4.921 tagged_above=-999 required=5 tests=[AWL=1.221, BAYES_00=-2.599, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_MED=-4, SUBJECT_FUZZY_TION=0.156] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id T1uh9VcX+wEx for ; Mon, 22 Apr 2013 16:59:34 -0700 (PDT) Received: from na3sys010aog110.obsmtp.com (na3sys010aog110.obsmtp.com [74.125.245.88]) by ietfa.amsl.com (Postfix) with SMTP id CB29821F8738 for ; Mon, 22 Apr 2013 16:59:33 -0700 (PDT) Received: from mail-lb0-f197.google.com ([209.85.217.197]) (using TLSv1) by na3sys010aob110.postini.com ([74.125.244.12]) with SMTP ID DSNKUXXO5ZFpBlopk2If+2X1LQyvOE3sPK1I@postini.com; Mon, 22 Apr 2013 16:59:34 PDT Received: by mail-lb0-f197.google.com with SMTP id y8so203330lbh.4 for ; Mon, 22 Apr 2013 16:59:32 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:x-received:from:content-type:content-transfer-encoding :subject:date:message-id:to:mime-version:x-mailer:x-gm-message-state; bh=TggRZ5AqxtiRkbxNr5l3LB4W7eV5eCu7+aGuNQzEk3M=; b=d/QIhw67oAgLBUcho6/+BVE74h3t6vRgItJXtJbdvHZ5V+Dje1XhirQjk+94yL/wiM lPJ2ayi7ctZmGP4TqYVsTZ3mn0CnYPiYHpHOOIPTqRXvnkUdhqI25wZfd5Yzy/Nd0NJy 3sk0+RT87SfOYsVprX5vPgLCo4HLUwISXZCp6oFUyOB2jfv4OG/vIsWWMcM2wS4rDF0z kDuk+d4J/X9/zTyAcT6bo+J7cGkZx2bC8uAShUFX4Bc5bhy8tcvHRgnSVd8xWxHUX7kl J5VQ7UVviyylHWtX10ZBn85OkQBRbMvQNS6YwwFR4YEYzjHp4Ys3vV2IyQw3lUsjahOj E4Gg== X-Received: by 10.194.89.234 with SMTP id br10mr57400295wjb.43.1366675171931; Mon, 22 Apr 2013 16:59:31 -0700 (PDT) X-Received: by 10.194.89.234 with SMTP id br10mr57400288wjb.43.1366675171805; Mon, 22 Apr 2013 16:59:31 -0700 (PDT) Received: from [192.168.10.114] (ginger.tokbox.com. [216.38.134.117]) by mx.google.com with ESMTPSA id ge7sm22223638wic.0.2013.04.22.16.59.29 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 22 Apr 2013 16:59:30 -0700 (PDT) From: =?iso-8859-1?Q?Gustavo_Garc=EDa?= Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Date: Mon, 22 Apr 2013 16:59:27 -0700 Message-Id: <3FD4B41A-2EF8-4B0B-9BB2-A7E4A2E8CB93@tokbox.com> To: rtcweb@ietf.org Mime-Version: 1.0 (Apple Message framework v1283) X-Mailer: Apple Mail (2.1283) X-Gm-Message-State: ALoCoQn7athIa480nc9KZcv85YNoWdktyRuFr/ViGot/FSfenLoVeskiu4LBQJepRcZbGX6R17yuANVXbpQcsJHY33XSSXYHlDBupt9gT+NOSDK7yvTuMo4pLYcu4DuKBrCvpt7TiVicLWY6OdgcbWDPIZNeGDMGNg== Subject: [rtcweb] Comments on draft-hutton-rtcweb-nat-firewall-considerations X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Apr 2013 23:59:35 -0000 In my opinion this kind of document is very useful and addresses = recurrent questions in this list and in the industry. Some comments: - I would add a recommendation on automatic TURN reconnections to handle = proxies max connection timeout. - I would clarify that scenarios in section 2 only require TURN server = if both endpoints and behind that type of NAT, not if only one of them = is behind it. - In section 2.2 we could add a comment on the requirement for = simultaneous-open support in case both endpoints and behind that kind of = NAT/FW. - There is a 3GPP document with a similar scope and introduces a similar = taxonomy (http://www.3gpp.org/ftp/Specs/html-info/33830.htm). I don't = like the terminology in that document but I think it is worth keeping it = in mind and probably referencing it. Regards, G. From magnus.westerlund@ericsson.com Tue Apr 23 00:06:08 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4074F21F9678 for ; Tue, 23 Apr 2013 00:06:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.133 X-Spam-Level: X-Spam-Status: No, score=-106.133 tagged_above=-999 required=5 tests=[AWL=0.116, BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id L3Hlq4XlRHQO for ; Tue, 23 Apr 2013 00:06:07 -0700 (PDT) Received: from mailgw7.ericsson.se (mailgw7.ericsson.se [193.180.251.48]) by ietfa.amsl.com (Postfix) with ESMTP id 23FA321F966E for ; Tue, 23 Apr 2013 00:06:06 -0700 (PDT) X-AuditID: c1b4fb30-b7f266d000000cb5-55-517632dd2889 Received: from esessmw0184.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw7.ericsson.se (Symantec Mail Security) with SMTP id 02.EF.03253.DD236715; Tue, 23 Apr 2013 09:06:06 +0200 (CEST) Received: from [127.0.0.1] (153.88.115.8) by esessmw0184.eemea.ericsson.se (153.88.115.82) with Microsoft SMTP Server id 8.3.279.1; Tue, 23 Apr 2013 09:06:05 +0200 Message-ID: <517632D7.200@ericsson.com> Date: Tue, 23 Apr 2013 09:05:59 +0200 From: Magnus Westerlund User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: "Dale R. Worley" References: <066.4c5db43349d3176acaa90d17617a02d6@trac.tools.ietf.org> <5173ECC7.7020909@jitsi.org> <51754363.3090300@ericsson.com> <201304222215.r3MMFqsE3199256@shell01.TheWorld.com> In-Reply-To: <201304222215.r3MMFqsE3199256@shell01.TheWorld.com> X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprBLMWRmVeSWpSXmKPExsUyM+Jvre49o7JAg2/d3BbXzvxjtFj7r53d 4uWJMgdmj8n7vzJ77Jx1l91jyZKfTAHMUVw2Kak5mWWpRfp2CVwZLy50sBZslqjYOWshUwPj WeEuRk4OCQETie8/pjJB2GISF+6tZ+ti5OIQEjjFKLHk2xQWCGc5o8S083uYQap4BdQldk/6 C2azCKhKzHr2GqybTcBC4uaPRqBuDg5RgWCJra0xEOWCEidnPmEBCYsIaEp0LMgBCTML2Els vnabFcQWFjCTOLlpEQuILSTwh1Fi5t1qEJtTwEGid8J+VojbJCW2vGhnh+jVk5hytYURwpaX aN46mxmiV1uioamDdQKj0Cwkm2chaZmFpGUBI/MqRvbcxMyc9HLzTYzA0D245bfBDsZN98UO MUpzsCiJ84a7XggQEkhPLEnNTk0tSC2KLyrNSS0+xMjEwSnVwLi7xssjRyVu4Y1npfse2Oxd U5X+W6491XJeiIH8cfYJ+jbWpW68h37dSnq1feV+D8vK/RfaQjN0Hy40fJjnnTFF96aM7OFP sR8KwpI+6xWdm/TG7E7ix+mz5VZfV/S4NtFDRDpxpnbDHCPtXcvXX/tqpKa971QJj2l7xRbe AouvV1foCIb0f1ViKc5INNRiLipOBAD2d2cuKwIAAA== Cc: rtcweb@ietf.org Subject: Re: [rtcweb] #15: Section 4.8: SSRC signaling X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Apr 2013 07:06:08 -0000 On 2013-04-23 00:15, Dale R. Worley wrote: >> From: Martin Thomson >> >> On 22 April 2013 07:04, Magnus Westerlund >> wrote: >>> Yes, we will be more explicit that one MUST be able to handle >>> unannounced SSRCs, this is the result of having this sentence: >>> "Use of the "a=ssrc:" attribute is OPTIONAL." If it is optional to use >>> then a receiver must be capable of dealing when they show up unannounced. > >> The basic problem is that you don't have an answer that provides you >> with the necessary information. Even if you could somehow associate >> an incoming packet with an m= line, [...] > > My understanding is that associating an incoming RTP packet with an m= > line is a solved problem -- the transport association on which the > packet arrives determines the bundle, and (within all of the currently > active bundling proposals) the payload type tells which m= line within > the bundle. > I think this is one aspect of the bundle that doesn't work. You will need to be able to use the same PT configuration and number (remember that they are on RTP session level) to avoid running out of them and I believe some limitations. This, is also highly dependent on where on the scale we end up with the usage of a m= block. If that is per media source, then it is clearly a no-go to not allow the same. The other end of the spectra is one m= block per media type being allowed. I think we will end up somewhere in the middle, with different m= blocks depending on usage of media streams. But this is really an MMUSIC question. In this context, I do wonder if it at all matters which m= block the the SSRC was intended for, as long as a receiver correctly can receive and process the media. Which the payload type should provide most of the functionality for. >> [...] you don't have any way to >> determine what identifier the remote side attached to that stream. >> It's also unknown how that stream was grouped prior to being put on >> the network. This is somewhat important because we expect it to >> happen in a lot of cases. > > However, I believe you are correct that knowing which m= line contains > the SSRC does not tell the RtcWeb stream identification. Correct, but for legacy use-cases you might have to accept some limiations that you can't get the ID's across the PeerConnection and your JS will have to work with locally generated ids. I think the issue is really around when the signalling glitches and you get locally generated IDs that then needs to be changed to the actual signalled ones. Cheers Magnus Westerlund ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- From pthatcher@google.com Tue Apr 23 11:05:47 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EB47621F964E for ; Tue, 23 Apr 2013 11:05:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.976 X-Spam-Level: X-Spam-Status: No, score=-102.976 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id st0XEU8BoV+u for ; Tue, 23 Apr 2013 11:05:47 -0700 (PDT) Received: from mail-pa0-f52.google.com (mail-pa0-f52.google.com [209.85.220.52]) by ietfa.amsl.com (Postfix) with ESMTP id 3581221F9623 for ; Tue, 23 Apr 2013 11:05:46 -0700 (PDT) Received: by mail-pa0-f52.google.com with SMTP id fb1so648573pad.25 for ; Tue, 23 Apr 2013 11:05:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=sKISKMTF7gGJgcUPe/ruLy8Qb8rLLe7zYKw2/OQU3wo=; b=CyZh0pA+KvS2UfeGczbmVFcEro4j6kCCJM1RCMdF8rlenUSjijDIykmj1tbPPvIdrK psGEY/tm4NjhHwMilb9wbw15uMfhAFV8/Gca8HdOpqaKirLfgBjHjCCEdauvPvFs87Jt Pu3CXx2ZVbQpU045fbzupKGpnnnROFEn9IRa79fBXKnRXGEweYtY7XP4eERA+wBBZJcn 3ThbQ89Pq7oQYM8iTa0gR1y7U+Mph2BbAwKY6q1/Ac//OSAtVOCoym7Zbw21AjL4Va6d mDGzAvXE1lXSgH7KqtCy2Fd0F6nw2DDuVI24uWHX9Ap8mqEGOxXoXZqMnRSV+xA7BXm1 3n1A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:x-gm-message-state; bh=sKISKMTF7gGJgcUPe/ruLy8Qb8rLLe7zYKw2/OQU3wo=; b=l23gQXctjF4zJMFEDXVcBYYL7NC3i9amy4RO8ZMKeFks84E/1SUTWlVEGgb4FFLgrD DY8y4TragBDXf9mqy2FgN51sZZnrgkQmdnV8zIWLRAMbUHGe6iV5zINUgQB4EsSAOShX bWrIg0Nbn8yP+HYulJrz4xEE/35M69qJSHndtfmRRQOdkXNgx8ZcXYRE8qBEgTVCEu6W 32ISTg+TJACt1K8YybEe+Joo92To5Pu/2m3v0cnTUgLiGmvqaK/oTwTE/vG9aaFqTXC8 uHosixuMsD8cFL4ax/ZRH8d3F5Nt98UgLQhlKgNmuOuclLSevj9lnoDMbKxf+krEtUtU Z/gw== X-Received: by 10.66.26.71 with SMTP id j7mr11034753pag.209.1366740346623; Tue, 23 Apr 2013 11:05:46 -0700 (PDT) MIME-Version: 1.0 Received: by 10.66.228.138 with HTTP; Tue, 23 Apr 2013 11:05:06 -0700 (PDT) In-Reply-To: References: <516328C9.7070506@jesup.org> <516FBF34.1070500@ericsson.com> <517545DE.5060208@ericsson.com> From: Peter Thatcher Date: Tue, 23 Apr 2013 11:05:06 -0700 Message-ID: To: Harald Alvestrand Content-Type: multipart/alternative; boundary=bcaec520f361dc808604db0b0878 X-Gm-Message-State: ALoCoQnpOTNybpaZfOnduCub6D9A8YlN2DVUEx/sYIj1B9htQ6XkANhf8iaNR8Z11SSy+Iac6O+iWBuMty7y8eEoDTvFqWfqDsbbf+UD7JRnIBlbeWAEmEeaQ4mApHhoWsvDtH5FUWAj3Njdo03qFE4TBVxQKltsCUOSZ8w07FvbSZkEJTQcbw2XuG3OV9MXSGIRkq2JIiGc Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] Minutes for the Data Channel Presentations X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Apr 2013 18:05:48 -0000 --bcaec520f361dc808604db0b0878 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable I support the proposal that we agreed to in Orlando, and which includes what Harald just said: - SCTP is in SDP only to set up the transport, and individual data channels are not mentioned in the SDP. - The send and receive SID are the same for a given data channel. - The JS can specify the SID, and an even/odd mechanism is used by the browser for selecting the SID if not chosen by the JS. - There is an in-band "OPEN" message, but it is optional. That's what I support. On Mon, Apr 22, 2013 at 3:22 PM, Harald Alvestrand wrote: > It clearly wasn't clear to Bernard either :-) > > I supported what draft-jesup was suggesting - negotiating usage of SCTP i= n > SDP, and not mentioning individual data channels in the SDP. > > > > On Mon, Apr 22, 2013 at 4:14 PM, Magnus Westerlund < > magnus.westerlund@ericsson.com> wrote: > >> Harald and Peter, >> >> Can you bring any clarity on what you supported? >> >> Cheers >> >> Magnus >> >> On 2013-04-20 03:04, Bernard Aboba wrote: >> > Magnus said: >> > >> >> I have now updated the minutes trying to clarify the context and the >> >> corrections. Please check if you think this makes it clearer. If not = I >> >> am happy to introduce additional clarifications, but please be explic= it >> >> about what should be changed. >> >> >> >> http://www.ietf.org/proceedings/86/minutes/minutes-86-rtcweb >> >> >> > >> > >> > Peter Thatcher commented that he thinks the presenter's proposal >> > (draft=C2=ADjesup=C2=ADrtcweb=C2=ADdata=C2=ADprotocol=C2=AD04) is gre= at. >> > >> > [BA] My impression was that this remark more related to the presentati= on >> > suggestions relating to removing of stream negotiation from SDP, which >> > isn't covered in draft-jesup-rtcweb-data-protocol-04. >> > >> > Harald Alvestrand stated that he Agree with this. Glad got data channe= l >> > negotiation out of the document. >> > >> > [BA] Since draft-jesup-rtcweb-data-protocol is about setting up data >> > channels this doesn't make sense to me. Was Harald perhaps referring = to >> > getting data channel negotiation "out of SDP"? >> > >> > >> > >> > >> >> >> -- >> >> Magnus Westerlund >> >> ---------------------------------------------------------------------- >> Multimedia Technologies, Ericsson Research EAB/TVM >> ---------------------------------------------------------------------- >> Ericsson AB | Phone +46 10 7148287 >> F=C3=A4r=C3=B6gatan 6 | Mobile +46 73 0949079 >> SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com >> ---------------------------------------------------------------------- >> >> > --bcaec520f361dc808604db0b0878 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
I support the proposal that we agreed to in Orlando, and w= hich includes what Harald just said:

- SCTP is in SDP on= ly to set up the transport, and individual data channels are not mentioned = in the SDP.
- The send and receive SID are the same for a given data channel= .
- The JS can specify the SID, and an even/odd mechanism i= s used by the browser for selecting the SID if not chosen by the JS.
- There is an in-band "OPEN" message, but it is option= al.

That's what I support.


On Mon, A= pr 22, 2013 at 3:22 PM, Harald Alvestrand <hta@google.com> wrot= e:
It clearly wasn't clear= to Bernard either :-)

I supported what draft-jesup was = suggesting - negotiating usage of SCTP in SDP, and not mentioning individua= l data channels in the SDP.



On Mon, Apr 22, 2013 at 4:1= 4 PM, Magnus Westerlund <magnus.westerlund@ericsson.com&g= t; wrote:
Harald and Peter,

Can you bring any clarity on what you supported?

Cheers

Magnus

On 2013-04-20 03:04, Bernard Aboba wrote:
> Magnus said:
>
>> I have now updated the minutes trying to clarify the context and t= he
>> corrections. Please check if you think this makes it clearer. If n= ot I
>> am happy to introduce additional clarifications, but please be exp= licit
>> about what should be changed.
>>
>> http://www.ietf.org/proceedings/86/minutes/minutes= -86-rtcweb
>>
>
>
> Peter Thatcher commented that he thinks the presenter's proposal > (draft=C2=ADjesup=C2=ADrtcweb=C2=ADdata=C2=ADprotocol=C2=AD04) =C2=A0i= s great.
>
> [BA] My impression was that this remark more related to the presentati= on
> suggestions relating to removing of stream negotiation from SDP, which=
> isn't covered in draft-jesup-rtcweb-data-protocol-04.
>
> Harald Alvestrand stated that he Agree with this. Glad got data channe= l
> negotiation out of the document.
>
> [BA] =C2=A0Since draft-jesup-rtcweb-data-protocol is about setting up = data
> channels this doesn't make sense to me. =C2=A0Was Harald perhaps r= eferring to
> getting data channel negotiation "out of SDP"?
>
>
>
>


--

Magnus Westerlund

----------------------------------------------------------------------
Multimedia Technologies, Ericsson Research EAB/TVM
----------------------------------------------------------------------
Ericsson AB =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| Phone = =C2=A0+46 10 7148287
F=C3=A4r=C3=B6gatan 6 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0| Mobile +46 73 0949079
SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com
----------------------------------------------------------------------



--bcaec520f361dc808604db0b0878-- From pthatcher@google.com Tue Apr 23 11:18:06 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0E75F21F9691 for ; Tue, 23 Apr 2013 11:18:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.976 X-Spam-Level: X-Spam-Status: No, score=-102.976 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7ABqvNe3fhdm for ; Tue, 23 Apr 2013 11:18:04 -0700 (PDT) Received: from mail-pa0-f49.google.com (mail-pa0-f49.google.com [209.85.220.49]) by ietfa.amsl.com (Postfix) with ESMTP id 3C3A021F9675 for ; Tue, 23 Apr 2013 11:18:04 -0700 (PDT) Received: by mail-pa0-f49.google.com with SMTP id kp14so658936pab.36 for ; Tue, 23 Apr 2013 11:18:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=YhJbTODKnCj3IuKqyh1MNoaIFosK9xuL8O/k0sLZvPM=; b=PD5MQXDeucCAzyeqmtUAR4beev7ikcfELy/einwedHR0gHLtAhai4pwYIiBUB8DCTH 997UMM4bVo0x1d8BVD0bb4AgQMFm931Jm2Dkw562e8/tOdDZ8oFfMYVRbWPuS7Jap7D3 VCeENfuSX88ufKItnCEHsL6oTbXy0fmpuJkHjPl2v4YfNQmSNwkdn8FbqIeDlg0n8uuh d2vXr6jlT7OET5EoBXIxEPyfKEcWjFS7Cyeeg+f8/AwFVAKGt5iL0YH+joF+QWnbzoZo PjPx9l6FBAQMKj4PGK+PF6wRrl2Fwwxm7Z/zy5S0wlA7IFpm7oTe9GkBb06zmoGoaHQY cdCA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:x-gm-message-state; bh=YhJbTODKnCj3IuKqyh1MNoaIFosK9xuL8O/k0sLZvPM=; b=BZFAkUfNxfTy8Q8IaI3SN6ZruTWuaLq1OSknNwaD/XC3nVqzorIxBHXSvtoUWuZULe cWBGwV7ZxpdfadgXcBmlyzHI5k4SH15KN5tlrryBEz5L19BAcN5A3vnxnjruAULzSuFL jjngk0m1GanaGfi0s9Xisha4Ho4inID9+K04PsBZySHpd+yKmDs1vvEVAxyiUchUbMa6 yGiPEqUtaZ1Xb7g8e5/0EQ43IkaGRlA3JQGuaUTmlboWqBaiCZ5UBB4t59SKe2bWpUPc 5eW6RySVwN7pJLFnJmxaEV0Mfe2TwYlvOYjSC1ruKootgvihXpeYyIc18N8uSUkPhdxt NFoQ== X-Received: by 10.66.240.41 with SMTP id vx9mr14033810pac.121.1366741083903; Tue, 23 Apr 2013 11:18:03 -0700 (PDT) MIME-Version: 1.0 Received: by 10.66.228.138 with HTTP; Tue, 23 Apr 2013 11:17:23 -0700 (PDT) In-Reply-To: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> <516F9A5A.6080402@alvestrand.no> <5170247F.4090908@alvestrand.no> <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de> <5171734E.3050300@jesup.org> From: Peter Thatcher Date: Tue, 23 Apr 2013 11:17:23 -0700 Message-ID: To: Martin Thomson Content-Type: multipart/alternative; boundary=047d7b15a815ce77b704db0b3421 X-Gm-Message-State: ALoCoQnPbx1/fPDQ1RlJy64U8oYqMpGlvtWDfqlXn1v7A/6UJl4rWagSx7ycHyi+iNRWqh6q1ZpNsZgFgYT0f5u1adoYPzS4ZxmdwQMFITPY1JLh8eoURZr/W4nQGtPRVqIlmUMkPG/rNfcqUC973Lpop13BCPgRdDE/L1NQPY7IkIPhWBEj5iT0XEwO1pfCe0F/ufbTS/G4 Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Apr 2013 18:18:06 -0000 --047d7b15a815ce77b704db0b3421 Content-Type: text/plain; charset=UTF-8 Based on feedback, it sounds like we're basically narrowing this down to "buffer for a while and then fire an error locally without giving the data to JS, and close the stream so the remote side knows". That sounds pretty good to me. On Fri, Apr 19, 2013 at 12:12 PM, Peter Thatcher wrote: > I like all the discussion, but I feel like we need to get back to the > question and what options we have. The question: "what does the browser do > with unexpected data (before an open of an unregistered sid)?" > > 1. Buffer forever without limits: Randell thinks it's OK to buffer > forever without limits. Martin disagrees. I disagree (I agree with > Martin). > 2. Buffer with limits, and then: > a. Hand an error to JS saying "got some data for a data channel, but an > OPEN never came" WITHOUT providing the data to JS: Harald likes this. I'm > OK with this. > b. Hand an error to JS saying "got some data for a data channel, but an > OPEN never came" WITH providing the data: I like this better, since I don't > see a reason not to give JS the data. > c. Fire .ondatachannel: This is what I was was originally thinking, but > I understand the downsides mentioned, and would be happy with (b) instead. > > > Right now, it seems like 2a or 2b is our best options, mixed with > resetting the stream. In other words, if I'm a browser, I'd do something > like: > > function handle_data(sid, data) { > if (is_open_message(data)) { > var info = get_stream_info(data) > var buffered_data = clear_buffer(sid) > fire_ondatachannel(sid, info) > fire_ondata(sid, buffered_data) > } else if (has_known_stream(sid)) { > fire_ondata(sid, data) > } else if (buffer_has_space(sid)) { > add_to_buffer(sid, data) > } else { > var buffered_data = clear_buffer(sid) > fire_unknownchannelerror_in_js(sid, buffered_data) > reset_stream(sid) > } > } > > > Are there other options I'm missing or didn't understand? > > > > On Fri, Apr 19, 2013 at 11:11 AM, Martin Thomson > wrote: > >> On 19 April 2013 09:39, Randell Jesup wrote: >> > the Open *will* eventually get through unless you have >> > 100% (or virtually so) packet loss >> >> I'm going to pretend you didn't say that. If you want to talk odds, >> that's fine, but I think that you'll find that this sort of error is >> far more likely than you realize. We're talking the probability of >> incoming data exceeding a given threshold prior to an open being >> delivered. After all, unless you have 0% loss, the *possible* maximum >> amount of data is infinite. Though large numbers might be of >> relatively low probability on an individual basis, operating at scale >> you are going to encounter surprising spikes. >> >> > I honestly feel it's ok to just buffer all incoming packets while >> waiting for the Open. >> >> That's not a warm fuzzy that I share. >> >> > No one is going to get a gigabyte of data in without an Open... A >> > non-browser could fake up a session and start sending data without ever >> > sending an Open... but flushing the data doesn't actually help you >> against >> > that sort of active DOS (they can just start again, they can spread it >> > across thousands of channels, etc, etc), and there are FAR better DOS >> > methods - all this would do is burn some CPU and some memory. >> >> I think that would be a mistake. This isn't about denial of service, >> it's about genuine usage cases that encounter errors. The receiver >> can't use the receive window to apply back pressure if they are >> reading from the stream to look for the open message, so you end up >> with an unbounded amount of data. The amount of data will scale with >> bandwidth delay product. A long, fat pipe might burn more CPU and >> memory than you are willing to tolerate. >> >> Then it comes down to what experience you want to provide to the >> unfortunates who encounter this problem. >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb >> > > --047d7b15a815ce77b704db0b3421 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Based on feedback, it sounds like we're basically narr= owing this down to "buffer for a while and then fire an error locally = without giving the data to JS, and close the stream so the remote side know= s". =C2=A0That sounds pretty good to me.


On Fri,= Apr 19, 2013 at 12:12 PM, Peter Thatcher <pthatcher@google.com>= wrote:
I like all the discussion, = but I feel like we need to get back to the question and what options we hav= e. =C2=A0The question: "what does the browser do with unexpected data = (before an open of an unregistered sid)?"

1. Buffer forever without limits: =C2=A0Randell thinks it= 9;s OK to buffer forever without limits. =C2=A0Martin disagrees. =C2=A0I di= sagree (I agree with Martin).
2. Buffer with limits, and then:
=C2=A0 a. =C2=A0Hand an error to JS saying "got some data for a d= ata channel, but an OPEN never came" WITHOUT providing the data to JS:= Harald likes this. =C2=A0I'm OK with this.
=C2=A0 b. =C2=A0H= and an error to JS saying "got some data for a data channel, but an OP= EN never came" WITH providing the data: I like this better, since I do= n't see a reason not to give JS the data. =C2=A0
=C2=A0 c. =C2=A0Fire .ondatachannel: This is what I was was originally= thinking, but I understand the downsides mentioned, and would be happy wit= h (b) instead.
=C2=A0

Right now, it = seems like 2a or 2b is our best options, mixed with resetting the stream. = =C2=A0In other words, if I'm a browser, I'd do something like:

function handle_data(sid, data) {
=C2=A0 = if (is_open_message(data)) {
=C2=A0 =C2=A0 var info =3D get_strea= m_info(data)
=C2=A0 =C2=A0 var buffered_data =3D clear_buffer(sid= )
=C2=A0 =C2=A0 fire_ondatachannel(sid, info)
=C2=A0 =C2=A0 fire_ondata(sid, buffered_data)
=C2=A0 } else if (has_known_stream(sid)) {
=C2=A0 =C2=A0 fir= e_ondata(sid, data)
=C2=A0 } else if (buffer_has_space(sid)) {
=C2=A0 =C2=A0 add_to_buffer(sid, data)
=C2=A0 } else {
=C2=A0 =C2=A0 var buffered_data =3D clear_buffer(sid)
=C2=A0= =C2=A0 fire_unknownchannelerror_in_js(sid, buffered_data)
=C2=A0= =C2=A0 reset_stream(sid)
=C2=A0 }
}

=

Are there other options I'm missing or didn't u= nderstand?



On Fri, Apr 19, 2013 at 11:11 AM, = Martin Thomson <martin.thomson@gmail.com> wrote:
On 19 April 2013 09:39, Randell Jesup &= lt;randell-ietf= @jesup.org> wrote:
> the Open *will* eventually get through unless you have
> 100% (or virtually so) packet loss

I'm going to pretend you didn't say that. =C2=A0If you want t= o talk odds,
that's fine, but I think that you'll find that this sort of error i= s
far more likely than you realize. =C2=A0We're talking the probability o= f
incoming data exceeding a given threshold prior to an open being
delivered. =C2=A0After all, unless you have 0% loss, the *possible* maximum=
amount of data is infinite. =C2=A0Though large numbers might be of
relatively low probability on an individual basis, operating at scale
you are going to encounter surprising spikes.

> I honestly feel it's ok to just buffer all incoming packets while = waiting for the Open.

That's not a warm fuzzy that I share.

> No one is going to get a gigabyte of data in without an Open... =C2=A0= A
> non-browser could fake up a session and start sending data without eve= r
> sending an Open... but flushing the data doesn't actually help you= against
> that sort of active DOS (they can just start again, they can spread it=
> across thousands of channels, etc, etc), and there are FAR better DOS<= br> > methods - all this would do is burn some CPU and some memory.

I think that would be a mistake. =C2=A0This isn't about denial of= service,
it's about genuine usage cases that encounter errors. =C2=A0The receive= r
can't use the receive window to apply back pressure if they are
reading from the stream to look for the open message, so you end up
with an unbounded amount of data. =C2=A0The amount of data will scale with<= br> bandwidth delay product. =C2=A0A long, fat pipe might burn more CPU and
memory than you are willing to tolerate.

Then it comes down to what experience you want to provide to the
unfortunates who encounter this problem.
_______________________________________________
rtcweb mailing list
rtcweb@ietf.org = https://www.ietf.org/mailman/listinfo/rtcweb


--047d7b15a815ce77b704db0b3421-- From worley@shell01.TheWorld.com Tue Apr 23 12:00:03 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id ADAEA21F93BC for ; Tue, 23 Apr 2013 12:00:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.98 X-Spam-Level: X-Spam-Status: No, score=-2.98 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1, RCVD_IN_SORBS_WEB=0.619] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id i4CyFESsKzsk for ; Tue, 23 Apr 2013 12:00:03 -0700 (PDT) Received: from TheWorld.com (pcls6.std.com [192.74.137.146]) by ietfa.amsl.com (Postfix) with ESMTP id F13B821F9377 for ; Tue, 23 Apr 2013 12:00:02 -0700 (PDT) Received: from shell.TheWorld.com (root@shell01.theworld.com [192.74.137.71]) by TheWorld.com (8.14.5/8.14.5) with ESMTP id r3NIw7SC012138 for ; Tue, 23 Apr 2013 14:58:09 -0400 Received: from shell01.TheWorld.com (localhost.theworld.com [127.0.0.1]) by shell.TheWorld.com (8.13.6/8.12.8) with ESMTP id r3NIw6MO3252012 for ; Tue, 23 Apr 2013 14:58:06 -0400 (EDT) Received: (from worley@localhost) by shell01.TheWorld.com (8.13.6/8.13.6/Submit) id r3NIw4OJ3260483; Tue, 23 Apr 2013 14:58:04 -0400 (EDT) Date: Tue, 23 Apr 2013 14:58:04 -0400 (EDT) Message-Id: <201304231858.r3NIw4OJ3260483@shell01.TheWorld.com> From: worley@ariadne.com (Dale R. Worley) Sender: worley@ariadne.com (Dale R. Worley) To: rtcweb@ietf.org In-reply-to: (martin.thomson@gmail.com) References: <066.4c5db43349d3176acaa90d17617a02d6@trac.tools.ietf.org> <5173ECC7.7020909@jitsi.org> <51754363.3090300@ericsson.com> <201304222215.r3MMFqsE3199256@shell01.TheWorld.com> Subject: Re: [rtcweb] #15: Section 4.8: SSRC signaling X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Apr 2013 19:00:03 -0000 > From: Martin Thomson > > On 22 April 2013 15:15, Dale R. Worley wrote: > > My understanding is that associating an incoming RTP packet with an m= > > line is a solved problem -- the transport association on which the > > packet arrives determines the bundle, and (within all of the currently > > active bundling proposals) the payload type tells which m= line within > > the bundle. > > Not so. If you have five PTs on each m= line, and 30 m= lines, you > just don't have that many PTs available. At some point you have to > recognize that SSRC is what you have to use. (Neither number is > extraordinary.) But why would you use 30 m= lines? You'd only have 30 streams in a videoconference-type situation, where the streams don't have distinct roles and so don't need to be given role labels. As far as I know, current videoconference systems don't put each video stream in a separate m= line. Dale From bernard_aboba@hotmail.com Tue Apr 23 12:17:20 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C08A821F9778 for ; Tue, 23 Apr 2013 12:17:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -101.901 X-Spam-Level: X-Spam-Status: No, score=-101.901 tagged_above=-999 required=5 tests=[AWL=-0.698, BAYES_00=-2.599, MIME_QP_LONG_LINE=1.396, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pDXSw9xQpeaB for ; Tue, 23 Apr 2013 12:17:20 -0700 (PDT) Received: from blu0-omc3-s12.blu0.hotmail.com (blu0-omc3-s12.blu0.hotmail.com [65.55.116.87]) by ietfa.amsl.com (Postfix) with ESMTP id 3215921F9763 for ; Tue, 23 Apr 2013 12:17:20 -0700 (PDT) Received: from BLU404-EAS88 ([65.55.116.74]) by blu0-omc3-s12.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Tue, 23 Apr 2013 12:17:19 -0700 X-EIP: [sJs8hZ9EGzLpU8YISfIy7P6ZYVo1y7YpVgMfGL3q/pw=] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable References: <066.4c5db43349d3176acaa90d17617a02d6@trac.tools.ietf.org> <5173ECC7.7020909@jitsi.org> <51754363.3090300@ericsson.com> <201304222215.r3MMFqsE3199256@shell01.TheWorld.com> <201304231858.r3NIw4OJ3260483@shell01.TheWorld.com> From: Bernard Aboba MIME-Version: 1.0 (1.0) In-Reply-To: <201304231858.r3NIw4OJ3260483@shell01.TheWorld.com> Date: Tue, 23 Apr 2013 12:17:18 -0700 To: "Dale R. Worley" X-OriginalArrivalTime: 23 Apr 2013 19:17:19.0889 (UTC) FILETIME=[2CD63010:01CE4057] Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #15: Section 4.8: SSRC signaling X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Apr 2013 19:17:20 -0000 If you have several devices per host (e.g. Multiple cameras) each using simu= lcast or layered coding, are supporting screen sharing/data channel/audio+vi= deo and also have a single m=3D line for each RTP stream, then this isn't so= outlandish. On Apr 23, 2013, at 12:00, "Dale R. Worley" wrote: > But why would you use 30 m=3D lines? You'd only have 30 streams in a > videoconference-type situation, where the streams don't have distinct > roles and so don't need to be given role labels. As far as I know, > current videoconference systems don't put each video stream in a > separate m=3D line. >=20 >=20 From mzanaty@cisco.com Tue Apr 23 14:04:03 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 50FFC21F96F7 for ; Tue, 23 Apr 2013 14:04:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.599 X-Spam-Level: X-Spam-Status: No, score=-10.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KufVEORLhOTO for ; Tue, 23 Apr 2013 14:04:01 -0700 (PDT) Received: from rcdn-iport-8.cisco.com (rcdn-iport-8.cisco.com [173.37.86.79]) by ietfa.amsl.com (Postfix) with ESMTP id 7BCC421F96E1 for ; Tue, 23 Apr 2013 14:04:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2890; q=dns/txt; s=iport; t=1366751041; x=1367960641; h=from:to:subject:date:message-id:references:in-reply-to: content-transfer-encoding:mime-version; bh=hjGH832xlQ+//MlvY6ZSBs6dMt8TpG9OzLKP6Zzi6ew=; b=SKlJMXCo82WAQ0cL04kLVjfMRZzuuJekjndTmiquaw+gn5xhrUrp+Kez BUVSjHnwlYScq8Gl8F3jrOvZixjkyKgOxSpwXWyu9ep0iKT75SBHXgYpi SHYUMLVLZNvAv0Z/vNpJ/tYBWczm8ukGNTsyOse0LSPQ1NMpr5bRrY0aH 8=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AhoFAHj2dlGtJV2Z/2dsb2JhbABQgwY2vk6BBRZ0gh8BAQEDAQEBATc0EAcEAgEIEQQBAQEKFAkHIQYLFAkIAgQBEgiHegMJBgyuToZNDYhQBIxRgiY4BoJiYQOVNo1ihR+DDoIo X-IronPort-AV: E=Sophos;i="4.87,537,1363132800"; d="scan'208";a="202197592" Received: from rcdn-core-2.cisco.com ([173.37.93.153]) by rcdn-iport-8.cisco.com with ESMTP; 23 Apr 2013 21:04:01 +0000 Received: from xhc-aln-x14.cisco.com (xhc-aln-x14.cisco.com [173.36.12.88]) by rcdn-core-2.cisco.com (8.14.5/8.14.5) with ESMTP id r3NL40eJ028480 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Tue, 23 Apr 2013 21:04:00 GMT Received: from xmb-rcd-x14.cisco.com ([169.254.4.181]) by xhc-aln-x14.cisco.com ([173.36.12.88]) with mapi id 14.02.0318.004; Tue, 23 Apr 2013 16:04:00 -0500 From: "Mo Zanaty (mzanaty)" To: "Dale R. Worley" , "rtcweb@ietf.org" Thread-Topic: [rtcweb] #15: Section 4.8: SSRC signaling Thread-Index: AQHOQFTKhOkBkmI7Yk+A/tDh7Us1lpjkNUQA Date: Tue, 23 Apr 2013 21:03:59 +0000 Message-ID: <3879D71E758A7E4AA99A35DD8D41D3D90F6DB734@xmb-rcd-x14.cisco.com> References: <066.4c5db43349d3176acaa90d17617a02d6@trac.tools.ietf.org> <5173ECC7.7020909@jitsi.org> <51754363.3090300@ericsson.com> <201304222215.r3MMFqsE3199256@shell01.TheWorld.com> <201304231858.r3NIw4OJ3260483@shell01.TheWorld.com> In-Reply-To: <201304231858.r3NIw4OJ3260483@shell01.TheWorld.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [64.102.88.107] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: Re: [rtcweb] #15: Section 4.8: SSRC signaling X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Apr 2013 21:04:03 -0000 You can easily exhaust the dynamic payload type number space (96-127) with = only a few media lines, not 30. Keep in mind the primary purpose of payload= type is to negotiate codecs, not demux different streams. An offer from a = highly interoperable product will contain many payload types for each strea= m. It is not uncommon to support 8+ payload types and 4+ streams, which qui= ckly exhausts the dynamic space. Also keep in mind that many codecs have di= fferent configurations that are expressed as different payload types, so ev= en supporting a single audio and video codec can yield many payload types i= f those codecs are highly configurable. Consider a very simple product (smartphone) in a very simple use case (3-wa= y video chat). It supports several audio codecs (OPUS, AAC-LD, AMR-WB, AMR-= NB, G.711) and several video codecs (VP8, VP9, H.264, H.265). It supports s= everal H.264 profiles (BP, HP, SBP, SHP) and packetization modes (0, 1). Th= is already exhausts all 32 dynamic payload types, before we even consider t= hings like FEC, scalable or simulcast layers sent via MST, screen sharing, = multiple cameras, etc. So I would strongly discourage folks from assuming payload type demux is vi= able in most use cases. It may be viable when there is a single audio and v= ideo stream, each using a single codec and configuration. But it quickly be= comes impractical or impossible when the product gets more capable or the u= se case gets more interesting. Mo -----Original Message----- From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of= Dale R. Worley Sent: Tuesday, April 23, 2013 2:58 PM To: rtcweb@ietf.org Subject: Re: [rtcweb] #15: Section 4.8: SSRC signaling > From: Martin Thomson >=20 > On 22 April 2013 15:15, Dale R. Worley wrote: > > My understanding is that associating an incoming RTP packet with an m= =3D > > line is a solved problem -- the transport association on which the > > packet arrives determines the bundle, and (within all of the currently > > active bundling proposals) the payload type tells which m=3D line withi= n > > the bundle. >=20 > Not so. If you have five PTs on each m=3D line, and 30 m=3D lines, you > just don't have that many PTs available. At some point you have to > recognize that SSRC is what you have to use. (Neither number is > extraordinary.) But why would you use 30 m=3D lines? You'd only have 30 streams in a videoconference-type situation, where the streams don't have distinct roles and so don't need to be given role labels. As far as I know, current videoconference systems don't put each video stream in a separate m=3D line. Dale _______________________________________________ rtcweb mailing list rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb From bernard_aboba@hotmail.com Tue Apr 23 20:25:58 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 34AA921F91C3 for ; Tue, 23 Apr 2013 20:25:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.228 X-Spam-Level: X-Spam-Status: No, score=-102.228 tagged_above=-999 required=5 tests=[AWL=-0.230, BAYES_00=-2.599, HTML_MESSAGE=0.001, J_CHICKENPOX_34=0.6, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id D+9ZqJJq3IKa for ; Tue, 23 Apr 2013 20:25:57 -0700 (PDT) Received: from blu0-omc3-s23.blu0.hotmail.com (blu0-omc3-s23.blu0.hotmail.com [65.55.116.98]) by ietfa.amsl.com (Postfix) with ESMTP id 07A2E21F91BC for ; Tue, 23 Apr 2013 20:25:56 -0700 (PDT) Received: from BLU169-W114 ([65.55.116.74]) by blu0-omc3-s23.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Tue, 23 Apr 2013 20:25:56 -0700 X-EIP: [rtKbTMNuC0GLCBAk+VG8dZ361t/6YEia] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: multipart/alternative; boundary="_ccfdd842-29ad-4c01-913d-54a64a82d64a_" From: Bernard Aboba To: Peter Thatcher , Martin Thomson Date: Tue, 23 Apr 2013 20:25:56 -0700 Importance: Normal In-Reply-To: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org>, <516CE3EC.2050804@jesup.org>, , , , <516F1AF9.2080301@alvestrand.no>, , <516F9A5A.6080402@alvestrand.no>, , <5170247F.4090908@alvestrand.no>, , <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de>, , <5171734E.3050300@jesup.org>, , , MIME-Version: 1.0 X-OriginalArrivalTime: 24 Apr 2013 03:25:56.0597 (UTC) FILETIME=[6EF4D250:01CE409B] Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Apr 2013 03:25:58 -0000 --_ccfdd842-29ad-4c01-913d-54a64a82d64a_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable There is still the need to define "a while". IMHO=2C for "reliable" tran= sport of the OPEN that could survive a routing transient=2C we are talking = about roughly 30 seconds or 5 re-transmissions. If we assume that only th= e OPEN is lost (no losses in the data)=2C required buffer =3D Timeout * mi= n(RWIN=2C CWIN)/RTT . This may not be small number.=20 Example: Timeout =3D 30 seconds=2C min (CWIN=2C RWIN) =3D 16 KB=2C RTT =3D = 50 ms=2C buffer =3D 30 second * 16 KB/50 ms =3D 9.6 MB From: pthatcher@google.com Date: Tue=2C 23 Apr 2013 11:17:23 -0700 To: martin.thomson@gmail.com CC: randell-ietf@jesup.org=3B rtcweb@ietf.org Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN Based on feedback=2C it sounds like we're basically narrowing this down to = "buffer for a while and then fire an error locally without giving the data = to JS=2C and close the stream so the remote side knows". That sounds prett= y good to me. =0A= =0A= On Fri=2C Apr 19=2C 2013 at 12:12 PM=2C Peter Thatcher wrote: =0A= =0A= I like all the discussion=2C but I feel like we need to get back to the que= stion and what options we have. The question: "what does the browser do wi= th unexpected data (before an open of an unregistered sid)?"=0A= =0A= =0A= =0A= 1. Buffer forever without limits: Randell thinks it's OK to buffer forever= without limits. Martin disagrees. I disagree (I agree with Martin).2. Bu= ffer with limits=2C and then:=0A= a. Hand an error to JS saying "got some data for a data channel=2C but a= n OPEN never came" WITHOUT providing the data to JS: Harald likes this. I'= m OK with this. b. Hand an error to JS saying "got some data for a data c= hannel=2C but an OPEN never came" WITH providing the data: I like this bett= er=2C since I don't see a reason not to give JS the data. =0A= =0A= =0A= =0A= c. Fire .ondatachannel: This is what I was was originally thinking=2C bu= t I understand the downsides mentioned=2C and would be happy with (b) inste= ad.=20 Right now=2C it seems like 2a or 2b is our best options=2C mixed with reset= ting the stream. In other words=2C if I'm a browser=2C I'd do something li= ke:=0A= =0A= =0A= =0A= function handle_data(sid=2C data) { if (is_open_message(data)) { var info =3D get_stream_info(data) var= buffered_data =3D clear_buffer(sid) fire_ondatachannel(sid=2C info)=0A= =0A= =0A= fire_ondata(sid=2C buffered_data)=0A= } else if (has_known_stream(sid)) { fire_ondata(sid=2C data) } else i= f (buffer_has_space(sid)) { add_to_buffer(sid=2C data) } else {=0A= var buffered_data =3D clear_buffer(sid) fire_unknownchannelerror_in_= js(sid=2C buffered_data) reset_stream(sid) } } =0A= Are there other options I'm missing or didn't understand? On Fri=2C Apr 19=2C 2013 at 11:11 AM=2C Martin Thomson wrote: =0A= =0A= =0A= =0A= On 19 April 2013 09:39=2C Randell Jesup wrote: =0A= =0A= =0A= =0A= =0A= > the Open *will* eventually get through unless you have =0A= > 100% (or virtually so) packet loss =0A= =0A= I'm going to pretend you didn't say that. If you want to talk odds=2C =0A= that's fine=2C but I think that you'll find that this sort of error is =0A= far more likely than you realize. We're talking the probability of =0A= incoming data exceeding a given threshold prior to an open being =0A= delivered. After all=2C unless you have 0% loss=2C the *possible* maximum =0A= amount of data is infinite. Though large numbers might be of =0A= relatively low probability on an individual basis=2C operating at scale =0A= you are going to encounter surprising spikes. =0A= =0A= > I honestly feel it's ok to just buffer all incoming packets while waiting= for the Open. =0A= =0A= That's not a warm fuzzy that I share. =0A= =0A= > No one is going to get a gigabyte of data in without an Open... A =0A= > non-browser could fake up a session and start sending data without ever =0A= > sending an Open... but flushing the data doesn't actually help you agains= t =0A= > that sort of active DOS (they can just start again=2C they can spread it =0A= > across thousands of channels=2C etc=2C etc)=2C and there are FAR better D= OS =0A= > methods - all this would do is burn some CPU and some memory. =0A= =0A= I think that would be a mistake. This isn't about denial of service=2C =0A= it's about genuine usage cases that encounter errors. The receiver =0A= can't use the receive window to apply back pressure if they are =0A= reading from the stream to look for the open message=2C so you end up =0A= with an unbounded amount of data. The amount of data will scale with =0A= bandwidth delay product. A long=2C fat pipe might burn more CPU and =0A= memory than you are willing to tolerate. =0A= =0A= Then it comes down to what experience you want to provide to the =0A= unfortunates who encounter this problem. =0A= _______________________________________________ =0A= rtcweb mailing list =0A= rtcweb@ietf.org =0A= https://www.ietf.org/mailman/listinfo/rtcweb =0A= =0A= =0A= _______________________________________________=0A= rtcweb mailing list=0A= rtcweb@ietf.org=0A= https://www.ietf.org/mailman/listinfo/rtcweb = --_ccfdd842-29ad-4c01-913d-54a64a82d64a_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
There is still the need to defin= e "a while".  =3B  =3BIMHO=2C for "reliable" transport of the OPEN = that could survive a routing transient=2C we are talking about roughly 30 s= econds or 5 re-transmissions.  =3B If we assume that only the OPEN is l= ost (no losses in the data)=2C  =3Brequired buffer =3D Timeout * min(RW= IN=2C CWIN)/RTT =3B.  =3BThis may not be small number. =3B
=
Example: Timeout =3D 30 seconds=2C min (CWIN=2C RWIN) =3D 16= KB=2C RTT =3D 50 ms=2C  =3Bbuffer =3D 30 second * 16 KB/50 ms =3D 9.6 = MB


From: pthatcher@google.com
Date: Tue=2C 23 Ap= r 2013 11:17:23 -0700
To: martin.thomson@gmail.com
CC: randell-ietf@j= esup.org=3B rtcweb@ietf.org
Subject: Re: [rtcweb] #13: Transport of DATA= _CHANNEL_OPEN

Based on feedback=2C it sounds like w= e're basically narrowing this down to "buffer for a while and then fire an = error locally without giving the data to JS=2C and close the stream so the = remote side knows".  =3BThat sounds pretty good to me.
=0A= =0A=


O= n Fri=2C Apr 19=2C 2013 at 12:12 PM=2C Peter Thatcher <= =3Bpthatcher@goog= le.com>=3B wrote:
=0A= =0A=
I like all the discussion=2C but I fe= el like we need to get back to the question and what options we have.  = =3BThe question: "what does the browser do with unexpected data (before an = open of an unregistered sid)?"
=0A= =0A= =0A= =0A=
1. Buffer forever without limits:  =3BRandell thinks it'= s OK to buffer forever without limits.  =3BMartin disagrees.  =3BI = disagree (I agree with Martin).
2. Buffer with limits=2C and then= :
=0A=
 =3B a.  =3BHand an error to JS saying "got some data for a da= ta channel=2C but an OPEN never came" WITHOUT providing the data to JS: Har= ald likes this.  =3BI'm OK with this.
 =3B b.  =3BHan= d an error to JS saying "got some data for a data channel=2C but an OPEN ne= ver came" WITH providing the data: I like this better=2C since I don't see = a reason not to give JS the data.  =3B
=0A= =0A= =0A= =0A=
 =3B c.  =3BFire .ondatachannel: This is what I was was origin= ally thinking=2C but I understand the downsides mentioned=2C and would be h= appy with (b) instead.
 =3B

Righ= t now=2C it seems like 2a or 2b is our best options=2C mixed with resetting= the stream.  =3BIn other words=2C if I'm a browser=2C I'd do something= like:
=0A= =0A= =0A= =0A=

function handle_data(sid=2C data) {
 = =3B if (is_open_message(data)) {
 =3B  =3B var info =3D g= et_stream_info(data)
 =3B  =3B var buffered_data =3D clea= r_buffer(sid)
 =3B  =3B fire_ondatachannel(sid=2C info)=0A= =0A= =0A=
 =3B  =3B fire_ondata(sid=2C buffered_data)
=0A=
 =3B } else if (has_known_stream(sid)) {
 =3B  = =3B fire_ondata(sid=2C data)
 =3B } else if (buffer_has_space= (sid)) {
 =3B  =3B add_to_buffer(sid=2C data)
&= nbsp=3B } else {
=0A=
 =3B  =3B var buffered_data =3D clear_buffer(sid)
&n= bsp=3B  =3B fire_unknownchannelerror_in_js(sid=2C buffered_data)
<= div> =3B  =3B reset_stream(sid)
 =3B }
= }

=0A=

Are there other options I'm missing or didn't understan= d?



On Fri=2C Apr 19=2C 2013 at 11:11 AM= =2C Martin Thomson <=3Bmartin.thomson@gmail.com>=3B wro= te:
=0A= =0A= =0A= =0A=
On 19 April 2013 09:39=2C Randell Jesup <=3Brandell-ietf@jesup= .org>=3B wrote:
=0A= =0A= =0A= =0A= =0A= >=3B the Open *will* eventually get through unless you have
=0A= >=3B 100% (or virtually so) packet loss
=0A=
=0A=
I'm going to pretend you didn't say that.  =3BIf you want to talk= odds=2C
=0A= that's fine=2C but I think that you'll find that this sort of error is
= =0A= far more likely than you realize.  =3BWe're talking the probability of<= br>=0A= incoming data exceeding a given threshold prior to an open being
=0A= delivered.  =3BAfter all=2C unless you have 0% loss=2C the *possible* m= aximum
=0A= amount of data is infinite.  =3BThough large numbers might be of
=0A= relatively low probability on an individual basis=2C operating at scale
= =0A= you are going to encounter surprising spikes.
=0A=

=0A= >=3B I honestly feel it's ok to just buffer all incoming packets while wa= iting for the Open.
=0A=
=0A=
That's not a warm fuzzy that I share.
=0A=

=0A= >=3B No one is going to get a gigabyte of data in without an Open... &nbs= p=3BA
=0A= >=3B non-browser could fake up a session and start sending data without e= ver
=0A= >=3B sending an Open... but flushing the data doesn't actually help you a= gainst
=0A= >=3B that sort of active DOS (they can just start again=2C they can sprea= d it
=0A= >=3B across thousands of channels=2C etc=2C etc)=2C and there are FAR bet= ter DOS
=0A= >=3B methods - all this would do is burn some CPU and some memory.
=0A=
=0A=
I think that would be a mistake.  =3BThis isn't about denial of s= ervice=2C
=0A= it's about genuine usage cases that encounter errors.  =3BThe receiver<= br>=0A= can't use the receive window to apply back pressure if they are
=0A= reading from the stream to look for the open message=2C so you end up
= =0A= with an unbounded amount of data.  =3BThe amount of data will scale wit= h
=0A= bandwidth delay product.  =3BA long=2C fat pipe might burn more CPU and=
=0A= memory than you are willing to tolerate.
=0A=
=0A= Then it comes down to what experience you want to provide to the
=0A= unfortunates who encounter this problem.
=0A=
_______________________________________________
=0A= rtcweb mailing list
=0A= rtcweb@ietf.org=0A= = https://www.ietf.org/mailman/listinfo/rtcweb
=0A=

=0A=

=0A=
_______________________________________________=0A= rtcweb mailing list=0A= rtcweb@ietf.org=0A= https://www.ietf.org/mailman/listinfo/rtcweb
=
= --_ccfdd842-29ad-4c01-913d-54a64a82d64a_-- From Michael.Tuexen@lurchi.franken.de Tue Apr 23 23:19:19 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EA3A621F8B2B for ; Tue, 23 Apr 2013 23:19:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ij0FxQoRpkNX for ; Tue, 23 Apr 2013 23:19:19 -0700 (PDT) Received: from mail-n.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) by ietfa.amsl.com (Postfix) with ESMTP id BC71121F854F for ; Tue, 23 Apr 2013 23:19:15 -0700 (PDT) Received: from [10.225.1.125] (unknown [194.95.73.101]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTP id 95E0C1C0C0692; Wed, 24 Apr 2013 08:19:13 +0200 (CEST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=us-ascii From: Michael Tuexen In-Reply-To: Date: Wed, 24 Apr 2013 08:19:10 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <516CE3EC.2050804@jesup.org> <516F1AF9.2080301@alvestrand.no> <516F9A5A.6080402@alvestrand.no> <5170247F.4090908@alvestrand.no> <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de> <5171734E.3050300@jesup.org> To: Peter Thatcher X-Mailer: Apple Mail (2.1283) Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Apr 2013 06:19:20 -0000 On Apr 23, 2013, at 8:17 PM, Peter Thatcher wrote: > Based on feedback, it sounds like we're basically narrowing this down = to "buffer for a while and then fire an error locally without giving the = data to JS, and close the stream so the remote side knows". That sounds = pretty good to me. Does the remote side should get any indication that the sent messages = are dropped and not being delivered? Best regards Michael >=20 >=20 > On Fri, Apr 19, 2013 at 12:12 PM, Peter Thatcher = wrote: > I like all the discussion, but I feel like we need to get back to the = question and what options we have. The question: "what does the browser = do with unexpected data (before an open of an unregistered sid)?" >=20 > 1. Buffer forever without limits: Randell thinks it's OK to buffer = forever without limits. Martin disagrees. I disagree (I agree with = Martin). > 2. Buffer with limits, and then: > a. Hand an error to JS saying "got some data for a data channel, = but an OPEN never came" WITHOUT providing the data to JS: Harald likes = this. I'm OK with this. > b. Hand an error to JS saying "got some data for a data channel, = but an OPEN never came" WITH providing the data: I like this better, = since I don't see a reason not to give JS the data. =20 > c. Fire .ondatachannel: This is what I was was originally thinking, = but I understand the downsides mentioned, and would be happy with (b) = instead. > =20 >=20 > Right now, it seems like 2a or 2b is our best options, mixed with = resetting the stream. In other words, if I'm a browser, I'd do = something like: >=20 > function handle_data(sid, data) { > if (is_open_message(data)) { > var info =3D get_stream_info(data) > var buffered_data =3D clear_buffer(sid) > fire_ondatachannel(sid, info) > fire_ondata(sid, buffered_data) > } else if (has_known_stream(sid)) { > fire_ondata(sid, data) > } else if (buffer_has_space(sid)) { > add_to_buffer(sid, data) > } else { > var buffered_data =3D clear_buffer(sid) > fire_unknownchannelerror_in_js(sid, buffered_data) > reset_stream(sid) > } > } >=20 >=20 > Are there other options I'm missing or didn't understand? >=20 >=20 >=20 > On Fri, Apr 19, 2013 at 11:11 AM, Martin Thomson = wrote: > On 19 April 2013 09:39, Randell Jesup wrote: > > the Open *will* eventually get through unless you have > > 100% (or virtually so) packet loss >=20 > I'm going to pretend you didn't say that. If you want to talk odds, > that's fine, but I think that you'll find that this sort of error is > far more likely than you realize. We're talking the probability of > incoming data exceeding a given threshold prior to an open being > delivered. After all, unless you have 0% loss, the *possible* maximum > amount of data is infinite. Though large numbers might be of > relatively low probability on an individual basis, operating at scale > you are going to encounter surprising spikes. >=20 > > I honestly feel it's ok to just buffer all incoming packets while = waiting for the Open. >=20 > That's not a warm fuzzy that I share. >=20 > > No one is going to get a gigabyte of data in without an Open... A > > non-browser could fake up a session and start sending data without = ever > > sending an Open... but flushing the data doesn't actually help you = against > > that sort of active DOS (they can just start again, they can spread = it > > across thousands of channels, etc, etc), and there are FAR better = DOS > > methods - all this would do is burn some CPU and some memory. >=20 > I think that would be a mistake. This isn't about denial of service, > it's about genuine usage cases that encounter errors. The receiver > can't use the receive window to apply back pressure if they are > reading from the stream to look for the open message, so you end up > with an unbounded amount of data. The amount of data will scale with > bandwidth delay product. A long, fat pipe might burn more CPU and > memory than you are willing to tolerate. >=20 > Then it comes down to what experience you want to provide to the > unfortunates who encounter this problem. > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb >=20 >=20 > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From Michael.Tuexen@lurchi.franken.de Tue Apr 23 23:24:11 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 97BA521F86B2 for ; Tue, 23 Apr 2013 23:24:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.299 X-Spam-Level: X-Spam-Status: No, score=-2.299 tagged_above=-999 required=5 tests=[AWL=-0.300, BAYES_00=-2.599, J_CHICKENPOX_34=0.6] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2IcCp1BoDvzK for ; Tue, 23 Apr 2013 23:24:11 -0700 (PDT) Received: from mail-n.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) by ietfa.amsl.com (Postfix) with ESMTP id 925A921F8630 for ; Tue, 23 Apr 2013 23:24:10 -0700 (PDT) Received: from [10.225.1.125] (unknown [194.95.73.101]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTP id BA3021C0C0692; Wed, 24 Apr 2013 08:24:09 +0200 (CEST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=iso-8859-1 From: Michael Tuexen In-Reply-To: Date: Wed, 24 Apr 2013 08:24:10 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org>, <516CE3EC.2050804@jesup.org>, , , , <516F1AF9.2080301@alvestrand.no>, , <516F9A5A.6080402@alvestrand.no>, , <5170247F.4090908@alvestrand.no>, , <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de>, , <5171734E.3050300@jesup.org>, , , To: Bernard Aboba X-Mailer: Apple Mail (2.1283) Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Apr 2013 06:24:11 -0000 On Apr 24, 2013, at 5:25 AM, Bernard Aboba wrote: > There is still the need to define "a while". IMHO, for "reliable" = transport of the OPEN that could survive a routing transient, we are = talking about roughly 30 seconds or 5 re-transmissions. If we assume = that only the OPEN is lost (no losses in the data), required buffer =3D = Timeout * min(RWIN, CWIN)/RTT . This may not be small number.=20 >=20 > Example: Timeout =3D 30 seconds, min (CWIN, RWIN) =3D 16 KB, RTT =3D = 50 ms, buffer =3D 30 second * 16 KB/50 ms =3D 9.6 MB I guess you are considering the case where the OPEN message was dropped = by the network multiple times... The sender and receiver normally bound the memory for processing data = (socket buffers). So your above only applies if the send buffer is larger than 9.6 MB. Ofter, = the send and receiver buffer are the same and reflect the RWIN, so you are = considering on the receiver side a 16 KB buffer, on the sender side a 10 MB buffer. The sender can not delete message sent after the OPEN message, since = they can be reneged at the SCTP layer. Best regards Michael >=20 >=20 > From: pthatcher@google.com > Date: Tue, 23 Apr 2013 11:17:23 -0700 > To: martin.thomson@gmail.com > CC: randell-ietf@jesup.org; rtcweb@ietf.org > Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN >=20 > Based on feedback, it sounds like we're basically narrowing this down = to "buffer for a while and then fire an error locally without giving the = data to JS, and close the stream so the remote side knows". That sounds = pretty good to me. >=20 >=20 > On Fri, Apr 19, 2013 at 12:12 PM, Peter Thatcher = wrote: > I like all the discussion, but I feel like we need to get back to the = question and what options we have. The question: "what does the browser = do with unexpected data (before an open of an unregistered sid)?" >=20 > 1. Buffer forever without limits: Randell thinks it's OK to buffer = forever without limits. Martin disagrees. I disagree (I agree with = Martin). > 2. Buffer with limits, and then: > a. Hand an error to JS saying "got some data for a data channel, = but an OPEN never came" WITHOUT providing the data to JS: Harald likes = this. I'm OK with this. > b. Hand an error to JS saying "got some data for a data channel, = but an OPEN never came" WITH providing the data: I like this better, = since I don't see a reason not to give JS the data. =20 > c. Fire .ondatachannel: This is what I was was originally thinking, = but I understand the downsides mentioned, and would be happy with (b) = instead. > =20 >=20 > Right now, it seems like 2a or 2b is our best options, mixed with = resetting the stream. In other words, if I'm a browser, I'd do = something like: >=20 > function handle_data(sid, data) { > if (is_open_message(data)) { > var info =3D get_stream_info(data) > var buffered_data =3D clear_buffer(sid) > fire_ondatachannel(sid, info) > fire_ondata(sid, buffered_data) > } else if (has_known_stream(sid)) { > fire_ondata(sid, data) > } else if (buffer_has_space(sid)) { > add_to_buffer(sid, data) > } else { > var buffered_data =3D clear_buffer(sid) > fire_unknownchannelerror_in_js(sid, buffered_data) > reset_stream(sid) > } > } >=20 >=20 > Are there other options I'm missing or didn't understand? >=20 >=20 >=20 > On Fri, Apr 19, 2013 at 11:11 AM, Martin Thomson = wrote: > On 19 April 2013 09:39, Randell Jesup wrote: > > the Open *will* eventually get through unless you have > > 100% (or virtually so) packet loss >=20 > I'm going to pretend you didn't say that. If you want to talk odds, > that's fine, but I think that you'll find that this sort of error is > far more likely than you realize. We're talking the probability of > incoming data exceeding a given threshold prior to an open being > delivered. After all, unless you have 0% loss, the *possible* maximum > amount of data is infinite. Though large numbers might be of > relatively low probability on an individual basis, operating at scale > you are going to encounter surprising spikes. >=20 > > I honestly feel it's ok to just buffer all incoming packets while = waiting for the Open. >=20 > That's not a warm fuzzy that I share. >=20 > > No one is going to get a gigabyte of data in without an Open... A > > non-browser could fake up a session and start sending data without = ever > > sending an Open... but flushing the data doesn't actually help you = against > > that sort of active DOS (they can just start again, they can spread = it > > across thousands of channels, etc, etc), and there are FAR better = DOS > > methods - all this would do is burn some CPU and some memory. >=20 > I think that would be a mistake. This isn't about denial of service, > it's about genuine usage cases that encounter errors. The receiver > can't use the receive window to apply back pressure if they are > reading from the stream to look for the open message, so you end up > with an unbounded amount of data. The amount of data will scale with > bandwidth delay product. A long, fat pipe might burn more CPU and > memory than you are willing to tolerate. >=20 > Then it comes down to what experience you want to provide to the > unfortunates who encounter this problem. > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb >=20 >=20 >=20 > _______________________________________________ rtcweb mailing list = rtcweb@ietf.orghttps://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From magnus.westerlund@ericsson.com Wed Apr 24 00:44:10 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BA72C21F85D7 for ; Wed, 24 Apr 2013 00:44:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.125 X-Spam-Level: X-Spam-Status: No, score=-106.125 tagged_above=-999 required=5 tests=[AWL=0.124, BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uz8ztsA2rRjZ for ; Wed, 24 Apr 2013 00:44:10 -0700 (PDT) Received: from mailgw2.ericsson.se (mailgw2.ericsson.se [193.180.251.37]) by ietfa.amsl.com (Postfix) with ESMTP id 89BC521F8F63 for ; Wed, 24 Apr 2013 00:44:05 -0700 (PDT) X-AuditID: c1b4fb25-b7f366d000004d10-cf-51778d43c1d9 Received: from esessmw0247.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw2.ericsson.se (Symantec Mail Security) with SMTP id 17.27.19728.34D87715; Wed, 24 Apr 2013 09:44:04 +0200 (CEST) Received: from [127.0.0.1] (153.88.115.8) by esessmw0247.eemea.ericsson.se (153.88.115.94) with Microsoft SMTP Server id 8.3.279.1; Wed, 24 Apr 2013 09:44:03 +0200 Message-ID: <51778D44.3000605@ericsson.com> Date: Wed, 24 Apr 2013 09:44:04 +0200 From: Magnus Westerlund User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: Peter Thatcher References: <516328C9.7070506@jesup.org> <516FBF34.1070500@ericsson.com> <517545DE.5060208@ericsson.com> In-Reply-To: X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrBLMWRmVeSWpSXmKPExsUyM+Jvra5Lb3mgwfcnbBb7l1xmtjhx4zSz xbXlr1ktzm7Lslj7r53dgdVjwaZSj8c9Z9g8liz5yeTxYfk6tgCWKC6blNSczLLUIn27BK6M pT3P2AuWKVQ8X9XC2sD4XKyLkZNDQsBEYuasLkYIW0ziwr31bF2MXBxCAqcYJSat2MgM4Sxn lHh0aztYFa+AtsSlm6vZQGwWAVWJT30zwGw2AQuJmz8agWwODlGBYImtrTEQ5YISJ2c+YQGx RQQ0JSZPbmYFmckssIxRYsvyRWAJYQEHieb+s+wQyyYzS2w5+oMVZBCnQKDEqq/FENdJSmx5 0c4OYjMDDWrd/hvKlpdo3jqbGcQWArqtoamDdQKj0Cwku2chaZmFpGUBI/MqRvbcxMyc9HKj TYzA0D645bfqDsY750QOMUpzsCiJ84a7XggQEkhPLEnNTk0tSC2KLyrNSS0+xMjEwSnVwKgY ympSoHm16+EJbs0j4SHm5e77m6d/i7vVvfSWwNLtrP//as47lbiyOf7GgmsvjW6U+st+ae51 ZVrid25L2LeO8nmHdCZf/VpttLsxor8lu/UPlzsba4j489LZtke8AzK5r6+XeCNyv2DS342r 13K4s6tuSq26oiB66JjQry9tM7mO6FnKvVViKc5INNRiLipOBAB2V4YHOwIAAA== Cc: Harald Alvestrand , Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] Minutes for the Data Channel Presentations X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Apr 2013 07:44:10 -0000 Ok, so what do you want me to put in the minutes? Do you consider this to be captured in the slide set, or some slides or in the actual draft? Just want to be clear and maybe discourage these blanket +1 or I support statements on the mic without making clear what one supports. Cheers Magnus On 2013-04-23 20:05, Peter Thatcher wrote: > I support the proposal that we agreed to in Orlando, and which includes > what Harald just said: > > - SCTP is in SDP only to set up the transport, and individual data > channels are not mentioned in the SDP. > - The send and receive SID are the same for a given data channel. > - The JS can specify the SID, and an even/odd mechanism is used by the > browser for selecting the SID if not chosen by the JS. > - There is an in-band "OPEN" message, but it is optional. > > That's what I support. > > > On Mon, Apr 22, 2013 at 3:22 PM, Harald Alvestrand > wrote: > > It clearly wasn't clear to Bernard either :-) > > I supported what draft-jesup was suggesting - negotiating usage of > SCTP in SDP, and not mentioning individual data channels in the SDP. > > > > On Mon, Apr 22, 2013 at 4:14 PM, Magnus Westerlund > > wrote: > > Harald and Peter, > > Can you bring any clarity on what you supported? > > Cheers > > Magnus > > On 2013-04-20 03:04, Bernard Aboba wrote: > > Magnus said: > > > >> I have now updated the minutes trying to clarify the context > and the > >> corrections. Please check if you think this makes it clearer. > If not I > >> am happy to introduce additional clarifications, but please > be explicit > >> about what should be changed. > >> > >> http://www.ietf.org/proceedings/86/minutes/minutes-86-rtcweb > >> > > > > > > Peter Thatcher commented that he thinks the presenter's proposal > > (draft­jesup­rtcweb­data­protocol­04) is great. > > > > [BA] My impression was that this remark more related to the > presentation > > suggestions relating to removing of stream negotiation from > SDP, which > > isn't covered in draft-jesup-rtcweb-data-protocol-04. > > > > Harald Alvestrand stated that he Agree with this. Glad got > data channel > > negotiation out of the document. > > > > [BA] Since draft-jesup-rtcweb-data-protocol is about setting > up data > > channels this doesn't make sense to me. Was Harald perhaps > referring to > > getting data channel negotiation "out of SDP"? > > > > > > > > > > > -- > > Magnus Westerlund > > ---------------------------------------------------------------------- > Multimedia Technologies, Ericsson Research EAB/TVM > ---------------------------------------------------------------------- > Ericsson AB | Phone +46 10 7148287 > > Färögatan 6 | Mobile +46 73 0949079 > > SE-164 80 Stockholm, Sweden| mailto: > magnus.westerlund@ericsson.com > > ---------------------------------------------------------------------- > > > -- Magnus Westerlund ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- From magnus.westerlund@ericsson.com Wed Apr 24 00:51:00 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 67E2221F8D79 for ; Wed, 24 Apr 2013 00:51:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.132 X-Spam-Level: X-Spam-Status: No, score=-106.132 tagged_above=-999 required=5 tests=[AWL=0.117, BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id u2r6qgkbi3-4 for ; Wed, 24 Apr 2013 00:50:59 -0700 (PDT) Received: from mailgw7.ericsson.se (mailgw7.ericsson.se [193.180.251.48]) by ietfa.amsl.com (Postfix) with ESMTP id 26A4F21F8D2E for ; Wed, 24 Apr 2013 00:50:58 -0700 (PDT) X-AuditID: c1b4fb30-b7f266d000000cb5-ed-51778ee216cb Received: from esessmw0191.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw7.ericsson.se (Symantec Mail Security) with SMTP id 06.94.03253.2EE87715; Wed, 24 Apr 2013 09:50:58 +0200 (CEST) Received: from [127.0.0.1] (153.88.115.8) by esessmw0191.eemea.ericsson.se (153.88.115.85) with Microsoft SMTP Server id 8.3.279.1; Wed, 24 Apr 2013 09:50:57 +0200 Message-ID: <51778EE1.8080505@ericsson.com> Date: Wed, 24 Apr 2013 09:50:57 +0200 From: Magnus Westerlund User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: "Mo Zanaty (mzanaty)" References: <066.4c5db43349d3176acaa90d17617a02d6@trac.tools.ietf.org> <5173ECC7.7020909@jitsi.org> <51754363.3090300@ericsson.com> <201304222215.r3MMFqsE3199256@shell01.TheWorld.com> <201304231858.r3NIw4OJ3260483@shell01.TheWorld.com> <3879D71E758A7E4AA99A35DD8D41D3D90F6DB734@xmb-rcd-x14.cisco.com> In-Reply-To: <3879D71E758A7E4AA99A35DD8D41D3D90F6DB734@xmb-rcd-x14.cisco.com> X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprJLMWRmVeSWpSXmKPExsUyM+Jvre6jvvJAg1XvRS1ePJjDZLH2Xzu7 xcsTZQ7MHpP3f2X2mPJ7I6vHkiU/mQKYo7hsUlJzMstSi/TtErgyzk+dyVqwQLGi4+UjlgbG 71JdjJwcEgImEpuXzmGGsMUkLtxbz9bFyMUhJHCKUWLn50lQznJGiRfLNrCCVPEKaEvsv/6I BcRmEVCVeP3jPpjNJmAhcfNHI1ADB4eoQLDE1tYYiHJBiZMzn4CViAjoSrz7/YwRpIRZIFBi yXcTkLCwgJnEyU2LWCBWbWOWOHlgNjtIglPAV6Jl/x0WiOMkJba8aAeLMwvoSUy52sIIYctL NG+dDfaAENBpDU0drBMYhWYhWT0LScssJC0LGJlXMbLnJmbmpJebb2IEBu/BLb8NdjBuui92 iFGag0VJnDfc9UKAkEB6YklqdmpqQWpRfFFpTmrxIUYmDk6pBsZuu8Kcazcm3g3Z6RCkGqp1 QOqZ6xQTlS0xZ072v3J1tNmjViR597nLpnwZJY6T2ldaogrvTL3+kH3punXvOfbv2r41aJXj siSmmxNbBdfLON4Razi/JM96Rpe/pEXLoaQnHYI5M2UfBly4uM839OSJ5QKmMVeitl/yulrN x27Sf9wkfkG560klluKMREMt5qLiRAAJzaIWLAIAAA== Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #15: Section 4.8: SSRC signaling X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Apr 2013 07:51:00 -0000 Thanks, I fully support this argument, why you can't start using the PT as an identifier to which purpose or specific negotiated set of constraints within a common RTP session this SSRC relates to. I would however note that this discussion would be better to hold on the MMUSIC list, especially as it does apply to a statement in BUNDLE which I believe must be changed: Se Section 7.2 of draft-ietf-mmusic-sdp-bundle-negotiation-03 o - The dynamic payload type values used in the "m=" lines MUST NOT overlap. This restriction I think must be changed. I will now forward this email to MMUSIC as comment on BUNDLE. Cheers Magnus On 2013-04-23 23:03, Mo Zanaty (mzanaty) wrote: > You can easily exhaust the dynamic payload type number space (96-127) > with only a few media lines, not 30. Keep in mind the primary purpose > of payload type is to negotiate codecs, not demux different streams. > An offer from a highly interoperable product will contain many > payload types for each stream. It is not uncommon to support 8+ > payload types and 4+ streams, which quickly exhausts the dynamic > space. Also keep in mind that many codecs have different > configurations that are expressed as different payload types, so even > supporting a single audio and video codec can yield many payload > types if those codecs are highly configurable. > > Consider a very simple product (smartphone) in a very simple use case > (3-way video chat). It supports several audio codecs (OPUS, AAC-LD, > AMR-WB, AMR-NB, G.711) and several video codecs (VP8, VP9, H.264, > H.265). It supports several H.264 profiles (BP, HP, SBP, SHP) and > packetization modes (0, 1). This already exhausts all 32 dynamic > payload types, before we even consider things like FEC, scalable or > simulcast layers sent via MST, screen sharing, multiple cameras, > etc. > > So I would strongly discourage folks from assuming payload type demux > is viable in most use cases. It may be viable when there is a single > audio and video stream, each using a single codec and configuration. > But it quickly becomes impractical or impossible when the product > gets more capable or the use case gets more interesting. > > Mo > > > -----Original Message----- From: rtcweb-bounces@ietf.org > [mailto:rtcweb-bounces@ietf.org] On Behalf Of Dale R. Worley Sent: > Tuesday, April 23, 2013 2:58 PM To: rtcweb@ietf.org Subject: Re: > [rtcweb] #15: Section 4.8: SSRC signaling > >> From: Martin Thomson >> >> On 22 April 2013 15:15, Dale R. Worley wrote: >>> My understanding is that associating an incoming RTP packet with >>> an m= line is a solved problem -- the transport association on >>> which the packet arrives determines the bundle, and (within all >>> of the currently active bundling proposals) the payload type >>> tells which m= line within the bundle. >> >> Not so. If you have five PTs on each m= line, and 30 m= lines, >> you just don't have that many PTs available. At some point you >> have to recognize that SSRC is what you have to use. (Neither >> number is extraordinary.) > > But why would you use 30 m= lines? You'd only have 30 streams in a > videoconference-type situation, where the streams don't have > distinct roles and so don't need to be given role labels. As far as > I know, current videoconference systems don't put each video stream > in a separate m= line. > > Dale _______________________________________________ rtcweb mailing > list rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ rtcweb mailing list > rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb > > -- Magnus Westerlund ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- From bernard_aboba@hotmail.com Wed Apr 24 07:03:29 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6B6A521F9305 for ; Wed, 24 Apr 2013 07:03:29 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.507 X-Spam-Level: X-Spam-Status: No, score=-102.507 tagged_above=-999 required=5 tests=[AWL=0.091, BAYES_00=-2.599, HTML_MESSAGE=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xbG1EKtaO9uj for ; Wed, 24 Apr 2013 07:03:28 -0700 (PDT) Received: from blu0-omc1-s31.blu0.hotmail.com (blu0-omc1-s31.blu0.hotmail.com [65.55.116.42]) by ietfa.amsl.com (Postfix) with ESMTP id B717221F92C5 for ; Wed, 24 Apr 2013 07:03:28 -0700 (PDT) Received: from BLU169-W73 ([65.55.116.9]) by blu0-omc1-s31.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Wed, 24 Apr 2013 07:03:28 -0700 X-EIP: [v+Tf1JvP7Yze/hSafM8lhU8/VdlBfPll] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: multipart/alternative; boundary="_3aabc3c5-82d2-40a5-bf31-11f1ed351705_" From: Bernard Aboba To: Michael Tuexen Date: Wed, 24 Apr 2013 07:03:28 -0700 Importance: Normal In-Reply-To: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org>, <516CE3EC.2050804@jesup.org>, , , , <516F1AF9.2080301@alvestrand.no>, , <516F9A5A.6080402@alvestrand.no>, , <5170247F.4090908@alvestrand.no>, , <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de>, , <5171734E.3050300@jesup.org>, , , , MIME-Version: 1.0 X-OriginalArrivalTime: 24 Apr 2013 14:03:28.0670 (UTC) FILETIME=[7EF7F3E0:01CE40F4] Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Apr 2013 14:03:29 -0000 --_3aabc3c5-82d2-40a5-bf31-11f1ed351705_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Michael said: > I guess you are considering the case where the OPEN message was dropped b= y the network multiple times... [BA] Right. That's the case in which the d= etails of the OPEN transport makes a difference. =20 > The sender and receiver normally bound the memory for processing data (so= cket buffers). So > your above only applies if the send buffer is larger than 9.6 MB. [BA] T= he assumption is that the receiving application processes the incoming data= =2C so that the RWIN does not decrease. If the data is sent unordered and = unreliable=2C and is acknowledged by SACK chunks (e.g. only the OPEN is los= t)=2C the sender can send this much data (assuming that it has that much to= send). > Often=2C the send and receiver buffer are the same and reflect = the RWIN=2C so you are considering on the receiver side a 16 KB buffer=2C o= n the sender side a 10 MB buffer. [BA] No. You can have 16 KB on both side= s and the sender can end up sending this much=2C as long as the data isn't = lost and the receiving application keeps processing it. Because of that th= e RWIN does not limit the sender.=20 = --_3aabc3c5-82d2-40a5-bf31-11f1ed351705_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Michael said:
>=3B I guess = you are considering the case where the OPEN message was dropped by the netw= ork multiple times...
 =3B
[BA] Right. =3B That's the case in= which =3Bthe details of the =3BOPEN transport makes a difference.<= br> =3B
>=3B The sender and receiver normally bound the memory for= processing data (socket buffers). So
>=3B your above only applies if = the send buffer is larger than 9.6 MB.
 =3B
[BA] The assumption = is that the receiving application processes the incoming data=2C so that th= e RWIN =3Bdoes not decrease. =3B If the data is sent unordered and = unreliable=2C and is acknowledged by SACK chunks (e.g. only the OPEN is los= t)=2C the sender can send this much data (assuming that it has that much to= send). =3B
 =3B
>=3B Often=2C the send and =3Breceive= r buffer are the same and reflect the RWIN=2C so you are considering on the= receiver side a 16 KB buffer=2C on the sender side a 10 MB buffer.
&nbs= p=3B
[BA] No. =3B You can have 16 KB on both sides and the sender ca= n end up sending this much=2C as long as the data isn't lost and the receiv= ing application keeps processing it. =3B Because of that the RWIN does = not limit the sender.

 =3B
= --_3aabc3c5-82d2-40a5-bf31-11f1ed351705_-- From matthew@matthew.at Wed Apr 24 08:19:15 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 01E5021F8691 for ; Wed, 24 Apr 2013 08:19:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.43 X-Spam-Level: X-Spam-Status: No, score=-1.43 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_AT=0.424, HOST_EQ_AT=0.745] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TkQZRIfKxR7p for ; Wed, 24 Apr 2013 08:19:13 -0700 (PDT) Received: from where.matthew.at (where.matthew.at [198.202.199.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9AE4521F85EB for ; Wed, 24 Apr 2013 08:19:13 -0700 (PDT) Received: from [10.10.155.2] (unknown [10.10.155.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by where.matthew.at (Postfix) with ESMTP id 7FB811480CA for ; Wed, 24 Apr 2013 08:19:09 -0700 (PDT) Message-ID: <5177F7EE.1010909@matthew.at> Date: Wed, 24 Apr 2013 08:19:10 -0700 From: Matthew Kaufman User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <5174C8D2.40504@matthew.at> In-Reply-To: <5174C8D2.40504@matthew.at> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Apr 2013 15:19:15 -0000 On 4/21/2013 10:21 PM, Matthew Kaufman wrote: > On 4/11/2013 4:04 PM, rtcweb issue tracker wrote: >> #13: Transport of DATA_CHANNEL_OPEN >> >> Comment on draft-jesup-rtcweb-data-protocol: >> >> All DATA_CHANNEL_OPEN messages MUST be sent reliably and in-order. >> >> > > Ok, I've read the document and the whole discussion. > > Why do we need DATA_CHANNEL_OPEN messages? > > I can't understand the value of any of the things in there except > possibly the "Label" field, which is allowed to be empty anyway(?) > Today's additional messages have failed to answer my question above. If there's no answer, then I propose we get rid of it. Matthew Kaufman From michael.tuexen@lurchi.franken.de Wed Apr 24 10:17:02 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 18C8D21F9653 for ; Wed, 24 Apr 2013 10:17:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CJOCCVouhF3u for ; Wed, 24 Apr 2013 10:17:01 -0700 (PDT) Received: from mail-n.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) by ietfa.amsl.com (Postfix) with ESMTP id 0558C21F961E for ; Wed, 24 Apr 2013 10:17:00 -0700 (PDT) Received: from [192.168.1.101] (p508F0F2C.dip0.t-ipconnect.de [80.143.15.44]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTP id 523D81C0C0695; Wed, 24 Apr 2013 19:16:59 +0200 (CEST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=iso-8859-1 From: Michael Tuexen In-Reply-To: Date: Wed, 24 Apr 2013 19:17:00 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org>, <516CE3EC.2050804@jesup.org>, , , , <516F1AF9.2080301@alvestrand.no>, , <516F9A5A.6080402@alvestrand.no>, , <5170247F.4090908@alvestrand.no>, , <206CB075-6754-4578-B623-866E410DACCC@lurchi.franken.de>, , <5171734E.3050300@jesup.org>, , , , To: Bernard Aboba X-Mailer: Apple Mail (2.1283) Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Apr 2013 17:17:02 -0000 On Apr 24, 2013, at 4:03 PM, Bernard Aboba wrote: > Michael said: > > I guess you are considering the case where the OPEN message was = dropped by the network multiple times... > =20 > [BA] Right. That's the case in which the details of the OPEN = transport makes a difference. > =20 > > The sender and receiver normally bound the memory for processing = data (socket buffers). So > > your above only applies if the send buffer is larger than 9.6 MB.=20 > =20 > [BA] The assumption is that the receiving application processes the = incoming data, so that the RWIN does not decrease. If the data is sent = unordered and unreliable, and is acknowledged by SACK chunks (e.g. only = the OPEN is lost), the sender can send this much data (assuming that it = has that much to send). =20 That is right for the receiver. But the sender has to buffer the sent = messages until they are acknowledged by the cumack, not only by SACK gat reports. So if the = OPEN message was lost, it is not acked and no TSN after it can be cumacked, only = gap-acked. That is why the sender can't remove it from its send buffer. So the limiting = point is the send buffer size of the sender, not a buffer on the receiver side. > =20 > > Often, the send and receiver buffer are the same and reflect the = RWIN, so you are considering on the receiver side a 16 KB buffer, on the = sender side a 10 MB buffer. > =20 > [BA] No. You can have 16 KB on both sides and the sender can end up = sending this much, as long as the data isn't lost and the receiving = application keeps processing it. Because of that the RWIN does not = limit the sender.=20 No. If the send buffer is 16 KB, the sender can only hold up to 16 KB = for retransmissions. It has to buffer TSNs, even if they are gap acked since they can be reneged. The only way around this is to use the NR-SACK extension (which allows = to gap ack TSN's indicating that they won't be reneged), but this is not an RFC = yet... Best regards Michael >=20 > =20 From pthatcher@google.com Wed Apr 24 17:18:31 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DCA6121F86EA for ; Wed, 24 Apr 2013 17:18:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -101.977 X-Spam-Level: X-Spam-Status: No, score=-101.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wgDbmaye-aDW for ; Wed, 24 Apr 2013 17:18:30 -0700 (PDT) Received: from mail-ve0-x22d.google.com (mail-ve0-x22d.google.com [IPv6:2607:f8b0:400c:c01::22d]) by ietfa.amsl.com (Postfix) with ESMTP id A47CE21F870F for ; Wed, 24 Apr 2013 17:18:30 -0700 (PDT) Received: by mail-ve0-f173.google.com with SMTP id ox1so1022734veb.4 for ; Wed, 24 Apr 2013 17:18:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=WILiBNa9sUsyjASMXMAkIa2wM4k/AcB0xHCEci975Ws=; b=eM6kA7rzVXFqIJjq/W1MOyFO6IUwFqa4LSS5hsgxQfQv457cj8zVHJX+nD6Vj+1p/l 5cZ5gEBiT72ZUpt3cVICDFhiM2FuDQnRNdCOT4MTnfTqHaKL6K3NTFfbS7joDIKPsmIn AEBNLo2cYa2Eph/1XvXT43PPDOtr15F+lrAi99yq5urlyplaSh5Ct1cFSRcsHyNyfnr5 G5e/WaU+RsLbuuwBKE42ErLouchjZGBxD3vIwL9DGEI0u6zs+EDOLEOla2pAJ8Z2MiM1 YcS5DygW0YRgzazuaLfXK/+MdreiXXn0v+pTuwIpVzkfeNbbQEkDORCQe+B4hyIeNg+j vR1g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:x-gm-message-state; bh=WILiBNa9sUsyjASMXMAkIa2wM4k/AcB0xHCEci975Ws=; b=ZMCuCMq2rHZlHAe3awIprwbqfJOdltTFqB054ofEoyusF3Rt9dl7cwQrKt+0iUdeVn /xR3F0TkuoIFYHnFrH0smQ2fISgwzyr1ZuXMh5omtR+ZMpm87ygOThuV65seFBQ0Sb04 GdsWT5630WVUi2SZElG/U2lDXTJER1J8S2IwEcdmMtl/pNdlXVHKtVejNAzLTe8G52Wf /l0e6wEXIXbDDPwBNYDThAtKAQs7pVaMAds7J7c8l/pkjzxvNCOACKxmzwBq/R1asSzR y9oA4IHX6hMF4QziP0qLbnz41JVORoD4rxk9nvqLbrvkojXfQUsWx1em6xOFAj902he8 niYQ== X-Received: by 10.220.95.10 with SMTP id b10mr26069555vcn.10.1366849109890; Wed, 24 Apr 2013 17:18:29 -0700 (PDT) MIME-Version: 1.0 Received: by 10.58.28.237 with HTTP; Wed, 24 Apr 2013 17:17:49 -0700 (PDT) In-Reply-To: <51778D44.3000605@ericsson.com> References: <516328C9.7070506@jesup.org> <516FBF34.1070500@ericsson.com> <517545DE.5060208@ericsson.com> <51778D44.3000605@ericsson.com> From: Peter Thatcher Date: Wed, 24 Apr 2013 17:17:49 -0700 Message-ID: To: Magnus Westerlund Content-Type: multipart/alternative; boundary=001a11c1d878a8618004db245bc3 X-Gm-Message-State: ALoCoQmZrkhd5KHKAMAFWEri7rqPC69gJIjyPlrlLY/2vbiUy2qWRPnWqvLrJRmzGTYCbCtPFcsF/IMiCMS1bCdPkvCjptrYnZVeqSpuzCu+I6i70FZmMD9bQvwvYSTaaym8xpEz2moXi0ZiuTFN+30QpaWVOtcBgsEqKCk4YxkFIF42MgMhJwMUMlQUaYw8dY1qTtEmy2xf Cc: Harald Alvestrand , Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] Minutes for the Data Channel Presentations X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 00:18:32 -0000 --001a11c1d878a8618004db245bc3 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable I considered the slides to represent what I support. I'll try to be more specific at the mic next time. But I guess if I could go back I would say "I support the symmetric SID, the option for JS to choose the SID, the optional in-band OPEN message, and the fact that SDP only negotiates the existence and transport of data channels, not individual data channels". On Wed, Apr 24, 2013 at 12:44 AM, Magnus Westerlund < magnus.westerlund@ericsson.com> wrote: > Ok, > > so what do you want me to put in the minutes? Do you consider this to be > captured in the slide set, or some slides or in the actual draft? > > Just want to be clear and maybe discourage these blanket +1 or I support > statements on the mic without making clear what one supports. > > Cheers > > Magnus > > On 2013-04-23 20:05, Peter Thatcher wrote: > > I support the proposal that we agreed to in Orlando, and which includes > > what Harald just said: > > > > - SCTP is in SDP only to set up the transport, and individual data > > channels are not mentioned in the SDP. > > - The send and receive SID are the same for a given data channel. > > - The JS can specify the SID, and an even/odd mechanism is used by the > > browser for selecting the SID if not chosen by the JS. > > - There is an in-band "OPEN" message, but it is optional. > > > > That's what I support. > > > > > > On Mon, Apr 22, 2013 at 3:22 PM, Harald Alvestrand > > wrote: > > > > It clearly wasn't clear to Bernard either :-) > > > > I supported what draft-jesup was suggesting - negotiating usage of > > SCTP in SDP, and not mentioning individual data channels in the SDP= . > > > > > > > > On Mon, Apr 22, 2013 at 4:14 PM, Magnus Westerlund > > > > wrote: > > > > Harald and Peter, > > > > Can you bring any clarity on what you supported? > > > > Cheers > > > > Magnus > > > > On 2013-04-20 03:04, Bernard Aboba wrote: > > > Magnus said: > > > > > >> I have now updated the minutes trying to clarify the context > > and the > > >> corrections. Please check if you think this makes it clearer= . > > If not I > > >> am happy to introduce additional clarifications, but please > > be explicit > > >> about what should be changed. > > >> > > >> http://www.ietf.org/proceedings/86/minutes/minutes-86-rtcweb > > >> > > > > > > > > > Peter Thatcher commented that he thinks the presenter's > proposal > > > (draft=C2=ADjesup=C2=ADrtcweb=C2=ADdata=C2=ADprotocol=C2=AD04= ) is great. > > > > > > [BA] My impression was that this remark more related to the > > presentation > > > suggestions relating to removing of stream negotiation from > > SDP, which > > > isn't covered in draft-jesup-rtcweb-data-protocol-04. > > > > > > Harald Alvestrand stated that he Agree with this. Glad got > > data channel > > > negotiation out of the document. > > > > > > [BA] Since draft-jesup-rtcweb-data-protocol is about setting > > up data > > > channels this doesn't make sense to me. Was Harald perhaps > > referring to > > > getting data channel negotiation "out of SDP"? > > > > > > > > > > > > > > > > > > -- > > > > Magnus Westerlund > > > > > ---------------------------------------------------------------------- > > Multimedia Technologies, Ericsson Research EAB/TVM > > > ---------------------------------------------------------------------- > > Ericsson AB | Phone +46 10 7148287 > > > > F=C3=A4r=C3=B6gatan 6 | Mobile +46 73 0949079 > > > > SE-164 80 Stockholm, Sweden| mailto: > > magnus.westerlund@ericsson.com > > > > > ---------------------------------------------------------------------- > > > > > > > > > -- > > Magnus Westerlund > > ---------------------------------------------------------------------- > Multimedia Technologies, Ericsson Research EAB/TVM > ---------------------------------------------------------------------- > Ericsson AB | Phone +46 10 7148287 > F=C3=A4r=C3=B6gatan 6 | Mobile +46 73 0949079 > SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com > ---------------------------------------------------------------------- > > --001a11c1d878a8618004db245bc3 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
I considered the slides to represent what I support. =C2= =A0I'll try to be more specific at the mic next time. =C2=A0But I guess= if I could go back I would say "I support the symmetric SID, the opti= on for JS to choose the SID, the optional in-band OPEN message, and the fac= t that SDP only negotiates the existence and transport of data channels, no= t individual data channels".


On Wed, Apr 2= 4, 2013 at 12:44 AM, Magnus Westerlund <magnus.westerlund@eri= csson.com> wrote:
Ok,

so what do you want me to put in the minutes? Do you consider this to be captured in the slide set, or some slides or in the actual draft?

Just want to be clear and maybe discourage these blanket +1 or I support statements on the mic without making clear what one supports.

Cheers

Magnus

On 2013-04-23 20:05, Peter Thatcher wrote:
> I support the proposal that we agreed to in Orlando, and which include= s
> what Harald just said:
>
> - SCTP is in SDP only to set up the transport, and individual data
> channels are not mentioned in the SDP.
> - The send and receive SID are the same for a given data channel.
> - The JS can specify the SID, and an even/odd mechanism is used by the=
> browser for selecting the SID if not chosen by the JS.
> - There is an in-band "OPEN" message, but it is optional. >
> That's what I support.
>
>
> On Mon, Apr 22, 2013 at 3:22 PM, Harald Alvestrand <hta@google.com
> <mailto:h= ta@google.com>> wrote:
>
> =C2=A0 =C2=A0 It clearly wasn't clear to Bernard either :-)
>
> =C2=A0 =C2=A0 I supported what draft-jesup was suggesting - negotiatin= g usage of
> =C2=A0 =C2=A0 SCTP in SDP, and not mentioning individual data channels= in the SDP.
>
>
>
> =C2=A0 =C2=A0 On Mon, Apr 22, 2013 at 4:14 PM, Magnus Westerlund
> =C2=A0 =C2=A0 <ma= gnus.westerlund@ericsson.com
> =C2=A0 =C2=A0 <mailto:magnus.westerlund@ericsson.com>>= ; wrote:
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 Harald and Peter,
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 Can you bring any clarity on what you supp= orted?
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 Cheers
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 Magnus
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 On 2013-04-20 03:04, Bernard Aboba wrote:<= br> > =C2=A0 =C2=A0 =C2=A0 =C2=A0 > Magnus said:
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 >> I have now updated the minutes tr= ying to clarify the context
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 and the
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 >> corrections. Please check if you = think this makes it clearer.
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 If not I
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 >> am happy to introduce additional = clarifications, but please
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 be explicit
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 >> about what should be changed.
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 >> http://www.ietf.o= rg/proceedings/86/minutes/minutes-86-rtcweb
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 > Peter Thatcher commented that he thin= ks the presenter's proposal
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 > (draft=C2=ADjesup=C2=ADrtcweb=C2=ADda= ta=C2=ADprotocol=C2=AD04) =C2=A0is great.
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 > [BA] My impression was that this rema= rk more related to the
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 presentation
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 > suggestions relating to removing of s= tream negotiation from
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 SDP, which
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 > isn't covered in draft-jesup-rtcw= eb-data-protocol-04.
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 > Harald Alvestrand stated that he Agre= e with this. Glad got
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 data channel
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 > negotiation out of the document.
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 > [BA] =C2=A0Since draft-jesup-rtcweb-d= ata-protocol is about setting
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 up data
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 > channels this doesn't make sense = to me. =C2=A0Was Harald perhaps
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 referring to
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 > getting data channel negotiation &quo= t;out of SDP"?
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
>
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 --
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 Magnus Westerlund
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 ------------------------------------------= ----------------------------
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 Multimedia Technologies, Ericsson Research= EAB/TVM
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 ------------------------------------------= ----------------------------
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 Ericsson AB =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0| Phone =C2=A0+46 10 7148287
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 <tel:%2B46%2010%207148287&g= t;
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 F=C3=A4r=C3=B6gatan 6 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| Mobile +46 73 0949079
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 <tel:%2B46%2073%200949079>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 SE-164 80 Stockholm, Swe= den| mailto:
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 magnus.westerlund@ericsson.com
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 <mailto:magnus.westerlund@ericsson.com>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 ------------------------------------------= ----------------------------
>
>
>


--

Magnus Westerlund

----------------------------------------------------------------------
Multimedia Technologies, Ericsson Research EAB/TVM
----------------------------------------------------------------------
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F=C3=A4r=C3=B6gatan 6 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0| Mobile +46= 73 0949079
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--001a11c1d878a8618004db245bc3-- From pthatcher@google.com Wed Apr 24 17:30:13 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EA50021F8CE9 for ; Wed, 24 Apr 2013 17:30:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.143 X-Spam-Level: X-Spam-Status: No, score=-102.143 tagged_above=-999 required=5 tests=[AWL=-0.833, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1, SARE_HTML_USL_OBFU=1.666, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id R5lXs7z3Qz2A for ; Wed, 24 Apr 2013 17:30:12 -0700 (PDT) Received: from mail-vc0-f178.google.com (mail-vc0-f178.google.com [209.85.220.178]) by ietfa.amsl.com (Postfix) with ESMTP id CBC5C21F8B60 for ; Wed, 24 Apr 2013 17:30:11 -0700 (PDT) Received: by mail-vc0-f178.google.com with SMTP id ib11so2354752vcb.37 for ; Wed, 24 Apr 2013 17:30:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=AGadURBDUGQjptc86Ib3y7sLtoubt8DOT4GdCa7S+yA=; b=ChUVgS4QgDPtn5IRUpiIOsZzCrJCxub5G7/ryErr/0U8xYDxsT6IpNskGY+K1rjq4x eJCYPMLY07dnCweROUHzw6kyVAQIYROlndSEc39p4CC4OFRESfzjGQIMPmfzOxUaP4Ld uexXIGaLM8Jzm+jiTHWYo5b61mARk04F2qv/bYP8KqLXI4lhwvidoaBH4PK70Q8yxsO9 LKBBEdI2bqvJ2NQeiqXQyoUkgHI7LcPwQ9eDwyPIHaoJGkFO4YcHFDm4jjNPCmmkTXgP FCsTybwaujMeEVlHtr2zbTf1lRMn1FdyLTSyxqDa5vBlp2FjPBl/PFgRHPcG2BVI2zhb ecfw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:x-gm-message-state; bh=AGadURBDUGQjptc86Ib3y7sLtoubt8DOT4GdCa7S+yA=; b=E4Q55sdHzjm1OAy1Emyg/mV9LxDgeW/G7/5iquDNnyZrOQn8//GcgK7rwWQKTpAHLw zIEymhu9lkQP3hSlsfqTSkoDh4upDUamawSWtIZmfnxwLEPHdeyQgRmU94HktIPPT+aS mfV05HCOVFH5+JAG6NyJKiIRzrmYTFsZz8XStgc7anFd1PiUjfVuhtyDaDsiEoPuS3Ld +zpJvtvdEAZWUunGTTVO+EN5KFWb5AauaHi47MlGPUc1v3+6H/dNRq2ZPVO/P56Ppa0E x9XqC3JoeGO8AUC6J61ieVZdgzJDSO6RCq10dBqFlrSBm0U9dCPepdypOW1XyX0GysPc BecQ== X-Received: by 10.52.0.102 with SMTP id 6mr21723076vdd.89.1366849811192; Wed, 24 Apr 2013 17:30:11 -0700 (PDT) MIME-Version: 1.0 Received: by 10.58.28.237 with HTTP; Wed, 24 Apr 2013 17:29:31 -0700 (PDT) In-Reply-To: <5177F7EE.1010909@matthew.at> References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <5174C8D2.40504@matthew.at> <5177F7EE.1010909@matthew.at> From: Peter Thatcher Date: Wed, 24 Apr 2013 17:29:31 -0700 Message-ID: To: Matthew Kaufman Content-Type: multipart/alternative; boundary=047d7bacc706756d6b04db2485dc X-Gm-Message-State: ALoCoQmnoDLcTi2sL7Pi1pJyBTL3+lN37vNoA+PPc6oBtrKkmIUU5P+LOMDeedzJYK71RIq+LZtC5OtAzQLF2A5FTooKo1YKNvTgdQE2QQDhS223eTOkc3/p6vWJMoswhnTEzC1EG0Cll56VvF+LrH8zdo+kqz1a87lF1ZNbeHe95DzKWG/v3MQzbgdmeQJ3B+1JvOQNC5vG Cc: "" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 00:30:14 -0000 --047d7bacc706756d6b04db2485dc Content-Type: text/plain; charset=UTF-8 If you propose getting rid of it, you still need to answer the question: what does the browser do with incoming data for an SID that hasn't been registered by the receiver? It's almost the same question. On Wed, Apr 24, 2013 at 8:19 AM, Matthew Kaufman wrote: > On 4/21/2013 10:21 PM, Matthew Kaufman wrote: > >> On 4/11/2013 4:04 PM, rtcweb issue tracker wrote: >> >>> #13: Transport of DATA_CHANNEL_OPEN >>> >>> Comment on draft-jesup-rtcweb-data-**protocol: >>> >>> All DATA_CHANNEL_OPEN messages MUST be sent reliably and in-order. >>> >>> >>> >> Ok, I've read the document and the whole discussion. >> >> Why do we need DATA_CHANNEL_OPEN messages? >> >> I can't understand the value of any of the things in there except >> possibly the "Label" field, which is allowed to be empty anyway(?) >> >> > Today's additional messages have failed to answer my question above. If > there's no answer, then I propose we get rid of it. > > > Matthew Kaufman > ______________________________**_________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/**listinfo/rtcweb > --047d7bacc706756d6b04db2485dc Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
If you propose getting rid of it, you still need to answer= the question: =C2=A0what does the browser do with incoming data for an SID= that hasn't been registered by the receiver? =C2=A0It's almost the= same question.


On Wed, Apr 2= 4, 2013 at 8:19 AM, Matthew Kaufman <matthew@matthew.at> wr= ote:
On 4/21/2013 10:21 PM, Mat= thew Kaufman wrote:
On 4/11/2013 4:04 PM, rtcweb issue tracker wrote:
#13: Transport of DATA_CHANNEL_OPEN

=C2=A0 Comment on draft-jesup-rtcweb-data-protocol:

=C2=A0 All DATA_CHANNEL_OPEN messages MUST be sent reliably and in-order.


Ok, I've read the document and the whole discussion.

Why do we need DATA_CHANNEL_OPEN messages?

I can't understand the value of any of the things in there except possi= bly the "Label" field, which is allowed to be empty anyway(?)


Today's additional messages have failed to answer my question above. If= there's no answer, then I propose we get rid of it.


Matthew Kaufman
_______________________________________________
rtcweb mailing list
rtcweb@ietf.org = https://www.ietf.org/mailman/listinfo/rtcweb

--047d7bacc706756d6b04db2485dc-- From matthew.kaufman@skype.net Wed Apr 24 22:28:23 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 234D721F85C0 for ; Wed, 24 Apr 2013 22:28:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Gzya7g-zxZnQ for ; Wed, 24 Apr 2013 22:28:22 -0700 (PDT) Received: from na01-bl2-obe.outbound.protection.outlook.com (mail-bl2lp0211.outbound.protection.outlook.com [207.46.163.211]) by ietfa.amsl.com (Postfix) with ESMTP id 34D3F21F8201 for ; Wed, 24 Apr 2013 22:28:21 -0700 (PDT) Received: from BL2FFO11FD011.protection.gbl (10.173.161.201) by BL2FFO11HUB012.protection.gbl (10.173.161.118) with Microsoft SMTP Server (TLS) id 15.0.675.0; Thu, 25 Apr 2013 05:28:20 +0000 Received: from TK5EX14HUBC102.redmond.corp.microsoft.com (131.107.125.37) by BL2FFO11FD011.mail.protection.outlook.com (10.173.161.17) with Microsoft SMTP Server (TLS) id 15.0.675.0 via Frontend Transport; Thu, 25 Apr 2013 05:28:20 +0000 Received: from TK5EX14MBXC272.redmond.corp.microsoft.com ([169.254.2.242]) by TK5EX14HUBC102.redmond.corp.microsoft.com ([157.54.7.154]) with mapi id 14.02.0318.003; Thu, 25 Apr 2013 05:28:09 +0000 From: "Matthew Kaufman (SKYPE)" To: Peter Thatcher , Matthew Kaufman Thread-Topic: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN Thread-Index: AQHOPxlA0eoj5OmQXUav6vH8B4+ap5jlf/EAgACZxICAAFMXIA== Date: Thu, 25 Apr 2013 05:28:08 +0000 Message-ID: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <5174C8D2.40504@matthew.at> <5177F7EE.1010909@matthew.at> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [157.54.51.33] Content-Type: multipart/alternative; boundary="_000_AE1A6B5FD507DC4FB3C5166F3A05A484162816C1tk5ex14mbxc272r_" MIME-Version: 1.0 X-Forefront-Antispam-Report: CIP:131.107.125.37; CTRY:US; IPV:CAL; IPV:NLI; EFV:NLI; SFV:NSPM; SFS:(189002)(199002)(59766001)(74662001)(50986001)(66066001)(55846006)(76482001)(56776001)(65816001)(81542001)(54316002)(80022001)(69226001)(31966008)(47976001)(49866001)(20776003)(16406001)(74502001)(47446002)(71186001)(81342001)(53806001)(44976003)(54356001)(77982001)(564824004)(51856001)(512874001)(46102001)(63696002)(47736001)(33656001)(56816002)(79102001)(4396001)(6806003)(74366001); DIR:OUT; SFP:; SCL:1; SRVR:BL2FFO11HUB012; H:TK5EX14HUBC102.redmond.corp.microsoft.com; RD:InfoDomainNonexistent; MX:1; A:1; LANG:en; X-OriginatorOrg: microsoft.onmicrosoft.com X-Forefront-PRVS: 0827D7ACB9 Cc: "" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org 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X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fPGJyPg0KcnRjd2Vi IG1haWxpbmcgbGlzdDxicj4NCjxhIGhyZWY9Im1haWx0bzpydGN3ZWJAaWV0Zi5vcmciIHRhcmdl dD0iX2JsYW5rIj5ydGN3ZWJAaWV0Zi5vcmc8L2E+PGJyPg0KPGEgaHJlZj0iaHR0cHM6Ly93d3cu aWV0Zi5vcmcvbWFpbG1hbi9saXN0aW5mby9ydGN3ZWIiIHRhcmdldD0iX2JsYW5rIj5odHRwczov L3d3dy5pZXRmLm9yZy9tYWlsbWFuL2xpc3RpbmZvL3J0Y3dlYjwvYT48bzpwPjwvbzpwPjwvcD4N CjwvZGl2Pg0KPC9kaXY+DQo8L2Rpdj4NCjxwIGNsYXNzPSJNc29Ob3JtYWwiPjxvOnA+Jm5ic3A7 PC9vOnA+PC9wPg0KPC9kaXY+DQo8L2Rpdj4NCjwvZGl2Pg0KPC9ib2R5Pg0KPC9odG1sPg0K --_000_AE1A6B5FD507DC4FB3C5166F3A05A484162816C1tk5ex14mbxc272r_-- From magnus.westerlund@ericsson.com Thu Apr 25 00:36:22 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2900321F912C for ; Thu, 25 Apr 2013 00:36:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.144 X-Spam-Level: X-Spam-Status: No, score=-106.144 tagged_above=-999 required=5 tests=[AWL=0.105, BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id V40l2-1Bgb9a for ; Thu, 25 Apr 2013 00:36:21 -0700 (PDT) Received: from mailgw1.ericsson.se (mailgw1.ericsson.se [193.180.251.45]) by ietfa.amsl.com (Postfix) with ESMTP id 46EE621F8FF2 for ; Thu, 25 Apr 2013 00:36:20 -0700 (PDT) X-AuditID: c1b4fb2d-b7f316d0000028db-68-5178dcf349ab Received: from esessmw0247.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw1.ericsson.se (Symantec Mail Security) with SMTP id EE.E0.10459.3FCD8715; Thu, 25 Apr 2013 09:36:19 +0200 (CEST) Received: from [127.0.0.1] (153.88.115.8) by esessmw0247.eemea.ericsson.se (153.88.115.94) with Microsoft SMTP Server id 8.3.279.1; Thu, 25 Apr 2013 09:36:10 +0200 Message-ID: <5178DCE6.2030705@ericsson.com> Date: Thu, 25 Apr 2013 09:36:06 +0200 From: Magnus Westerlund User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: Peter Thatcher References: <516328C9.7070506@jesup.org> <516FBF34.1070500@ericsson.com> <517545DE.5060208@ericsson.com> <51778D44.3000605@ericsson.com> In-Reply-To: X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrOLMWRmVeSWpSXmKPExsUyM+Jvre7nOxWBBl//C1nsX3KZ2eLEjdPM FteWv2a1OLsty2Ltv3Z2B1aPBZtKPR73nGHzWLLkJ5PHh+Xr2AJYorhsUlJzMstSi/TtErgy du/by1Kw3qpiV9cBpgbGLRpdjJwcEgImErtnrGCFsMUkLtxbzwZiCwmcYpS43FzaxcgFZC9n lPi1oxGsiFdAW2Lpqa9ARRwcLAKqEg9XmICE2QQsJG7+aAQLiwoES2xtjYGoFpQ4OfMJC4gt IqApMXlyMyvISGaBZYwSW5YvAksICzhINPefZYfY9YNZYv/ry8wgCU6BQImZH3oZIY6TlNjy op0dxGYGmtS6/TeULS/RvHU2M8TR2hINTR2sExiFZiFZPgtJyywkLQsYmVcxsucmZuaklxtu YgQG9sEtv3V3MJ46J3KIUZqDRUmcV/NWRaCQQHpiSWp2ampBalF8UWlOavEhRiYOTqkGxqrl chF2XJuWyGwL83xywE5fpeXB+1sXa5e6p+Q1ausHmtw7cGbW+jQxJfs3PuuDb2xZw/8//ybT ZU7/QMkTWSJtnx0zJqae7DHZFj49Or9HscnqmsQcVzn/4qaPszd819iSNG9z59YXMpvjj9he e7JoyWbl1HmSLvlZvjnLsp9vXF0k+vfRWSWW4oxEQy3mouJEADVrKD46AgAA Cc: Harald Alvestrand , Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] Minutes for the Data Channel Presentations X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 07:36:22 -0000 Hi, I have uploaded new minutes with the paragraph in question now reading: Peter Thatcher commented that he thinks the presenter's proposal (draft-jesup-rtcweb-data-protocol-04) is great. (After the meeting Peter has clarified that is was the content of the slides and to be precise “I support the symmetric SID, the option for JS to choose the SID, the optional in-band OPEN message, and the fact that SDP only negotiates the existence and transport of data channels, not individual data channelsâ€.) Harald Alvestrand stated that he Agree with this (Afterwards clarified as: “I supported what draft-jesup was suggesting - negotiating usage of SCTP in SDP, and not mentioning individual data channels in the SDP.â€). Glad got data channel negotiation out of the document. There are no existing implementation this has to interwork with - this is all new. Any protocol has to define how to work on top of this and map. Not RTCWEB business to define this. Are everyone satisfied now? The possibility make any more changes to the minutes closes on the first of May. Cheers Magnus On 2013-04-25 02:17, Peter Thatcher wrote: > I considered the slides to represent what I support. I'll try to be > more specific at the mic next time. But I guess if I could go back I > would say "I support the symmetric SID, the option for JS to choose the > SID, the optional in-band OPEN message, and the fact that SDP only > negotiates the existence and transport of data channels, not individual > data channels". > > > On Wed, Apr 24, 2013 at 12:44 AM, Magnus Westerlund > > > wrote: > > Ok, > > so what do you want me to put in the minutes? Do you consider this to be > captured in the slide set, or some slides or in the actual draft? > > Just want to be clear and maybe discourage these blanket +1 or I support > statements on the mic without making clear what one supports. > > Cheers > > Magnus > > On 2013-04-23 20:05, Peter Thatcher wrote: > > I support the proposal that we agreed to in Orlando, and which > includes > > what Harald just said: > > > > - SCTP is in SDP only to set up the transport, and individual data > > channels are not mentioned in the SDP. > > - The send and receive SID are the same for a given data channel. > > - The JS can specify the SID, and an even/odd mechanism is used by the > > browser for selecting the SID if not chosen by the JS. > > - There is an in-band "OPEN" message, but it is optional. > > > > That's what I support. > > > > > > On Mon, Apr 22, 2013 at 3:22 PM, Harald Alvestrand > > >> wrote: > > > > It clearly wasn't clear to Bernard either :-) > > > > I supported what draft-jesup was suggesting - negotiating usage of > > SCTP in SDP, and not mentioning individual data channels in > the SDP. > > > > > > > > On Mon, Apr 22, 2013 at 4:14 PM, Magnus Westerlund > > > > >> wrote: > > > > Harald and Peter, > > > > Can you bring any clarity on what you supported? > > > > Cheers > > > > Magnus > > > > On 2013-04-20 03:04, Bernard Aboba wrote: > > > Magnus said: > > > > > >> I have now updated the minutes trying to clarify the > context > > and the > > >> corrections. Please check if you think this makes it > clearer. > > If not I > > >> am happy to introduce additional clarifications, but please > > be explicit > > >> about what should be changed. > > >> > > >> > http://www.ietf.org/proceedings/86/minutes/minutes-86-rtcweb > > >> > > > > > > > > > Peter Thatcher commented that he thinks the presenter's > proposal > > > (draft­jesup­rtcweb­data­protocol­04) is great. > > > > > > [BA] My impression was that this remark more related to the > > presentation > > > suggestions relating to removing of stream negotiation from > > SDP, which > > > isn't covered in draft-jesup-rtcweb-data-protocol-04. > > > > > > Harald Alvestrand stated that he Agree with this. Glad got > > data channel > > > negotiation out of the document. > > > > > > [BA] Since draft-jesup-rtcweb-data-protocol is about > setting > > up data > > > channels this doesn't make sense to me. Was Harald perhaps > > referring to > > > getting data channel negotiation "out of SDP"? > > > > > > > > > > > > > > > > > > -- > > > > Magnus Westerlund > > > > > ---------------------------------------------------------------------- > > Multimedia Technologies, Ericsson Research EAB/TVM > > > ---------------------------------------------------------------------- > > Ericsson AB | Phone +46 10 7148287 > > > > > Färögatan 6 | Mobile +46 73 0949079 > > > > > SE-164 80 Stockholm, Sweden| mailto: > > magnus.westerlund@ericsson.com > > > > > > > ---------------------------------------------------------------------- > > > > > > > > > -- > > Magnus Westerlund > > ---------------------------------------------------------------------- > Multimedia Technologies, Ericsson Research EAB/TVM > ---------------------------------------------------------------------- > Ericsson AB | Phone +46 10 7148287 > > Färögatan 6 | Mobile +46 73 0949079 > > SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com > > ---------------------------------------------------------------------- > > -- Magnus Westerlund ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- From fluffy@iii.ca Thu Apr 25 08:57:21 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CE35221F961A for ; Thu, 25 Apr 2013 08:57:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.299 X-Spam-Level: X-Spam-Status: No, score=-2.299 tagged_above=-999 required=5 tests=[AWL=0.300, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LNoxaBwKhhSk for ; Thu, 25 Apr 2013 08:57:21 -0700 (PDT) Received: from mxout-08.mxes.net (mxout-08.mxes.net [216.86.168.183]) by ietfa.amsl.com (Postfix) with ESMTP id 3820321F9619 for ; Thu, 25 Apr 2013 08:57:21 -0700 (PDT) Received: from [192.168.4.100] (unknown [128.107.239.234]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by smtp.mxes.net (Postfix) with ESMTPSA id B37EC50AA2; Thu, 25 Apr 2013 11:57:19 -0400 (EDT) From: Cullen Jennings Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Date: Thu, 25 Apr 2013 09:57:17 -0600 Message-Id: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> To: "rtcweb@ietf.org" Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) X-Mailer: Apple Mail (2.1503) Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 15:57:22 -0000 The working groups committed some time ago to have a further discussion = on whether SDP Security Descriptions (RFC 4568 aka SDES) would be usable = as a keying method for WebRTC. As we prepare for that discussion, we'd = like to have expressions of interest or support for that approach which = indicate the general outlines of support proposed. If you wish to make = such an expression of support, please send it to the chairs or the list. Cullen, Magnus, & Ted From alan.b.johnston@gmail.com Thu Apr 25 09:39:37 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AC7F121F881C for ; Thu, 25 Apr 2013 09:39:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -101.203 X-Spam-Level: X-Spam-Status: No, score=-101.203 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, MIME_QP_LONG_LINE=1.396, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7elP81UR1ABx for ; Thu, 25 Apr 2013 09:39:37 -0700 (PDT) Received: from mail-qa0-x232.google.com (mail-qa0-x232.google.com [IPv6:2607:f8b0:400d:c00::232]) by ietfa.amsl.com (Postfix) with ESMTP id ED8BC21F87C5 for ; Thu, 25 Apr 2013 09:39:36 -0700 (PDT) Received: by mail-qa0-f50.google.com with SMTP id dx4so926563qab.16 for ; Thu, 25 Apr 2013 09:39:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:references:in-reply-to:mime-version:content-type :message-id:content-transfer-encoding:cc:x-mailer:from:subject:date :to; bh=bix/JKckf6Qe/ke+2+jIJdsRGRWNS/azoTXoUN477Gs=; b=DiPj6gdBNdHCiPtcVzAbEVEay1MymcE9/LG1iygo137RlAbZezwjsNo0Xt63qBDFIj p4i9kc+ztwS75oCNyQrKfAepjfQdIuXIXnCqwLMVgcG23CBrxdIBd7NjlbizfkK7e0sZ 2h5qM8nj3hz03Y1titwnUxIbza3jY3h7WEGsr/kX0NTWXq7R3yE10Yhy4F63cCDtGoDE p/vNcOnxMuZl7JH7lKO/+QbrNxAIQ6Ur7oZYNhfU5o8YMG9T13mM/2Gjj+lVnwMiVAj0 cuYh11ifCvK01rVhG3A0U9YuRRf60gtydmR2KKuGzEaoSgO5PSuwp0s2N77wKxNfZznQ BJHw== X-Received: by 10.49.3.6 with SMTP id 6mr14330348qey.64.1366907976504; Thu, 25 Apr 2013 09:39:36 -0700 (PDT) Received: from [10.172.116.17] (mobile-198-228-195-002.mycingular.net. [198.228.195.2]) by mx.google.com with ESMTPSA id ds5sm11634172qab.11.2013.04.25.09.39.34 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 25 Apr 2013 09:39:35 -0700 (PDT) References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> In-Reply-To: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> Mime-Version: 1.0 (1.0) Content-Type: text/plain; charset=us-ascii Message-Id: <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> Content-Transfer-Encoding: quoted-printable X-Mailer: iPhone Mail (9B206) From: Alan Johnston Date: Thu, 25 Apr 2013 12:39:30 -0400 To: Cullen Jennings Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 16:39:37 -0000 I'm not a fan of SDES. However, I've come to believe that we need it for two= reasons.=20 1. There is a backwards compatibility reason. There are deployed systems of S= RTP that use SDES or a key agreement that easily maps to it. Just as we allo= wed G.711 for these systems, it seems reasonable to allow SDES as well. When= combined with ICE Lite in a media gateway, this is a scalable interop appro= ach.=20 2. We need it or something like it for API reasons. There are cases where th= e JavaScript needs to tell the browser what SRTP key to use. Since JSEP uses= SDP for this API surface, SDES works for this. Obviously it is a bad idea t= o send this key over unsecured channels, but this is separate from this API i= ssue.=20 And just to be clear, browser to browser should use DTLS-SRTP, and only thus= mode should be considered "secure" using whatever user interface a browser c= hooses.=20 - Alan - On Apr 25, 2013, at 11:57 AM, Cullen Jennings wrote: >=20 > The working groups committed some time ago to have a further discussion on= whether SDP Security Descriptions (RFC 4568 aka SDES) would be usable as a k= eying method for WebRTC. As we prepare for that discussion, we'd like to ha= ve expressions of interest or support for that approach which indicate the g= eneral outlines of support proposed. If you wish to make such an expression= of support, please send it to the chairs or the list. >=20 > Cullen, Magnus, & Ted >=20 >=20 > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From pthatcher@google.com Thu Apr 25 10:38:01 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C1E2121F8BDD for ; Thu, 25 Apr 2013 10:38:01 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -101.977 X-Spam-Level: X-Spam-Status: No, score=-101.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MKnm7yHYbfuG for ; Thu, 25 Apr 2013 10:38:00 -0700 (PDT) Received: from mail-da0-x22d.google.com (mail-da0-x22d.google.com [IPv6:2607:f8b0:400e:c00::22d]) by ietfa.amsl.com (Postfix) with ESMTP id 992C021F8A18 for ; Thu, 25 Apr 2013 10:38:00 -0700 (PDT) Received: by mail-da0-f45.google.com with SMTP id v40so1531835dad.4 for ; Thu, 25 Apr 2013 10:38:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=ib1GbFSLyWZa7IHtZT+xu9HUvyQ5vGFMHBip8aaiX4U=; b=m5zmgRKtdpxVOG9UAAWoHX5XfdXgkPlOq7eds2cwNR9S7ZvlUD46p7JJjNumqtUd09 IZWXjWTaByrMx54dnRbVyUIOpxld3g+VOg+B5mD76j/lR57whKGdHbCJ9P6UkC5fAjpL HyckjNnbDbCBFuWJRVbqzf5tkwhdZu7o1T+YMDStcldzcWBHwZOfqUHwi/PFZ+2xd4jF SJabDEzUheIyL0a7b9le7K9RYObJ156ck1hLtGUUlKyj9LuGR7rjeUCXvuBPj2O2Hq2Q 0nSupvEONdrwDjC6N5kvlxEbluHX/RA4kVZcnpYls5AZZmwuF3THG7+VgiVyDgIdQB4B Nyqg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:x-gm-message-state; bh=ib1GbFSLyWZa7IHtZT+xu9HUvyQ5vGFMHBip8aaiX4U=; b=CaAMFSRKGntguZxxOe+DgpgI1lUtzn0yHCs4F1QWz28kMQWABhonhxbbrBrot/37vG x318yIFpgYZVSQMHhk3AnVLhtuo9PgipLTsCUw509Pq+pZvOTYTNP13UwKJAdwvHFJkM Fquz9rM9YzglJaBOBm8/AJ7fXTuLBFfkXPX/VlN/FIY4FMu/KyTLU0K9wBYwbsVMvZ1r 9CqLJIiIGQTswlyqYyk7Q5P42f1fTVcQDdYtSjniNKjcr+GdtbkmvrNKpjs2Ae6WxoW5 +45/5qeTvU79ugA4DVxZw/XIdtaXhvVIUZpixpz4uRybeI5CSDDcG7XkQFCJBzEQbmih o76w== X-Received: by 10.66.144.136 with SMTP id sm8mr26291614pab.115.1366911480235; Thu, 25 Apr 2013 10:38:00 -0700 (PDT) MIME-Version: 1.0 Received: by 10.66.228.138 with HTTP; Thu, 25 Apr 2013 10:37:20 -0700 (PDT) In-Reply-To: <5178DCE6.2030705@ericsson.com> References: <516328C9.7070506@jesup.org> <516FBF34.1070500@ericsson.com> <517545DE.5060208@ericsson.com> <51778D44.3000605@ericsson.com> <5178DCE6.2030705@ericsson.com> From: Peter Thatcher Date: Thu, 25 Apr 2013 10:37:20 -0700 Message-ID: To: Magnus Westerlund Content-Type: multipart/alternative; boundary=047d7b6d826e38242b04db32e152 X-Gm-Message-State: ALoCoQnrgbqyERhjsQ7YIqbPDSRBMTQSzCHaRftPyluP+f1Z2GD4miIJLVZuwq9A2B5FDsarawYYcQZRjplb6GhHH7xghauTsVf/qhM90luyGlwOK3fPQvhiYvuXumi6NywXNi1yMkeg63bV4vaMGmPN1ku4HYsAoOb7ENxnQ3544WBploMQqKYdcMeRXbcM1/JUpmiFWojZ Cc: Harald Alvestrand , Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] Minutes for the Data Channel Presentations X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 17:38:01 -0000 --047d7b6d826e38242b04db32e152 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable I'm happy with that. On Thu, Apr 25, 2013 at 12:36 AM, Magnus Westerlund < magnus.westerlund@ericsson.com> wrote: > Hi, > > I have uploaded new minutes with the paragraph in question now reading: > > Peter Thatcher commented that he thinks the presenter's proposal > (draft-jesup-rtcweb-data-protocol-04) is great. (After the meeting > Peter has clarified that is was the content of the slides and to be > precise =E2=80=9CI support the symmetric SID, the option for JS to choose= the > SID, the optional in-band OPEN message, and the fact that SDP only > negotiates the existence and transport of data channels, not individual > data channels=E2=80=9D.) > > Harald Alvestrand stated that he Agree with this (Afterwards clarified > as: =E2=80=9CI supported what draft-jesup was suggesting - negotiating us= age of > SCTP in SDP, and not mentioning individual data channels in the SDP.=E2= =80=9D). > Glad got data channel negotiation out of the document. There are no > existing implementation this has to interwork with - this is all new. > Any protocol has to define how to work on top of this and map. Not > RTCWEB business to define this. > > Are everyone satisfied now? > > The possibility make any more changes to the minutes closes on the first > of May. > > Cheers > > Magnus > > > > On 2013-04-25 02:17, Peter Thatcher wrote: > > I considered the slides to represent what I support. I'll try to be > > more specific at the mic next time. But I guess if I could go back I > > would say "I support the symmetric SID, the option for JS to choose the > > SID, the optional in-band OPEN message, and the fact that SDP only > > negotiates the existence and transport of data channels, not individual > > data channels". > > > > > > On Wed, Apr 24, 2013 at 12:44 AM, Magnus Westerlund > > = > > > wrote: > > > > Ok, > > > > so what do you want me to put in the minutes? Do you consider this > to be > > captured in the slide set, or some slides or in the actual draft? > > > > Just want to be clear and maybe discourage these blanket +1 or I > support > > statements on the mic without making clear what one supports. > > > > Cheers > > > > Magnus > > > > On 2013-04-23 20:05, Peter Thatcher wrote: > > > I support the proposal that we agreed to in Orlando, and which > > includes > > > what Harald just said: > > > > > > - SCTP is in SDP only to set up the transport, and individual dat= a > > > channels are not mentioned in the SDP. > > > - The send and receive SID are the same for a given data channel. > > > - The JS can specify the SID, and an even/odd mechanism is used b= y > the > > > browser for selecting the SID if not chosen by the JS. > > > - There is an in-band "OPEN" message, but it is optional. > > > > > > That's what I support. > > > > > > > > > On Mon, Apr 22, 2013 at 3:22 PM, Harald Alvestrand > > > > >> wrote: > > > > > > It clearly wasn't clear to Bernard either :-) > > > > > > I supported what draft-jesup was suggesting - negotiating > usage of > > > SCTP in SDP, and not mentioning individual data channels in > > the SDP. > > > > > > > > > > > > On Mon, Apr 22, 2013 at 4:14 PM, Magnus Westerlund > > > > > > > > >> wrote: > > > > > > Harald and Peter, > > > > > > Can you bring any clarity on what you supported? > > > > > > Cheers > > > > > > Magnus > > > > > > On 2013-04-20 03:04, Bernard Aboba wrote: > > > > Magnus said: > > > > > > > >> I have now updated the minutes trying to clarify the > > context > > > and the > > > >> corrections. Please check if you think this makes it > > clearer. > > > If not I > > > >> am happy to introduce additional clarifications, but > please > > > be explicit > > > >> about what should be changed. > > > >> > > > >> > > http://www.ietf.org/proceedings/86/minutes/minutes-86-rtcweb > > > >> > > > > > > > > > > > > Peter Thatcher commented that he thinks the presenter's > > proposal > > > > (draft=C2=ADjesup=C2=ADrtcweb=C2=ADdata=C2=ADprotocol= =C2=AD04) is great. > > > > > > > > [BA] My impression was that this remark more related to > the > > > presentation > > > > suggestions relating to removing of stream negotiation > from > > > SDP, which > > > > isn't covered in draft-jesup-rtcweb-data-protocol-04. > > > > > > > > Harald Alvestrand stated that he Agree with this. Glad > got > > > data channel > > > > negotiation out of the document. > > > > > > > > [BA] Since draft-jesup-rtcweb-data-protocol is about > > setting > > > up data > > > > channels this doesn't make sense to me. Was Harald > perhaps > > > referring to > > > > getting data channel negotiation "out of SDP"? > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > > Magnus Westerlund > > > > > > > > > ---------------------------------------------------------------------- > > > Multimedia Technologies, Ericsson Research EAB/TVM > > > > > > ---------------------------------------------------------------------- > > > Ericsson AB | Phone +46 10 7148287 > > > > > > > > F=C3=A4r=C3=B6gatan 6 | Mobile +46 73 0949= 079 > > > > > > > > SE-164 80 Stockholm, Sweden| mailto: > > > magnus.westerlund@ericsson.com > > > > > > > > > > > > > ---------------------------------------------------------------------- > > > > > > > > > > > > > > > -- > > > > Magnus Westerlund > > > > > ---------------------------------------------------------------------- > > Multimedia Technologies, Ericsson Research EAB/TVM > > > ---------------------------------------------------------------------- > > Ericsson AB | Phone +46 10 7148287 > > > > F=C3=A4r=C3=B6gatan 6 | Mobile +46 73 0949079 > > > > SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com > > > > > ---------------------------------------------------------------------- > > > > > > > -- > > Magnus Westerlund > > ---------------------------------------------------------------------- > Multimedia Technologies, Ericsson Research EAB/TVM > ---------------------------------------------------------------------- > Ericsson AB | Phone +46 10 7148287 > F=C3=A4r=C3=B6gatan 6 | Mobile +46 73 0949079 > SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com > ---------------------------------------------------------------------- > > --047d7b6d826e38242b04db32e152 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
I'm happy with that.
<= br>
On Thu, Apr 25, 2013 at 12:36 AM, Magnus = Westerlund <magnus.westerlund@ericsson.com> wro= te:
Hi,

I have uploaded new minutes with the paragraph in question now reading:

Peter Thatcher commented that he thinks the presenter's proposal
(draft-jesup-rtcweb-data-protocol-04) =C2=A0is great. (After the meet= ing
Peter has clarified that is was the content of the slides and to be
precise =E2=80=9CI support the symmetric SID, the option for JS to choose t= he
SID, the optional in-band OPEN message, and the fact that= SDP only
negotiates the existence and transport of data channels, not individual
data channels=E2=80=9D.)

Harald Alvestrand stated that he Agree with this (Afterwards clarified
as: =E2=80=9CI supported what draft-jesup was suggesting - negotiating usag= e of
SCTP in SDP, and not mentioning individual data channels in the SDP.=E2=80= =9D).
Glad got data channel negotiation out of the document. There are no
existing implementation this has to interwork with - this is all new.
Any protocol has to define how to work on top of this and map. Not
RTCWEB business to define this.

Are everyone satisfied now?

The possibility make any more changes to the minutes closes on the first of May.

Cheers

Magnus



On 2013-04-25 02:17, Peter Thatcher wrote:
> I considered the slides to represent what I support. =C2=A0I'll tr= y to be
> more specific at the mic next time. =C2=A0But I guess if I could go ba= ck I
> would say "I support the symmetric SID, the option for JS to choo= se the
> SID, the optional in-band OPEN message, and the fact that SDP only
> negotiates the existence and transport of data channels, not individua= l
> data channels".
>
>
> On Wed, Apr 24, 2013 at 12:44 AM, Magnus Westerlund
> <magnus.wes= terlund@ericsson.com <mailto:magnus.westerlund@ericsson.com>>
> wrote:
>
> =C2=A0 =C2=A0 Ok,
>
> =C2=A0 =C2=A0 so what do you want me to put in the minutes? Do you con= sider this to be
> =C2=A0 =C2=A0 captured in the slide set, or some slides or in the actu= al draft?
>
> =C2=A0 =C2=A0 Just want to be clear and maybe discourage these blanket= +1 or I support
> =C2=A0 =C2=A0 statements on the mic without making clear what one supp= orts.
>
> =C2=A0 =C2=A0 Cheers
>
> =C2=A0 =C2=A0 Magnus
>
> =C2=A0 =C2=A0 On 2013-04-23 20:05, Peter Thatcher wrote:
> =C2=A0 =C2=A0 > I support the proposal that we agreed to in Orlando= , and which
> =C2=A0 =C2=A0 includes
> =C2=A0 =C2=A0 > what Harald just said:
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > - SCTP is in SDP only to set up the transport, and = individual data
> =C2=A0 =C2=A0 > channels are not mentioned in the SDP.
> =C2=A0 =C2=A0 > - The send and receive SID are the same for a given= data channel.
> =C2=A0 =C2=A0 > - The JS can specify the SID, and an even/odd mecha= nism is used by the
> =C2=A0 =C2=A0 > browser for selecting the SID if not chosen by the = JS.
> =C2=A0 =C2=A0 > - There is an in-band "OPEN" message, but= it is optional.
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > That's what I support.
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > On Mon, Apr 22, 2013 at 3:22 PM, Harald Alvestrand = <hta@google.com
> =C2=A0 =C2=A0 <mailto:hta@google.= com>
> =C2=A0 =C2=A0 > <mailto:hta@google.com <mailto:hta@google.com>>> wrote:
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 It clearly wasn't clear to Bernar= d either :-)
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 I supported what draft-jesup was sugg= esting - negotiating usage of
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 SCTP in SDP, and not mentioning indiv= idual data channels in
> =C2=A0 =C2=A0 the SDP.
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 On Mon, Apr 22, 2013 at 4:14 PM, Magn= us Westerlund
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 <magnus.westerlund@ericsson.com
> =C2=A0 =C2=A0 <mailto:magnus.westerlund@ericsson.com>
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 <mailto:magnus.westerlund@ericsson.com
> =C2=A0 =C2=A0 <mailto:magnus.westerlund@ericsson.com= >>> wrote:
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 Harald and Peter,
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 Can you bring any clari= ty on what you supported?
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 Cheers
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 Magnus
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 On 2013-04-20 03:04, Be= rnard Aboba wrote:
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 > Magnus said:
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 >> I have now upd= ated the minutes trying to clarify the
> =C2=A0 =C2=A0 context
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 and the
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 >> corrections. P= lease check if you think this makes it
> =C2=A0 =C2=A0 clearer.
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 If not I
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 >> am happy to in= troduce additional clarifications, but please
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 be explicit
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 >> about what sho= uld be changed.
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>
> =C2=A0 =C2=A0 http://www.ietf.org/proceedings/86/minut= es/minutes-86-rtcweb
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 > Peter Thatcher com= mented that he thinks the presenter's
> =C2=A0 =C2=A0 proposal
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 > (draft=C2=ADjesup= =C2=ADrtcweb=C2=ADdata=C2=ADprotocol=C2=AD04) =C2=A0is great.
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 > [BA] My impression= was that this remark more related to the
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 presentation
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 > suggestions relati= ng to removing of stream negotiation from
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 SDP, which
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 > isn't covered = in draft-jesup-rtcweb-data-protocol-04.
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 > Harald Alvestrand = stated that he Agree with this. Glad got
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 data channel
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 > negotiation out of= the document.
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 > [BA] =C2=A0Since d= raft-jesup-rtcweb-data-protocol is about
> =C2=A0 =C2=A0 setting
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 up data
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 > channels this does= n't make sense to me. =C2=A0Was Harald perhaps
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 referring to
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 > getting data chann= el negotiation "out of SDP"?
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 --
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 Magnus Westerlund
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 --------------------------------------------------------= --------------
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 Multimedia Technologies= , Ericsson Research EAB/TVM
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 --------------------------------------------------------= --------------
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 Ericsson AB =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| Phone =C2=A0+46 10 7148287
> =C2=A0 =C2=A0 <tel:%2B46%2010%207148287>
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 <tel:%2B46%2010%2071= 48287>
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 F=C3=A4r=C3=B6gatan 6 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| Mobile +46 73 0949= 079
> =C2=A0 =C2=A0 <tel:%2B46%2073%200949079>
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 <tel:%2B46%2073%2009= 49079>
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 SE-164 80 Stockholm, Sw= eden| mailto:
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 magnus.westerlund@ericsson.com
> =C2=A0 =C2=A0 <mailto:magnus.westerlund@ericsson.com>
> =C2=A0 =C2=A0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 <mailto:magnus.westerlund@ericsson.com > =C2=A0 =C2=A0 <mailto:magnus.westerlund@ericsson.com>>
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 --------------------------------------------------------= --------------
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 >
> =C2=A0 =C2=A0 >
>
>
> =C2=A0 =C2=A0 --
>
> =C2=A0 =C2=A0 Magnus Westerlund
>
> =C2=A0 =C2=A0 --------------------------------------------------------= --------------
> =C2=A0 =C2=A0 Multimedia Technologies, Ericsson Research EAB/TVM
> =C2=A0 =C2=A0 --------------------------------------------------------= --------------
> =C2=A0 =C2=A0 Ericsson AB =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0| Phone =C2=A0+46 10 7148287
> =C2=A0 =C2=A0 <tel:%2B46%2010%207148287>
> =C2=A0 =C2=A0 F=C3=A4r=C3=B6gatan 6 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0| Mobile +46 73 0949079
> =C2=A0 =C2=A0 <tel:%2B46%2073%200949079>
> =C2=A0 =C2=A0 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com
> =C2=A0 =C2=A0 <mailto:magnus.westerlund@ericsson.com>
> =C2=A0 =C2=A0 --------------------------------------------------------= --------------
>
>


--

Magnus Westerlund

----------------------------------------------------------------------
Multimedia Technologies, Ericsson Research EAB/TVM
----------------------------------------------------------------------
Ericsson AB =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| Phone = =C2=A0+46 10 71= 48287
F=C3=A4r=C3=B6gatan 6 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0| Mobile +46= 73 0949079
SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com
----------------------------------------------------------------------


--047d7b6d826e38242b04db32e152-- From bernard_aboba@hotmail.com Thu Apr 25 11:10:53 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CF0D921F9619 for ; Thu, 25 Apr 2013 11:10:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -101.817 X-Spam-Level: X-Spam-Status: No, score=-101.817 tagged_above=-999 required=5 tests=[AWL=-0.614, BAYES_00=-2.599, MIME_QP_LONG_LINE=1.396, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bOOuDkmKGT-W for ; Thu, 25 Apr 2013 11:10:53 -0700 (PDT) Received: from blu0-omc3-s35.blu0.hotmail.com (blu0-omc3-s35.blu0.hotmail.com [65.55.116.110]) by ietfa.amsl.com (Postfix) with ESMTP id 3EBBE21F960C for ; Thu, 25 Apr 2013 11:10:53 -0700 (PDT) Received: from BLU403-EAS26 ([65.55.116.74]) by blu0-omc3-s35.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Thu, 25 Apr 2013 11:10:53 -0700 X-EIP: [LIrCd+KT0r85krIGOLmELwgUroh4gAoa] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> From: Bernard Aboba MIME-Version: 1.0 (1.0) In-Reply-To: <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> Date: Thu, 25 Apr 2013 11:10:48 -0700 To: Alan Johnston X-OriginalArrivalTime: 25 Apr 2013 18:10:53.0438 (UTC) FILETIME=[398D89E0:01CE41E0] Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 18:10:53 -0000 I agree with Alan. At this point, at least one implementation supports both S= RTP/SDES as well as DTLS/SRTP and I think this approach is probably the best= way forward. On Apr 25, 2013, at 9:39 AM, "Alan Johnston" wro= te: > I'm not a fan of SDES. However, I've come to believe that we need it for t= wo reasons.=20 >=20 > 1. There is a backwards compatibility reason. There are deployed systems o= f SRTP that use SDES or a key agreement that easily maps to it. Just as we a= llowed G.711 for these systems, it seems reasonable to allow SDES as well. W= hen combined with ICE Lite in a media gateway, this is a scalable interop ap= proach.=20 >=20 > 2. We need it or something like it for API reasons. There are cases where t= he JavaScript needs to tell the browser what SRTP key to use. Since JSEP use= s SDP for this API surface, SDES works for this. Obviously it is a bad idea t= o send this key over unsecured channels, but this is separate from this API i= ssue.=20 >=20 > And just to be clear, browser to browser should use DTLS-SRTP, and only th= us mode should be considered "secure" using whatever user interface a browse= r chooses.=20 >=20 > - Alan - >=20 >=20 >=20 > On Apr 25, 2013, at 11:57 AM, Cullen Jennings wrote: >=20 >>=20 >> The working groups committed some time ago to have a further discussion o= n whether SDP Security Descriptions (RFC 4568 aka SDES) would be usable as a= keying method for WebRTC. As we prepare for that discussion, we'd like to h= ave expressions of interest or support for that approach which indicate the g= eneral outlines of support proposed. If you wish to make such an expression= of support, please send it to the chairs or the list. >>=20 >> Cullen, Magnus, & Ted >>=20 >>=20 >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From Kalyani.Bogineni@VerizonWireless.com Thu Apr 25 13:22:41 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4F84121F96A6 for ; Thu, 25 Apr 2013 13:22:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -100 X-Spam-Level: X-Spam-Status: No, score=-100 tagged_above=-999 required=5 tests=[USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3qAR7HOOnq-9 for ; Thu, 25 Apr 2013 13:22:40 -0700 (PDT) Received: from vanguard.verizonwireless.com (vanguard.verizonwireless.com [162.115.35.70]) by ietfa.amsl.com (Postfix) with ESMTP id 74EF321F96A5 for ; Thu, 25 Apr 2013 13:22:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=verizonwireless.com; i=@verizonwireless.com; q=dns/txt; s=prodmail; t=1366921360; x=1398457360; h=from:to:cc:date:subject:references:in-reply-to: content-transfer-encoding:mime-version; bh=A88/r4uY/5gkmRkaPgD3jyNY0DFMMX9LD6qd4M/H8Rg=; b=E4Uvx6ArcXJrZmJxQTZwgvGIgK9nMbL3JtxsdFq1MhmUds+HWitKJ4tw yRF62PIImL2GMWjc0FoJg+prIWM7NmaDzLF3NzTe3WtiDDe6sRwFWW8DX a4TwIoP+UNSXVzH//+IDIrPmNitt5z78dgLxI7koa9y4yl4LV+6knKdFO 8=; Received: from ohdub02exhub03.uswin.ad.vzwcorp.com ([10.97.42.165]) by vanguard.verizonwireless.com with ESMTP; 25 Apr 2013 13:21:27 -0700 Received: from OHDUB02EXCV33.uswin.ad.vzwcorp.com ([10.97.42.179]) by OHDUB02EXHUB03.uswin.ad.vzwcorp.com ([10.97.42.165]) with mapi; Thu, 25 Apr 2013 16:20:42 -0400 From: "Bogineni, Kalyani" To: 'Cullen Jennings' , "rtcweb@ietf.org" Date: Thu, 25 Apr 2013 16:20:41 -0400 Thread-Topic: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb Thread-Index: Ac5BzZpsa6+wb9PATw2sk+Xw6C5H7QAJIX4Q References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> In-Reply-To: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Message-Id: <20130425202238.74EF321F96A5@ietfa.amsl.com> Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 20:22:41 -0000 We would like to support the use of SDES as a keying method for WebRTC. Kalyani Bogineni Verizon -----Original Message----- From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of= Cullen Jennings Sent: Thursday, April 25, 2013 11:57 AM To: rtcweb@ietf.org Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb The working groups committed some time ago to have a further discussion on = whether SDP Security Descriptions (RFC 4568 aka SDES) would be usable as a = keying method for WebRTC. As we prepare for that discussion, we'd like to = have expressions of interest or support for that approach which indicate th= e general outlines of support proposed. If you wish to make such an expres= sion of support, please send it to the chairs or the list. Cullen, Magnus, & Ted _______________________________________________ rtcweb mailing list rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb From matthew.kaufman@skype.net Thu Apr 25 13:28:05 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4ABD921F93F0 for ; Thu, 25 Apr 2013 13:28:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0 X-Spam-Level: X-Spam-Status: No, score=0 tagged_above=-999 required=5 tests=[none] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YOeIFzMeHzPj for ; Thu, 25 Apr 2013 13:28:04 -0700 (PDT) Received: from na01-by2-obe.outbound.protection.outlook.com (mail-by2lp0243.outbound.protection.outlook.com [207.46.163.243]) by ietfa.amsl.com (Postfix) with ESMTP id E03E721F93B9 for ; Thu, 25 Apr 2013 13:28:03 -0700 (PDT) Received: from BN1BFFO11FD022.protection.gbl (10.58.52.201) by BN1AFFO11HUB032.protection.gbl (10.58.52.142) with Microsoft SMTP Server (TLS) id 15.0.675.0; Thu, 25 Apr 2013 20:28:01 +0000 Received: from TK5EX14HUBC104.redmond.corp.microsoft.com (131.107.125.37) by BN1BFFO11FD022.mail.protection.outlook.com (10.58.53.82) with Microsoft SMTP Server (TLS) id 15.0.675.0 via Frontend Transport; Thu, 25 Apr 2013 20:28:01 +0000 Received: from TK5EX14MBXC272.redmond.corp.microsoft.com ([169.254.2.242]) by TK5EX14HUBC104.redmond.corp.microsoft.com ([157.54.80.25]) with mapi id 14.02.0318.003; Thu, 25 Apr 2013 20:27:52 +0000 From: "Matthew Kaufman (SKYPE)" To: "Bogineni, Kalyani" , "'Cullen Jennings'" , "rtcweb@ietf.org" Thread-Topic: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb Thread-Index: AQHOQc2XfQPA+8NP/kG64CStJCaibJjnYRuAgAABw+A= Date: Thu, 25 Apr 2013 20:27:51 +0000 Message-ID: References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> In-Reply-To: <20130425202238.74EF321F96A5@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [157.54.51.72] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Forefront-Antispam-Report: CIP:131.107.125.37; CTRY:US; IPV:CAL; IPV:NLI; EFV:NLI; SFV:NSPM; SFS:(199002)(189002)(13464002)(51704004)(377454001)(81542001)(74366001)(16406001)(47446002)(77982001)(65816001)(55846006)(46102001)(69226001)(49866001)(31966008)(56816002)(80022001)(6806003)(50466002)(20776003)(63696002)(33656001)(81342001)(74662001)(51856001)(46406003)(54316002)(47776003)(23726002)(4396001)(47976001)(74502001)(54356001)(56776001)(66066001)(76482001)(47736001)(59766001)(79102001)(50986001)(53806001); DIR:OUT; SFP:; SCL:1; SRVR:BN1AFFO11HUB032; H:TK5EX14HUBC104.redmond.corp.microsoft.com; RD:InfoDomainNonexistent; A:1; MX:1; LANG:en; X-OriginatorOrg: microsoft.onmicrosoft.com X-Forefront-PRVS: 0827D7ACB9 Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 20:28:05 -0000 I agree. The ability to set the cipher suite and keys from JavaScript is cr= itical for certain applications. SDES is the best we'll get with SDP as the= API. DTLS-SRTP-only would be unacceptably limiting. Matthew Kaufman > -----Original Message----- > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > Behalf Of Bogineni, Kalyani > Sent: Thursday, April 25, 2013 1:21 PM > To: 'Cullen Jennings'; rtcweb@ietf.org > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb >=20 > We would like to support the use of SDES as a keying method for WebRTC. >=20 > Kalyani Bogineni > Verizon >=20 > -----Original Message----- > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > Behalf Of Cullen Jennings > Sent: Thursday, April 25, 2013 11:57 AM > To: rtcweb@ietf.org > Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb >=20 >=20 > The working groups committed some time ago to have a further discussion > on whether SDP Security Descriptions (RFC 4568 aka SDES) would be usable > as a keying method for WebRTC. As we prepare for that discussion, we'd l= ike > to have expressions of interest or support for that approach which indica= te > the general outlines of support proposed. If you wish to make such an > expression of support, please send it to the chairs or the list. >=20 > Cullen, Magnus, & Ted >=20 >=20 > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From fluffy@cisco.com Thu Apr 25 14:10:06 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0B3FD21F96CC for ; Thu, 25 Apr 2013 14:10:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -108 X-Spam-Level: X-Spam-Status: No, score=-108 tagged_above=-999 required=5 tests=[RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cKZYhsFHrwCQ for ; Thu, 25 Apr 2013 14:10:05 -0700 (PDT) Received: from rcdn-iport-4.cisco.com (rcdn-iport-4.cisco.com [173.37.86.75]) by ietfa.amsl.com (Postfix) with ESMTP id 7E12F21F96CA for ; Thu, 25 Apr 2013 14:10:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=563; q=dns/txt; s=iport; t=1366924205; x=1368133805; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-id:content-transfer-encoding: mime-version; bh=8lSjkPcmDkbhxj2e5QuVDTWjEU5y0V4xBgS7ePYbkWQ=; b=We4aYREsuYK1GjRWdgz0vpvC/Bmotz3pGrl+OBg9gCtNcZp+u6q3HWMI 0esWI9pOMXcfD3RHBys/EV3QTaJOFDl0gVwfyyFCNHy5tWQegYI4yctU2 RbdfM7a/bcllPMwqQBuSn1XxzayBPo1zMpgZeaGTC7Jz5xzEZU9PpmgG4 4=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AosGAFCaeVGtJXG//2dsb2JhbABRgwaDJrtBgQQWbQeCHwEBAQMBeQULAgEIIiQyJQIEDgUIE4dzBr5TjwICMQeCbWEDoSGHHYMOgig X-IronPort-AV: E=Sophos;i="4.87,553,1363132800"; d="scan'208";a="203263818" Received: from rcdn-core2-4.cisco.com ([173.37.113.191]) by rcdn-iport-4.cisco.com with ESMTP; 25 Apr 2013 21:10:05 +0000 Received: from xhc-aln-x02.cisco.com (xhc-aln-x02.cisco.com [173.36.12.76]) by rcdn-core2-4.cisco.com (8.14.5/8.14.5) with ESMTP id r3PLA5XT022308 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 25 Apr 2013 21:10:05 GMT Received: from xmb-aln-x02.cisco.com ([169.254.5.192]) by xhc-aln-x02.cisco.com ([173.36.12.76]) with mapi id 14.02.0318.004; Thu, 25 Apr 2013 16:10:04 -0500 From: "Cullen Jennings (fluffy)" To: "rtcweb@ietf.org" Thread-Topic: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN Thread-Index: AQHOQflBi1erDoB5e0Kx1cZ1sYRwVA== Date: Thu, 25 Apr 2013 21:10:04 +0000 Message-ID: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <5174C8D2.40504@matthew.at> <5177F7EE.1010909@matthew.at> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.20.249.164] Content-Type: text/plain; charset="Windows-1252" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 21:10:06 -0000 So with my co-chair hat on here=85=20 It seems we have been around the need for OPEN several times and have come = to consensus on it in the past. Can someone please: 1) summarize the arguments that in the past that lead us to think we need O= PEN=20 2) sketch out the range of possible solutions to deal with unexpected data = before the OPEN=20 Cullen=20 On Apr 24, 2013, at 11:28 PM, Matthew Kaufman (SKYPE) wrote: > I=92d still love to hear why it is =93needed=94 though. > =20 > Matthew Kaufman From randell-ietf@jesup.org Thu Apr 25 14:42:53 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4BDEB21F9715 for ; Thu, 25 Apr 2013 14:42:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0 X-Spam-Level: X-Spam-Status: No, score=0 tagged_above=-999 required=5 tests=[none] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fyVU1M8EoD-R for ; Thu, 25 Apr 2013 14:42:52 -0700 (PDT) Received: from r2-chicago.webserversystems.com (r2-chicago.webserversystems.com [173.236.101.58]) by ietfa.amsl.com (Postfix) with ESMTP id 8EC0B21F970F for ; Thu, 25 Apr 2013 14:42:52 -0700 (PDT) Received: from pool-98-111-140-34.phlapa.fios.verizon.net ([98.111.140.34]:2991 helo=[192.168.1.12]) by r2-chicago.webserversystems.com with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.80) (envelope-from ) id 1UVTwJ-0001Yp-Nu for rtcweb@ietf.org; Thu, 25 Apr 2013 16:42:51 -0500 Message-ID: <5179A362.2000309@jesup.org> Date: Thu, 25 Apr 2013 17:42:58 -0400 From: Randell Jesup User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <5174C8D2.40504@matthew.at> <5177F7EE.1010909@matthew.at> In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - r2-chicago.webserversystems.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - jesup.org Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 21:42:53 -0000 On 4/25/2013 5:10 PM, Cullen Jennings (fluffy) wrote: > So with my co-chair hat on here… > > It seems we have been around the need for OPEN several times and have come to consensus on it in the past. Can someone please: > > 1) summarize the arguments that in the past that lead us to think we need OPEN The Open message has some important and useful properties: 1) It's easier to work with. JS isn't an ideal language for writing network protocols, especially for non-network-programmers (i.e. a large portion of the expected developer community). Open makes it really easy for a developer to get the type of bidirectional stream them want with little fuss, and in a manner that maps easily to APIs they're already used to (e.g. WebSockets). In many cases the label field will avoid the JS programmer having to build their own mini-protocol to identify their channels (and this is especially painful for them if it's an unreliable channel). 2) It makes it possible to have different applications exchange data, by having an IANA-registered protocol name, like WebSockets (and there was strong agreement on it's being needed for that at Atlanta.) With external-negotiation-only, it would be very hard for different apps to interoperate, since they'd need to agree on negotiation protocols as well, which are likely to be highly divergent between apps. 3) The Open message, being in-channel, reliable and in-order, makes the issue that was the genesis of this thread (what to do with data that arrives unexpectedly) simpler. With Open, only degenerate cases can cause more than a relatively small amount of data to be buffered. With external notification, the external negotiation channel can fail (or be very slow), or the app can have a bug and fail to install the negotiated values, leading to larger or unbounded buffering requirements - or you punt the problem to the application by delivering the data, but the application is facing the same conundrum of buffer it or throw it away. > 2) sketch out the range of possible solutions to deal with unexpected data before the OPEN The issue exists regardless of whether Open is used or external negotiation (and in fact is much simpler for Open). *tl;dr: *I'm ok with any setting of maximum sizes and/or times that would not adversely impact temporary buffering for normal cases with Open of unordered channels. This is option C below. I also would be ok with B, but I realize others may not be. Regardless of supporting Open or not, any external negotiation of dynamic channels must use one of these: A) a 2-or-3-way handshake so the sender knows the receiver is ready to receive the data on the specified channel before sending it, or B) unbounded buffering of data if the external negotiation messages are delayed (again, what we're discussing in this thread), or C) bounded buffering of data (bounded by time, size or both), with data being dropped and the channel closed if the limits are exceeded, or D) deliver unexpected data to the application, which will do .... I don't know what with it. For (D), the application will likely drop it on the floor (leading to hard-to-test-for problems if the channel is later configured by Open or external negotiation), or buffer it waiting for the channel to open. Supporting Open or not has little bearing on these scenarios -- and in fact, since Open is in-channel, reliable, and ordered, it reduces the problem set (when Open is used) to only unordered channels (in ordered channels Open will always be first). Buffering unexpected data on channels (options B or C) is useful. It means that in the external negotiation case, one side asking for a new channel to open by some private means doesn't need to wait to start sending data on that channel. Note that with external negotiation (possibly on a non p2p path, like via signaling), the receiver might not know what to install for a short while, especially if there's a routing issue or server issue (not a problem that happens with Open). Since normal Open cases have very little chance of triggering this problem (triggering buffering), some arbitrary size limit seems reasonable (option C). Often in network protocols there are small buffers (4, 16, 64KB). I prefer a larger value of say 256KB so that apps using external negotiation can just send largish data immediately - and note: actually buffering data is still an unlikely occurrence even in most external negotiation cases. If people want to bikeshed on the buffersize or timeout, that's fine. ;-) Also, external negotiation is the only case where more than a trivial amount of data can "pile up" in the buffer waiting for the receiving side to finish it's side of the negotiation (i.e. if your external negotiation channel fails or the app has a brain fart). -- Randell Jesup randell-ietf@jesup.org From richard.ejzak@alcatel-lucent.com Thu Apr 25 14:55:28 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C0F7221F92C0 for ; Thu, 25 Apr 2013 14:55:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -8 X-Spam-Level: X-Spam-Status: No, score=-8 tagged_above=-999 required=5 tests=[RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TvEXK11mLlmC for ; Thu, 25 Apr 2013 14:55:27 -0700 (PDT) Received: from ihemail3.lucent.com (ihemail3.lucent.com [135.245.0.37]) by ietfa.amsl.com (Postfix) with ESMTP id 48BEE21F9690 for ; Thu, 25 Apr 2013 14:55:27 -0700 (PDT) Received: from us70tusmtp2.zam.alcatel-lucent.com (h135-5-2-64.lucent.com [135.5.2.64]) by ihemail3.lucent.com (8.13.8/IER-o) with ESMTP id r3PLtK2T006594 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL) for ; Thu, 25 Apr 2013 16:55:21 -0500 (CDT) Received: from US70TWXCHHUB03.zam.alcatel-lucent.com (us70twxchhub03.zam.alcatel-lucent.com [135.5.2.35]) by us70tusmtp2.zam.alcatel-lucent.com (GMO) with ESMTP id r3PLtKPU028685 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Thu, 25 Apr 2013 17:55:20 -0400 Received: from US70UWXCHMBA04.zam.alcatel-lucent.com ([169.254.12.73]) by US70TWXCHHUB03.zam.alcatel-lucent.com ([135.5.2.35]) with mapi id 14.02.0247.003; Thu, 25 Apr 2013 17:55:20 -0400 From: "Ejzak, Richard P (Richard)" To: "rtcweb@ietf.org" Thread-Topic: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb Thread-Index: AQHOQc2b/Cgh8/1Iw0eB7cqfjULVv5jnpCmAgAACAYD//8nZ4A== Date: Thu, 25 Apr 2013 21:55:20 +0000 Message-ID: <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [135.5.27.16] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.57 on 135.245.2.37 Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 21:55:28 -0000 I also agree that we should support SDES in addition to DTLS-SRTP. This raises a further question about SCTP/DTLS for DataChannels. It seems = that if we support SDES-SRTP, don't we also need to provide an SDES keying = mechanism for DataChannels? Ekr: What is needed to realize this? Richard Ejzak > -----Original Message----- > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > Behalf Of Matthew Kaufman (SKYPE) > Sent: Thursday, April 25, 2013 3:28 PM > To: Bogineni, Kalyani; 'Cullen Jennings'; rtcweb@ietf.org > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb >=20 > I agree. The ability to set the cipher suite and keys from JavaScript > is critical for certain applications. SDES is the best we'll get with > SDP as the API. DTLS-SRTP-only would be unacceptably limiting. >=20 > Matthew Kaufman >=20 > > -----Original Message----- > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > Behalf Of Bogineni, Kalyani > > Sent: Thursday, April 25, 2013 1:21 PM > > To: 'Cullen Jennings'; rtcweb@ietf.org > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > We would like to support the use of SDES as a keying method for > WebRTC. > > > > Kalyani Bogineni > > Verizon > > > > -----Original Message----- > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > Behalf Of Cullen Jennings > > Sent: Thursday, April 25, 2013 11:57 AM > > To: rtcweb@ietf.org > > Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > > > The working groups committed some time ago to have a further > > discussion on whether SDP Security Descriptions (RFC 4568 aka SDES) > > would be usable as a keying method for WebRTC. As we prepare for > that > > discussion, we'd like to have expressions of interest or support for > > that approach which indicate the general outlines of support > proposed. > > If you wish to make such an expression of support, please send it to > the chairs or the list. > > > > Cullen, Magnus, & Ted > > > > > > _______________________________________________ > > rtcweb mailing list > > rtcweb@ietf.org > > https://www.ietf.org/mailman/listinfo/rtcweb > > _______________________________________________ > > rtcweb mailing list > > rtcweb@ietf.org > > https://www.ietf.org/mailman/listinfo/rtcweb >=20 > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From igor.faynberg@alcatel-lucent.com Thu Apr 25 15:06:14 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 46E2721F971B for ; Thu, 25 Apr 2013 15:06:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -7.4 X-Spam-Level: X-Spam-Status: No, score=-7.4 tagged_above=-999 required=5 tests=[J_CHICKENPOX_33=0.6, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id m2pd5lOqh6Ll for ; Thu, 25 Apr 2013 15:06:13 -0700 (PDT) Received: from ihemail1.lucent.com (ihemail1.lucent.com [135.245.0.33]) by ietfa.amsl.com (Postfix) with ESMTP id 84AB021F9717 for ; Thu, 25 Apr 2013 15:06:13 -0700 (PDT) Received: from usnavsmail2.ndc.alcatel-lucent.com (usnavsmail2.ndc.alcatel-lucent.com [135.3.39.10]) by ihemail1.lucent.com (8.13.8/IER-o) with ESMTP id r3PM6CW7027483 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL) for ; Thu, 25 Apr 2013 17:06:13 -0500 (CDT) Received: from umail.lucent.com (umail.ndc.lucent.com [135.3.40.61]) by usnavsmail2.ndc.alcatel-lucent.com (8.14.3/8.14.3/GMO) with ESMTP id r3PM6Bhw007431 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Thu, 25 Apr 2013 17:06:12 -0500 Received: from [135.244.42.169] ([135.244.42.169]) by umail.lucent.com (8.13.8/TPES) with ESMTP id r3PM6BQX015821; Thu, 25 Apr 2013 17:06:11 -0500 (CDT) Message-ID: <5179A8D3.4080706@alcatel-lucent.com> Date: Thu, 25 Apr 2013 18:06:11 -0400 From: Igor Faynberg Organization: Alcatel-Lucent User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.18) Gecko/20110616 Thunderbird/3.1.11 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.57 on 135.245.2.33 X-Scanned-By: MIMEDefang 2.64 on 135.3.39.10 Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: igor.faynberg@alcatel-lucent.com List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 22:06:14 -0000 +1 (From someone who had proposed this, as an option, 100,000 messages before) Igor >> -----Original Message----- >> From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On >> Behalf Of Bogineni, Kalyani >> Sent: Thursday, April 25, 2013 1:21 PM >> To: 'Cullen Jennings'; rtcweb@ietf.org >> Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb >> >> We would like to support the use of SDES as a keying method for WebRTC. >> >> Kalyani Bogineni >> Verizon >> >> -----Original Message----- >> From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On >> Behalf Of Cullen Jennings >> Sent: Thursday, April 25, 2013 11:57 AM >> To: rtcweb@ietf.org >> Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb >> >> >> The working groups committed some time ago to have a further discussion >> on whether SDP Security Descriptions (RFC 4568 aka SDES) would be usable >> as a keying method for WebRTC. As we prepare for that discussion, we'd like >> to have expressions of interest or support for that approach which indicate >> the general outlines of support proposed. If you wish to make such an >> expression of support, please send it to the chairs or the list. >> >> Cullen, Magnus,& Ted >> >> >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From martin.thomson@gmail.com Thu Apr 25 15:11:24 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6EA3B21F9727 for ; Thu, 25 Apr 2013 15:11:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.001 X-Spam-Level: X-Spam-Status: No, score=-0.001 tagged_above=-999 required=5 tests=[NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LgZJFSes+EeJ for ; Thu, 25 Apr 2013 15:11:24 -0700 (PDT) Received: from mail-we0-x231.google.com (mail-we0-x231.google.com [IPv6:2a00:1450:400c:c03::231]) by ietfa.amsl.com (Postfix) with ESMTP id 0B1F421F970D for ; Thu, 25 Apr 2013 15:11:18 -0700 (PDT) Received: by mail-we0-f177.google.com with SMTP id s47so2243024wey.8 for ; Thu, 25 Apr 2013 15:11:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=a1p1TefRSXf2ffj7VIKBB0td95Y3pKfUkP/bIz/FxjE=; b=c5PPxGlzXax1dJxA2MP3kQN37k4vXM6ugApJnj44++SKgnSHHy3SMDcJ2/UoHvtHhu 0i0qMDimJKoqgN7/4cS5sL6xNmiw1i1I2CICtYS+Yv3DVrFyyM7vscXSbPJ6/86gko4A 0ZGv1qjvUSfb+Y3tscgeqs29tU7FvRc5YJkMUDC04SedpaMB+4nqzBlnLfi4AslTMnob GwqlMR4fzwsaSwPDbrqTDPOcbrgm9m+08YLEt7Q5V74zRDBOA0pS8/Ar7Luis4OfI7NG +NinxwBvQbtA2ladbItnLjjncTlF3fZDis32xN1qZqKnHBK6ULU77iPIzhVrc8nP5sT/ wzwQ== MIME-Version: 1.0 X-Received: by 10.180.198.49 with SMTP id iz17mr418160wic.19.1366927871311; Thu, 25 Apr 2013 15:11:11 -0700 (PDT) Received: by 10.194.33.102 with HTTP; Thu, 25 Apr 2013 15:11:11 -0700 (PDT) In-Reply-To: <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> Date: Thu, 25 Apr 2013 15:11:11 -0700 Message-ID: From: Martin Thomson To: "Ejzak, Richard P (Richard)" Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 22:11:24 -0000 On 25 April 2013 14:55, Ejzak, Richard P (Richard) wrote: > I also agree that we should support SDES in addition to DTLS-SRTP. > > This raises a further question about SCTP/DTLS for DataChannels. It seems that if we support SDES-SRTP, don't we also need to provide an SDES keying mechanism for DataChannels? Ekr: What is needed to realize this? Data channels use the DTLS record layer, so using SDES for those would be harder than I think you want. Data channels can continue to use DTLS even though media is encrypted using keys provided by security descriptions. From dwing@cisco.com Thu Apr 25 15:14:57 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8A71C21F9714 for ; Thu, 25 Apr 2013 15:14:57 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -108 X-Spam-Level: X-Spam-Status: No, score=-108 tagged_above=-999 required=5 tests=[RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uUdNldMDvo2F for ; Thu, 25 Apr 2013 15:14:56 -0700 (PDT) Received: from mtv-iport-3.cisco.com (mtv-iport-3.cisco.com [173.36.130.14]) by ietfa.amsl.com (Postfix) with ESMTP id 421B821F9710 for ; Thu, 25 Apr 2013 15:14:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2829; q=dns/txt; s=iport; t=1366928096; x=1368137696; h=mime-version:subject:from:in-reply-to:date:cc: content-transfer-encoding:message-id:references:to; bh=1ftg+Dxr/BEtq7iEzxgE9NIgIQEONrz/L9dKAOZOB1w=; b=aAzz4aAT8diBf7MjDlmA1Z4o9L5gmFm7PykvZxqAvB0z5Y/wMPXJWZzU b2Vz2IJpg8MZc1/kdMCC4UHYR4eOZB6pPZgYflzhTktvdBgO9oNMiqtgJ RAg6p3ttrxMJOhxT1KBm7qrNGpnZHQlad9ZV7wrjbeVsNYvJMMwkCIfs7 M=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgMFANOpeVGrRDoI/2dsb2JhbABRgwY2Ab4wgQQWdIIfAQEBAgEBAQEBNzQLBQsLGC4hBjAGEwmHeQMJBQ21cg2IS4xfgiMzB4JtYQOJEYwngWSGD4V0hR+DLhw X-IronPort-AV: E=Sophos;i="4.87,553,1363132800"; d="scan'208";a="77058054" Received: from mtv-core-3.cisco.com ([171.68.58.8]) by mtv-iport-3.cisco.com with ESMTP; 25 Apr 2013 22:14:56 +0000 Received: from [10.156.16.30] ([10.156.16.30]) by mtv-core-3.cisco.com (8.14.5/8.14.5) with ESMTP id r3PMEtND011677; Thu, 25 Apr 2013 22:14:55 GMT Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) From: Dan Wing In-Reply-To: <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> Date: Thu, 25 Apr 2013 15:14:55 -0700 Content-Transfer-Encoding: quoted-printable Message-Id: <91B4F744-2201-4361-A8D8-7D36F47B865C@cisco.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> To: Alan Johnston X-Mailer: Apple Mail (2.1503) Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 22:14:57 -0000 On Apr 25, 2013, at 9:39 AM, Alan Johnston = wrote: > I'm not a fan of SDES. However, I've come to believe that we need it = for two reasons.=20 >=20 > 1. There is a backwards compatibility reason. There are deployed = systems of SRTP that use SDES or a key agreement that easily maps to it. = Just as we allowed G.711 for these systems, it seems reasonable to allow = SDES as well. When combined with ICE Lite in a media gateway, this is a = scalable interop approach.=20 Interworking at scale can be accomplished without SDES on WEBRTC, as I = explained at IETF83 in slides 27-35 of = http://www.ietf.org/proceedings/83/slides/slides-83-rtcweb-3.pdf. > 2. We need it or something like it for API reasons. There are cases = where the JavaScript needs to tell the browser what SRTP key to use. DTLS-SRTP with EKT can also perform that function, and does it without = disclosing the SRTP key to all the SIP proxies and all the web servers = on the signaling path. > Since JSEP uses SDP for this API surface, SDES works for this. = Obviously it is a bad idea to send this key over unsecured channels, but = this is separate from this API issue.=20 >=20 > And just to be clear, browser to browser should use DTLS-SRTP, and = only thus mode should be considered "secure" using whatever user = interface a browser chooses.=20 But is there a secure mechanism to differentiate browser-to-browser = calls from browser-to-non-browser calls, so we don't have to worry over = SDES downgrade attacks? And for the use-cases where JavaScript has to = set the key, those will often be browser-to-browser calls, meaning that = we will have to support browser-to-browser SDES, contrary to your desire = that browser-to-browser use DTLS-SRTP? DTLS-SRTP with EKT permits the = application to set the SRTP key, and more securely than SDES. -d >=20 > - Alan - >=20 >=20 >=20 > On Apr 25, 2013, at 11:57 AM, Cullen Jennings wrote: >=20 >>=20 >> The working groups committed some time ago to have a further = discussion on whether SDP Security Descriptions (RFC 4568 aka SDES) = would be usable as a keying method for WebRTC. As we prepare for that = discussion, we'd like to have expressions of interest or support for = that approach which indicate the general outlines of support proposed. = If you wish to make such an expression of support, please send it to the = chairs or the list. >>=20 >> Cullen, Magnus, & Ted >>=20 >>=20 >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From Mandeep.Singh@mavenir.com Thu Apr 25 15:19:13 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0C70D21F96C4 for ; Thu, 25 Apr 2013 15:19:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0 X-Spam-Level: X-Spam-Status: No, score=0 tagged_above=-999 required=5 tests=[none] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HeIo0eXRzQgr for ; Thu, 25 Apr 2013 15:19:12 -0700 (PDT) Received: from HUB024-nj-6.exch024.serverdata.net (hub024-nj-6.exch024.serverdata.net [206.225.165.112]) by ietfa.amsl.com (Postfix) with ESMTP id 73A4621F96BC for ; Thu, 25 Apr 2013 15:19:12 -0700 (PDT) Received: from MBX024-E1-NJ-2.exch024.domain.local ([10.240.10.52]) by HUB024-NJ-6.exch024.domain.local ([10.240.10.45]) with mapi id 14.02.0318.001; Thu, 25 Apr 2013 15:19:11 -0700 From: Mandeep Singh To: "rtcweb@ietf.org" Thread-Topic: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb Thread-Index: AQHOQc2ZUXUTsDVm60WY+suOGgC17pjnmKcAgAAZgwD//83vsA== Date: Thu, 25 Apr 2013 22:19:11 +0000 Message-ID: <26ADD8827FF29046B2E32AE632033BC41804B1EB@mbx024-e1-nj-2.exch024.domain.local> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [38.122.186.90] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 22:19:13 -0000 I believe SDES (besides DTLS-SRTP) is good idea for backward compatibility = and interoperability reason. However for browser to browser communication, DTLS-SRTP should be preferred= . Mandeep Singh -----Original Message----- >=20 > On Apr 25, 2013, at 11:57 AM, Cullen Jennings wrote: >=20 >>=20 >> The working groups committed some time ago to have a further discussion = on whether SDP Security Descriptions (RFC 4568 aka SDES) would be usable as= a keying method for WebRTC. As we prepare for that discussion, we'd like = to have expressions of interest or support for that approach which indicate= the general outlines of support proposed. If you wish to make such an exp= ression of support, please send it to the chairs or the list. >>=20 >> Cullen, Magnus, & Ted >>=20 >>=20 >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb _______________________________________________ rtcweb mailing list rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb From adam@nostrum.com Thu Apr 25 15:20:25 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2CF8521F96DF for ; Thu, 25 Apr 2013 15:20:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -100.001 X-Spam-Level: X-Spam-Status: No, score=-100.001 tagged_above=-999 required=5 tests=[SPF_PASS=-0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ip1ML-omilNb for ; Thu, 25 Apr 2013 15:20:24 -0700 (PDT) Received: from shaman.nostrum.com (nostrum-pt.tunnel.tserv2.fmt.ipv6.he.net [IPv6:2001:470:1f03:267::2]) by ietfa.amsl.com (Postfix) with ESMTP id A56BD21F96BC for ; Thu, 25 Apr 2013 15:20:24 -0700 (PDT) Received: from Orochi.local (99-152-145-110.lightspeed.dllstx.sbcglobal.net [99.152.145.110]) (authenticated bits=0) by shaman.nostrum.com (8.14.3/8.14.3) with ESMTP id r3PMKHAK024837 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO); Thu, 25 Apr 2013 17:20:18 -0500 (CDT) (envelope-from adam@nostrum.com) Message-ID: <5179AC21.5060708@nostrum.com> Date: Thu, 25 Apr 2013 17:20:17 -0500 From: Adam Roach User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: Martin Thomson References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass (shaman.nostrum.com: 99.152.145.110 is authenticated by a trusted mechanism) Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 22:20:25 -0000 On 4/25/13 17:11, Martin Thomson wrote: > Data channels can continue to use DTLS even though media is encrypted > using keys provided by security descriptions. The arguments for SDES fall into two categories, AFAICT: (1) Those required for interop with legacy devices, and (2) those which we are prohibited by RFC 2804 from considering. And there is no possible way DataChannels are going to interop with legacy devices. I agree with Alan that we shouldn't make accommodations to use SDES for the brower-to-browser case. By implication, this means that the presence of DataChannels necessarily means that we're using DTLS-SRTP for the whole session. Given those assumptions, the mixed-session scenario you describe does not arise. /a From worley@shell01.TheWorld.com Thu Apr 25 15:21:06 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3E3B821F96DD for ; Thu, 25 Apr 2013 15:21:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.117 X-Spam-Level: X-Spam-Status: No, score=0.117 tagged_above=-999 required=5 tests=[RCVD_IN_DNSWL_LOW=-1, RCVD_IN_SORBS_WEB=1.117] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tDGGgQfSRfST for ; Thu, 25 Apr 2013 15:21:05 -0700 (PDT) Received: from TheWorld.com (pcls4.std.com [192.74.137.144]) by ietfa.amsl.com (Postfix) with ESMTP id 52C1E21F96C4 for ; Thu, 25 Apr 2013 15:21:05 -0700 (PDT) Received: from shell.TheWorld.com (svani@shell01.theworld.com [192.74.137.71]) by TheWorld.com (8.14.5/8.14.5) with ESMTP id r3PMKVaX014304; Thu, 25 Apr 2013 18:20:34 -0400 Received: from shell01.TheWorld.com (localhost.theworld.com [127.0.0.1]) by shell.TheWorld.com (8.13.6/8.12.8) with ESMTP id r3PMKVvC3449291; Thu, 25 Apr 2013 18:20:31 -0400 (EDT) Received: (from worley@localhost) by shell01.TheWorld.com (8.13.6/8.13.6/Submit) id r3PMKUjt3433388; Thu, 25 Apr 2013 18:20:30 -0400 (EDT) Date: Thu, 25 Apr 2013 18:20:30 -0400 (EDT) Message-Id: <201304252220.r3PMKUjt3433388@shell01.TheWorld.com> From: worley@ariadne.com (Dale R. Worley) Sender: worley@ariadne.com (Dale R. Worley) To: Bernard Aboba In-reply-to: (bernard_aboba@hotmail.com) References: <066.4c5db43349d3176acaa90d17617a02d6@trac.tools.ietf.org> <5173ECC7.7020909@jitsi.org> <51754363.3090300@ericsson.com> <201304222215.r3MMFqsE3199256@shell01.TheWorld.com> <201304231858.r3NIw4OJ3260483@shell01.TheWorld.com> Cc: rtcweb@ietf.org Subject: Re: [rtcweb] #15: Section 4.8: SSRC signaling X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 22:21:06 -0000 > From: Bernard Aboba > > If you have several devices per host (e.g. Multiple cameras) each > using simulcast or layered coding, are supporting screen > sharing/data channel/audio+video and also have a single m= line for > each RTP stream, then this isn't so outlandish. I was working on an essay based on the assumption that a single video capture is carried over a single m= line (with the various component streams (simulcast, FEC, layered encoding, etc.) sent using different SSRCs)... But that isn't how existing systems work, and it may not be workable at all. It would be nice to correct that, but that probably isn't the quick way to get products to market. ;-) If multiplexing based on payload type is unworkable, how about the following technique. (Forgive me if someone else has already proposed it.) Each SSRC is demultiplexed based on an RTCP SDES item that gives the mapping between the SSRC and the m= line via which it is presented to the application layer (that is, the constituent m= line sequence number). When a media stream with new SSRC is sent, the sender inserts an RTCP SDES item with a special multiplexing "item type". The SDES item contains the SSRC value and the sequence number of the m= line via which that SSRC is obtained from the application layer. The sender resends this SDES item occasionally. The receiver keeps a table which maps the SSRCs to the m= lines via which each SSRC is to be presented to the application. Entries in the table are added/updated when the multiplexing SDES items are received. Since SDES items are meant to describe the "source" of the media stream, using an SDES item to identify how the media is supplied by the application is close to its intention. (If one doesn't like that, we could define another RTCP packet type.) This mechanism only adds one 8 byte SDES item periodically in the RTCP (given that RTCP packets often contain SDES packets, so the SDES packet header isn't charged to multiplexing). The overhead is reduced to 4 bytes if the RTCP periodically contains SDES items for the SSRC anyway. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ header |V=2|P| SC | PT=SDES=202 | length | +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ chunk | SSRC | 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | MUX=11 | length=1 |0|m= line seq. | NULL=0 | +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ chunk | ... | 2 With dexterous use of pseudo-UTF-8 encoding to encode sequence numbers, an 8 byte item suffices for the typical case, but we still support multiplexing an unlimited number of m= lines, and even support multiplexing m= lines that specify multiple addresses or ports. This method allows multiplexing to support whatever use of m= lines the overlying application supports/requires, since it places no restrictions on the SDP or RTP usage. In addition, demultiplexing is stable even while the bundling is changing due to a new offer/answer exchange, because the SSRC on the incoming RTP packets will be stable, even while the media stream is redirected from one transport endpoint (for the old bundle) to another transport endpoint (for the new bundle). Dale From martin.thomson@gmail.com Thu Apr 25 15:22:36 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0359221F972B for ; Thu, 25 Apr 2013 15:22:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.001 X-Spam-Level: X-Spam-Status: No, score=-0.001 tagged_above=-999 required=5 tests=[NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ctdzWQ09wHf3 for ; Thu, 25 Apr 2013 15:22:35 -0700 (PDT) Received: from mail-we0-x231.google.com (mail-we0-x231.google.com [IPv6:2a00:1450:400c:c03::231]) by ietfa.amsl.com (Postfix) with ESMTP id 4A63521F9720 for ; Thu, 25 Apr 2013 15:22:35 -0700 (PDT) Received: by mail-we0-f177.google.com with SMTP id s47so2316606wey.22 for ; Thu, 25 Apr 2013 15:22:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=J2gL4D1JnR/UfdV1S4Yrs5vkOpfEz+k1eOilJiTZKis=; b=hwHazfVW54MkoPSqKbNmZtkd+3gN4jM1PS49cTvJQj5+f9JnZHXvj8eYp/y6KctwgW nexT1LFcJnUoKBLIlrXIDyz35v1Le4B/Tqu/fWvj16S/9tFQYphvKq9ZMyOrZoHwKfOE NnI/dR/+XQ3FbaMQgWesxDWyr2QUTdxaplOvQnSQ4Wn8pByGJZqrAnLztrrMJnI+8hl3 3IpGKeRp4smoky/F21Yho2+txnRuKgMswUuw8kXGVVJ9OQpWxj04WT8HXgpqk7uY3EvV 3IJ/LotrACiK/qqgzWIQTAKXW3OrpR17xuGqSwkrW8t+ToinWu73nP4Ki5ulfGmnxoQZ UjXQ== MIME-Version: 1.0 X-Received: by 10.180.74.146 with SMTP id t18mr420116wiv.26.1366928554487; Thu, 25 Apr 2013 15:22:34 -0700 (PDT) Received: by 10.194.33.102 with HTTP; Thu, 25 Apr 2013 15:22:34 -0700 (PDT) In-Reply-To: <5179AC21.5060708@nostrum.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> <5179AC21.5060708@nostrum.com> Date: Thu, 25 Apr 2013 15:22:34 -0700 Message-ID: From: Martin Thomson To: Adam Roach Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 22:22:36 -0000 On 25 April 2013 15:20, Adam Roach wrote: > On 4/25/13 17:11, Martin Thomson wrote: >> >> Data channels can continue to use DTLS even though media is encrypted >> using keys provided by security descriptions. > > The arguments for SDES fall into two categories, AFAICT: (1) Those required > for interop with legacy devices, and (2) those which we are prohibited by > RFC 2804 from considering. And there is no possible way DataChannels are > going to interop with legacy devices. That isn't an exhaustive list. I intend to write down a couple of other items to add to that list. > I agree with Alan that we shouldn't make accommodations to use SDES for the > brower-to-browser case. By implication, this means that the presence of > DataChannels necessarily means that we're using DTLS-SRTP for the whole > session. Given those assumptions, the mixed-session scenario you describe > does not arise. Regardless of the outcome of above, that's a constraint I'd be willing to tolerate. From richard.ejzak@alcatel-lucent.com Thu Apr 25 15:40:06 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D6DB221F96E8 for ; Thu, 25 Apr 2013 15:40:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -8 X-Spam-Level: X-Spam-Status: No, score=-8 tagged_above=-999 required=5 tests=[RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Tthz33c89Z98 for ; Thu, 25 Apr 2013 15:40:05 -0700 (PDT) Received: from ihemail1.lucent.com (ihemail1.lucent.com [135.245.0.33]) by ietfa.amsl.com (Postfix) with ESMTP id 1D4DD21F96CD for ; Thu, 25 Apr 2013 15:39:59 -0700 (PDT) Received: from us70uusmtp4.zam.alcatel-lucent.com (h135-5-2-66.lucent.com [135.5.2.66]) by ihemail1.lucent.com (8.13.8/IER-o) with ESMTP id r3PMdvfd007866 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Thu, 25 Apr 2013 17:39:57 -0500 (CDT) Received: from US70UWXCHHUB02.zam.alcatel-lucent.com (us70uwxchhub02.zam.alcatel-lucent.com [135.5.2.49]) by us70uusmtp4.zam.alcatel-lucent.com (GMO) with ESMTP id r3PMds35013830 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 25 Apr 2013 18:39:56 -0400 Received: from US70UWXCHMBA04.zam.alcatel-lucent.com ([169.254.12.73]) by US70UWXCHHUB02.zam.alcatel-lucent.com ([135.5.2.49]) with mapi id 14.02.0247.003; Thu, 25 Apr 2013 18:39:54 -0400 From: "Ejzak, Richard P (Richard)" To: Adam Roach , Martin Thomson Thread-Topic: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb Thread-Index: AQHOQc2b/Cgh8/1Iw0eB7cqfjULVv5jnpCmAgAACAYD//8nZ4IAAUwaAgAACioD//73+4A== Date: Thu, 25 Apr 2013 22:39:53 +0000 Message-ID: <03FBA798AC24E3498B74F47FD082A92F3BB8FB35@US70UWXCHMBA04.zam.alcatel-lucent.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> <5179AC21.5060708@nostrum.com> In-Reply-To: <5179AC21.5060708@nostrum.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [135.5.27.16] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.57 on 135.245.2.33 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 22:40:07 -0000 Legacy devices support more than just audio and video media. We will need = to occasionally transport protocols like T.140, MSRP, BFCP, and/or RTSP in = some cases, and the primary options are to transport them over DataChannels= or WebSockets. A network server will be needed to do transport level inte= rworking, of course. It would be useful in these cases to have an SDES opt= ion for DataChannels. Not essential, but useful. End-to-end security is n= ot even an issue in this case due to the need for transport level interwork= ing. =20 > -----Original Message----- > From: Adam Roach [mailto:adam@nostrum.com] > Sent: Thursday, April 25, 2013 5:20 PM > To: Martin Thomson > Cc: Ejzak, Richard P (Richard); rtcweb@ietf.org > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb >=20 > On 4/25/13 17:11, Martin Thomson wrote: > > Data channels can continue to use DTLS even though media is encrypted > > using keys provided by security descriptions. >=20 > The arguments for SDES fall into two categories, AFAICT: (1) Those > required for interop with legacy devices, and (2) those which we are > prohibited by RFC 2804 from considering. And there is no possible way > DataChannels are going to interop with legacy devices. >=20 > I agree with Alan that we shouldn't make accommodations to use SDES for > the brower-to-browser case. By implication, this means that the > presence of DataChannels necessarily means that we're using DTLS-SRTP > for the whole session. Given those assumptions, the mixed-session > scenario you describe does not arise. >=20 > /a From martin.thomson@gmail.com Thu Apr 25 16:01:32 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3131B21F9729 for ; Thu, 25 Apr 2013 16:01:32 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.3 X-Spam-Level: X-Spam-Status: No, score=-1.3 tagged_above=-999 required=5 tests=[AWL=1.300, BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hS-t2hqiDdqo for ; Thu, 25 Apr 2013 16:01:31 -0700 (PDT) Received: from mail-we0-x231.google.com (mail-we0-x231.google.com [IPv6:2a00:1450:400c:c03::231]) by ietfa.amsl.com (Postfix) with ESMTP id 564BF21F96F8 for ; Thu, 25 Apr 2013 16:01:31 -0700 (PDT) Received: by mail-we0-f177.google.com with SMTP id s47so2268330wey.8 for ; Thu, 25 Apr 2013 16:01:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type:content-transfer-encoding; bh=kaAXIOF2lRd9DxPhRfOPOCtvyj7IbBmJf71mBMicU5w=; b=Uyr/2smyJqsEUnmBoud4/Udek+qLenRSOuKRXSS8ejUpmeQ+JP6M5LTY4/Tt0h/IRC F+3r+BUL7hoF0MDz1f1x8eTRJhe7gAFNgLWgNWHdPPrhFCIS2NAqE/ocYNFO5fQINqip guz7opaGRvo1iVFEzgs4snmuhVyF1oIRkDntbdem354n+nlz5aQW7hQVwWsBoDY4BR2j yrG8Wgl59uSI8xdJPg3jdLzK6LcLV6SWMug7+vIOOkZfGlrMf5CYhM7ug7oH2JvyBJVb tV3TCZgaoalK4OXMML6Fxj+oJyz5F7ubd8k+2rzZTVG7f7z6tMyYI75arLtmafzvocIn ei8g== MIME-Version: 1.0 X-Received: by 10.180.198.49 with SMTP id iz17mr557268wic.19.1366930890543; Thu, 25 Apr 2013 16:01:30 -0700 (PDT) Received: by 10.194.33.102 with HTTP; Thu, 25 Apr 2013 16:01:30 -0700 (PDT) In-Reply-To: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> Date: Thu, 25 Apr 2013 16:01:30 -0700 Message-ID: From: Martin Thomson To: Cullen Jennings Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 23:01:32 -0000 The case for SDES has thus far been summarized as (borrowing Adam's words): (1) Those required for interop with legacy devices, and (2) those which we are prohibited by RFC 2804 from considering. Reason (1) is a fairly big deal. There are other reasons: Performance - A DTLS handshake takes a fair bit of CPU time, especially on the passive (server) peer, and two round trips. The CPU cost might not be that big of a deal (SBC vendors may disagree), but round trips hurt. Conferencing Scenarios - Ensuring that streams can be mixed, translated and still decoded for a multi-leg conference is just easier with security descriptions. It's true that conferencing scenarios can be addressed by EKT, but EKT has similar 2804 properties as security descriptions. It would not be permissible to use EKT for a peer identity bound session because it makes the media accessible to signaling intermediaries (read: the web site). As long as you are in that state, EKT doesn't really provide that much. Bid-down protection seems lame when the site has access to the keys. Practical Matters of Security - You aren't necessarily more secure because you are using DTLS-SRTP. The complete security story requires not just DTLS-SRTP, but also that both peers use identity assertions. Otherwise its security properties are basically the same as security descriptions. The default mode of operation for getUserMedia is to return media that is accessible to the web site. The same for RTCPeerConnection. That means that the site can see and modify your media in your browser, even if it can't tamper with it on the network. I'm sympathetic to having DTLS-SRTP available to enable these secure scenarios. That's not at issue. But the reasons for DTLS-SRTP only largely come down to just having less code. And seriously, it's not even that much less. On 25 April 2013 08:57, Cullen Jennings wrote: > > The working groups committed some time ago to have a further discussion o= n whether SDP Security Descriptions (RFC 4568 aka SDES) would be usable as = a keying method for WebRTC. As we prepare for that discussion, we'd like t= o have expressions of interest or support for that approach which indicate = the general outlines of support proposed. If you wish to make such an expr= ession of support, please send it to the chairs or the list. > > Cullen, Magnus, & Ted > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From martin.thomson@gmail.com Thu Apr 25 16:06:49 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 91B7B21F9726 for ; Thu, 25 Apr 2013 16:06:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.734 X-Spam-Level: X-Spam-Status: No, score=-1.734 tagged_above=-999 required=5 tests=[AWL=0.866, BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8X+7eh4KFNyC for ; Thu, 25 Apr 2013 16:06:49 -0700 (PDT) Received: from mail-wi0-x233.google.com (mail-wi0-x233.google.com [IPv6:2a00:1450:400c:c05::233]) by ietfa.amsl.com (Postfix) with ESMTP id C38EC21F9722 for ; Thu, 25 Apr 2013 16:06:48 -0700 (PDT) Received: by mail-wi0-f179.google.com with SMTP id l13so13593wie.12 for ; Thu, 25 Apr 2013 16:06:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=I2mW/F6Cd8bGqIctKbBTYC+xqaK+XbjGVwSj4hy+PGs=; b=aDxYcqEHGeis6qNSg3qoE2tdbLYsyBvjdbPcIODyQo1mZd1MVT2c+XrNjqRsMHPrgh iZRwfnUl1ZXs3ibF6PHJcIJxF6Hb4PxkGy8glovXu7otv724jYMdbUusm5CeoBBHsyk/ hBbNmDih6HuBp28EZWSelbmnukn7XEcgh7VLrdiWkfHJMOduncYXnjpRniOYz5SzxOYG 9XPyxnGWahGsG83BTookOAdX55PqBbMXM6pURIgsDGkDt905B/3CWxDJ30+Rhg923wXH BLb+R4uGs4NNEMoWbh5oW/8t5BH3ScRWZEQeJvZM6RoVX+J1v1NCqqI3jcx0HDHgS1PS LMZQ== MIME-Version: 1.0 X-Received: by 10.180.94.133 with SMTP id dc5mr983924wib.1.1366931207969; Thu, 25 Apr 2013 16:06:47 -0700 (PDT) Received: by 10.194.33.102 with HTTP; Thu, 25 Apr 2013 16:06:47 -0700 (PDT) In-Reply-To: <201304252220.r3PMKUjt3433388@shell01.TheWorld.com> References: <066.4c5db43349d3176acaa90d17617a02d6@trac.tools.ietf.org> <5173ECC7.7020909@jitsi.org> <51754363.3090300@ericsson.com> <201304222215.r3MMFqsE3199256@shell01.TheWorld.com> <201304231858.r3NIw4OJ3260483@shell01.TheWorld.com> <201304252220.r3PMKUjt3433388@shell01.TheWorld.com> Date: Thu, 25 Apr 2013 16:06:47 -0700 Message-ID: From: Martin Thomson To: "Dale R. Worley" Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #15: Section 4.8: SSRC signaling X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 23:06:49 -0000 On 25 April 2013 15:20, Dale R. Worley wrote: > I was working on an essay based on the assumption that a single video > capture is carried over a single m= line (with the various component > streams (simulcast, FEC, layered encoding, etc.) sent using different > SSRCs)... But that isn't how existing systems work, and it may not be > workable at all. It would be nice to correct that, but that probably > isn't the quick way to get products to market. ;-) Unless you count Lync. It uses one m= line for a capture/source/hobbit, including layering and FEC. It's totally workable. The signaling that Lync uses might cause mild discomfort or bleeding from the ears for some implementations, but it can work. > Each SSRC is demultiplexed based on an RTCP SDES item that gives > the mapping between the SSRC and the m= line via which it is > presented to the application layer (that is, the constituent m= > line sequence number). It's been proposed. I don't know exactly why it wasn't considered worth pursuing. Maybe you can ask Peter Thatcher to share his document on demux. It's a reasonable taxonomy of the available options. Better than what I'm able to write up in a short time. From ekr@rtfm.com Thu Apr 25 16:20:04 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B86F921F971B for ; Thu, 25 Apr 2013 16:20:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -96.398 X-Spam-Level: X-Spam-Status: No, score=-96.398 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FH_RELAY_NODNS=1.451, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_XBL=3.033, RDNS_NONE=0.1, RELAY_IS_203=0.994, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mcrOt45p3jL9 for ; Thu, 25 Apr 2013 16:20:03 -0700 (PDT) Received: from mail-qc0-x22e.google.com (mail-qc0-x22e.google.com [IPv6:2607:f8b0:400d:c01::22e]) by ietfa.amsl.com (Postfix) with ESMTP id C5A2721F9708 for ; Thu, 25 Apr 2013 16:20:01 -0700 (PDT) Received: by mail-qc0-f174.google.com with SMTP id z24so1839026qcq.33 for ; Thu, 25 Apr 2013 16:20:01 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:x-originating-ip:in-reply-to:references :from:date:message-id:subject:to:cc:content-type:x-gm-message-state; bh=mOnq1Nd4X7aK0i2AyS9i07jCRYN/NFc1xUgPhx1onRY=; b=c5zreYsIXHrwygHm8gdCeTdkHdGkNmZQ6R7zbE8KV43rCnJEblRuGsigx7cbMtVGOs jeB/45lNy8Y/7EJoQ0grhYucqNIgNJfQagy8c2Za4k8Tbe/kwpqmktsaFWeUTIjn/CVE GoTRiCWj2jAr6dpK2VEdRdsPpHc8TDWLYjiVe32gVduAIDMM0cPghkzhZ8L+VQU3AxVb msBZyI9ensRVZ6sUe7FPVjdD9fmYzuV4qDaDknmqGIJOdLJLIdtz/lnBkw7bk7TbbkgQ 4dChNYsTGFfpM2rreV81Eg43bmgOLZwrDVOwTha1e8HZO8crvCHLBiWJCPCg9G6KwM50 lQHQ== X-Received: by 10.224.147.194 with SMTP id m2mr37063848qav.52.1366932001203; Thu, 25 Apr 2013 16:20:01 -0700 (PDT) MIME-Version: 1.0 Received: by 10.49.17.66 with HTTP; Thu, 25 Apr 2013 16:19:21 -0700 (PDT) X-Originating-IP: [203.69.99.17] In-Reply-To: References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> From: Eric Rescorla Date: Thu, 25 Apr 2013 16:19:21 -0700 Message-ID: To: Martin Thomson Content-Type: multipart/alternative; boundary=089e0158b35a5d54b404db37a818 X-Gm-Message-State: ALoCoQm1CURIMDl/Ev9PtrQRylV2xVK7JCwjriSiSc/4pCSWsvD8pjBnlCFn+aOP427yZun5V7cb Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 23:20:04 -0000 --089e0158b35a5d54b404db37a818 Content-Type: text/plain; charset=ISO-8859-1 On Thu, Apr 25, 2013 at 4:01 PM, Martin Thomson wrote: [snip] I think we've discussed most of the topics Martin raises already and I'm not sure I have much to add (which isn't to say I necessarily agree). However, I think the below is incorrect and I'm not sure I have made that point before. Practical Matters of Security - You aren't necessarily more secure > because you are using DTLS-SRTP. The complete security story requires > not just DTLS-SRTP, but also that both peers use identity assertions. > Otherwise its security properties are basically the same as security > descriptions. > > The default mode of operation for getUserMedia is to return media that > is accessible to the web site. The same for RTCPeerConnection. That > means that the site can see and modify your media in your browser, > even if it can't tamper with it on the network. It's certainly true that the site has access to the media with DTLS if you don't use identity assertions/isolated streams. However, what it doesn't have is *invisible* access. I.e., it must do something that is user visible, which allows for the detection of cheating by the site. By contrast, if SDES is used then the site can simply passively monitor all your traffic, or at least any that goes through its network and you can't detect it. -Ekr --089e0158b35a5d54b404db37a818 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Thu, Apr 25, 2013 at 4:01 PM, Martin Thomson <martin.thomson@gma= il.com> wrote:
[snip]

I think we= 've discussed most of the topics Martin raises already and I'm
not sure I have much to add (which isn't to say I necessarily agre= e).

However, I think the below is incorrect and I&= #39;m not sure I have made
that point before.


Practical Matters of Security - You aren't necessarily more secure
because you are using DTLS-SRTP. =A0The complete security story requires not just DTLS-SRTP, but also that both peers use identity assertions.
Otherwise its security properties are basically the same as security
descriptions.

The default mode of operation for getUserMedia is to return media that
is accessible to the web site. =A0The same for RTCPeerConnection. =A0That means that the site can see and modify your media in your browser,
even if it can't tamper with it on the network.

It's certainly true that the site has access to the media with= DTLS if you
don't use identity assertions/isolated streams. = However, what it doesn't
have is *invisible* access. I.e., it must do something that is user vi= sible,
which allows for the detection of cheating by the site. By= contrast, if SDES is used
then the site can simply passively mon= itor all your traffic, or at least
any that goes through its network and you can't detect it.

-Ekr

--089e0158b35a5d54b404db37a818-- From randell-ietf@jesup.org Thu Apr 25 16:33:53 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 75D7B21F93B1 for ; Thu, 25 Apr 2013 16:33:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.3 X-Spam-Level: X-Spam-Status: No, score=-1.3 tagged_above=-999 required=5 tests=[AWL=1.300, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id z7RdGMiQ0YRx for ; Thu, 25 Apr 2013 16:33:53 -0700 (PDT) Received: from r2-chicago.webserversystems.com (r2-chicago.webserversystems.com [173.236.101.58]) by ietfa.amsl.com (Postfix) with ESMTP id E957021F9361 for ; Thu, 25 Apr 2013 16:33:52 -0700 (PDT) Received: from pool-98-111-140-34.phlapa.fios.verizon.net ([98.111.140.34]:3409 helo=[192.168.1.12]) by r2-chicago.webserversystems.com with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.80) (envelope-from ) id 1UVVfk-00064j-B5 for rtcweb@ietf.org; Thu, 25 Apr 2013 18:33:52 -0500 Message-ID: <5179BD66.6000303@jesup.org> Date: Thu, 25 Apr 2013 19:33:58 -0400 From: Randell Jesup User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - r2-chicago.webserversystems.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - jesup.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 23:33:53 -0000 On 4/25/2013 7:19 PM, Eric Rescorla wrote: > On Thu, Apr 25, 2013 at 4:01 PM, Martin Thomson > > wrote: > [snip] > > The default mode of operation for getUserMedia is to return media that > is accessible to the web site. The same for RTCPeerConnection. That > means that the site can see and modify your media in your browser, > even if it can't tamper with it on the network. > > > It's certainly true that the site has access to the media with DTLS if you > don't use identity assertions/isolated streams. However, what it doesn't > have is *invisible* access. I.e., it must do something that is user > visible, > which allows for the detection of cheating by the site. By contrast, > if SDES is used > then the site can simply passively monitor all your traffic, or at least > any that goes through its network and you can't detect it. > Or they can simply store off the key to be used to offline-decrypt raw traffic captured at an ISP, at their leisure. SDES is basically "protect against WiFi sniffers" encryption. Ironically, Apple's messaging stuff apparently uses strong end-to-end encryption (the wonders of not caring about legacy interop). -- Randell Jesup randell-ietf@jesup.org From martin.thomson@gmail.com Thu Apr 25 16:34:14 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3E29521F9736 for ; Thu, 25 Apr 2013 16:34:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SmMMBDxdvU9R for ; Thu, 25 Apr 2013 16:34:13 -0700 (PDT) Received: from mail-we0-x22d.google.com (mail-we0-x22d.google.com [IPv6:2a00:1450:400c:c03::22d]) by ietfa.amsl.com (Postfix) with ESMTP id 9161721F9690 for ; Thu, 25 Apr 2013 16:34:07 -0700 (PDT) Received: by mail-we0-f173.google.com with SMTP id o7so3076629wea.18 for ; Thu, 25 Apr 2013 16:34:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=oWPwmuaIhajwpiTtATtIAIGHyLwdgiprnLcVVFTr9V8=; b=LwGhrYM0hXUTnLinqUMoGA/QIcNfM2hJzUNLkatzsfKNsncekRxKNzxcsAMvPTKYdf gHfiRvpxB4cObMUMUYGY/F8kXSOuSGw5KNVWThGibFJyyz3peZSVN1tp9fa+FV2gXr0i 9Rskzvm1BFXuQiMmngsTkUJuOmi8QPOLeccOmik0Hs+TyCqUK8TiLi/YuxM8NbyyC7Qq D4oFTd5mRN+zcB+RRQSgxnwiTGJ+Ey3aXI+jcwMtdpnjCtO8WC63RQA026/GOmF9Xn4J 8+zCpbvS28ANVfuzcAK7AqZxQ0hGCd8l161VsWoT1iJ3A3FqdRZx0dV/KnJbcjkAFfQ1 J26Q== MIME-Version: 1.0 X-Received: by 10.194.109.227 with SMTP id hv3mr14596196wjb.32.1366932846722; Thu, 25 Apr 2013 16:34:06 -0700 (PDT) Received: by 10.194.33.102 with HTTP; Thu, 25 Apr 2013 16:34:06 -0700 (PDT) In-Reply-To: References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> Date: Thu, 25 Apr 2013 16:34:06 -0700 Message-ID: From: Martin Thomson To: Eric Rescorla Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 23:34:14 -0000 On 25 April 2013 16:19, Eric Rescorla wrote: > I think we've discussed most of the topics Martin raises already and I'm > not sure I have much to add (which isn't to say I necessarily agree). I just wanted them on the record. > However, I think the below is incorrect and I'm not sure I have made > that point before. > >> Practical Matters of Security - You aren't necessarily more secure >> because you are using DTLS-SRTP. The complete security story requires >> not just DTLS-SRTP, but also that both peers use identity assertions. >> Otherwise its security properties are basically the same as security >> descriptions. >> >> The default mode of operation for getUserMedia is to return media that >> is accessible to the web site. The same for RTCPeerConnection. That >> means that the site can see and modify your media in your browser, >> even if it can't tamper with it on the network. > > It's certainly true that the site has access to the media with DTLS if you > don't use identity assertions/isolated streams. However, what it doesn't > have is *invisible* access. I.e., it must do something that is user visible, > which allows for the detection of cheating by the site. By contrast, if SDES > is used > then the site can simply passively monitor all your traffic, or at least > any that goes through its network and you can't detect it. That's a fair point, and one I missed. My bad. But it's only relevant to the extent that it is possible to observe that the provided certificate is a phony. It's not like the server is obligated to provide a particular CN, so it's mostly down to just looking at fingerprints. It's also hard to retroactively audit due to the way (current) implementations mint new certificates for every interaction. I'm fairly sure that (current) implementations don't make this particularly easy to examine in browser chrome, but even if they did it's hard to imagine a good usability story for accessing the information. From randell-ietf@jesup.org Thu Apr 25 16:40:34 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 072A921F9737 for ; Thu, 25 Apr 2013 16:40:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.949 X-Spam-Level: X-Spam-Status: No, score=-1.949 tagged_above=-999 required=5 tests=[AWL=0.650, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id q4FzOuVOKUgK for ; Thu, 25 Apr 2013 16:40:33 -0700 (PDT) Received: from r2-chicago.webserversystems.com (r2-chicago.webserversystems.com [173.236.101.58]) by ietfa.amsl.com (Postfix) with ESMTP id 0173B21F9724 for ; Thu, 25 Apr 2013 16:40:26 -0700 (PDT) Received: from pool-98-111-140-34.phlapa.fios.verizon.net ([98.111.140.34]:3423 helo=[192.168.1.12]) by r2-chicago.webserversystems.com with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.80) (envelope-from ) id 1UVVm5-00084W-MU for rtcweb@ietf.org; Thu, 25 Apr 2013 18:40:25 -0500 Message-ID: <5179BEEF.4000600@jesup.org> Date: Thu, 25 Apr 2013 19:40:31 -0400 From: Randell Jesup User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - r2-chicago.webserversystems.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - jesup.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 23:40:34 -0000 On 4/25/2013 4:27 PM, Matthew Kaufman (SKYPE) wrote: > I agree. The ability to set the cipher suite and keys from JavaScript is critical for certain applications. SDES is the best we'll get with SDP as the API. DTLS-SRTP-only would be unacceptably limiting. So, the problems with SDES (discussed to a fare-the-well every 3 months for the last 1.75 years or more, so there's nothing really new here): It exposes security keys directly to the application (or takes them from there). Basically, you're back in "all your media is totally in trust to the application and website". The keys aren't even end-2-end encrypted or even authenticated. And even if you expose SDES bid-downs to the user, they don't know what they mean or how to process this information. SDES basically means to me "secure against random WiFi sniffers at the coffeeshop", and little more than that. I realize carriers and others like SDES because they make certain uses and obligations easy for them to meet, and interop with legacy devices and systems easier (though many such legacy interop systems will perforce need gateways anyways, and those gateways can convert from DTLS-SRTP to SDES. Yes, some gateway scenarios might be cheaper/easier with SDES, but I see the primary use-cases for WebRTC to be browser-to-browser, not browser-legacy. Certainly some large organizations are built around the VoIP/net to legacy equipment/PSTN/PBX use-case, and certainly they would find SDES easier. But I think we need to weigh that against the longer term, and the interests of the users (not the providers) -- the users aren't generally at this table; the IETF is full of people who almost by definition work for the companies that provide data and services. (Not everyone, but most.) I realize there are some (many) who have business/organizational/political reasons to avoid end-2-end encryption. However, per IETF norms (RFC 2084) we should not be letting that decide this issue. It's tough to find a way to allow SDES in the "connect to a gateway that will decrypt anyways" case, while also avoid bid-down attacks on browser-browser communication. (and EKT has some of the same key control issues) We can say "we enforce DTLS-SRTP only for secure, authenticated" calls like ekr presented (with media tainting, etc) - but that mode isn't the default and really can't be/won't be for many users and applications, making it at best an obscure option for most people. An app (or browser chrome) could put a "renegotiate/re-encrypt NOW with only DTLS-SRTP" button up, but I doubt most apps would bother, and it might be a struggle to get all browsers to include such an option I suspect. And even that might/would be hard to convey to users. But maybe that's the best we can do. If so, it's a sad day we can't collectively figure out something better. -- Randell Jesup randell-ietf@jesup.org From martin.thomson@gmail.com Thu Apr 25 16:40:49 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 67EE221F973B for ; Thu, 25 Apr 2013 16:40:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UfjuxeYLM+Oe for ; Thu, 25 Apr 2013 16:40:49 -0700 (PDT) Received: from mail-wi0-x22a.google.com (mail-wi0-x22a.google.com [IPv6:2a00:1450:400c:c05::22a]) by ietfa.amsl.com (Postfix) with ESMTP id A8D9921F9738 for ; Thu, 25 Apr 2013 16:40:48 -0700 (PDT) Received: by mail-wi0-f170.google.com with SMTP id l13so106900wie.1 for ; Thu, 25 Apr 2013 16:40:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=KE6qTBW1st1UIe+Rgbl0/6kSBVJPt0IZ//nZWUdZHVQ=; b=WcON7QEKaEeZncjmnU3WkxepW7Qqkpm8R7OpW47EL3ylsqwYkZm1xO19AEpDKNrO2L RE9nAhuW7MdJKEmhlGDMWcxcDnnc584+Iu1+dG8nijrtjWLSBZId+64jPpPjc1szmSfd lpNAxZuUhTYQGoRrHu6eqvYVZ16qUdtJYd8KT1iw0tG9hxVT+YXP1ytDlXHRGvOmyXgO WCSWkgxAyZggHoF3OW9sKkk8Tf4YsWIO5jo6hJ2BM+OnT9DjawEFS//Ig8fHI/75I9Pn 0AEQ1KU5wp2Y6JHVdJQ0TP0VNkeL6rY87NQ9bKs6mztCk5936MO3A5NQk3gGatuFPDDy bS5g== MIME-Version: 1.0 X-Received: by 10.180.198.49 with SMTP id iz17mr659186wic.19.1366933247820; Thu, 25 Apr 2013 16:40:47 -0700 (PDT) Received: by 10.194.33.102 with HTTP; Thu, 25 Apr 2013 16:40:47 -0700 (PDT) In-Reply-To: <5179BD66.6000303@jesup.org> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <5179BD66.6000303@jesup.org> Date: Thu, 25 Apr 2013 16:40:47 -0700 Message-ID: From: Martin Thomson To: Randell Jesup Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 23:40:49 -0000 On 25 April 2013 16:33, Randell Jesup wrote: > SDES is basically "protect against WiFi sniffers" encryption. I wondered when this characterization would resurface. It's a really bad one. SDES protects your communications from everyone except the website and anyone they choose to send it to. It's no different to using DTLS-SRTP to send data directly to a server that presents the sites domain certificate. It's exactly equivalent to allowing getUserMedia with peerIdentity constraint (and that other one I can't ever remember the name of). Whether this is acceptable depends on your threat model. From dwing@cisco.com Thu Apr 25 17:28:38 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A457921F8EE6 for ; Thu, 25 Apr 2013 17:28:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -109.3 X-Spam-Level: X-Spam-Status: No, score=-109.3 tagged_above=-999 required=5 tests=[AWL=1.300, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KkcwPrkfrwCE for ; Thu, 25 Apr 2013 17:28:37 -0700 (PDT) Received: from mtv-iport-4.cisco.com (mtv-iport-4.cisco.com [173.36.130.15]) by ietfa.amsl.com (Postfix) with ESMTP id AB2C521F8E7A for ; Thu, 25 Apr 2013 17:28:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=3464; q=dns/txt; s=iport; t=1366936117; x=1368145717; h=mime-version:subject:from:in-reply-to:date:cc: content-transfer-encoding:message-id:references:to; bh=0PKNqJNk3zbeB+7f1eNxeCuKsqTvxvO4VnTpqELj9hU=; b=Hf7j2mXay/HKPMXeYthZEAQ055FbAJ05eVwe/K1W23YxuGk0xVinIGEl M2h6+6iuONq686rVJwXYFw61b+7g0BVu9f84wnovuYFrjC6TgVm7xU0Ou wfN2Pqs0KlKOl3nUxhpG+bW/1ep5kSDkctGsrbUti6/8H4vgKd1UKWQS0 U=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgMFAI7JeVGrRDoI/2dsb2JhbABICYMGNgG+MIEFFnSCHwEBAQMBAQEBNy4GCwULCxguIQYwBhOIAgMJBQ21cQ2ISQSMX4EbgQgzB4JtYQOJEYwngWSGD4V0hR+DLhw X-IronPort-AV: E=Sophos;i="4.87,553,1363132800"; d="scan'208";a="79569664" Received: from mtv-core-3.cisco.com ([171.68.58.8]) by mtv-iport-4.cisco.com with ESMTP; 26 Apr 2013 00:28:36 +0000 Received: from [10.32.240.196] ([10.32.240.196]) by mtv-core-3.cisco.com (8.14.5/8.14.5) with ESMTP id r3Q0SZot013325; Fri, 26 Apr 2013 00:28:35 GMT Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) From: Dan Wing In-Reply-To: Date: Thu, 25 Apr 2013 17:28:35 -0700 Content-Transfer-Encoding: quoted-printable Message-Id: References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> To: Martin Thomson X-Mailer: Apple Mail (2.1503) Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 00:28:38 -0000 On Apr 25, 2013, at 4:01 PM, Martin Thomson = wrote: > The case for SDES has thus far been summarized as (borrowing Adam's = words): >=20 > (1) Those required for interop with legacy devices, and > (2) those which we are prohibited by RFC 2804 from considering. >=20 > Reason (1) is a fairly big deal. There are other reasons: >=20 > Performance - A DTLS handshake takes a fair bit of CPU time, > especially on the passive (server) peer, and two round trips. The CPU > cost might not be that big of a deal (SBC vendors may disagree), but > round trips hurt. Yes. But major web sites seem to accept the performance penalty of the = TLS handshake, both CPU hit and round trips. > Conferencing Scenarios - Ensuring that streams can be mixed, > translated and still decoded for a multi-leg conference is just easier > with security descriptions. >=20 > It's true that conferencing scenarios can be addressed by EKT, but EKT > has similar 2804 properties as security descriptions. It would not be > permissible to use EKT for a peer identity bound session because it > makes the media accessible to signaling intermediaries (read: the web > site). To the contrary -- EKT is protected by the DTLS-SRTP key, which is not = known to the web site (or SIP proxies). > As long as you are in that state, EKT doesn't really provide that > much. Bid-down protection seems lame when the site has access to the > keys. Yes, it is lame if the site has access to the keys. That is why I don't = want Security Descriptions used with RTCWEB. > Practical Matters of Security - You aren't necessarily more secure > because you are using DTLS-SRTP. The complete security story requires > not just DTLS-SRTP, but also that both peers use identity assertions. > Otherwise its security properties are basically the same as security > descriptions. Agreed. And DTLS-SRTP provides the foundation to build such a system. = Security Descriptions does not provide a foundation to build such a = system. > The default mode of operation for getUserMedia is to return media that > is accessible to the web site. The same for RTCPeerConnection. That > means that the site can see and modify your media in your browser, > even if it can't tamper with it on the network. >=20 > I'm sympathetic to having DTLS-SRTP available to enable these secure > scenarios. That's not at issue. But the reasons for DTLS-SRTP only > largely come down to just having less code. And seriously, it's not > even that much less. -d > On 25 April 2013 08:57, Cullen Jennings wrote: >>=20 >> The working groups committed some time ago to have a further = discussion on whether SDP Security Descriptions (RFC 4568 aka SDES) = would be usable as a keying method for WebRTC. As we prepare for that = discussion, we'd like to have expressions of interest or support for = that approach which indicate the general outlines of support proposed. = If you wish to make such an expression of support, please send it to the = chairs or the list. >>=20 >> Cullen, Magnus, & Ted >>=20 >>=20 >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From dwing@cisco.com Thu Apr 25 17:36:22 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DAC3D21F9668 for ; Thu, 25 Apr 2013 17:36:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -109.949 X-Spam-Level: X-Spam-Status: No, score=-109.949 tagged_above=-999 required=5 tests=[AWL=0.650, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ys-HmEWpXJ+R for ; Thu, 25 Apr 2013 17:36:22 -0700 (PDT) Received: from mtv-iport-1.cisco.com (mtv-iport-1.cisco.com [173.36.130.12]) by ietfa.amsl.com (Postfix) with ESMTP id 6019721F9758 for ; Thu, 25 Apr 2013 17:36:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2970; q=dns/txt; s=iport; t=1366936580; x=1368146180; h=mime-version:subject:from:in-reply-to:date:cc: content-transfer-encoding:message-id:references:to; bh=C34Bpb6KioTH4PHjzX8vXRmQjFzNtt9gRJDhg01rOOs=; b=Orz50NzZX/xdTLHEfPEPspj1k66iHlDE1oCXf2idNtLrmRfgEfJW+T0D Wd9WpPTzyWn/DhCwjNDLZ5DZHz4Zb12A3yJxi2yibq4Hp9eZSQH+nLOnJ KXMmmt+IJrYwo3j5Cz68gRTZRv9SAq3kSXFkLcuJ0mjbpZD7bgy6Jwk9b g=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgMFABjLeVGrRDoG/2dsb2JhbABICYMGNgG+MIEGFnSCHwEBAQMBAQEBNzQLBQsLGC4hBjAGE4gCAwkFDbVvDYhNjF+BChGBCDMHgm1hA4kRjCeBZIYPhXSFH4MuHIEwBxcG X-IronPort-AV: E=Sophos;i="4.87,553,1363132800"; d="scan'208";a="76546393" Received: from mtv-core-1.cisco.com ([171.68.58.6]) by mtv-iport-1.cisco.com with ESMTP; 26 Apr 2013 00:36:10 +0000 Received: from [10.32.240.196] ([10.32.240.196]) by mtv-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id r3Q0a9XD005650; Fri, 26 Apr 2013 00:36:09 GMT Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) From: Dan Wing In-Reply-To: Date: Thu, 25 Apr 2013 17:36:09 -0700 Content-Transfer-Encoding: quoted-printable Message-Id: <0C0C05DA-C283-40CF-A7CA-BF5F27A21720@cisco.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> To: Martin Thomson X-Mailer: Apple Mail (2.1503) Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 00:36:23 -0000 On Apr 25, 2013, at 4:34 PM, Martin Thomson = wrote: > On 25 April 2013 16:19, Eric Rescorla wrote: >> I think we've discussed most of the topics Martin raises already and = I'm >> not sure I have much to add (which isn't to say I necessarily agree). >=20 > I just wanted them on the record. >=20 >> However, I think the below is incorrect and I'm not sure I have made >> that point before. >>=20 >>> Practical Matters of Security - You aren't necessarily more secure >>> because you are using DTLS-SRTP. The complete security story = requires >>> not just DTLS-SRTP, but also that both peers use identity = assertions. >>> Otherwise its security properties are basically the same as security >>> descriptions. >>>=20 >>> The default mode of operation for getUserMedia is to return media = that >>> is accessible to the web site. The same for RTCPeerConnection. = That >>> means that the site can see and modify your media in your browser, >>> even if it can't tamper with it on the network. >>=20 >> It's certainly true that the site has access to the media with DTLS = if you >> don't use identity assertions/isolated streams. However, what it = doesn't >> have is *invisible* access. I.e., it must do something that is user = visible, >> which allows for the detection of cheating by the site. By contrast, = if SDES >> is used >> then the site can simply passively monitor all your traffic, or at = least >> any that goes through its network and you can't detect it. >=20 > That's a fair point, and one I missed. My bad. But it's only > relevant to the extent that it is possible to observe that the > provided certificate is a phony. It's not like the server is > obligated to provide a particular CN, so it's mostly down to just > looking at fingerprints. Or storing fingerprints into an addressbook (similar to HTTPS key = pinning), cooperatively comparing fingerprints (similar to = http://perspectives-project.org), and the rest of the state of the art = and emerging state of the art for certificate validation. >=20 > It's also hard to retroactively audit due to the way (current) > implementations mint new certificates for every interaction. =20 That is probably done for privacy, because otherwise the client and the = server's identities are shown in the media path during the DTLS = certificate exchange. That needs to be wrapped with a separate key or, = as you have seen, new certificates have to be generated for each session = if identity privacy is important. -d > I'm > fairly sure that (current) implementations don't make this > particularly easy to examine in browser chrome, but even if they did > it's hard to imagine a good usability story for accessing the > information. > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From snandaku@cisco.com Thu Apr 25 17:36:48 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 00BA021F9757 for ; Thu, 25 Apr 2013 17:36:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.599 X-Spam-Level: X-Spam-Status: No, score=-10.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9dheIHQ5DUam for ; Thu, 25 Apr 2013 17:36:47 -0700 (PDT) Received: from rcdn-iport-6.cisco.com (rcdn-iport-6.cisco.com [173.37.86.77]) by ietfa.amsl.com (Postfix) with ESMTP id 6180421F9668 for ; Thu, 25 Apr 2013 17:36:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2448; q=dns/txt; s=iport; t=1366936607; x=1368146207; h=from:to:subject:date:message-id:references:in-reply-to: content-transfer-encoding:mime-version; bh=PJ4jDNKL0+IVDDBXFn5RuLs/XLxUTOxHwIoRGFA9pHc=; b=jXNgGKR1PqICHfHtCeayO98jSz/+i1YpAa7O3rEEMo8oHBKEYsHbFrT4 rDI8exc+A7ymcyr7fmv4mbPreI2uTMXSmSubyi+UkUZkCWNCG/mPQglYG krh+1aH2R51h7HDf2fVhtFhq9MxxNlHuv1si6NGm3eFaZxLUbaka1ohbL Y=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AmQGANPLeVGtJV2d/2dsb2JhbABRgwY2RL1tgQYWbQeCHwEBAQQ6PRICAQgRBAEBCxQQMhsBAQUDAgQTCAGICwcFvkuPBDiCbWEDmEGPfYFYgTaCKA X-IronPort-AV: E=Sophos;i="4.87,553,1363132800"; d="scan'208";a="203231946" Received: from rcdn-core-6.cisco.com ([173.37.93.157]) by rcdn-iport-6.cisco.com with ESMTP; 26 Apr 2013 00:36:38 +0000 Received: from xhc-rcd-x05.cisco.com (xhc-rcd-x05.cisco.com [173.37.183.79]) by rcdn-core-6.cisco.com (8.14.5/8.14.5) with ESMTP id r3Q0acAK028019 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Fri, 26 Apr 2013 00:36:38 GMT Received: from xmb-aln-x12.cisco.com ([169.254.7.81]) by xhc-rcd-x05.cisco.com ([173.37.183.79]) with mapi id 14.02.0318.004; Thu, 25 Apr 2013 19:36:37 -0500 From: "Suhas Nandakumar (snandaku)" To: "rtcweb@ietf.org" Thread-Topic: New Version Notification for draft-nandakumar-mmusic-sdp-mux-attributes-02.txt Thread-Index: AQHOQhU7cac0mmykU0KibZqhF01UdZjnpueY Date: Fri, 26 Apr 2013 00:36:37 +0000 Message-ID: <37D91FC30D69DE43B61E5EEADD959F1807CB3BCE@xmb-aln-x12.cisco.com> References: <20130426003015.5595.11202.idtracker@ietfa.amsl.com> In-Reply-To: <20130426003015.5595.11202.idtracker@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.154.37.247] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: [rtcweb] FW: New Version Notification for draft-nandakumar-mmusic-sdp-mux-attributes-02.txt X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 00:36:48 -0000 Hello All=0A= =0A= A new version of the SDP Attribute Multiplex Draft has been submitted for= your perusal.=0A= =0A= The changes include =0A= - clarifying the categories with examples=0A= - cleaning up category names.=0A= - few nits overall.=0A= =0A= Please let us know your thoughts=0A= =0A= Thanks=0A= Suhas=0A= ________________________________________=0A= From: internet-drafts@ietf.org [internet-drafts@ietf.org]=0A= Sent: Thursday, April 25, 2013 5:30 PM=0A= To: Suhas Nandakumar (snandaku)=0A= Subject: New Version Notification for draft-nandakumar-mmusic-sdp-mux-att= ributes-02.txt=0A= =0A= A new version of I-D, draft-nandakumar-mmusic-sdp-mux-attributes-02.txt=0A= has been successfully submitted by Suhas Nandakumar and posted to the=0A= IETF repository.=0A= =0A= Filename: draft-nandakumar-mmusic-sdp-mux-attributes=0A= Revision: 02=0A= Title: A Framework for SDP Attributes when Multiplexing=0A= Creation date: 2013-04-25=0A= Group: Individual Submission=0A= Number of pages: 55=0A= URL: http://www.ietf.org/internet-drafts/draft-nandakumar-mmusi= c-sdp-mux-attributes-02.txt=0A= Status: http://datatracker.ietf.org/doc/draft-nandakumar-mmusic-sd= p-mux-attributes=0A= Htmlized: http://tools.ietf.org/html/draft-nandakumar-mmusic-sdp-mux= -attributes-02=0A= Diff: http://www.ietf.org/rfcdiff?url2=3Ddraft-nandakumar-mmusic= -sdp-mux-attributes-02=0A= =0A= Abstract:=0A= The Session Description Protocol (SDP) provides mechanisms to=0A= describe attributes of multimedia sessions and of individual media=0A= streams (e.g., Real-time Transport Protocol (RTP) sessions) within a=0A= multimedia session. In the RTCWeb WG, there is a need to use a=0A= single 5-tuple for sending and receiving media associated with=0A= multiple media descriptions ("m=3D" lines). Such a requirement has=0A= raised concerns over the semantic implications of the SDP attributes=0A= associated with the RTP Sessions multiplexed over a single transport=0A= layer flow.=0A= =0A= The scope of this specification is to provide a framework for=0A= analyzing the multiplexing characteristics of SDP attributes. The=0A= specification also categorizes existing attributes based on the=0A= framework described herein.=0A= =0A= =0A= =0A= =0A= The IETF Secretariat=0A= =0A= From ekr@rtfm.com Thu Apr 25 18:01:38 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 85BEC21F972E for ; Thu, 25 Apr 2013 18:01:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -96.398 X-Spam-Level: X-Spam-Status: No, score=-96.398 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FH_RELAY_NODNS=1.451, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_XBL=3.033, RDNS_NONE=0.1, RELAY_IS_203=0.994, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7l82GoZxRUTh for ; Thu, 25 Apr 2013 18:01:38 -0700 (PDT) Received: from mail-qc0-x234.google.com (mail-qc0-x234.google.com [IPv6:2607:f8b0:400d:c01::234]) by ietfa.amsl.com (Postfix) with ESMTP id E2BF021F96DD for ; Thu, 25 Apr 2013 18:01:37 -0700 (PDT) Received: by mail-qc0-f180.google.com with SMTP id b40so1831595qcq.25 for ; Thu, 25 Apr 2013 18:01:37 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:x-originating-ip:in-reply-to:references :from:date:message-id:subject:to:cc:content-type:x-gm-message-state; bh=NPzLJvPaj2GleViwwUEis2sEmFzSEXZcc37rtgBL7M8=; b=nOERm6tfkE9/1deWLIzE9hH6RczedR6EVtlMlfS7+P5NQ3dVUUAh1zLRDRs4GI7KMp tOYyO6mQVR9TXxqCHfIphjTk10b2VtlDl2EDqnfMDa/glgNbf7aV+51ejcNK1c7WpSYk hUhSJmTvElCf1U7yDenl1BsWzoc5u8nWJ/9S2oxq5ZLshb2G7VD7lqSoMVKvSckkz46x rBHmcBQaWGZDDm3KdEcM5jsy058Y9XFNpkm2pPsaKUNgcOC5zmjt+TS72c2LfmG901/R kB1SartXA6Dqetc7oTRgr8hvxpgy63NB5cvRlsAo9MBGz/nz3wcCuvM8qp0cB6c9LB6d DGVw== X-Received: by 10.229.151.134 with SMTP id c6mr139866qcw.58.1366938097286; Thu, 25 Apr 2013 18:01:37 -0700 (PDT) MIME-Version: 1.0 Received: by 10.49.17.66 with HTTP; Thu, 25 Apr 2013 18:00:57 -0700 (PDT) X-Originating-IP: [203.69.99.17] In-Reply-To: References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> From: Eric Rescorla Date: Thu, 25 Apr 2013 18:00:57 -0700 Message-ID: To: Martin Thomson Content-Type: multipart/alternative; boundary=14dae94ee2adb8391404db391322 X-Gm-Message-State: ALoCoQnZM07y7pNa3IEqnQnsYUSJCghNydFxbb6DFqIAPXChJHk58Oo0ub8gsN7jcYDVGUEyc4iq Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 01:01:38 -0000 --14dae94ee2adb8391404db391322 Content-Type: text/plain; charset=ISO-8859-1 On Thu, Apr 25, 2013 at 4:34 PM, Martin Thomson wrote: > > It's also hard to retroactively audit due to the way (current) > implementations mint new certificates for every interaction. This is a limitation of current implementations. Expect it to change in the relatively near-term. -Ekr --14dae94ee2adb8391404db391322 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

On Thu, Apr 25, 2013 at 4:34 PM, Martin = Thomson <martin.thomson@gmail.com> wrote:
It's also hard to retroactively audit due to the way (current)
implementations mint new certificates for every interaction.=A0

This is a limitation of current implementations. Expec= t it to change in the relatively
near-term.

-Ekr

--14dae94ee2adb8391404db391322-- From matthew@matthew.at Thu Apr 25 21:03:24 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EABF221F8EEA for ; Thu, 25 Apr 2013 21:03:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.43 X-Spam-Level: X-Spam-Status: No, score=-1.43 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_AT=0.424, HOST_EQ_AT=0.745] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2VuGIOfKGJdy for ; Thu, 25 Apr 2013 21:03:24 -0700 (PDT) Received: from where.matthew.at (where.matthew.at [198.202.199.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7E36021F8E76 for ; Thu, 25 Apr 2013 21:03:24 -0700 (PDT) Received: from [10.10.155.2] (unknown [10.10.155.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by where.matthew.at (Postfix) with ESMTP id 07632230005 for ; Thu, 25 Apr 2013 21:03:22 -0700 (PDT) Message-ID: <5179FC8C.3080600@matthew.at> Date: Thu, 25 Apr 2013 21:03:24 -0700 From: Matthew Kaufman User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 04:03:25 -0000 On 4/25/2013 3:11 PM, Martin Thomson wrote: > On 25 April 2013 14:55, Ejzak, Richard P (Richard) > wrote: >> I also agree that we should support SDES in addition to DTLS-SRTP. >> >> This raises a further question about SCTP/DTLS for DataChannels. It seems that if we support SDES-SRTP, don't we also need to provide an SDES keying mechanism for DataChannels? Ekr: What is needed to realize this? > Data channels use the DTLS record layer, so using SDES for those would > be harder than I think you want. > > Data channels can continue to use DTLS even though media is encrypted > using keys provided by security descriptions. Or, even better, data channels can just not be used in this case. Matthew Kaufman From matthew@matthew.at Thu Apr 25 21:16:06 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A611821E8041 for ; Thu, 25 Apr 2013 21:16:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.43 X-Spam-Level: X-Spam-Status: No, score=-1.43 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_AT=0.424, HOST_EQ_AT=0.745] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id DMZcKVJyac1M for ; Thu, 25 Apr 2013 21:16:03 -0700 (PDT) Received: from where.matthew.at (where.matthew.at [198.202.199.1]) by ietfa.amsl.com (Postfix) with ESMTP id E2D6221E8045 for ; Thu, 25 Apr 2013 21:16:00 -0700 (PDT) Received: from [10.10.155.2] (unknown [10.10.155.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by where.matthew.at (Postfix) with ESMTP id A286E1480C3 for ; Thu, 25 Apr 2013 21:16:00 -0700 (PDT) Message-ID: <5179FF82.7080908@matthew.at> Date: Thu, 25 Apr 2013 21:16:02 -0700 From: Matthew Kaufman User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> <91B4F744-2201-4361-A8D8-7D36F47B865C@cisco.com> In-Reply-To: <91B4F744-2201-4361-A8D8-7D36F47B865C@cisco.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 04:16:06 -0000 On 4/25/2013 3:14 PM, Dan Wing wrote: > On Apr 25, 2013, at 9:39 AM, Alan Johnston wrote: > > >> 2. We need it or something like it for API reasons. There are cases where the JavaScript needs to tell the browser what SRTP key to use. > DTLS-SRTP with EKT can also perform that function, and does it without disclosing the SRTP key to all the SIP proxies and all the web servers on the signaling path. 1. Are you suggesting that we also mandate EKT? 2. Do you believe that an evil web server would do something other than negotiate DTLS-SRTP with the mixer it is in cahoots with? The only advantage I can see is that if we mandate cipher suites that have PFS, then you get PFS... which helps until the evil web site's mixer records all the cleartext and saves it indefinitely as well. But it does help in the case where the partially-evil website only tells people the keys it logs. And then not, when the partially-evil website's mixer or gateway uses EKT and then only tells people the keys it issued. So my conclusions (and correct me if I'm wrong): DTLS-SRTP w/EKT is exactly as secure as SDES sent over HTTPS... it is just a different encrypted channel over which the key is set. DTLS-SRTP w/EKT requires a more complex media gateway relationship for interworking (as it needs to be in-path for the keying on that side, despite the use of SDES on the other side). DTLS-SRTP w/EKT for interworking exposes the key via SDES on the other side of the interworking relationship anyway, so even though there isn't SDES to the browser there's SDES on the other (likely SIP) side. And DTLS-SRTP without EKT fails for the cases where the key needs to be set for interworking. And finally, to get the browser-to-browser security guarantees you want you need to be A) sure that you're really talking browser to browser and not via something else in path (like a mixer) and B) would really prefer that there be no way that the in-path device be able to force a key (thus you'd want to NOT allow EKT in the browser-to-browser case, even though there's no way for a browser to know what it is talking to) > >> Since JSEP uses SDP for this API surface, SDES works for this. Obviously it is a bad idea to send this key over unsecured channels, but this is separate from this API issue. >> >> And just to be clear, browser to browser should use DTLS-SRTP, and only thus mode should be considered "secure" using whatever user interface a browser chooses. > But is there a secure mechanism to differentiate browser-to-browser calls from browser-to-non-browser calls, so we don't have to worry over SDES downgrade attacks? This is provably impossible. > And for the use-cases where JavaScript has to set the key, those will often be browser-to-browser calls, meaning that we will have to support browser-to-browser SDES, contrary to your desire that browser-to-browser use DTLS-SRTP? Yes, of course. > DTLS-SRTP with EKT permits the application to set the SRTP key, and more securely than SDES. See above. I don't believe that it is "more securely". The path is different. Whether that path is more secure or equivalently secure is debatable. Matthew Kaufman From matthew@matthew.at Thu Apr 25 21:21:05 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0DFE121E8048 for ; Thu, 25 Apr 2013 21:21:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.43 X-Spam-Level: X-Spam-Status: No, score=-1.43 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_AT=0.424, HOST_EQ_AT=0.745] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MscOmkFxTxK3 for ; Thu, 25 Apr 2013 21:21:04 -0700 (PDT) Received: from where.matthew.at (where.matthew.at [198.202.199.1]) by ietfa.amsl.com (Postfix) with ESMTP id 80D6821E8045 for ; Thu, 25 Apr 2013 21:21:00 -0700 (PDT) Received: from [10.10.155.2] (unknown [10.10.155.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by where.matthew.at (Postfix) with ESMTP id 70051230005 for ; Thu, 25 Apr 2013 21:21:00 -0700 (PDT) Message-ID: <517A00AE.2090804@matthew.at> Date: Thu, 25 Apr 2013 21:21:02 -0700 From: Matthew Kaufman User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 04:21:05 -0000 On 4/25/2013 4:19 PM, Eric Rescorla wrote: > > It's certainly true that the site has access to the media with DTLS if you > don't use identity assertions/isolated streams. However, what it doesn't > have is *invisible* access. I.e., it must do something that is user > visible, > which allows for the detection of cheating by the site. By contrast, > if SDES is used > then the site can simply passively monitor all your traffic, or at least > any that goes through its network and you can't detect it. > That really depends on what you mean by "user visible" doesn't it? If you mean "the user is watching to see that all their packets go to what they know is the verified IP address of their buddy" then sure. But if you mean "the user is looking at their web browser user interface" or even "the user was worried mid-call so checked to see where the packets were going" then I think not, as all that needs to happen is for the call to be set up with a middlebox in the path that the site claims is necessary for the call to work (meets the UI test), keys set with EKT, and then a little ICE renegotiation and the middlebox goes away from the path (meets even the second test). Matthew Kaufman From matthew@matthew.at Thu Apr 25 21:27:33 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 58C6721E803D for ; Thu, 25 Apr 2013 21:27:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.43 X-Spam-Level: X-Spam-Status: No, score=-1.43 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_AT=0.424, HOST_EQ_AT=0.745] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wKfYI85dxD08 for ; Thu, 25 Apr 2013 21:27:32 -0700 (PDT) Received: from where.matthew.at (where.matthew.at [198.202.199.1]) by ietfa.amsl.com (Postfix) with ESMTP id C5F2121E803A for ; Thu, 25 Apr 2013 21:27:32 -0700 (PDT) Received: from [10.10.155.2] (unknown [10.10.155.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by where.matthew.at (Postfix) with ESMTP id AD767148070 for ; Thu, 25 Apr 2013 21:27:32 -0700 (PDT) Message-ID: <517A0237.9030008@matthew.at> Date: Thu, 25 Apr 2013 21:27:35 -0700 From: Matthew Kaufman User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <5179BEEF.4000600@jesup.org> In-Reply-To: <5179BEEF.4000600@jesup.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 04:27:33 -0000 On 4/25/2013 4:40 PM, Randell Jesup wrote: > On 4/25/2013 4:27 PM, Matthew Kaufman (SKYPE) wrote: >> I agree. The ability to set the cipher suite and keys from JavaScript >> is critical for certain applications. SDES is the best we'll get with >> SDP as the API. DTLS-SRTP-only would be unacceptably limiting. > > So, the problems with SDES (discussed to a fare-the-well every 3 > months for the last 1.75 years or more, so there's nothing really new > here): > > It exposes security keys directly to the application (or takes them > from there). Basically, you're back in "all your media is totally in > trust to the application and website". The keys aren't even end-2-end > encrypted or even authenticated. And even if you expose SDES > bid-downs to the user, they don't know what they mean or how to > process this information. This is true anyway, because even if we only allow DTLS-SRTP, we will allow cases like (as an example) Google Hangouts... which will no doubt be implemented by having the box in the middle be who you're calling and doing the DTLS exchange with. And then yes, you're trusting the application and website and its mixer with your media. > > SDES basically means to me "secure against random WiFi sniffers at the > coffeeshop", and little more than that. I realize carriers and others > like SDES because they make certain uses and obligations easy for them > to meet, and interop with legacy devices and systems easier (though > many such legacy interop systems will perforce need gateways anyways, > and those gateways can convert from DTLS-SRTP to SDES. They can, but gateways that do the ICE connectivity check only were already an annoyance that makes interop harder than we'd like. Now we're going to force those gateways to also do DTLS-SRTP and EKT? Is the goal here to put up as many roadblocks as possible to RTCWEB developers who want to access networks outside of the browser-to-browser case? > > Yes, some gateway scenarios might be cheaper/easier with SDES, but I > see the primary use-cases for WebRTC to be browser-to-browser, not > browser-legacy. Just because the charter was mistakenly written that way doesn't mean it is true. Think of all the C2B use cases, where the agents in the call center probably won't be on browsers... and even if they are, those browsers will be behind systems that do things like supervisor monitoring and barge-in, audit recording, etc. > Certainly some large organizations are built around the VoIP/net to > legacy equipment/PSTN/PBX use-case, and certainly they would find SDES > easier. And many upstarts in the space are leveraging the large legacy VoIP and PSTN networks to give developers a reason to put their RTCWEB-based services into their browser experiences, too. > > But I think we need to weigh that against the longer term, and the > interests of the users (not the providers) -- the users aren't > generally at this table; the IETF is full of people who almost by > definition work for the companies that provide data and services. (Not > everyone, but most.) > > I realize there are some (many) who have > business/organizational/political reasons to avoid end-2-end > encryption. However, per IETF norms (RFC 2084) we should not be > letting that decide this issue. > > > It's tough to find a way to allow SDES in the "connect to a gateway > that will decrypt anyways" case, while also avoid bid-down attacks on > browser-browser communication. (and EKT has some of the same key > control issues) > > We can say "we enforce DTLS-SRTP only for secure, authenticated" calls > like ekr presented (with media tainting, etc) - but that mode isn't > the default and really can't be/won't be for many users and > applications, making it at best an obscure option for most people. An > app (or browser chrome) could put a "renegotiate/re-encrypt NOW with > only DTLS-SRTP" button up, but I doubt most apps would bother, and it > might be a struggle to get all browsers to include such an option I > suspect. And even that might/would be hard to convey to users. But > maybe that's the best we can do. If so, it's a sad day we can't > collectively figure out something better. > We could do much better security-wise... If we really wanted nobody to use this stuff. Matthew Kaufman From matthew@matthew.at Thu Apr 25 21:31:34 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3442221F9761 for ; Thu, 25 Apr 2013 21:31:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.43 X-Spam-Level: X-Spam-Status: No, score=-1.43 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_AT=0.424, HOST_EQ_AT=0.745] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6KKTVCGjG1Qk for ; Thu, 25 Apr 2013 21:31:33 -0700 (PDT) Received: from where.matthew.at (where.matthew.at [198.202.199.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8ED7A21F96FC for ; Thu, 25 Apr 2013 21:31:33 -0700 (PDT) Received: from [10.10.155.2] (unknown [10.10.155.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by where.matthew.at (Postfix) with ESMTP id 6E2A9148028 for ; Thu, 25 Apr 2013 21:31:33 -0700 (PDT) Message-ID: <517A0327.7030307@matthew.at> Date: Thu, 25 Apr 2013 21:31:35 -0700 From: Matthew Kaufman User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 04:31:34 -0000 On 4/25/2013 5:28 PM, Dan Wing wrote: > On Apr 25, 2013, at 4:01 PM, Martin Thomson wrote: > >> The case for SDES has thus far been summarized as (borrowing Adam's words): >> >> (1) Those required for interop with legacy devices, and >> (2) those which we are prohibited by RFC 2804 from considering. >> >> Reason (1) is a fairly big deal. There are other reasons: >> >> Performance - A DTLS handshake takes a fair bit of CPU time, >> especially on the passive (server) peer, and two round trips. The CPU >> cost might not be that big of a deal (SBC vendors may disagree), but >> round trips hurt. > Yes. But major web sites seem to accept the performance penalty of the TLS handshake, both CPU hit and round trips. The people who build the boxes that were going to just have to do the ICE front-end for legacy systems would probably tell you that the cost of the TLS handshake is a lot higher for them than it is for web servers. I'm not one of them, but I'm sure we have one on the list. >> Conferencing Scenarios - Ensuring that streams can be mixed, >> translated and still decoded for a multi-leg conference is just easier >> with security descriptions. >> >> It's true that conferencing scenarios can be addressed by EKT, but EKT >> has similar 2804 properties as security descriptions. It would not be >> permissible to use EKT for a peer identity bound session because it >> makes the media accessible to signaling intermediaries (read: the web >> site). > To the contrary -- EKT is protected by the DTLS-SRTP key, which is not known to the web site (or SIP proxies). Unless of course the web site has anything to do with the box you've negotiated DTLS with... in which case not only does the web site know the EKT key, it also knows what DTLS key was negotiated to protect it! >> As long as you are in that state, EKT doesn't really provide that >> much. Bid-down protection seems lame when the site has access to the >> keys. > Yes, it is lame if the site has access to the keys. That is why I don't want Security Descriptions used with RTCWEB. So you're going to argue against EKT, and require browsers to somehow prove that they are browsers and prevent browsers from talking to anything that isn't. I believe this would A) break a lot of the use cases and B) be technically infeasible. >> Practical Matters of Security - You aren't necessarily more secure >> because you are using DTLS-SRTP. The complete security story requires >> not just DTLS-SRTP, but also that both peers use identity assertions. >> Otherwise its security properties are basically the same as security >> descriptions. > Agreed. And DTLS-SRTP provides the foundation to build such a system. Security Descriptions does not provide a foundation to build such a system. Yes, and we are providing DTLS-SRTP. So how does SDES not providing such a foundation matter in your argument? Matthew Kaufman From matthew@matthew.at Thu Apr 25 21:32:54 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C3DAF21E803D for ; Thu, 25 Apr 2013 21:32:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.43 X-Spam-Level: X-Spam-Status: No, score=-1.43 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HELO_EQ_AT=0.424, HOST_EQ_AT=0.745] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LpjnClErMBlN for ; Thu, 25 Apr 2013 21:32:54 -0700 (PDT) Received: from where.matthew.at (where.matthew.at [198.202.199.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3A67621F9761 for ; Thu, 25 Apr 2013 21:32:54 -0700 (PDT) Received: from [10.10.155.2] (unknown [10.10.155.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by where.matthew.at (Postfix) with ESMTP id ED1A0148028 for ; Thu, 25 Apr 2013 21:32:51 -0700 (PDT) Message-ID: <517A0376.3050904@matthew.at> Date: Thu, 25 Apr 2013 21:32:54 -0700 From: Matthew Kaufman User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <0C0C05DA-C283-40CF-A7CA-BF5F27A21720@cisco.com> In-Reply-To: <0C0C05DA-C283-40CF-A7CA-BF5F27A21720@cisco.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 04:32:55 -0000 On 4/25/2013 5:36 PM, Dan Wing wrote: > > Or storing fingerprints into an addressbook (similar to HTTPS key pinning), cooperatively comparing fingerprints (similar to http://perspectives-project.org), and the rest of the state of the art and emerging state of the art for certificate validation. Yes. And so it'll learn that everyone calls everyone else via Google's server. How does that help with people's media staying secure from interception exactly? Matthew Kaufman From harald@alvestrand.no Thu Apr 25 22:19:31 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EF63421F92A5 for ; Thu, 25 Apr 2013 22:19:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.599 X-Spam-Level: X-Spam-Status: No, score=-110.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IAcu6yoDJIPS for ; Thu, 25 Apr 2013 22:19:31 -0700 (PDT) Received: from eikenes.alvestrand.no (eikenes.alvestrand.no [158.38.152.233]) by ietfa.amsl.com (Postfix) with ESMTP id 3DC9D21F921B for ; Thu, 25 Apr 2013 22:19:31 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by eikenes.alvestrand.no (Postfix) with ESMTP id E932439E11A; Fri, 26 Apr 2013 07:19:29 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at eikenes.alvestrand.no Received: from eikenes.alvestrand.no ([127.0.0.1]) by localhost (eikenes.alvestrand.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FBLCLGzVNQqM; Fri, 26 Apr 2013 07:19:29 +0200 (CEST) Received: from [10.10.4.232] (unknown [61.34.168.5]) by eikenes.alvestrand.no (Postfix) with ESMTPSA id 72D8839E0E1; Fri, 26 Apr 2013 07:19:28 +0200 (CEST) Message-ID: <517A0E5C.6010505@alvestrand.no> Date: Fri, 26 Apr 2013 07:19:24 +0200 From: Harald Alvestrand User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 MIME-Version: 1.0 To: Cullen Jennings References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> In-Reply-To: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 05:19:32 -0000 On 04/25/2013 05:57 PM, Cullen Jennings wrote: > The working groups committed some time ago to have a further discussion on whether SDP Security Descriptions (RFC 4568 aka SDES) would be usable as a keying method for WebRTC. As we prepare for that discussion, we'd like to have expressions of interest or support for that approach which indicate the general outlines of support proposed. If you wish to make such an expression of support, please send it to the chairs or the list. Sorry, I got lost in the levels of support. Are you asking for indications of support for the idea of supporting SDES (in which case you should also be asking for indications of support for the idea of NOT supporting SDES), or are you asking for indications of support for the idea of having a discussion about supporting SDES? Harald From harald@alvestrand.no Thu Apr 25 22:25:16 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BF8CE21F978C for ; Thu, 25 Apr 2013 22:25:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.599 X-Spam-Level: X-Spam-Status: No, score=-110.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AjQzwet1D+sb for ; Thu, 25 Apr 2013 22:25:16 -0700 (PDT) Received: from eikenes.alvestrand.no (eikenes.alvestrand.no [158.38.152.233]) by ietfa.amsl.com (Postfix) with ESMTP id AD16921F9690 for ; Thu, 25 Apr 2013 22:25:15 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by eikenes.alvestrand.no (Postfix) with ESMTP id 5C6D739E11A for ; Fri, 26 Apr 2013 07:25:14 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at eikenes.alvestrand.no Received: from eikenes.alvestrand.no ([127.0.0.1]) by localhost (eikenes.alvestrand.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vS+s2kHXQl4K for ; Fri, 26 Apr 2013 07:25:12 +0200 (CEST) Received: from [10.10.4.232] (unknown [61.34.168.5]) by eikenes.alvestrand.no (Postfix) with ESMTPSA id A26EA39E0E1 for ; Fri, 26 Apr 2013 07:25:11 +0200 (CEST) Message-ID: <517A0FB3.6010007@alvestrand.no> Date: Fri, 26 Apr 2013 07:25:07 +0200 From: Harald Alvestrand User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <5179BEEF.4000600@jesup.org> <517A0237.9030008@matthew.at> In-Reply-To: <517A0237.9030008@matthew.at> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 05:25:16 -0000 On 04/26/2013 06:27 AM, Matthew Kaufman wrote: > On 4/25/2013 4:40 PM, Randell Jesup wrote: >> On 4/25/2013 4:27 PM, Matthew Kaufman (SKYPE) wrote: >>> I agree. The ability to set the cipher suite and keys from >>> JavaScript is critical for certain applications. SDES is the best >>> we'll get with SDP as the API. DTLS-SRTP-only would be unacceptably >>> limiting. >> >> So, the problems with SDES (discussed to a fare-the-well every 3 >> months for the last 1.75 years or more, so there's nothing really new >> here): >> >> It exposes security keys directly to the application (or takes them >> from there). Basically, you're back in "all your media is totally in >> trust to the application and website". The keys aren't even >> end-2-end encrypted or even authenticated. And even if you expose >> SDES bid-downs to the user, they don't know what they mean or how to >> process this information. > > This is true anyway, because even if we only allow DTLS-SRTP, we will > allow cases like (as an example) Google Hangouts... which will no > doubt be implemented by having the box in the middle be who you're > calling and doing the DTLS exchange with. And then yes, you're > trusting the application and website and its mixer with your media. Strictly speaking, you're trusting the mixer with your media. You trust the website to serve up the application, and you trust the application to choose the mixer. This offers up an easy attack for any website that has a mixer it coordinates with - but it's the mixer you trust with your media. It's nice to be precise. From harald@alvestrand.no Thu Apr 25 22:30:51 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 477B821F97D9 for ; Thu, 25 Apr 2013 22:30:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.599 X-Spam-Level: X-Spam-Status: No, score=-110.599 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rXDJbtkWXAuy for ; Thu, 25 Apr 2013 22:30:50 -0700 (PDT) Received: from eikenes.alvestrand.no (eikenes.alvestrand.no [158.38.152.233]) by ietfa.amsl.com (Postfix) with ESMTP id E260521F97AB for ; Thu, 25 Apr 2013 22:30:49 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by eikenes.alvestrand.no (Postfix) with ESMTP id C866239E11A for ; Fri, 26 Apr 2013 07:30:47 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at eikenes.alvestrand.no Received: from eikenes.alvestrand.no ([127.0.0.1]) by localhost (eikenes.alvestrand.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kXfXeABgbR5K for ; Fri, 26 Apr 2013 07:30:47 +0200 (CEST) Received: from [10.10.4.232] (unknown [61.34.168.5]) by eikenes.alvestrand.no (Postfix) with ESMTPSA id 54DE439E0E1 for ; Fri, 26 Apr 2013 07:30:45 +0200 (CEST) Message-ID: <517A1102.1010906@alvestrand.no> Date: Fri, 26 Apr 2013 07:30:42 +0200 From: Harald Alvestrand User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <5174C8D2.40504@matthew.at> <5177F7EE.1010909@matthew.at> In-Reply-To: Content-Type: multipart/alternative; boundary="------------060901080300070000080002" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 05:30:51 -0000 This is a multi-part message in MIME format. --------------060901080300070000080002 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit On 04/25/2013 07:28 AM, Matthew Kaufman (SKYPE) wrote: > > It is a much simpler question as there's only a couple of options > left... how about we throw it on the floor? That seems safest to me. > > I'd still love to hear why it is "needed" though. > The fact that Matthew doesn't want to accept the arguments for why it is needed doesn't seem relevant to me. I think people have said enough times that they see value in the label concept, and they want some way to carry it. The OPEN message is a simple way to fill that need (and also makes some other aspects of setup simpler than they would otherwise be). --------------060901080300070000080002 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
On 04/25/2013 07:28 AM, Matthew Kaufman (SKYPE) wrote:

It is a much simpler question as there’s only a couple of options left… how about we throw it on the floor? That seems safest to me.

 

I’d still love to hear why it is “needed” though.


The fact that Matthew doesn't want to accept the arguments for why it is needed doesn't seem relevant to me.

I think people have said enough times that they see value in the label concept, and they want some way to carry it. The OPEN message is a simple way to fill that need (and also makes some other aspects of setup simpler than they would otherwise be).



--------------060901080300070000080002-- From randell-ietf@jesup.org Thu Apr 25 22:53:59 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 60A6E21F9080 for ; Thu, 25 Apr 2013 22:53:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.166 X-Spam-Level: X-Spam-Status: No, score=-2.166 tagged_above=-999 required=5 tests=[AWL=0.433, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yH5c8po5W1kH for ; Thu, 25 Apr 2013 22:53:58 -0700 (PDT) Received: from r2-chicago.webserversystems.com (r2-chicago.webserversystems.com [173.236.101.58]) by ietfa.amsl.com (Postfix) with ESMTP id 0758B21F8F4A for ; Thu, 25 Apr 2013 22:53:57 -0700 (PDT) Received: from pool-98-111-140-34.phlapa.fios.verizon.net ([98.111.140.34]:4963 helo=[192.168.1.12]) by r2-chicago.webserversystems.com with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.80) (envelope-from ) id 1UVbbZ-00094X-3p for rtcweb@ietf.org; Fri, 26 Apr 2013 00:53:57 -0500 Message-ID: <517A167A.9090105@jesup.org> Date: Fri, 26 Apr 2013 01:54:02 -0400 From: Randell Jesup User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <5179BEEF.4000600@jesup.org> <517A0237.9030008@matthew.at> In-Reply-To: <517A0237.9030008@matthew.at> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - r2-chicago.webserversystems.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - jesup.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 05:53:59 -0000 On 4/26/2013 12:27 AM, Matthew Kaufman wrote: > On 4/25/2013 4:40 PM, Randell Jesup wrote: >> On 4/25/2013 4:27 PM, Matthew Kaufman (SKYPE) wrote: >>> I agree. The ability to set the cipher suite and keys from >>> JavaScript is critical for certain applications. SDES is the best >>> we'll get with SDP as the API. DTLS-SRTP-only would be unacceptably >>> limiting. >> >> So, the problems with SDES (discussed to a fare-the-well every 3 >> months for the last 1.75 years or more, so there's nothing really new >> here): >> >> It exposes security keys directly to the application (or takes them >> from there). Basically, you're back in "all your media is totally in >> trust to the application and website". The keys aren't even >> end-2-end encrypted or even authenticated. And even if you expose >> SDES bid-downs to the user, they don't know what they mean or how to >> process this information. > > This is true anyway, because even if we only allow DTLS-SRTP, we will > allow cases like (as an example) Google Hangouts... which will no > doubt be implemented by having the box in the middle be who you're > calling and doing the DTLS exchange with. And then yes, you're > trusting the application and website and its mixer with your media. No argument: if you're calling into a mixer, all bets are off (it's secure only until it gets the data to the server/mixer). And even person-to-person, without identity assertions it is MITM-able, though not completely undetectably - you can examine the IP addresses of the packet (and if you have identity assertions you have to check the identities, or have something to flag that there was a fingerprint/key change). > >> >> SDES basically means to me "secure against random WiFi sniffers at >> the coffeeshop", and little more than that. I realize carriers and >> others like SDES because they make certain uses and obligations easy >> for them to meet, and interop with legacy devices and systems easier >> (though many such legacy interop systems will perforce need gateways >> anyways, and those gateways can convert from DTLS-SRTP to SDES. > > They can, but gateways that do the ICE connectivity check only were > already an annoyance that makes interop harder than we'd like. Now > we're going to force those gateways to also do DTLS-SRTP and EKT? Is > the goal here to put up as many roadblocks as possible to RTCWEB > developers who want to access networks outside of the > browser-to-browser case? I agree it's inconvenient to have these requirements - I spent a bunch of brain cycles and some phone chats with Cullen trying to figure out a way to enable PSTN gateway calls to avoid needing to use ICE and avoid needing DTLS-SRTP, and failed. With DNSSec it's almost possible. > >> >> Yes, some gateway scenarios might be cheaper/easier with SDES, but I >> see the primary use-cases for WebRTC to be browser-to-browser, not >> browser-legacy. > > Just because the charter was mistakenly written that way doesn't mean > it is true. Think of all the C2B use cases, where the agents in the > call center probably won't be on browsers... and even if they are, > those browsers will be behind systems that do things like supervisor > monitoring and barge-in, audit recording, etc. I don't count that as legacy - or if it is, that's fine - the call can be confirmed secure to the company's gateway and the gateway can identify itself as the company. > >> Certainly some large organizations are built around the VoIP/net to >> legacy equipment/PSTN/PBX use-case, and certainly they would find >> SDES easier. > > And many upstarts in the space are leveraging the large legacy VoIP > and PSTN networks to give developers a reason to put their > RTCWEB-based services into their browser experiences, too. > >> >> But I think we need to weigh that against the longer term, and the >> interests of the users (not the providers) -- the users aren't >> generally at this table; the IETF is full of people who almost by >> definition work for the companies that provide data and services. >> (Not everyone, but most.) >> >> I realize there are some (many) who have >> business/organizational/political reasons to avoid end-2-end >> encryption. However, per IETF norms (RFC 2084) we should not be >> letting that decide this issue. >> >> >> It's tough to find a way to allow SDES in the "connect to a gateway >> that will decrypt anyways" case, while also avoid bid-down attacks on >> browser-browser communication. (and EKT has some of the same key >> control issues) >> >> We can say "we enforce DTLS-SRTP only for secure, authenticated" >> calls like ekr presented (with media tainting, etc) - but that mode >> isn't the default and really can't be/won't be for many users and >> applications, making it at best an obscure option for most people. An >> app (or browser chrome) could put a "renegotiate/re-encrypt NOW with >> only DTLS-SRTP" button up, but I doubt most apps would bother, and it >> might be a struggle to get all browsers to include such an option I >> suspect. And even that might/would be hard to convey to users. But >> maybe that's the best we can do. If so, it's a sad day we can't >> collectively figure out something better. >> > > We could do much better security-wise... If we really wanted nobody to > use this stuff. That's always the problem with strong security... It has to be unobtrusive-but-functional in the "normal" cases to get widely used. Green-field encryption can be fairly easily strong because of lack of needing to interop. -- Randell Jesup randell-ietf@jesup.org From ted.ietf@gmail.com Thu Apr 25 22:55:22 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3301821F9080 for ; Thu, 25 Apr 2013 22:55:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yQa5IVf0vQHe for ; Thu, 25 Apr 2013 22:55:20 -0700 (PDT) Received: from mail-ia0-x234.google.com (mail-ia0-x234.google.com [IPv6:2607:f8b0:4001:c02::234]) by ietfa.amsl.com (Postfix) with ESMTP id AEB4421F965E for ; Thu, 25 Apr 2013 22:55:20 -0700 (PDT) Received: by mail-ia0-f180.google.com with SMTP id t4so2437114iag.11 for ; Thu, 25 Apr 2013 22:55:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=LceFlVMk7UMXUz1Q40GSX1Ihm9uT25M4v9u0jrmvMTk=; b=jpjFdzKDwHOO77goTsA/OAHzoCeTCURgdjF0+1nPIc8j+WKIV0MMiqKkxDb8H7txhD M3575nw/GFGobQ5tMVw/gAVBfQ3Rozn71q/1tt4LuStXOVJ+ASEcJ+S81d4fp9FDJVsq 2IR28IR0buBgjvdkLrsTh62eX/y19NB0Dp8ROyo7UZB+lWFaZgTfVgjDlWddntcCccST sy+KVnuCGDeNVo9nh8NTbScbETrTdG1up7+59CLQuH6y/gUpVcQ6yxEziBfxLzUHCriD 3RuvS9jrfhHrQaKuNeOR9lnsSY2Eu8F6C1NOExTVbbEUJREfgrZDPx6LgLniMXy29yaI jYCA== MIME-Version: 1.0 X-Received: by 10.42.64.69 with SMTP id f5mr23390268ici.29.1366955720325; Thu, 25 Apr 2013 22:55:20 -0700 (PDT) Received: by 10.42.211.16 with HTTP; Thu, 25 Apr 2013 22:55:20 -0700 (PDT) In-Reply-To: <517A0237.9030008@matthew.at> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <5179BEEF.4000600@jesup.org> <517A0237.9030008@matthew.at> Date: Thu, 25 Apr 2013 22:55:20 -0700 Message-ID: From: Ted Hardie To: Matthew Kaufman Content-Type: multipart/alternative; boundary=90e6ba5bca8f224ad304db3d2e9f Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 05:55:22 -0000 --90e6ba5bca8f224ad304db3d2e9f Content-Type: text/plain; charset=ISO-8859-1 On Thu, Apr 25, 2013 at 9:27 PM, Matthew Kaufman wrote: > O > >> Yes, some gateway scenarios might be cheaper/easier with SDES, but I see >> the primary use-cases for WebRTC to be browser-to-browser, not >> browser-legacy. >> > > Just because the charter was mistakenly written that way doesn't mean it > is true. > I remind you that the actual title of the group is: "Real-Time Communication in WEB-browsers (rtcweb)". While you may disagree with the charter, please remember that it's not fundamentally a prediction about what the eventual balance of flows will be. It's a statement about where the balance of effort in the group should go. To me as an individual, it implies that we should not make trade-offs that optimize a non-browser use case at the expense of the browser use case except in pretty extraordinary circumstances. regards, Ted Hardie --90e6ba5bca8f224ad304db3d2e9f Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Thu, Apr 25, 2013 at 9:27 PM, Matthew Kaufman <matthew@matthew.at&= gt; wrote:
O
Yes, some gateway scenarios might be cheaper/easier with SDES, but I see th= e primary use-cases for WebRTC to be browser-to-browser, not browser-legacy= .

Just because the charter was mistakenly written that way doesn't mean i= t is true.

I remind you that the actual title of t= he group is:

"Real-Time Communication in WEB-browsers (rtcweb)&= quot;.=A0 While you may disagree with the charter, please remember that it&= #39;s not fundamentally a prediction about what the eventual balance of flo= ws will be.=A0 It's a statement about where the balance of effort in th= e group should go.=A0=A0 To me as an individual, it implies that we should = not make trade-offs that optimize a non-browser use case at the expense of = the browser use case except in pretty extraordinary circumstances.

regards,

Ted Hardie
--90e6ba5bca8f224ad304db3d2e9f-- From ekr@rtfm.com Thu Apr 25 23:09:12 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7D9CB21F97AF for ; Thu, 25 Apr 2013 23:09:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -96.525 X-Spam-Level: X-Spam-Status: No, score=-96.525 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FH_RELAY_NODNS=1.451, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_PBL=0.905, RCVD_IN_SORBS_DUL=0.877, RDNS_NONE=0.1, RELAY_IS_220=2.118, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id z-m7EQ1PGnjm for ; Thu, 25 Apr 2013 23:09:12 -0700 (PDT) Received: from mail-vb0-x229.google.com (mail-vb0-x229.google.com [IPv6:2607:f8b0:400c:c02::229]) by ietfa.amsl.com (Postfix) with ESMTP id BEE8821F8EF7 for ; Thu, 25 Apr 2013 23:09:11 -0700 (PDT) Received: by mail-vb0-f41.google.com with SMTP id f12so1332471vbg.28 for ; Thu, 25 Apr 2013 23:09:11 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:x-originating-ip:in-reply-to:references :from:date:message-id:subject:to:cc:content-type:x-gm-message-state; bh=nGpsngy0HHt3V+eB+3ivWPII5rllMJCrq1MNcD4wzKM=; b=AZpkZHD8oJyrabRWwN74th6lmU/Y5o32sYm3nseHfjxBCeOITEbKQFHfs3/6+8/5Xv 4kC2kjEshsgyS9ctQ3vP0z5LIm+PVBiRXzxDBEr+zXPteyVi/F/IplKzGgIUM1KzqGKd vnywZCLj2czNklq6Si4m2gejyyx6vZkgMrqYru/TyCKkCTrA5EdKwNA45nsUkcd6lEfW kSvF+TGEy6B5+KzIUukqxzNKVlQfIJsKlvszYskT549YHeFCUVmdJ5gp+HXys9edmKIP lzV9Iy1iN2k/m+j4NzS8GCnxfaNZsuY/raScgJcuolDh8SV+TBMNVkZrWZUvjGuL4vks 1+6g== X-Received: by 10.58.220.129 with SMTP id pw1mr28635153vec.32.1366956551116; Thu, 25 Apr 2013 23:09:11 -0700 (PDT) MIME-Version: 1.0 Received: by 10.58.161.71 with HTTP; Thu, 25 Apr 2013 23:08:31 -0700 (PDT) X-Originating-IP: [220.136.2.221] In-Reply-To: <517A00AE.2090804@matthew.at> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <517A00AE.2090804@matthew.at> From: Eric Rescorla Date: Thu, 25 Apr 2013 23:08:31 -0700 Message-ID: To: Matthew Kaufman Content-Type: multipart/alternative; boundary=047d7bd6a8cea75d1404db3d5f23 X-Gm-Message-State: ALoCoQkMw3huNIHCdQa2UYZMeoWHPZzTH6l8/D3OziGqxK/dBvginq+tP1Vt0PO+V0NV+pBrK0Xx Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 06:09:12 -0000 --047d7bd6a8cea75d1404db3d5f23 Content-Type: text/plain; charset=ISO-8859-1 On Thu, Apr 25, 2013 at 9:21 PM, Matthew Kaufman wrote: > On 4/25/2013 4:19 PM, Eric Rescorla wrote: > >> >> It's certainly true that the site has access to the media with DTLS if you >> don't use identity assertions/isolated streams. However, what it doesn't >> have is *invisible* access. I.e., it must do something that is user >> visible, >> which allows for the detection of cheating by the site. By contrast, if >> SDES is used >> then the site can simply passively monitor all your traffic, or at least >> any that goes through its network and you can't detect it. >> >> > That really depends on what you mean by "user visible" doesn't it? If you > mean "the user is watching to see that all their packets go to what they > know is the verified IP address of their buddy" then sure. But if you mean > "the user is looking at their web browser user interface" or even "the user > was worried mid-call so checked to see where the packets were going" then I > think not, as all that needs to happen is for the call to be set up with a > middlebox in the path that the site claims is necessary for the call to > work (meets the UI test), keys set with EKT, and then a little ICE > renegotiation and the middlebox goes away from the path (meets even the > second test). What I mean is that you can use fingerprint checks (admittedly inconvenient) to detect active attacks. Obviously, current browser UIs don't support that, but I expect them to eventually. -Ekr --047d7bd6a8cea75d1404db3d5f23 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

On Thu, Apr 25, 2013 at 9:21 PM, Matthew= Kaufman <matthew@matthew.at> wrote:
On 4/25/2013 4:19 PM, Eric Rescorla wrote:

It's certainly true that the site has access to the media with DTLS if = you
don't use identity assertions/isolated streams. However, what it doesn&= #39;t
have is *invisible* access. I.e., it must do something that is user visible= ,
which allows for the detection of cheating by the site. By contrast, if SDE= S is used
then the site can simply passively monitor all your traffic, or at least any that goes through its network and you can't detect it.


That really depends on what you mean by "user visible" doesn'= t it? If you mean "the user is watching to see that all their packets = go to what they know is the verified IP address of their buddy" then s= ure. But if you mean "the user is looking at their web browser user in= terface" or even "the user was worried mid-call so checked to see= where the packets were going" then I think not, as all that needs to = happen is for the call to be set up with a middlebox in the path that the s= ite claims is necessary for the call to work (meets the UI test), keys set = with EKT, and then a little ICE renegotiation and the middlebox goes away f= rom the path (meets even the second test).

What I mean is that you can use fingerprint checks (adm= ittedly inconvenient) to
detect active attacks. Obviously, curren= t browser UIs don't support that, but
I expect them to eventu= ally.

-Ekr

--047d7bd6a8cea75d1404db3d5f23-- From andrew.hutton@siemens-enterprise.com Fri Apr 26 00:55:09 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0AB0E21F97BB for ; Fri, 26 Apr 2013 00:55:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uLjHvvBDSgWV for ; Fri, 26 Apr 2013 00:55:07 -0700 (PDT) Received: from senmx12-mx.siemens-enterprise.com (senmx12-mx.siemens-enterprise.com [62.134.46.10]) by ietfa.amsl.com (Postfix) with ESMTP id 8938F21F979F for ; Fri, 26 Apr 2013 00:55:07 -0700 (PDT) Received: from MCHP01HTC.global-ad.net (unknown [172.29.42.234]) by senmx12-mx.siemens-enterprise.com (Server) with ESMTP id AD1E623F053E for ; Fri, 26 Apr 2013 09:55:06 +0200 (CEST) Received: from MCHP04MSX.global-ad.net ([169.254.1.169]) by MCHP01HTC.global-ad.net ([172.29.42.234]) with mapi id 14.02.0328.009; Fri, 26 Apr 2013 09:55:06 +0200 From: "Hutton, Andrew" To: "rtcweb@ietf.org" Thread-Topic: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb Thread-Index: AQHOQc2b7d5qJhp9MEOHW2URGh3SU5jnpCmAgAACAYD//8nZ4IAAsoqg Date: Fri, 26 Apr 2013 07:55:05 +0000 Message-ID: <9F33F40F6F2CD847824537F3C4E37DDF0E6C04AF@MCHP04MSX.global-ad.net> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> In-Reply-To: <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [172.29.42.225] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 07:55:09 -0000 Also agree that we should support SDES in additional to DTLS-SRTP. Regards Andy > -----Original Message----- > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > Behalf Of Ejzak, Richard P (Richard) > Sent: 25 April 2013 22:55 > To: rtcweb@ietf.org > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb >=20 > I also agree that we should support SDES in addition to DTLS-SRTP. >=20 > This raises a further question about SCTP/DTLS for DataChannels. It > seems that if we support SDES-SRTP, don't we also need to provide an > SDES keying mechanism for DataChannels? Ekr: What is needed to realize > this? >=20 > Richard Ejzak >=20 > > -----Original Message----- > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > Behalf Of Matthew Kaufman (SKYPE) > > Sent: Thursday, April 25, 2013 3:28 PM > > To: Bogineni, Kalyani; 'Cullen Jennings'; rtcweb@ietf.org > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > I agree. The ability to set the cipher suite and keys from JavaScript > > is critical for certain applications. SDES is the best we'll get with > > SDP as the API. DTLS-SRTP-only would be unacceptably limiting. > > > > Matthew Kaufman > > > > > -----Original Message----- > > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > > Behalf Of Bogineni, Kalyani > > > Sent: Thursday, April 25, 2013 1:21 PM > > > To: 'Cullen Jennings'; rtcweb@ietf.org > > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and > RTCWeb > > > > > > We would like to support the use of SDES as a keying method for > > WebRTC. > > > > > > Kalyani Bogineni > > > Verizon > > > > > > -----Original Message----- > > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > > Behalf Of Cullen Jennings > > > Sent: Thursday, April 25, 2013 11:57 AM > > > To: rtcweb@ietf.org > > > Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > > > > > > The working groups committed some time ago to have a further > > > discussion on whether SDP Security Descriptions (RFC 4568 aka SDES) > > > would be usable as a keying method for WebRTC. As we prepare for > > that > > > discussion, we'd like to have expressions of interest or support > for > > > that approach which indicate the general outlines of support > > proposed. > > > If you wish to make such an expression of support, please send it > to > > the chairs or the list. > > > > > > Cullen, Magnus, & Ted > > > > > > > > > _______________________________________________ > > > rtcweb mailing list > > > rtcweb@ietf.org > > > https://www.ietf.org/mailman/listinfo/rtcweb > > > _______________________________________________ > > > rtcweb mailing list > > > rtcweb@ietf.org > > > https://www.ietf.org/mailman/listinfo/rtcweb > > > > _______________________________________________ > > rtcweb mailing list > > rtcweb@ietf.org > > https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From xavier.marjou@gmail.com Fri Apr 26 01:49:46 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9242921F982D for ; Fri, 26 Apr 2013 01:49:46 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.977 X-Spam-Level: X-Spam-Status: No, score=-1.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id h+JohYToKHdw for ; Fri, 26 Apr 2013 01:49:45 -0700 (PDT) Received: from mail-la0-x22a.google.com (mail-la0-x22a.google.com [IPv6:2a00:1450:4010:c03::22a]) by ietfa.amsl.com (Postfix) with ESMTP id 1CB4721F981C for ; Fri, 26 Apr 2013 01:49:44 -0700 (PDT) Received: by mail-la0-f42.google.com with SMTP id fn20so3401149lab.1 for ; Fri, 26 Apr 2013 01:49:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:content-type; bh=9T7gJG4mlyRGXg5qR49N7t8YIoPIWuZCP6Th9Hm+O4U=; b=PrmomHENxlysa/u2QbS3W59YUr4jRiJrQ5udpxnk+jT34o2LO+MPS0Yk7NJk+qTPb2 W5fdxh7/S6TCbZzpFecvAFFY1aF+hzBJkehVFaUyUq0PanWDcfJlDZu+rJl/4JKAEg4d B9PFwoKpb7c7iewBm+2iSyWTaeVyXIXyFEKP8aE/7Bpl9qPVTyryKf4tGWgcm+O0XUX8 xwk/Qt/0ycNiLbVk+NhBMO+XFiDoaJUmJBRsYKVOnySn8jV/xvUsCpNsRftf8m3+gICB w7/8mBLP9PtGGjxQpKtDxXLft5Y1y7YyiSepPY/l68iuAJl5RwBjdLNmhMRHcaDBagKy XJSw== MIME-Version: 1.0 X-Received: by 10.112.155.67 with SMTP id vu3mr15093758lbb.109.1366966183836; Fri, 26 Apr 2013 01:49:43 -0700 (PDT) Sender: xavier.marjou@gmail.com Received: by 10.114.177.212 with HTTP; Fri, 26 Apr 2013 01:49:43 -0700 (PDT) In-Reply-To: <9F33F40F6F2CD847824537F3C4E37DDF0E6C04AF@MCHP04MSX.global-ad.net> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> <9F33F40F6F2CD847824537F3C4E37DDF0E6C04AF@MCHP04MSX.global-ad.net> Date: Fri, 26 Apr 2013 10:49:43 +0200 X-Google-Sender-Auth: V_10gmzlJFl5l_pyYoHQE6oEJpM Message-ID: From: Xavier Marjou To: "rtcweb@ietf.org" Content-Type: multipart/alternative; boundary=089e0118306ccec48304db3f9d65 Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 08:49:46 -0000 --089e0118306ccec48304db3f9d65 Content-Type: text/plain; charset=ISO-8859-1 +1 for supporting SDES as a keying method for WebRTC Cheers, Xavier On Fri, Apr 26, 2013 at 9:55 AM, Hutton, Andrew < andrew.hutton@siemens-enterprise.com> wrote: > Also agree that we should support SDES in additional to DTLS-SRTP. > > Regards > Andy > > > -----Original Message----- > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > Behalf Of Ejzak, Richard P (Richard) > > Sent: 25 April 2013 22:55 > > To: rtcweb@ietf.org > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > I also agree that we should support SDES in addition to DTLS-SRTP. > > > > This raises a further question about SCTP/DTLS for DataChannels. It > > seems that if we support SDES-SRTP, don't we also need to provide an > > SDES keying mechanism for DataChannels? Ekr: What is needed to realize > > this? > > > > Richard Ejzak > > > > > -----Original Message----- > > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > > Behalf Of Matthew Kaufman (SKYPE) > > > Sent: Thursday, April 25, 2013 3:28 PM > > > To: Bogineni, Kalyani; 'Cullen Jennings'; rtcweb@ietf.org > > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > > > I agree. The ability to set the cipher suite and keys from JavaScript > > > is critical for certain applications. SDES is the best we'll get with > > > SDP as the API. DTLS-SRTP-only would be unacceptably limiting. > > > > > > Matthew Kaufman > > > > > > > -----Original Message----- > > > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > > > Behalf Of Bogineni, Kalyani > > > > Sent: Thursday, April 25, 2013 1:21 PM > > > > To: 'Cullen Jennings'; rtcweb@ietf.org > > > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and > > RTCWeb > > > > > > > > We would like to support the use of SDES as a keying method for > > > WebRTC. > > > > > > > > Kalyani Bogineni > > > > Verizon > > > > > > > > -----Original Message----- > > > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > > > Behalf Of Cullen Jennings > > > > Sent: Thursday, April 25, 2013 11:57 AM > > > > To: rtcweb@ietf.org > > > > Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > > > > > > > > > The working groups committed some time ago to have a further > > > > discussion on whether SDP Security Descriptions (RFC 4568 aka SDES) > > > > would be usable as a keying method for WebRTC. As we prepare for > > > that > > > > discussion, we'd like to have expressions of interest or support > > for > > > > that approach which indicate the general outlines of support > > > proposed. > > > > If you wish to make such an expression of support, please send it > > to > > > the chairs or the list. > > > > > > > > Cullen, Magnus, & Ted > > > > > > > > > > > > _______________________________________________ > > > > rtcweb mailing list > > > > rtcweb@ietf.org > > > > https://www.ietf.org/mailman/listinfo/rtcweb > > > > _______________________________________________ > > > > rtcweb mailing list > > > > rtcweb@ietf.org > > > > https://www.ietf.org/mailman/listinfo/rtcweb > > > > > > _______________________________________________ > > > rtcweb mailing list > > > rtcweb@ietf.org > > > https://www.ietf.org/mailman/listinfo/rtcweb > > _______________________________________________ > > rtcweb mailing list > > rtcweb@ietf.org > > https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > --089e0118306ccec48304db3f9d65 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

+1 for supporting SDES as a=A0keying method for WebRTC

Cheers,

Xavier



On Fri, Apr 26, 2013 at 9:55 AM, Hut= ton, Andrew <andrew.hutton@siemens-enterprise.com&g= t; wrote:
Also agree that we should support SDES in ad= ditional to DTLS-SRTP.

Regards
Andy

> -----Original Message-----
> From: rtcweb-bounces@ietf.o= rg [mailto:rtcweb-bounces@ie= tf.org] On
> Behalf Of Ejzak, Richard= P (Richard)
> Sent: 25 April 2013 22:55
> To: rtcweb@ietf.org
> Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb<= br> >
> I also agree that we should support SDES in addition to DTLS-SRTP.
>
> This raises a further question about SCTP/DTLS for DataChannels. =A0It=
> seems that if we support SDES-SRTP, don't we also need to provide = an
> SDES keying mechanism for DataChannels? =A0Ekr: What is needed to real= ize
> this?
>
> Richard Ejzak
>
> > -----Original Message-----
> > From: rtcweb-bounces@i= etf.org [mailto:rtcweb-bounc= es@ietf.org] On
> > Behalf Of Matthew Kaufman (SKYPE)
> > Sent: Thursday, April 25, 2013 3:28 PM
> > To: Bogineni, Kalyani; 'Cullen Jennings'; rtcweb@ietf.org
> > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RT= CWeb
> >
> > I agree. The ability to set the cipher suite and keys from JavaSc= ript
> > is critical for certain applications. SDES is the best we'll = get with
> > SDP as the API. DTLS-SRTP-only would be unacceptably limiting. > >
> > Matthew Kaufman
> >
> > > -----Original Message-----
> > > From: rtcweb-boun= ces@ietf.org [mailto:rtcweb-= bounces@ietf.org] On
> > > Behalf Of Bogineni, Kalyani
> > > Sent: Thursday, April 25, 2013 1:21 PM
> > > To: 'Cullen Jennings'; rtcweb@ietf.org
> > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) a= nd
> RTCWeb
> > >
> > > We would like to support the use of SDES as a keying method = for
> > WebRTC.
> > >
> > > Kalyani Bogineni
> > > Verizon
> > >
> > > -----Original Message-----
> > > From: rtcweb-boun= ces@ietf.org [mailto:rtcweb-= bounces@ietf.org] On
> > > Behalf Of Cullen Jennings
> > > Sent: Thursday, April 25, 2013 11:57 AM
> > > To: rtcweb@ietf.org > > > Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and R= TCWeb
> > >
> > >
> > > The working groups committed some time ago to have a further=
> > > discussion on whether SDP Security Descriptions (RFC 4568 ak= a SDES)
> > > would be usable as a keying method for WebRTC. =A0As we prep= are for
> > that
> > > discussion, we'd like to have expressions of interest or= support
> for
> > > that approach which indicate the general outlines of support=
> > proposed.
> > > If you wish to make such an expression of support, please se= nd it
> to
> > the chairs or the list.
> > >
> > > Cullen, Magnus, & Ted <The Chairs>
> > >
> > >
> > > _______________________________________________
> > > rtcweb mailing list
> > > rtcweb@ietf.org
> > > https://www.ietf.org/mailman/listinfo/rtcweb
> > > _______________________________________________
> > > rtcweb mailing list
> > > rtcweb@ietf.org
> > > https://www.ietf.org/mailman/listinfo/rtcweb
> >
> > _______________________________________________
> > rtcweb mailing list
> > rtcweb@ietf.org
> > https://www.ietf.org/mailman/listinfo/rtcweb
> _______________________________________________
> rtcweb mailing list
> rtcweb@ietf.org
> https://www.ietf.org/mailman/listinfo/rtcweb
_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
= https://www.ietf.org/mailman/listinfo/rtcweb

--089e0118306ccec48304db3f9d65-- From tim@phonefromhere.com Fri Apr 26 04:11:20 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6D5BC21F980C for ; Fri, 26 Apr 2013 04:11:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UxoQOGSBvqjb for ; Fri, 26 Apr 2013 04:11:14 -0700 (PDT) Received: from smtp003.apm-internet.net (smtp003.apm-internet.net [85.119.248.52]) by ietfa.amsl.com (Postfix) with ESMTP id 83BA121F97F7 for ; Fri, 26 Apr 2013 04:11:12 -0700 (PDT) Received: (qmail 14464 invoked from network); 26 Apr 2013 11:11:11 -0000 X-AV-Scan: clean Received: from unknown (HELO zimbra003.verygoodemail.com) (85.119.248.218) by smtp003.apm-internet.net with SMTP; 26 Apr 2013 11:11:11 -0000 Received: from zimbra003.verygoodemail.com (localhost [127.0.0.1]) by zimbra003.verygoodemail.com (Postfix) with ESMTP id 475BE18A03A2; Fri, 26 Apr 2013 12:11:11 +0100 (BST) Received: from [192.67.4.33] (unknown [192.67.4.33]) by zimbra003.verygoodemail.com (Postfix) with ESMTPSA id 2A53618A02C7; Fri, 26 Apr 2013 12:11:11 +0100 (BST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=us-ascii From: Tim Panton In-Reply-To: Date: Fri, 26 Apr 2013 12:11:11 +0100 Content-Transfer-Encoding: quoted-printable Message-Id: References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> To: Martin Thomson X-Mailer: Apple Mail (2.1283) Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 11:11:20 -0000 On 26 Apr 2013, at 00:01, Martin Thomson wrote: > The case for SDES has thus far been summarized as (borrowing Adam's = words): >=20 > (1) Those required for interop with legacy devices, and > (2) those which we are prohibited by RFC 2804 from considering. >=20 > Reason (1) is a fairly big deal. There are other reasons: I don't buy the interop argument. There are (as we have all now discovered) no legacy devices that do SRTP = (SDES only) and Ice/STUN/rtcp-mux/bundle as required to consume the UDP that chrome (for example) generates. We = will _always_ need a media gateway in front of any current legacy devices to de-ice/de-mux/ etc the media streams from = webRTC. (Note: I refuse to take into account the oxymoronic 'future legacy' = devices that current legacy providers may build at some point in the = future). So the question is how heavy does that media gateway have to be?=20 Does adding DTLS as a key exchange method make they exorbitant to build?=20= It turns out that it doesn't.=20 Remembering that DTLS is only used here as a key-exchange=20 protocol you can just put a DTLS filter in your UDP layer (alongside the = ICE /demux code) and pop the SRTP keys out of it.=20 Those keys can then be used by current SRTP hardware and software.=20 So the overhead is limited to the key-exchange itself. It will make call = set-up mor expensive, but as someone pointed out there are a few websites that seem to cope with https - so I dare say we will = learn to live with it. Tim.= From ibc@aliax.net Fri Apr 26 04:35:35 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2E05421F98B0 for ; Fri, 26 Apr 2013 04:35:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.677 X-Spam-Level: X-Spam-Status: No, score=-1.677 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, MIME_8BIT_HEADER=0.3, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id P7+2mKBNhtAI for ; Fri, 26 Apr 2013 04:35:34 -0700 (PDT) Received: from mail-qc0-x233.google.com (mail-qc0-x233.google.com [IPv6:2607:f8b0:400d:c01::233]) by ietfa.amsl.com (Postfix) with ESMTP id 5143B21F98B2 for ; Fri, 26 Apr 2013 04:35:34 -0700 (PDT) Received: by mail-qc0-f179.google.com with SMTP id v28so1931313qcm.38 for ; Fri, 26 Apr 2013 04:35:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type:x-gm-message-state; bh=jwp2Z5c/QErlQOf0fvz9cu59lbNBuXWGlySoJjJkJ3k=; b=Wzyy1CLesejUx/EPQ3/L1hQbrzgPfHFs/r8Y2KEq+XNQouX5Hk7pausc3Mcu6F27RT 179WGnVqftvM1y1/st77riQ8pqr4k8LRm2EIY27E4791L9n15C6VY/sL8DlQUz+UpRrz pCCngLtB/gqXwfGyrn75xb9l22HC2N3BZxtuLRs3Tok5WTr7MnTxKphCIGQLrBU2LAsQ SVVmZGyKaXexhjsSD4VykDF2EHvsiAdKSic0KJHpnoLHd+qGuSQeP+IejRwGIqGuGsIf NgSGuWqQW9bxJ2QDkycoh97TeGSsNJAR4YofeQ7GS/H/oRz6MqThU3vyot26c0ERX+k8 78nQ== MIME-Version: 1.0 X-Received: by 10.49.71.165 with SMTP id w5mr3991546qeu.36.1366976133612; Fri, 26 Apr 2013 04:35:33 -0700 (PDT) Received: by 10.49.81.175 with HTTP; Fri, 26 Apr 2013 04:35:33 -0700 (PDT) Received: by 10.49.81.175 with HTTP; Fri, 26 Apr 2013 04:35:33 -0700 (PDT) In-Reply-To: <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> Date: Fri, 26 Apr 2013 13:35:33 +0200 Message-ID: From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= To: "Richard P Ejzak, (Richard)" Content-Type: multipart/alternative; boundary=047d7b5dbdccdc599404db41eed3 X-Gm-Message-State: ALoCoQkyJagRX19LykUWfPdVasmLLr+cb22nmQx313sNe10SZlLFnvCEsJN93C/zBmtviU41yZ0c Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 11:35:35 -0000 --047d7b5dbdccdc599404db41eed3 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable SDES is obviously requested for legacy interop at RTP layer. Why do we need SDES in DataChannel if this is a complete new technology? -- I=C3=B1aki Baz Castillo El 25/04/2013 23:55, "Ejzak, Richard P (Richard)" < richard.ejzak@alcatel-lucent.com> escribi=C3=B3: > I also agree that we should support SDES in addition to DTLS-SRTP. > > This raises a further question about SCTP/DTLS for DataChannels. It seem= s > that if we support SDES-SRTP, don't we also need to provide an SDES keyin= g > mechanism for DataChannels? Ekr: What is needed to realize this? > > Richard Ejzak > > > -----Original Message----- > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > Behalf Of Matthew Kaufman (SKYPE) > > Sent: Thursday, April 25, 2013 3:28 PM > > To: Bogineni, Kalyani; 'Cullen Jennings'; rtcweb@ietf.org > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > I agree. The ability to set the cipher suite and keys from JavaScript > > is critical for certain applications. SDES is the best we'll get with > > SDP as the API. DTLS-SRTP-only would be unacceptably limiting. > > > > Matthew Kaufman > > > > > -----Original Message----- > > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > > Behalf Of Bogineni, Kalyani > > > Sent: Thursday, April 25, 2013 1:21 PM > > > To: 'Cullen Jennings'; rtcweb@ietf.org > > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > > > We would like to support the use of SDES as a keying method for > > WebRTC. > > > > > > Kalyani Bogineni > > > Verizon > > > > > > -----Original Message----- > > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > > Behalf Of Cullen Jennings > > > Sent: Thursday, April 25, 2013 11:57 AM > > > To: rtcweb@ietf.org > > > Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > > > > > > The working groups committed some time ago to have a further > > > discussion on whether SDP Security Descriptions (RFC 4568 aka SDES) > > > would be usable as a keying method for WebRTC. As we prepare for > > that > > > discussion, we'd like to have expressions of interest or support for > > > that approach which indicate the general outlines of support > > proposed. > > > If you wish to make such an expression of support, please send it to > > the chairs or the list. > > > > > > Cullen, Magnus, & Ted > > > > > > > > > _______________________________________________ > > > rtcweb mailing list > > > rtcweb@ietf.org > > > https://www.ietf.org/mailman/listinfo/rtcweb > > > _______________________________________________ > > > rtcweb mailing list > > > rtcweb@ietf.org > > > https://www.ietf.org/mailman/listinfo/rtcweb > > > > _______________________________________________ > > rtcweb mailing list > > rtcweb@ietf.org > > https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > --047d7b5dbdccdc599404db41eed3 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

SDES is obviously requested for legacy interop at RTP layer.= Why do we need SDES in DataChannel if this is a complete new technology?

--
I=C3=B1aki Baz Castillo
<ibc@aliax.net>

El 25/04/2013 23:55, "Ejzak, Richard P (Ric= hard)" <richard= .ejzak@alcatel-lucent.com> escribi=C3=B3:
I also agree that we should support SDES in addition to DTLS-SRTP.

This raises a further question about SCTP/DTLS for DataChannels. =C2=A0It s= eems that if we support SDES-SRTP, don't we also need to provide an SDE= S keying mechanism for DataChannels? =C2=A0Ekr: What is needed to realize t= his?

Richard Ejzak

> -----Original Message-----
> From: rtcweb-bounces@ietf.o= rg [mailto:rtcweb-bounces@ie= tf.org] On
> Behalf Of Matthew Kaufman (SKYPE)
> Sent: Thursday, April 25, 2013 3:28 PM
> To: Bogineni, Kalyani; 'Cullen Jennings'; rtcweb@ietf.org
> Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb<= br> >
> I agree. The ability to set the cipher suite and keys from JavaScript<= br> > is critical for certain applications. SDES is the best we'll get w= ith
> SDP as the API. DTLS-SRTP-only would be unacceptably limiting.
>
> Matthew Kaufman
>
> > -----Original Message-----
> > From: rtcweb-bounces@i= etf.org [mailto:rtcweb-bounc= es@ietf.org] On
> > Behalf Of Bogineni, Kalyani
> > Sent: Thursday, April 25, 2013 1:21 PM
> > To: 'Cullen Jennings'; rtcweb@ietf.org
> > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RT= CWeb
> >
> > We would like to support the use of SDES as a keying method for > WebRTC.
> >
> > Kalyani Bogineni
> > Verizon
> >
> > -----Original Message-----
> > From: rtcweb-bounces@i= etf.org [mailto:rtcweb-bounc= es@ietf.org] On
> > Behalf Of Cullen Jennings
> > Sent: Thursday, April 25, 2013 11:57 AM
> > To: rtcweb@ietf.org
> > Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb=
> >
> >
> > The working groups committed some time ago to have a further
> > discussion on whether SDP Security Descriptions (RFC 4568 aka SDE= S)
> > would be usable as a keying method for WebRTC. =C2=A0As we prepar= e for
> that
> > discussion, we'd like to have expressions of interest or supp= ort for
> > that approach which indicate the general outlines of support
> proposed.
> > If you wish to make such an expression of support, please send it= to
> the chairs or the list.
> >
> > Cullen, Magnus, & Ted <The Chairs>
> >
> >
> > _______________________________________________
> > rtcweb mailing list
> > rtcweb@ietf.org
> > https://www.ietf.org/mailman/listinfo/rtcweb
> > _______________________________________________
> > rtcweb mailing list
> > rtcweb@ietf.org
> > https://www.ietf.org/mailman/listinfo/rtcweb
>
> _______________________________________________
> rtcweb mailing list
> rtcweb@ietf.org
> https://www.ietf.org/mailman/listinfo/rtcweb
_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
= https://www.ietf.org/mailman/listinfo/rtcweb
--047d7b5dbdccdc599404db41eed3-- From ibc@aliax.net Fri Apr 26 04:37:45 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2F4A521F87C5 for ; Fri, 26 Apr 2013 04:37:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.177 X-Spam-Level: X-Spam-Status: No, score=-2.177 tagged_above=-999 required=5 tests=[AWL=0.500, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SAgEQlMFodGM for ; Fri, 26 Apr 2013 04:37:44 -0700 (PDT) Received: from mail-qe0-f43.google.com (mail-qe0-f43.google.com [209.85.128.43]) by ietfa.amsl.com (Postfix) with ESMTP id 1876721F98B0 for ; Fri, 26 Apr 2013 04:37:44 -0700 (PDT) Received: by mail-qe0-f43.google.com with SMTP id f6so2699497qej.30 for ; Fri, 26 Apr 2013 04:37:43 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type:x-gm-message-state; bh=ZLDJYoeQ6o27SZr2UnuhoofbMpdohWjBvGejPKzSDqM=; b=iX1Jx9Z0Z5XqzuddMUTGbh16sRTUuRtDaUR6o5mc5YvqwmYDjTGzNaPsJWT+D4K+4/ Ls2pbtMMXfXq22SAvrS7V1BBjnVGt5gBHRY2TquuQNwvBMx4n0Sbl18apPesUBV7dhjA xiAeF1+LjO1uvlUBoi0jsAmder2GPiUUKekZlr+NnhDIYZRJHNhuQ4RANCjny0cIQ+So iATgx9Ru0tfCplAjjktQJ0l7Oj4Ht8OzB8Icz+QsVFrp1I67EcvXSIGNv+s9gCZW3EFe 67el5BrOYOdSKx3kt3kvMNnL//7YBzNyj5Ay1xmZt1RGz/aXFDXROlAgWq+hXL/Sx8ki XpRA== MIME-Version: 1.0 X-Received: by 10.224.32.137 with SMTP id c9mr40032789qad.66.1366976263441; Fri, 26 Apr 2013 04:37:43 -0700 (PDT) Received: by 10.49.81.175 with HTTP; Fri, 26 Apr 2013 04:37:43 -0700 (PDT) Received: by 10.49.81.175 with HTTP; Fri, 26 Apr 2013 04:37:43 -0700 (PDT) In-Reply-To: <91B4F744-2201-4361-A8D8-7D36F47B865C@cisco.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> <91B4F744-2201-4361-A8D8-7D36F47B865C@cisco.com> Date: Fri, 26 Apr 2013 13:37:43 +0200 Message-ID: From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= To: Dan Wing Content-Type: multipart/alternative; boundary=047d7b5d57da99c93604db41f6f3 X-Gm-Message-State: ALoCoQnu2l513kilWC5u0KOooKgzkoRCwIHfloGUnzdJ33nvHmRWHBrw9vkbv0syF8URnkVQWtNm Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 11:37:45 -0000 --047d7b5d57da99c93604db41f6f3 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Such a solution requires a very expensive gateway. Good for vendors but bad for all the rest. -- I=C3=B1aki Baz Castillo El 26/04/2013 00:14, "Dan Wing" escribi=C3=B3: > > On Apr 25, 2013, at 9:39 AM, Alan Johnston > wrote: > > > I'm not a fan of SDES. However, I've come to believe that we need it fo= r > two reasons. > > > > 1. There is a backwards compatibility reason. There are deployed system= s > of SRTP that use SDES or a key agreement that easily maps to it. Just as = we > allowed G.711 for these systems, it seems reasonable to allow SDES as wel= l. > When combined with ICE Lite in a media gateway, this is a scalable intero= p > approach. > > Interworking at scale can be accomplished without SDES on WEBRTC, as I > explained at IETF83 in slides 27-35 of > http://www.ietf.org/proceedings/83/slides/slides-83-rtcweb-3.pdf. > > > 2. We need it or something like it for API reasons. There are cases > where the JavaScript needs to tell the browser what SRTP key to use. > > DTLS-SRTP with EKT can also perform that function, and does it without > disclosing the SRTP key to all the SIP proxies and all the web servers on > the signaling path. > > > Since JSEP uses SDP for this API surface, SDES works for this. Obviousl= y > it is a bad idea to send this key over unsecured channels, but this is > separate from this API issue. > > > > And just to be clear, browser to browser should use DTLS-SRTP, and only > thus mode should be considered "secure" using whatever user interface a > browser chooses. > > But is there a secure mechanism to differentiate browser-to-browser calls > from browser-to-non-browser calls, so we don't have to worry over SDES > downgrade attacks? And for the use-cases where JavaScript has to set the > key, those will often be browser-to-browser calls, meaning that we will > have to support browser-to-browser SDES, contrary to your desire that > browser-to-browser use DTLS-SRTP? DTLS-SRTP with EKT permits the > application to set the SRTP key, and more securely than SDES. > > -d > > > > > > - Alan - > > > > > > > > On Apr 25, 2013, at 11:57 AM, Cullen Jennings wrote: > > > >> > >> The working groups committed some time ago to have a further discussio= n > on whether SDP Security Descriptions (RFC 4568 aka SDES) would be usable = as > a keying method for WebRTC. As we prepare for that discussion, we'd like > to have expressions of interest or support for that approach which indica= te > the general outlines of support proposed. If you wish to make such an > expression of support, please send it to the chairs or the list. > >> > >> Cullen, Magnus, & Ted > >> > >> > >> _______________________________________________ > >> rtcweb mailing list > >> rtcweb@ietf.org > >> https://www.ietf.org/mailman/listinfo/rtcweb > > _______________________________________________ > > rtcweb mailing list > > rtcweb@ietf.org > > https://www.ietf.org/mailman/listinfo/rtcweb > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > --047d7b5d57da99c93604db41f6f3 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

Such a solution requires a very expensive gateway. Good for = vendors but bad for all the rest.

--
I=C3=B1aki Baz Castillo
<ibc@aliax.net>

El 26/04/2013 00:14, "Dan Wing" <dwing@cisco.com> escribi=C3=B3:

On Apr 25, 2013, at 9:39 AM, Alan Johnston <alan.b.johnston@gmail.com> wrote:

> I'm not a fan of SDES. However, I've come to believe that we n= eed it for two reasons.
>
> 1. There is a backwards compatibility reason. There are deployed syste= ms of SRTP that use SDES or a key agreement that easily maps to it. Just as= we allowed G.711 for these systems, it seems reasonable to allow SDES as w= ell. When combined with ICE Lite in a media gateway, this is a scalable int= erop approach.

Interworking at scale can be accomplished without SDES on WEBRTC, as I expl= ained at IETF83 in slides 27-35 of http://www.ietf.org/= proceedings/83/slides/slides-83-rtcweb-3.pdf.

> 2. We need it or something like it for API reasons. There are cases wh= ere the JavaScript needs to tell the browser what SRTP key to use.

DTLS-SRTP with EKT can also perform that function, and does it without disc= losing the SRTP key to all the SIP proxies and all the web servers on the s= ignaling path.

> Since JSEP uses SDP for this API surface, SDES works for this. Obvious= ly it is a bad idea to send this key over unsecured channels, but this is s= eparate from this API issue.
>
> And just to be clear, browser to browser should use DTLS-SRTP, and onl= y thus mode should be considered "secure" using whatever user int= erface a browser chooses.

But is there a secure mechanism to differentiate browser-to-browser calls f= rom browser-to-non-browser calls, so we don't have to worry over SDES d= owngrade attacks? =C2=A0And for the use-cases where JavaScript has to set t= he key, those will often be browser-to-browser calls, meaning that we will = have to support browser-to-browser SDES, contrary to your desire that brows= er-to-browser use DTLS-SRTP? =C2=A0DTLS-SRTP with EKT permits the applicati= on to set the SRTP key, and more securely than SDES.

-d


>
> - Alan -
>
>
>
> On Apr 25, 2013, at 11:57 AM, Cullen Jennings <fluffy@iii.ca> wrote:
>
>>
>> The working groups committed some time ago to have a further discu= ssion on whether SDP Security Descriptions (RFC 4568 aka SDES) would be usa= ble as a keying method for WebRTC. =C2=A0As we prepare for that discussion,= we'd like to have expressions of interest or support for that approach= which indicate the general outlines of support proposed. =C2=A0If you wish= to make such an expression of support, please send it to the chairs or the= list.
>>
>> Cullen, Magnus, & Ted <The Chairs>
>>
>>
>> _______________________________________________
>> rtcweb mailing list
>> rtcweb@ietf.org
>> https://www.ietf.org/mailman/listinfo/rtcweb
> _______________________________________________
> rtcweb mailing list
> rtcweb@ietf.org
> https://www.ietf.org/mailman/listinfo/rtcweb

_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
= https://www.ietf.org/mailman/listinfo/rtcweb
--047d7b5d57da99c93604db41f6f3-- From tim@phonefromhere.com Fri Apr 26 06:16:54 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CCA1621F9925 for ; Fri, 26 Apr 2013 06:16:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.449 X-Spam-Level: X-Spam-Status: No, score=-2.449 tagged_above=-999 required=5 tests=[AWL=-0.151, BAYES_00=-2.599, HTML_MESSAGE=0.001, MIME_8BIT_HEADER=0.3] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yF8NPoaAb1S5 for ; Fri, 26 Apr 2013 06:16:54 -0700 (PDT) Received: from smtp003.apm-internet.net (smtp003.apm-internet.net [85.119.248.52]) by ietfa.amsl.com (Postfix) with ESMTP id DE3CE21F9924 for ; Fri, 26 Apr 2013 06:16:53 -0700 (PDT) Received: (qmail 51504 invoked from network); 26 Apr 2013 13:16:52 -0000 X-AV-Scan: clean Received: from unknown (HELO zimbra003.verygoodemail.com) (85.119.248.218) by smtp003.apm-internet.net with SMTP; 26 Apr 2013 13:16:52 -0000 Received: from zimbra003.verygoodemail.com (localhost [127.0.0.1]) by zimbra003.verygoodemail.com (Postfix) with ESMTP id 1A85A18A04CE; Fri, 26 Apr 2013 14:16:52 +0100 (BST) Received: from [192.67.4.33] (unknown [192.67.4.33]) by zimbra003.verygoodemail.com (Postfix) with ESMTPSA id F1B1918A0494; Fri, 26 Apr 2013 14:16:51 +0100 (BST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: multipart/alternative; boundary="Apple-Mail=_2DB2B8A7-ED6F-4355-84F4-6B8B72CDA328" From: Tim Panton In-Reply-To: Date: Fri, 26 Apr 2013 14:16:52 +0100 Message-Id: <95219856-8365-4A7E-BD0B-4EECE8868498@phonefromhere.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> <91B4F744-2201-4361-A8D8-7D36F47B865C@cisco.com> To: =?iso-8859-1?Q?I=F1aki_Baz_Castillo?= X-Mailer: Apple Mail (2.1283) Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 13:16:54 -0000 --Apple-Mail=_2DB2B8A7-ED6F-4355-84F4-6B8B72CDA328 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 On 26 Apr 2013, at 12:37, I=F1aki Baz Castillo wrote: > Such a solution requires a very expensive gateway. Good for vendors = but bad for all the rest. >=20 I don't understand why the DTLS gateway would be so expensive. It is = _exactly_ the same=20 (conceptually) as the ICE processing - you filter off a few UDP packets = from the stream, do some stuff, send replies then once you are happy you punt some dynamic = settings back up to the (s)rtp=20 layer. T. --Apple-Mail=_2DB2B8A7-ED6F-4355-84F4-6B8B72CDA328 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=iso-8859-1

Such a solution requires a very expensive = gateway. Good for vendors but bad for all the = rest.


I don't understand why the = DTLS gateway would be so expensive. It is _exactly_ the = same 
(conceptually) as the ICE processing - you filter = off a few UDP packets from the stream, do some
stuff, send = replies then once you are happy you punt some dynamic settings back up = to the = (s)rtp 
layer.

T.

= --Apple-Mail=_2DB2B8A7-ED6F-4355-84F4-6B8B72CDA328-- From ibc@aliax.net Fri Apr 26 06:19:25 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 65F6021F9934 for ; Fri, 26 Apr 2013 06:19:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.677 X-Spam-Level: X-Spam-Status: No, score=-1.677 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, MIME_8BIT_HEADER=0.3, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ToIktiVux3Jf for ; Fri, 26 Apr 2013 06:19:25 -0700 (PDT) Received: from mail-qc0-x22e.google.com (mail-qc0-x22e.google.com [IPv6:2607:f8b0:400d:c01::22e]) by ietfa.amsl.com (Postfix) with ESMTP id C02B321F992E for ; Fri, 26 Apr 2013 06:19:24 -0700 (PDT) Received: by mail-qc0-f174.google.com with SMTP id z24so2074274qcq.19 for ; Fri, 26 Apr 2013 06:19:24 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type:x-gm-message-state; bh=I3Vx2ddVHUrLlyFryLef59T2vM/fP400IWMUnsJ49a4=; b=CSG34fxvVO9KOB/8BMeI9JTuuIHeIQN7OQubX7GmbLvOXU8E1r8ER7ynQ+2YBJ8V81 ROU0VmJ3Ukzdmaa+cSo5x97BzjGbA1UwQAUNnEvTQMNpTsfShVlNroXBIqd8ykKVFEYH wW2WZ5VDeuw9HDai0BKyYL9omZUYIJ8yY1bLHuemLU4k6CSseP2sfu8SxyGwjhd9COSi 8NXa43r+DBa/pVEL2UXgf3RTeDSZ9IfOI6g4E9nio1yvau0/9PYaUGApbJcZD5DQSsap 0xK0ZpjYM53m3k0EcLYjeuwCxCJnL/axN+abqLmd8OftzL3wCTrCeqN5aTBAU9XoVZlT 0mbQ== MIME-Version: 1.0 X-Received: by 10.224.184.204 with SMTP id cl12mr40487521qab.0.1366982364234; Fri, 26 Apr 2013 06:19:24 -0700 (PDT) Received: by 10.49.81.175 with HTTP; Fri, 26 Apr 2013 06:19:23 -0700 (PDT) Received: by 10.49.81.175 with HTTP; Fri, 26 Apr 2013 06:19:23 -0700 (PDT) In-Reply-To: <95219856-8365-4A7E-BD0B-4EECE8868498@phonefromhere.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> <91B4F744-2201-4361-A8D8-7D36F47B865C@cisco.com> <95219856-8365-4A7E-BD0B-4EECE8868498@phonefromhere.com> Date: Fri, 26 Apr 2013 15:19:23 +0200 Message-ID: From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= To: Tim Panton Content-Type: multipart/alternative; boundary=20cf302ef9d83c19ac04db4362f0 X-Gm-Message-State: ALoCoQkTGAg0WGml6fCAwch2g4j1eRS8GlumpNBXSXCLt6exzTFq62D6gB7MyJC+dv/HCei2iiGr Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 13:19:25 -0000 --20cf302ef9d83c19ac04db4362f0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable The problem is when EKT is also used and the gateway must send SIP reINVITE by itself as the proposed "solution diagram" shows. That is not just a media gateway. -- I=C3=B1aki Baz Castillo El 26/04/2013 15:16, "Tim Panton" escribi=C3=B3: > > On 26 Apr 2013, at 12:37, I=C3=B1aki Baz Castillo wrote: > > Such a solution requires a very expensive gateway. Good for vendors but > bad for all the rest. > > > I don't understand why the DTLS gateway would be so expensive. It is > _exactly_ the same > (conceptually) as the ICE processing - you filter off a few UDP packets > from the stream, do some > stuff, send replies then once you are happy you punt some dynamic setting= s > back up to the (s)rtp > layer. > > T. > > --20cf302ef9d83c19ac04db4362f0 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

The problem is when EKT is also used and the gateway must se= nd SIP reINVITE by itself as the proposed "solution diagram" show= s. That is not just a media gateway.

--
I=C3=B1aki Baz Castillo
<ibc@aliax.net>

El 26/04/2013 15:16, "Tim Panton" <= tim@phonefromhere.com> escr= ibi=C3=B3:

On 26 Apr 2013, at 12:37,= I=C3=B1aki Baz Castillo wrote:

Such a solution requires a very expensive gateway. Good for vendor= s but bad for all the rest.


I don't understand why the DTLS ga= teway would be so expensive. It is _exactly_ the same=C2=A0
(conc= eptually) as the ICE processing - you filter off a few UDP packets from the= stream, do some
stuff, send replies then once you are happy you punt some dynamic sett= ings back up to the (s)rtp=C2=A0
layer.

= T.

--20cf302ef9d83c19ac04db4362f0-- From matthew@matthew.at Fri Apr 26 06:24:03 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1314421F993F for ; Fri, 26 Apr 2013 06:24:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.43 X-Spam-Level: X-Spam-Status: No, score=-1.43 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_AT=0.424, HOST_EQ_AT=0.745] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tnR2Kw+3fdGW for ; Fri, 26 Apr 2013 06:24:02 -0700 (PDT) Received: from where.matthew.at (where.matthew.at [198.202.199.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9FDDA21F9940 for ; Fri, 26 Apr 2013 06:24:02 -0700 (PDT) Received: from [10.10.155.2] (unknown [10.10.155.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by where.matthew.at (Postfix) with ESMTP id 758A3230005 for ; Fri, 26 Apr 2013 06:24:00 -0700 (PDT) Message-ID: <517A7FF3.9050702@matthew.at> Date: Fri, 26 Apr 2013 06:24:03 -0700 From: Matthew Kaufman User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> <91B4F744-2201-4361-A8D8-7D36F47B865C@cisco.com> <95219856-8365-4A7E-BD0B-4EECE8868498@phonefromhere.com> In-Reply-To: <95219856-8365-4A7E-BD0B-4EECE8868498@phonefromhere.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 13:24:03 -0000 On 4/26/2013 6:16 AM, Tim Panton wrote: > > On 26 Apr 2013, at 12:37, Iñaki Baz Castillo wrote: > >> Such a solution requires a very expensive gateway. Good for vendors >> but bad for all the rest. >> > > I don't understand why the DTLS gateway would be so expensive. It is > _exactly_ the same > (conceptually) as the ICE processing - you filter off a few UDP > packets from the stream, do some > stuff, send replies then once you are happy you punt some dynamic > settings back up to the (s)rtp > layer. > The CPU-seconds of cryptography required are markedly different, especially on low-end processors used by some of the distributed gateway solutions. Matthew Kaufman From matthew@matthew.at Fri Apr 26 06:25:53 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DA22521F993F for ; Fri, 26 Apr 2013 06:25:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.43 X-Spam-Level: X-Spam-Status: No, score=-1.43 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HELO_EQ_AT=0.424, HOST_EQ_AT=0.745, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id W-Rzo99GE7YY for ; Fri, 26 Apr 2013 06:25:53 -0700 (PDT) Received: from where.matthew.at (where.matthew.at [198.202.199.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5DB8D21F985F for ; Fri, 26 Apr 2013 06:25:53 -0700 (PDT) Received: from [10.10.155.2] (unknown [10.10.155.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by where.matthew.at (Postfix) with ESMTP id 51DEB230005; Fri, 26 Apr 2013 06:25:53 -0700 (PDT) Message-ID: <517A8063.6040908@matthew.at> Date: Fri, 26 Apr 2013 06:25:55 -0700 From: Matthew Kaufman User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: Eric Rescorla References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <517A00AE.2090804@matthew.at> In-Reply-To: Content-Type: multipart/alternative; boundary="------------050201000900000705060007" Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 13:25:54 -0000 This is a multi-part message in MIME format. --------------050201000900000705060007 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit On 4/25/2013 11:08 PM, Eric Rescorla wrote: > > > On Thu, Apr 25, 2013 at 9:21 PM, Matthew Kaufman > wrote: > > On 4/25/2013 4:19 PM, Eric Rescorla wrote: > > > It's certainly true that the site has access to the media with > DTLS if you > don't use identity assertions/isolated streams. However, what > it doesn't > have is *invisible* access. I.e., it must do something that is > user visible, > which allows for the detection of cheating by the site. By > contrast, if SDES is used > then the site can simply passively monitor all your traffic, > or at least > any that goes through its network and you can't detect it. > > > That really depends on what you mean by "user visible" doesn't it? > If you mean "the user is watching to see that all their packets go > to what they know is the verified IP address of their buddy" then > sure. But if you mean "the user is looking at their web browser > user interface" or even "the user was worried mid-call so checked > to see where the packets were going" then I think not, as all that > needs to happen is for the call to be set up with a middlebox in > the path that the site claims is necessary for the call to work > (meets the UI test), keys set with EKT, and then a little ICE > renegotiation and the middlebox goes away from the path (meets > even the second test). > > > What I mean is that you can use fingerprint checks (admittedly > inconvenient) to > detect active attacks. Obviously, current browser UIs don't support > that, but > I expect them to eventually. > Unless you are in a Hangouts-like scenario, where every call goes to a mixer and so the fingerprints for all calls look the same, whether you're being intercepted or not. Matthew Kaufman --------------050201000900000705060007 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
On 4/25/2013 11:08 PM, Eric Rescorla wrote:


On Thu, Apr 25, 2013 at 9:21 PM, Matthew Kaufman <matthew@matthew.at> wrote:
On 4/25/2013 4:19 PM, Eric Rescorla wrote:

It's certainly true that the site has access to the media with DTLS if you
don't use identity assertions/isolated streams. However, what it doesn't
have is *invisible* access. I.e., it must do something that is user visible,
which allows for the detection of cheating by the site. By contrast, if SDES is used
then the site can simply passively monitor all your traffic, or at least
any that goes through its network and you can't detect it.


That really depends on what you mean by "user visible" doesn't it? If you mean "the user is watching to see that all their packets go to what they know is the verified IP address of their buddy" then sure. But if you mean "the user is looking at their web browser user interface" or even "the user was worried mid-call so checked to see where the packets were going" then I think not, as all that needs to happen is for the call to be set up with a middlebox in the path that the site claims is necessary for the call to work (meets the UI test), keys set with EKT, and then a little ICE renegotiation and the middlebox goes away from the path (meets even the second test).

What I mean is that you can use fingerprint checks (admittedly inconvenient) to
detect active attacks. Obviously, current browser UIs don't support that, but
I expect them to eventually.


Unless you are in a Hangouts-like scenario, where every call goes to a mixer and so the fingerprints for all calls look the same, whether you're being intercepted or not.

Matthew Kaufman

--------------050201000900000705060007-- From matthew@matthew.at Fri Apr 26 06:28:59 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4120621F9918 for ; Fri, 26 Apr 2013 06:28:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.43 X-Spam-Level: X-Spam-Status: No, score=-1.43 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, HELO_EQ_AT=0.424, HOST_EQ_AT=0.745] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 39fM51uFTtV1 for ; Fri, 26 Apr 2013 06:28:58 -0700 (PDT) Received: from where.matthew.at (where.matthew.at [198.202.199.1]) by ietfa.amsl.com (Postfix) with ESMTP id DD36A21F9916 for ; Fri, 26 Apr 2013 06:28:58 -0700 (PDT) Received: from [10.10.155.2] (unknown [10.10.155.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by where.matthew.at (Postfix) with ESMTP id B2E64148040 for ; Fri, 26 Apr 2013 06:28:58 -0700 (PDT) Message-ID: <517A811D.8010501@matthew.at> Date: Fri, 26 Apr 2013 06:29:01 -0700 From: Matthew Kaufman User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <5179BEEF.4000600@jesup.org> <517A0237.9030008@matthew.at> <517A0FB3.6010007@alvestrand.no> In-Reply-To: <517A0FB3.6010007@alvestrand.no> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 13:28:59 -0000 On 4/25/2013 10:25 PM, Harald Alvestrand wrote: > On 04/26/2013 06:27 AM, Matthew Kaufman wrote: >> >> This is true anyway, because even if we only allow DTLS-SRTP, we will >> allow cases like (as an example) Google Hangouts... which will no >> doubt be implemented by having the box in the middle be who you're >> calling and doing the DTLS exchange with. And then yes, you're >> trusting the application and website and its mixer with your media. > > Strictly speaking, you're trusting the mixer with your media. > > You trust the website to serve up the application, and you trust the > application to choose the mixer. This offers up an easy attack for any > website that has a mixer it coordinates with - but it's the mixer you > trust with your media. > > It's nice to be precise. But all must be trusted. The application can send you to an evil mixer, the website can serve up an application or tamper with the signaling in order to send you to an evil mixer, and the mixer can itself be evil. And the application can use GetUserMedia to capture a second copy of your media and send it somewhere else, or the website can modify the application (or in some cases, the signaling) to do that as well. You're trusting everything to not do something that results in your media being intercepted. Matthew Kaufman From tim@phonefromhere.com Fri Apr 26 06:29:16 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 267BA21F992F for ; Fri, 26 Apr 2013 06:29:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.524 X-Spam-Level: X-Spam-Status: No, score=-2.524 tagged_above=-999 required=5 tests=[AWL=0.075, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zNsoh3BaMYRQ for ; Fri, 26 Apr 2013 06:29:15 -0700 (PDT) Received: from smtp004.apm-internet.net (smtp004.apm-internet.net [85.119.248.54]) by ietfa.amsl.com (Postfix) with ESMTP id 3712D21F9916 for ; Fri, 26 Apr 2013 06:29:15 -0700 (PDT) Received: (qmail 93059 invoked from network); 26 Apr 2013 13:29:13 -0000 X-AV-Scan: clean Received: from unknown (HELO zimbra003.verygoodemail.com) (85.119.248.218) by smtp004.apm-internet.net with SMTP; 26 Apr 2013 13:29:13 -0000 Received: from zimbra003.verygoodemail.com (localhost [127.0.0.1]) by zimbra003.verygoodemail.com (Postfix) with ESMTP id E051A18A0535; Fri, 26 Apr 2013 14:29:12 +0100 (BST) Received: from [192.67.4.33] (unknown [192.67.4.33]) by zimbra003.verygoodemail.com (Postfix) with ESMTPSA id CA75718A04CE; Fri, 26 Apr 2013 14:29:12 +0100 (BST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=iso-8859-1 From: Tim Panton In-Reply-To: <517A7FF3.9050702@matthew.at> Date: Fri, 26 Apr 2013 14:29:13 +0100 Content-Transfer-Encoding: quoted-printable Message-Id: <41A36FC7-9F29-45E6-8B98-4B3AB51094CD@phonefromhere.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> <91B4F744-2201-4361-A8D8-7D36F47B865C@cisco.com> <95219856-8365-4A7E-BD0B-4EECE8868498@phonefromhere.com> <517A7FF3.9050702@matthew.at> To: Matthew Kaufman X-Mailer: Apple Mail (2.1283) Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 13:29:16 -0000 On 26 Apr 2013, at 14:24, Matthew Kaufman wrote: > On 4/26/2013 6:16 AM, Tim Panton wrote: >>=20 >> On 26 Apr 2013, at 12:37, I=F1aki Baz Castillo wrote: >>=20 >>> Such a solution requires a very expensive gateway. Good for vendors = but bad for all the rest. >>>=20 >>=20 >> I don't understand why the DTLS gateway would be so expensive. It is = _exactly_ the same >> (conceptually) as the ICE processing - you filter off a few UDP = packets from the stream, do some >> stuff, send replies then once you are happy you punt some dynamic = settings back up to the (s)rtp >> layer. >>=20 >=20 > The CPU-seconds of cryptography required are markedly different, = especially on low-end processors used by some of the distributed gateway = solutions. True, but only at call set-up time, not for the life of the call. I'd = want to see numbers on this before we select to adopt even=20 more complexity for the sake of a theoretical legacy interop = requirement. T. From matthew@matthew.at Fri Apr 26 06:31:48 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 783BC21F9960 for ; Fri, 26 Apr 2013 06:31:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.43 X-Spam-Level: X-Spam-Status: No, score=-1.43 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, HELO_EQ_AT=0.424, HOST_EQ_AT=0.745] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TxQvykUiBqvp for ; Fri, 26 Apr 2013 06:31:47 -0700 (PDT) Received: from where.matthew.at (where.matthew.at [198.202.199.1]) by ietfa.amsl.com (Postfix) with ESMTP id ED10B21F995B for ; Fri, 26 Apr 2013 06:31:47 -0700 (PDT) Received: from [10.10.155.2] (unknown [10.10.155.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by where.matthew.at (Postfix) with ESMTP id E0D251480C1 for ; Fri, 26 Apr 2013 06:31:47 -0700 (PDT) Message-ID: <517A81C6.1090502@matthew.at> Date: Fri, 26 Apr 2013 06:31:50 -0700 From: Matthew Kaufman User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <5179BEEF.4000600@jesup.org> <517A0237.9030008@matthew.at> <517A167A.9090105@jesup.org> In-Reply-To: <517A167A.9090105@jesup.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 13:31:48 -0000 On 4/25/2013 10:54 PM, Randell Jesup wrote: > > That's always the problem with strong security... It has to be > unobtrusive-but-functional in the "normal" cases to get widely used. > Green-field encryption can be fairly easily strong because of lack of > needing to interop. > Even that isn't true. See, for instance, Zooko's triangle [1]. Getting strong encryption with useful authentication that protects a naive user from evil applications and signaling services is very very hard, even if you ignore interop. Matthew Kaufman [1] http://en.wikipedia.org/wiki/Zooko's_triangle From harald@alvestrand.no Fri Apr 26 06:33:13 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 39A9921F9964 for ; Fri, 26 Apr 2013 06:33:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.599 X-Spam-Level: X-Spam-Status: No, score=-110.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XYAj66YDZJFN for ; Fri, 26 Apr 2013 06:33:12 -0700 (PDT) Received: from eikenes.alvestrand.no (eikenes.alvestrand.no [158.38.152.233]) by ietfa.amsl.com (Postfix) with ESMTP id CACED21F995E for ; Fri, 26 Apr 2013 06:33:11 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by eikenes.alvestrand.no (Postfix) with ESMTP id 75AE539E197 for ; Fri, 26 Apr 2013 15:33:09 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at eikenes.alvestrand.no Received: from eikenes.alvestrand.no ([127.0.0.1]) by localhost (eikenes.alvestrand.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lSVgeaJ9g7kI for ; Fri, 26 Apr 2013 15:33:09 +0200 (CEST) Received: from [192.168.13.123] (unknown [110.15.35.10]) by eikenes.alvestrand.no (Postfix) with ESMTPSA id 2DD0639E182 for ; Fri, 26 Apr 2013 15:33:07 +0200 (CEST) Message-ID: <517A820F.9050807@alvestrand.no> Date: Fri, 26 Apr 2013 15:33:03 +0200 From: Harald Alvestrand User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> <91B4F744-2201-4361-A8D8-7D36F47B865C@cisco.com> <95219856-8365-4A7E-BD0B-4EECE8868498@phonefromhere.com> In-Reply-To: <95219856-8365-4A7E-BD0B-4EECE8868498@phonefromhere.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 13:33:13 -0000 On 04/26/2013 03:16 PM, Tim Panton wrote: > > On 26 Apr 2013, at 12:37, Iñaki Baz Castillo wrote: > >> Such a solution requires a very expensive gateway. Good for vendors >> but bad for all the rest. >> > > I don't understand why the DTLS gateway would be so expensive. It is > _exactly_ the same > (conceptually) as the ICE processing - you filter off a few UDP > packets from the stream, do some > stuff, send replies then once you are happy you punt some dynamic > settings back up to the (s)rtp > layer. So you're saying that the gateway doesn't have to decrypt and re-encrypt the packets? I think EKT may be a problem, as Inaki pointed out, but I have less qualms about supporting DTLS and making it optional to use EKT on some calls than I have about mandating support for SDES. From matthew@matthew.at Fri Apr 26 06:33:58 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E5A6D21F9968 for ; Fri, 26 Apr 2013 06:33:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.429 X-Spam-Level: X-Spam-Status: No, score=-1.429 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HELO_EQ_AT=0.424, HOST_EQ_AT=0.745, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5q4TQKyUQLWx for ; Fri, 26 Apr 2013 06:33:58 -0700 (PDT) Received: from where.matthew.at (where.matthew.at [198.202.199.1]) by ietfa.amsl.com (Postfix) with ESMTP id 21EA821F842B for ; Fri, 26 Apr 2013 06:33:58 -0700 (PDT) Received: from [10.10.155.2] (unknown [10.10.155.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by where.matthew.at (Postfix) with ESMTP id 129BE1480C1; Fri, 26 Apr 2013 06:33:58 -0700 (PDT) Message-ID: <517A8248.4020604@matthew.at> Date: Fri, 26 Apr 2013 06:34:00 -0700 From: Matthew Kaufman User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: Ted Hardie References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <5179BEEF.4000600@jesup.org> <517A0237.9030008@matthew.at> In-Reply-To: Content-Type: multipart/alternative; boundary="------------010408090705060607080808" Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 13:33:59 -0000 This is a multi-part message in MIME format. --------------010408090705060607080808 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit On 4/25/2013 10:55 PM, Ted Hardie wrote: > On Thu, Apr 25, 2013 at 9:27 PM, Matthew Kaufman > wrote: > > O > > Yes, some gateway scenarios might be cheaper/easier with SDES, > but I see the primary use-cases for WebRTC to be > browser-to-browser, not browser-legacy. > > > Just because the charter was mistakenly written that way doesn't > mean it is true. > > > I remind you that the actual title of the group is: > > "Real-Time Communication in WEB-browsers (rtcweb)". While you may > disagree with the charter, please remember that it's not fundamentally > a prediction about what the eventual balance of flows will be. It's a > statement about where the balance of effort in the group should go. > To me as an individual, it implies that we should not make trade-offs > that optimize a non-browser use case at the expense of the browser use > case except in pretty extraordinary circumstances. > Adding SDES helps a non-browser use case with no expense to the browser use cases except for the small amount of additional code. If you don't believe that (because you think it reduces the browser-to-browser security) then I will point you to browser use cases include multi-party scenarios that will require EKT, and then show how the security of EKT is nearly equivalent. Matthew Kaufman --------------010408090705060607080808 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
On 4/25/2013 10:55 PM, Ted Hardie wrote:
On Thu, Apr 25, 2013 at 9:27 PM, Matthew Kaufman <matthew@matthew.at> wrote:
O
Yes, some gateway scenarios might be cheaper/easier with SDES, but I see the primary use-cases for WebRTC to be browser-to-browser, not browser-legacy.

Just because the charter was mistakenly written that way doesn't mean it is true.

I remind you that the actual title of the group is:

"Real-Time Communication in WEB-browsers (rtcweb)".  While you may disagree with the charter, please remember that it's not fundamentally a prediction about what the eventual balance of flows will be.  It's a statement about where the balance of effort in the group should go.   To me as an individual, it implies that we should not make trade-offs that optimize a non-browser use case at the expense of the browser use case except in pretty extraordinary circumstances.


Adding SDES helps a non-browser use case with no expense to the browser use cases except for the small amount of additional code.

If you don't believe that (because you think it reduces the browser-to-browser security) then I will point you to  browser use cases include multi-party scenarios that will require EKT, and then show how the security of EKT is nearly equivalent.

Matthew Kaufman

--------------010408090705060607080808-- From tim@phonefromhere.com Fri Apr 26 06:43:24 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D795721F986F for ; Fri, 26 Apr 2013 06:43:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.549 X-Spam-Level: X-Spam-Status: No, score=-2.549 tagged_above=-999 required=5 tests=[AWL=0.050, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id aM4DXdtwqZbl for ; Fri, 26 Apr 2013 06:43:24 -0700 (PDT) Received: from smtp004.apm-internet.net (smtp004.apm-internet.net [85.119.248.54]) by ietfa.amsl.com (Postfix) with ESMTP id 98A4221F93D8 for ; Fri, 26 Apr 2013 06:43:22 -0700 (PDT) Received: (qmail 7801 invoked from network); 26 Apr 2013 13:43:21 -0000 X-AV-Scan: clean Received: from unknown (HELO zimbra003.verygoodemail.com) (85.119.248.218) by smtp004.apm-internet.net with SMTP; 26 Apr 2013 13:43:21 -0000 Received: from zimbra003.verygoodemail.com (localhost [127.0.0.1]) by zimbra003.verygoodemail.com (Postfix) with ESMTP id C65AD18A04CE; Fri, 26 Apr 2013 14:43:21 +0100 (BST) Received: from [192.67.4.33] (unknown [192.67.4.33]) by zimbra003.verygoodemail.com (Postfix) with ESMTPSA id B080A18A034F; Fri, 26 Apr 2013 14:43:21 +0100 (BST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=iso-8859-1 From: Tim Panton In-Reply-To: <517A820F.9050807@alvestrand.no> Date: Fri, 26 Apr 2013 14:43:22 +0100 Content-Transfer-Encoding: quoted-printable Message-Id: <1172907E-B2E1-4764-94CA-BDB00435B86A@phonefromhere.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> <91B4F744-2201-4361-A8D8-7D36F47B865C@cisco.com> <95219856-8365-4A7E-BD0B-4EECE8868498@phonefromhere.com> <517A820F.9050807@alvestrand.no> To: Harald Alvestrand X-Mailer: Apple Mail (2.1283) Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 13:43:25 -0000 On 26 Apr 2013, at 14:33, Harald Alvestrand wrote: > On 04/26/2013 03:16 PM, Tim Panton wrote: >>=20 >> On 26 Apr 2013, at 12:37, I=F1aki Baz Castillo wrote: >>=20 >>> Such a solution requires a very expensive gateway. Good for vendors = but bad for all the rest. >>>=20 >>=20 >> I don't understand why the DTLS gateway would be so expensive. It is = _exactly_ the same >> (conceptually) as the ICE processing - you filter off a few UDP = packets from the stream, do some >> stuff, send replies then once you are happy you punt some dynamic = settings back up to the (s)rtp >> layer. >=20 > So you're saying that the gateway doesn't have to decrypt and = re-encrypt the packets? It depends where it is a gateway to. I'm claiming that the huge majority = of the legacy side endpoints are going to be wanting plain RTP anyhow, so no need to re-encrypt. Another chunk of functionality is local processing (conference mixing, = call recording, ivr etc) where=20 the device (or it's cluster) is the endpoint, so again no need to re- = encrypt. The decryption can be handled by existing SRTP components, which just = need to be fed the keys generated by the DTLS exchange. (And I'd add that we got into this mess by sticking with O/A semantics. = ) T. From tim@phonefromhere.com Fri Apr 26 06:47:57 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BA73321F93D8 for ; Fri, 26 Apr 2013 06:47:57 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.561 X-Spam-Level: X-Spam-Status: No, score=-2.561 tagged_above=-999 required=5 tests=[AWL=0.037, BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RKmqzn1Zs6xL for ; Fri, 26 Apr 2013 06:47:57 -0700 (PDT) Received: from smtp003.apm-internet.net (smtp003.apm-internet.net [85.119.248.52]) by ietfa.amsl.com (Postfix) with ESMTP id 9745B21F990C for ; Fri, 26 Apr 2013 06:47:56 -0700 (PDT) Received: (qmail 82092 invoked from network); 26 Apr 2013 13:47:55 -0000 X-AV-Scan: clean Received: from unknown (HELO zimbra003.verygoodemail.com) (85.119.248.218) by smtp003.apm-internet.net with SMTP; 26 Apr 2013 13:47:55 -0000 Received: from zimbra003.verygoodemail.com (localhost [127.0.0.1]) by zimbra003.verygoodemail.com (Postfix) with ESMTP id 93CCA18A04CE; Fri, 26 Apr 2013 14:47:55 +0100 (BST) Received: from [192.67.4.33] (unknown [192.67.4.33]) by zimbra003.verygoodemail.com (Postfix) with ESMTPSA id 6E2A218A034F; Fri, 26 Apr 2013 14:47:55 +0100 (BST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: multipart/alternative; boundary="Apple-Mail=_9DAD43A1-4F0C-4AB4-A395-4D2277F27D58" From: Tim Panton In-Reply-To: <517A8248.4020604@matthew.at> Date: Fri, 26 Apr 2013 14:47:55 +0100 Message-Id: <1BF967D4-2EEA-489D-977E-E5D711966753@phonefromhere.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <5179BEEF.4000600@jesup.org> <517A0237.9030008@matthew.at> <517A8248.4020604@matthew.at> To: Matthew Kaufman X-Mailer: Apple Mail (2.1283) Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 13:47:57 -0000 --Apple-Mail=_9DAD43A1-4F0C-4AB4-A395-4D2277F27D58 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 On 26 Apr 2013, at 14:34, Matthew Kaufman wrote: > On 4/25/2013 10:55 PM, Ted Hardie wrote: >> On Thu, Apr 25, 2013 at 9:27 PM, Matthew Kaufman = wrote: >> O >> Yes, some gateway scenarios might be cheaper/easier with SDES, but I = see the primary use-cases for WebRTC to be browser-to-browser, not = browser-legacy. >>=20 >> Just because the charter was mistakenly written that way doesn't mean = it is true. >>=20 >> I remind you that the actual title of the group is: >>=20 >> "Real-Time Communication in WEB-browsers (rtcweb)". While you may = disagree with the charter, please remember that it's not fundamentally a = prediction about what the eventual balance of flows will be. It's a = statement about where the balance of effort in the group should go. To = me as an individual, it implies that we should not make trade-offs that = optimize a non-browser use case at the expense of the browser use case = except in pretty extraordinary circumstances. >>=20 >=20 > Adding SDES helps a non-browser use case with no expense to the = browser use cases except for the small amount of additional code. I don't agree, it further complicates the existing hideous mess that is = the SDP in the browser. Given where we are, we should be looking for = ways to simplify that, not complicate it. If anyone still thinks that SDP is just a blob not an API surface, take = a look at the 'reference implementation' of browser to browser interop. = https://code.google.com/p/webrtc-samples/source/browse/trunk/apprtc/index.= html I count around 100 lines of javascript munging the SDP. T.= --Apple-Mail=_9DAD43A1-4F0C-4AB4-A395-4D2277F27D58 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=iso-8859-1
On 26 Apr 2013, at 14:34, Matthew Kaufman wrote:

On 4/25/2013 10:55 PM, Ted Hardie wrote:
On Thu, Apr 25, 2013 at 9:27 PM, Matthew Kaufman <matthew@matthew.at> wrote:
O
Yes, some gateway scenarios might be cheaper/easier with SDES, but I see the primary use-cases for WebRTC to be browser-to-browser, not browser-legacy.

Just because the charter was mistakenly written that way doesn't mean it is true.

I remind you that the actual title of the group is:

"Real-Time Communication in WEB-browsers (rtcweb)".  While you may disagree with the charter, please remember that it's not fundamentally a prediction about what the eventual balance of flows will be.  It's a statement about where the balance of effort in the group should go.   To me as an individual, it implies that we should not make trade-offs that optimize a non-browser use case at the expense of the browser use case except in pretty extraordinary circumstances.


Adding SDES helps a non-browser use case with no expense to the browser use cases except for the small amount of additional code.

I don't agree, it further complicates the existing hideous mess that is the SDP in the browser. Given where we are, we should be looking for ways to simplify that, not complicate it.

If anyone still thinks that SDP is just a blob not an API surface, take a look at the 'reference implementation' of browser to browser interop.

I count around 100 lines of javascript munging the SDP.

T.
--Apple-Mail=_9DAD43A1-4F0C-4AB4-A395-4D2277F27D58-- From ekr@rtfm.com Fri Apr 26 06:48:56 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DE05821F984B for ; Fri, 26 Apr 2013 06:48:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -99.687 X-Spam-Level: X-Spam-Status: No, score=-99.687 tagged_above=-999 required=5 tests=[AWL=3.289, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2mCJhHLq1Zx7 for ; Fri, 26 Apr 2013 06:48:56 -0700 (PDT) Received: from mail-qe0-f50.google.com (mail-qe0-f50.google.com [209.85.128.50]) by ietfa.amsl.com (Postfix) with ESMTP id BC95221F9852 for ; Fri, 26 Apr 2013 06:48:55 -0700 (PDT) Received: by mail-qe0-f50.google.com with SMTP id k5so1257461qej.37 for ; Fri, 26 Apr 2013 06:48:55 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:x-originating-ip:in-reply-to:references :from:date:message-id:subject:to:cc:content-type:x-gm-message-state; bh=EhGLq7vcFwQzXzIvE1coktbq9pNgiy3ubP1dJNKPZW4=; b=TJ2PSG0wW9xJ1r2CiMIDr9bX2yOfd5ShiWFY6NbpgqEMeCtZE1jB5Y3OysuaLYNIkO YGvtQZlcFVWp5vl3d3/yZOSlMP8hih2WV7zUvofRrBd9lbAUSYr9hLaSk2YzxUSzounh U/NE5rnmWeW4qpvWsDPzsmvx+0OIbsOZ0FzlnVYGiEyid/vIuyyQNUaCmhCLfgeNyYPe HMD8r8NWd+OLf4zTutPqw9Rsb6YiIjZVjPBLLHbKvAyePo/e2UaFUi5rp3NoOOnpJ5nT lcT7A2kcGr2EOQGyF9nqo6ciEPZmX0qnta7kVF7r2qWF+98fiDyih9X3Qhh+D/NSJXm9 RBKw== X-Received: by 10.229.150.199 with SMTP id z7mr1710290qcv.25.1366984135185; Fri, 26 Apr 2013 06:48:55 -0700 (PDT) MIME-Version: 1.0 Received: by 10.49.17.66 with HTTP; Fri, 26 Apr 2013 06:48:14 -0700 (PDT) X-Originating-IP: [203.69.99.17] In-Reply-To: <517A8063.6040908@matthew.at> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <517A00AE.2090804@matthew.at> <517A8063.6040908@matthew.at> From: Eric Rescorla Date: Fri, 26 Apr 2013 06:48:14 -0700 Message-ID: To: Matthew Kaufman Content-Type: multipart/alternative; boundary=e89a8f6469dfcaaa0304db43cb25 X-Gm-Message-State: ALoCoQlRVgxb1AJI+Zxe/IkRwSTXKT3gqVByjLyQhC8C3k4f57WuFZxdtNxxVS5UoxYtBRcFRZO1 Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 13:48:57 -0000 --e89a8f6469dfcaaa0304db43cb25 Content-Type: text/plain; charset=ISO-8859-1 On Fri, Apr 26, 2013 at 6:25 AM, Matthew Kaufman wrote: > On 4/25/2013 11:08 PM, Eric Rescorla wrote: > > > > On Thu, Apr 25, 2013 at 9:21 PM, Matthew Kaufman wrote: > >> On 4/25/2013 4:19 PM, Eric Rescorla wrote: >> >>> >>> It's certainly true that the site has access to the media with DTLS if >>> you >>> don't use identity assertions/isolated streams. However, what it doesn't >>> have is *invisible* access. I.e., it must do something that is user >>> visible, >>> which allows for the detection of cheating by the site. By contrast, if >>> SDES is used >>> then the site can simply passively monitor all your traffic, or at least >>> any that goes through its network and you can't detect it. >>> >>> >> That really depends on what you mean by "user visible" doesn't it? If >> you mean "the user is watching to see that all their packets go to what >> they know is the verified IP address of their buddy" then sure. But if you >> mean "the user is looking at their web browser user interface" or even "the >> user was worried mid-call so checked to see where the packets were going" >> then I think not, as all that needs to happen is for the call to be set up >> with a middlebox in the path that the site claims is necessary for the call >> to work (meets the UI test), keys set with EKT, and then a little ICE >> renegotiation and the middlebox goes away from the path (meets even the >> second test). > > > What I mean is that you can use fingerprint checks (admittedly > inconvenient) to > detect active attacks. Obviously, current browser UIs don't support that, > but > I expect them to eventually. > > > Unless you are in a Hangouts-like scenario, where every call goes to a > mixer and so the fingerprints for all calls look the same, whether you're > being intercepted or not. > Of course. However, if you want to have a call where you know you are secure from monitoring by the site, you avoid such scenarios. -Ekr --e89a8f6469dfcaaa0304db43cb25 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Fri, Apr 26, 2013 at 6:25 AM, Matthew Kaufman <matthew@matthew.at&= gt; wrote:
=20 =20 =20
On 4/25/2013 11:08 PM, Eric Rescorla wrote:


On Thu, Apr 25, 2013 at 9:21 PM, Matthew Kaufman <matthew@matthew.at> wrote:
On 4/25/2013 4:19 PM, Eric Rescorla wrote:

It's certainly true that the site has access to the media with DTLS if you
don't use identity assertions/isolated streams. However, what it doesn't
have is *invisible* access. I.e., it must do something that is user visible,
which allows for the detection of cheating by the site. By contrast, if SDES is used
then the site can simply passively monitor all your traffic, or at least
any that goes through its network and you can't detect it= .


That really depends on what you mean by "user visible" = doesn't it? If you mean "the user is watching to see that all their packets go to what they know is the verified IP address of their buddy" then sure. But if you mean "the user is lo= oking at their web browser user interface" or even "the user = was worried mid-call so checked to see where the packets were going" then I think not, as all that needs to happen is for the call to be set up with a middlebox in the path that the site claims is necessary for the call to work (meets the UI test), keys set with EKT, and then a little ICE renegotiation and the middlebox goes away from the path (meets even the second test).

What I mean is that you can use fingerprint checks (admittedly inconvenient) to
detect active attacks. Obviously, current browser UIs don'= t support that, but
I expect them to eventually.


Unless you are in a Hangouts-like scenario, where every call goes to a mixer and so the fingerprints for all calls look the same, whether you're being intercepted or not.

<= div>Of course. However, if you want to have a call where you know you are
secure from monitoring by the site, you avoid such scenarios.

-Ekr
=A0
--e89a8f6469dfcaaa0304db43cb25-- From dwing@cisco.com Fri Apr 26 06:53:18 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 29EBA21F9727 for ; Fri, 26 Apr 2013 06:53:17 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.166 X-Spam-Level: X-Spam-Status: No, score=-110.166 tagged_above=-999 required=5 tests=[AWL=0.433, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id iGgu+L4-VA1b for ; Fri, 26 Apr 2013 06:53:16 -0700 (PDT) Received: from mtv-iport-2.cisco.com (mtv-iport-2.cisco.com [173.36.130.13]) by ietfa.amsl.com (Postfix) with ESMTP id 9821521F9937 for ; Fri, 26 Apr 2013 06:53:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1219; q=dns/txt; s=iport; t=1366984391; x=1368193991; h=mime-version:subject:from:in-reply-to:date:cc: content-transfer-encoding:message-id:references:to; bh=qb1f6BSqVaL6gxeLeZk6OFYLO1eQqmrKmja3/gWx97c=; b=Aidn4hgBff3vQKjlGj+z3EuAFUgOHScyCKHgfFeKX06qbxN1fGAdryMl 019XyJsE+k2KLPqG/R/urL4M4DnFk3PxK6bUjaX4Qx9K5A18WyxlSM1/C 52NsdKZPYrjtKqi2STTeJdz46ZeX6cqaYqJb5Og2+ccO0T2HMcQsxRooh g=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AjsFALaFelGrRDoH/2dsb2JhbABRgwc3vjqBAxZ0gh8BAQEDAXkQCxguVwYTGQKHcwW/D45fMweCbWEDiRKOC4YSixeDLhw X-IronPort-AV: E=Sophos;i="4.87,558,1363132800"; d="scan'208";a="79691353" Received: from mtv-core-2.cisco.com ([171.68.58.7]) by mtv-iport-2.cisco.com with ESMTP; 26 Apr 2013 13:53:09 +0000 Received: from [10.32.240.196] ([10.32.240.196]) by mtv-core-2.cisco.com (8.14.5/8.14.5) with ESMTP id r3QDr8pS010730; Fri, 26 Apr 2013 13:53:08 GMT Content-Type: text/plain; charset=iso-8859-1 Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) From: Dan Wing In-Reply-To: <41A36FC7-9F29-45E6-8B98-4B3AB51094CD@phonefromhere.com> Date: Fri, 26 Apr 2013 06:53:08 -0700 Content-Transfer-Encoding: quoted-printable Message-Id: <8C20A9D9-F696-4658-84C6-407C1F37B948@cisco.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> <91B4F744-2201-4361-A8D8-7D36F47B865C@cisco.com> <95219856-8365-4A7E-BD0B-4EECE8868498@phonefromhere.com> <517A7FF3.9050702@matthew.at> <41A36FC7-9F29-45E6-8B98-4B3AB51094CD@phonefromhere.com> To: Tim Panton X-Mailer: Apple Mail (2.1503) Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 13:53:20 -0000 On Apr 26, 2013, at 6:29 AM, Tim Panton wrote: >=20 > On 26 Apr 2013, at 14:24, Matthew Kaufman wrote: >=20 >> On 4/26/2013 6:16 AM, Tim Panton wrote: >>>=20 >>> On 26 Apr 2013, at 12:37, I=F1aki Baz Castillo wrote: >>>=20 >>>> Such a solution requires a very expensive gateway. Good for vendors = but bad for all the rest. >>>>=20 >>>=20 >>> I don't understand why the DTLS gateway would be so expensive. It is = _exactly_ the same >>> (conceptually) as the ICE processing - you filter off a few UDP = packets from the stream, do some >>> stuff, send replies then once you are happy you punt some dynamic = settings back up to the (s)rtp >>> layer. >>>=20 >>=20 >> The CPU-seconds of cryptography required are markedly different, = especially on low-end processors used by some of the distributed gateway = solutions. >=20 > True, but only at call set-up time, not for the life of the call. I'd = want to see numbers on this before we select to adopt even=20 > more complexity for the sake of a theoretical legacy interop = requirement. Right - only at call setup and only when keys change. The SRTP packets = themselves are not decrypted/encrypted. -d From matthew@matthew.at Fri Apr 26 06:53:24 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0AA3721F9727 for ; Fri, 26 Apr 2013 06:53:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.43 X-Spam-Level: X-Spam-Status: No, score=-1.43 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, HELO_EQ_AT=0.424, HOST_EQ_AT=0.745] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id aB1SvUlykus8 for ; Fri, 26 Apr 2013 06:53:18 -0700 (PDT) Received: from where.matthew.at (where.matthew.at [198.202.199.1]) by ietfa.amsl.com (Postfix) with ESMTP id B976421F98B3 for ; Fri, 26 Apr 2013 06:53:12 -0700 (PDT) Received: from [10.10.155.2] (unknown [10.10.155.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by where.matthew.at (Postfix) with ESMTP id A2EEE230005 for ; Fri, 26 Apr 2013 06:53:12 -0700 (PDT) Message-ID: <517A86CB.5020305@matthew.at> Date: Fri, 26 Apr 2013 06:53:15 -0700 From: Matthew Kaufman User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <5174C8D2.40504@matthew.at> <5177F7EE.1010909@matthew.at> <5179A362.2000309@jesup.org> In-Reply-To: <5179A362.2000309@jesup.org> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 13:53:24 -0000 On 4/25/2013 2:42 PM, Randell Jesup wrote: > On 4/25/2013 5:10 PM, Cullen Jennings (fluffy) wrote: >> So with my co-chair hat on here… >> >> It seems we have been around the need for OPEN several times and have >> come to consensus on it in the past. Can someone please: >> >> 1) summarize the arguments that in the past that lead us to think we >> need OPEN > > The Open message has some important and useful properties: > > 1) It's easier to work with. JS isn't an ideal language for writing > network protocols, especially for non-network-programmers (i.e. a > large portion of the expected developer community). Open makes it > really easy for a developer to get the type of bidirectional stream > them want with little fuss, and in a manner that maps easily to APIs > they're already used to (e.g. WebSockets). In many cases the label > field will avoid the JS programmer having to build their own > mini-protocol to identify their channels (and this is especially > painful for them if it's an unreliable channel). Easier how? The initiating side needs to create their object without the benefit of the contents of an open message. If a JS developer isn't smart enough to set up the channel parameters they want at the initiating end, then there's nothing we can do for them. There's then several ways forward after that, including "the other side does the same thing to create their end" (my preference) and "the parameters are transported using the existing SDP O/A mechanism to the far end" (generally how the WG solves this kind of problem). As far as I can tell, the one useful thing in the OPEN message is the label (as I pointed out in my very first inquiry about why anyone thought it was needed), and yet the label is allowed to be null, so in that case how can it be helpful? > > 2) It makes it possible to have different applications exchange data, > by having an IANA-registered protocol name, like WebSockets (and there > was strong agreement on it's being needed for that at Atlanta.) With > external-negotiation-only, it would be very hard for different apps to > interoperate, since they'd need to agree on negotiation protocols as > well, which are likely to be highly divergent between apps. If we went with "negotiated via the SDP O/A mechanism" then we could go to our favorite SDP-defining WG and have a negotiation protocol that is standardized, so not divergent at all between apps. > > 3) The Open message, being in-channel, reliable and in-order, makes > the issue that was the genesis of this thread (what to do with data > that arrives unexpectedly) simpler. I disagree. It increases the number of possible states... there's cases where the OPEN message arrives but the application doesn't want to be receiving that data, and the cases where the OPEN message doesn't arrive but the application does want the data that is already arriving. Both of those states don't exist if there's no OPEN message. > With Open, only degenerate cases can cause more than a relatively > small amount of data to be buffered. Sure, but those degenerate cases occur many times per day on the real Internet. > With external notification, the external negotiation channel can fail > (or be very slow), or the app can have a bug and fail to install the > negotiated values, leading to larger or unbounded buffering > requirements - or you punt the problem to the application by > delivering the data, but the application is facing the same conundrum > of buffer it or throw it away. > >> 2) sketch out the range of possible solutions to deal with unexpected >> data before the OPEN > > > The issue exists regardless of whether Open is used or external > negotiation (and in fact is much simpler for Open). > > *tl;dr: *I'm ok with any setting of maximum sizes and/or times that > would not adversely impact temporary buffering for normal cases with > Open of unordered channels. This is option C below. I also would be > ok with B, but I realize others may not be. > > Regardless of supporting Open or not, any external negotiation of > dynamic channels must use one of these: > > A) a 2-or-3-way handshake so the sender knows the receiver is ready to > receive the data on the specified channel before sending it, or > > B) unbounded buffering of data if the external negotiation messages > are delayed (again, what we're discussing in this thread), or > > C) bounded buffering of data (bounded by time, size or both), with > data being dropped and the channel closed if the limits are exceeded, or > > D) deliver unexpected data to the application, which will do .... I > don't know what with it. > > For (D), the application will likely drop it on the floor (leading to > hard-to-test-for problems if the channel is later configured by Open > or external negotiation), or buffer it waiting for the channel to open. > > Supporting Open or not has little bearing on these scenarios So if that's true, then why do we need it? > -- and in fact, since Open is in-channel, reliable, and ordered, it > reduces the problem set (when Open is used) to only unordered channels > (in ordered channels Open will always be first). > > Buffering unexpected data on channels (options B or C) is useful. It > means that in the external negotiation case, one side asking for a new > channel to open by some private means doesn't need to wait to start > sending data on that channel. Of course this is different from the TCP model, where the buffering happens at the *sender* until the handshake is complete. The problem here is that we have an existing mechanism inside of SCTP and then we're adding another layer on top of that which is neither inside SCTP (where it probably belongs) or under the application developer's control (where I'd like to see it, if the data transport protocol can't have it), and this layer conflicts with what both of those might be doing. > Note that with external negotiation (possibly on a non p2p path, like > via signaling), the receiver might not know what to install for a > short while, especially if there's a routing issue or server issue > (not a problem that happens with Open). Which is fine if the sender doesn't start sending (like TCP). Or if the transport protocol itself handles the delivery of the channel metadata. (Which is what SCTP, or whatever transport we choose for RTCWEB, should do) then you just handle the label and whatever other metadata the receiver would like to know at that layer. > > Since normal Open cases have very little chance of triggering this > problem (triggering buffering), some arbitrary size limit seems > reasonable (option C). Often in network protocols there are small > buffers (4, 16, 64KB). I prefer a larger value of say 256KB so that > apps using external negotiation can just send largish data immediately > - and note: actually buffering data is still an unlikely occurrence > even in most external negotiation cases. If people want to bikeshed > on the buffersize or timeout, that's fine. ;-) > > Also, external negotiation is the only case where more than a trivial > amount of data can "pile up" in the buffer waiting for the receiving > side to finish it's side of the negotiation (i.e. if your external > negotiation channel fails or the app has a brain fart). > > Another great argument for having this negotiation happen within the transport itself. Matthew Kaufman From matthew@matthew.at Fri Apr 26 06:56:00 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E1A0021F9742 for ; Fri, 26 Apr 2013 06:56:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.429 X-Spam-Level: X-Spam-Status: No, score=-1.429 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HELO_EQ_AT=0.424, HOST_EQ_AT=0.745, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YBOEHncaUAWZ for ; Fri, 26 Apr 2013 06:55:59 -0700 (PDT) Received: from where.matthew.at (where.matthew.at [198.202.199.1]) by ietfa.amsl.com (Postfix) with ESMTP id E319A21F9017 for ; Fri, 26 Apr 2013 06:55:59 -0700 (PDT) Received: from [10.10.155.2] (unknown [10.10.155.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by where.matthew.at (Postfix) with ESMTP id 9767A230005 for ; Fri, 26 Apr 2013 06:55:59 -0700 (PDT) Message-ID: <517A8772.4090906@matthew.at> Date: Fri, 26 Apr 2013 06:56:02 -0700 From: Matthew Kaufman User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <5174C8D2.40504@matthew.at> <5177F7EE.1010909@matthew.at> <517A1102.1010906@alvestrand.no> In-Reply-To: <517A1102.1010906@alvestrand.no> Content-Type: multipart/alternative; boundary="------------050202090408000906040203" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 13:56:01 -0000 This is a multi-part message in MIME format. --------------050202090408000906040203 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit On 4/25/2013 10:30 PM, Harald Alvestrand wrote: > On 04/25/2013 07:28 AM, Matthew Kaufman (SKYPE) wrote: >> >> It is a much simpler question as there's only a couple of options >> left... how about we throw it on the floor? That seems safest to me. >> >> I'd still love to hear why it is "needed" though. >> > > The fact that Matthew doesn't want to accept the arguments for why it > is needed doesn't seem relevant to me. Until Randell's message arrived a few hours before yours, there was no concise summary of why it might be needed. Never mind that your personal view as to whether or not to just ignore my technical arguments offhand because they're sent by me is hardly relevant to the rest of the working group. > > I think people have said enough times that they see value in the label > concept, and they want some way to carry it. The OPEN message is a > simple way to fill that need (and also makes some other aspects of > setup simpler than they would otherwise be). > > And as I pointed out in my original message on this topic, which until Randell's message was met with silence, the only thing that made sense to me was the label field, and yet the label can be null, so might also be useless. Matthew Kaufman --------------050202090408000906040203 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
On 4/25/2013 10:30 PM, Harald Alvestrand wrote:
On 04/25/2013 07:28 AM, Matthew Kaufman (SKYPE) wrote:

It is a much simpler question as there’s only a couple of options left… how about we throw it on the floor? That seems safest to me.

 

I’d still love to hear why it is “needed” though.


The fact that Matthew doesn't want to accept the arguments for why it is needed doesn't seem relevant to me.

Until Randell's message arrived a few hours before yours, there was no concise summary of why it might be needed.

Never mind that your personal view as to whether or not to just ignore my technical arguments offhand because they're sent by me is hardly relevant to the rest of the working group.


I think people have said enough times that they see value in the label concept, and they want some way to carry it. The OPEN message is a simple way to fill that need (and also makes some other aspects of setup simpler than they would otherwise be).



And as I pointed out in my original message on this topic, which until Randell's message was met with silence, the only thing that made sense to me was the label field, and yet the label can be null, so might also be useless.

Matthew Kaufman

--------------050202090408000906040203-- From dwing@cisco.com Fri Apr 26 06:57:00 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BD31421F993A for ; Fri, 26 Apr 2013 06:57:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.274 X-Spam-Level: X-Spam-Status: No, score=-110.274 tagged_above=-999 required=5 tests=[AWL=0.325, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id b0Zr2N6Q5h+6 for ; Fri, 26 Apr 2013 06:57:00 -0700 (PDT) Received: from mtv-iport-3.cisco.com (mtv-iport-3.cisco.com [173.36.130.14]) by ietfa.amsl.com (Postfix) with ESMTP id 10AB921F9939 for ; Fri, 26 Apr 2013 06:57:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1592; q=dns/txt; s=iport; t=1366984620; x=1368194220; h=mime-version:subject:from:in-reply-to:date:cc: content-transfer-encoding:message-id:references:to; bh=kwIG67GP3RleW2OFU1FEKJpqo80Qs9F0cRXLCH4KZbI=; b=nBj4rIScGyJUlwwo3L/H5bKkLb6cvbXrTpeHN5cGbbFob/x1jQp78dXl yhioRzaEaC/l1g+LJVu91sdM3eVPnNuxfowMcK91tzsxQJzemg85ZD64d RvQCpSViFEPv+emEHYrx7hzUXTy7M7G6hhquoNYeHwZkYQlyrW6atNZ1Q 8=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AjwFAE6GelGrRDoH/2dsb2JhbABRgwc2Ab46gQMWdIIfAQEBAgEBAQEBawsFCwsYLicwBhMJEodzBQ2/BI5fMweCbWEDiRKOC4YSixeDLhw X-IronPort-AV: E=Sophos;i="4.87,559,1363132800"; d="scan'208";a="77116577" Received: from mtv-core-2.cisco.com ([171.68.58.7]) by mtv-iport-3.cisco.com with ESMTP; 26 Apr 2013 13:56:58 +0000 Received: from [10.32.240.196] ([10.32.240.196]) by mtv-core-2.cisco.com (8.14.5/8.14.5) with ESMTP id r3QDuv3A013005; Fri, 26 Apr 2013 13:56:57 GMT Content-Type: text/plain; charset=iso-8859-1 Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) From: Dan Wing In-Reply-To: <517A820F.9050807@alvestrand.no> Date: Fri, 26 Apr 2013 06:56:57 -0700 Content-Transfer-Encoding: quoted-printable Message-Id: <22E6A779-1573-4EDE-82D6-B1A831CE4833@cisco.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> <91B4F744-2201-4361-A8D8-7D36F47B865C@cisco.com> <95219856-8365-4A7E-BD0B-4EECE8868498@phonefromhere.com> <517A820F.9050807@alvestrand.no> To: Harald Alvestrand X-Mailer: Apple Mail (2.1503) Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 13:57:00 -0000 On Apr 26, 2013, at 6:33 AM, Harald Alvestrand = wrote: > On 04/26/2013 03:16 PM, Tim Panton wrote: >>=20 >> On 26 Apr 2013, at 12:37, I=F1aki Baz Castillo wrote: >>=20 >>> Such a solution requires a very expensive gateway. Good for vendors = but bad for all the rest. >>>=20 >>=20 >> I don't understand why the DTLS gateway would be so expensive. It is = _exactly_ the same >> (conceptually) as the ICE processing - you filter off a few UDP = packets from the stream, do some >> stuff, send replies then once you are happy you punt some dynamic = settings back up to the (s)rtp >> layer. >=20 > So you're saying that the gateway doesn't have to decrypt and = re-encrypt the packets? Correct - the gateway does not have to decrypt and re-encrypt the SRTP = packets. The gateway only has to interwork the signaling between SDES = and DTLS-SRTP-EKT. Such signaling interworking is necessary when the = call is initially set up and when the SRTP key is changed (e.g., a new = person joins a call using their own key, or the SRTP key is exhausted = [pretty unlikely, even with video]). This was summarized in = http://www.ietf.org/proceedings/83/slides/slides-83-rtcweb-3.pdf >=20 > I think EKT may be a problem, as Inaki pointed out, but I have less = qualms about supporting DTLS and making it optional to use EKT on some = calls than I have about mandating support for SDES. -d > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From ibc@aliax.net Fri Apr 26 07:02:18 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D622521F9975 for ; Fri, 26 Apr 2013 07:02:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.426 X-Spam-Level: X-Spam-Status: No, score=-2.426 tagged_above=-999 required=5 tests=[AWL=0.250, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BEJIxhGKNkZy for ; Fri, 26 Apr 2013 07:02:18 -0700 (PDT) Received: from mail-qe0-f53.google.com (mail-qe0-f53.google.com [209.85.128.53]) by ietfa.amsl.com (Postfix) with ESMTP id 5104221F9955 for ; Fri, 26 Apr 2013 07:02:18 -0700 (PDT) Received: by mail-qe0-f53.google.com with SMTP id i11so2792208qej.12 for ; Fri, 26 Apr 2013 07:02:17 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type:x-gm-message-state; bh=0uaD/1IIJiDFDH0oaxYWjrzQhW4walXTGSLNusv0OCc=; b=dRv7oOU5htdRiEH6J9i00RqaBp14FpbqQK6i861BYdp2MND/a7sC+N9uFsuVBT/JAn MJaPJkOHPZmB/7xu41W2y5mxDPYm4nGfPAdxZBh6K4MNOZN/6LimHO8zRbNoMiqM1WcK AiOwIQhO8e8q2my9b8F+kFKvwXqgMeTwU41wnVsU41oO1rZMTPJWAoC+Ajw0oaEGoffS Y/MI1yrK3l26llXFW5Glthbs+zi6lz7rXj5FXBLPXgAhvwlKwayKXIL1oGIn9c8Oe80e sHfHNNpsfEO7qr8q6275eipE9CpURM1FvqRVORZdxqsQJpytdEK3j3cWaQ9MK4V16w1h 5KTg== MIME-Version: 1.0 X-Received: by 10.224.184.204 with SMTP id cl12mr40712545qab.0.1366984937440; Fri, 26 Apr 2013 07:02:17 -0700 (PDT) Received: by 10.49.81.175 with HTTP; Fri, 26 Apr 2013 07:02:17 -0700 (PDT) Received: by 10.49.81.175 with HTTP; Fri, 26 Apr 2013 07:02:17 -0700 (PDT) In-Reply-To: <1BF967D4-2EEA-489D-977E-E5D711966753@phonefromhere.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <5179BEEF.4000600@jesup.org> <517A0237.9030008@matthew.at> <517A8248.4020604@matthew.at> <1BF967D4-2EEA-489D-977E-E5D711966753@phonefromhere.com> Date: Fri, 26 Apr 2013 16:02:17 +0200 Message-ID: From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= To: Tim Panton Content-Type: multipart/alternative; boundary=20cf302ef9d89c1c6f04db43fbf7 X-Gm-Message-State: ALoCoQkw+DYgqvlpRj+cLHZZZeqP1qnl1fCBO9KeIos4LOsSjR7BQYAENFzHrQmqgJ4s05WwDh3I Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 14:02:18 -0000 --20cf302ef9d89c1c6f04db43fbf7 Content-Type: text/plain; charset=UTF-8 > If anyone still thinks that SDP is just a blob not an API surface, take a look at the 'reference implementation' of browser to browser interop. > https://code.google.com/p/webrtc-samples/source/browse/trunk/apprtc/index.html > > I count around 100 lines of javascript munging the SDP. IMHO the WG should really consider the above mess due to the usage of SDP as an API surface. It is just terrible. --20cf302ef9d89c1c6f04db43fbf7 Content-Type: text/html; charset=UTF-8


> If anyone still thinks that SDP is just a blob not an API surface, take a look at the 'reference implementation' of browser to browser interop.
> https://code.google.com/p/webrtc-samples/source/browse/trunk/apprtc/index.html
>
> I count around 100 lines of javascript munging the SDP.

IMHO the WG should really consider the above mess due to the usage of SDP as an API surface. It is just terrible.

--20cf302ef9d89c1c6f04db43fbf7-- From oscar.ohlsson@ericsson.com Fri Apr 26 07:56:55 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 705B121F98D0 for ; Fri, 26 Apr 2013 07:56:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.249 X-Spam-Level: X-Spam-Status: No, score=-6.249 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Rq0OfuoUiqiQ for ; Fri, 26 Apr 2013 07:56:50 -0700 (PDT) Received: from mailgw2.ericsson.se (mailgw2.ericsson.se [193.180.251.37]) by ietfa.amsl.com (Postfix) with ESMTP id D72AF21F990A for ; Fri, 26 Apr 2013 07:56:49 -0700 (PDT) X-AuditID: c1b4fb25-b7f366d000004d10-7d-517a95b002a7 Received: from ESESSHC019.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw2.ericsson.se (Symantec Mail Security) with SMTP id 1D.AF.19728.0B59A715; Fri, 26 Apr 2013 16:56:48 +0200 (CEST) Received: from ESESSMB301.ericsson.se ([169.254.1.55]) by ESESSHC019.ericsson.se ([153.88.183.75]) with mapi id 14.02.0328.009; Fri, 26 Apr 2013 16:56:48 +0200 From: Oscar Ohlsson To: "rtcweb@ietf.org" Thread-Topic: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb Thread-Index: AQHOQc2dwZWfSQxvq02XfTweGt/ed5jnP5SAgAACAICAABhyAIAAp5GAgAAPRICAAHQt4A== Date: Fri, 26 Apr 2013 14:56:47 +0000 Message-ID: References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> <9F33F40F6F2CD847824537F3C4E37DDF0E6C04AF@MCHP04MSX.global-ad.net> In-Reply-To: Accept-Language: sv-SE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [153.88.183.16] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrOLMWRmVeSWpSXmKPExsUyM+Jvre6GqVWBBtdf2Vis/dfO7sDosWTJ T6YAxigum5TUnMyy1CJ9uwSujAknr7IWfJav+H4ms4Hxg2QXIyeHhICJxN5nKxghbDGJC/fW s3UxcnEICRxmlDj98x8LhLOYUWLlj31sIFVsAgYSt+6fZAGxRQTUJS4/vMAOYgsLuEr0fv3J DhF3k2je1MIMYYdJTN12DKyeRUBVYv7dq6wgNq+At8SLB83MEAvmMUvcn9sPdganQKDEtDMT wJYxCshK3P9+D6yZWUBc4taT+UwQpwpILNlznhnCFpV4+fgfK4StKLHzbDszRL2exI2pU9gg bG2JZQtfM0MsFpQ4OfMJywRG0VlIxs5C0jILScssJC0LGFlWMbLnJmbmpJcbbWIEBv7BLb9V dzDeOSdyiFGag0VJnHeGVGWgkEB6YklqdmpqQWpRfFFpTmrxIUYmDk6pBsZp0wtLDes+L5dr 9tti/27L2wmzWCvOXoyZY5gwJUP9IVOJK8ts2exz3E0BXXGn5nef2bIlw9xFsqPxCVvRzZIf l2RXiPRNc8rnrf788MmE1R1/Kjnkzm22c0l/8q8hN//xbq0JWtNctkoe2R7LyZGefG0pe+Gu ozKGSpIJ+5u33y6J9jnpJqLEUpyRaKjFXFScCADlSHUtSgIAAA== Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 14:56:55 -0000 I'm also in favour of supporting SDES (no big surprise). But we need to ana= lyze how SDES should be enabled and how it can be negotiated in SDP. If peo= ple are concerned with bidding down attacks then we could add a separate Ja= vaScript instruction for enabling SDES. If SDES is not enabled then it woul= dn't be offered or accepted. Regards, Oscar From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of= Xavier Marjou Sent: den 26 april 2013 10:50 To: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb +1 for supporting SDES as a=A0keying method for WebRTC Cheers, Xavier On Fri, Apr 26, 2013 at 9:55 AM, Hutton, Andrew wrote: Also agree that we should support SDES in additional to DTLS-SRTP. Regards Andy > -----Original Message----- > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > Behalf Of Ejzak, Richard P (Richard) > Sent: 25 April 2013 22:55 > To: rtcweb@ietf.org > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > I also agree that we should support SDES in addition to DTLS-SRTP. > > This raises a further question about SCTP/DTLS for DataChannels. =A0It > seems that if we support SDES-SRTP, don't we also need to provide an > SDES keying mechanism for DataChannels? =A0Ekr: What is needed to realize > this? > > Richard Ejzak > > > -----Original Message----- > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > Behalf Of Matthew Kaufman (SKYPE) > > Sent: Thursday, April 25, 2013 3:28 PM > > To: Bogineni, Kalyani; 'Cullen Jennings'; rtcweb@ietf.org > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > I agree. The ability to set the cipher suite and keys from JavaScript > > is critical for certain applications. SDES is the best we'll get with > > SDP as the API. DTLS-SRTP-only would be unacceptably limiting. > > > > Matthew Kaufman > > > > > -----Original Message----- > > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > > Behalf Of Bogineni, Kalyani > > > Sent: Thursday, April 25, 2013 1:21 PM > > > To: 'Cullen Jennings'; rtcweb@ietf.org > > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and > RTCWeb > > > > > > We would like to support the use of SDES as a keying method for > > WebRTC. > > > > > > Kalyani Bogineni > > > Verizon > > > > > > -----Original Message----- > > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > > Behalf Of Cullen Jennings > > > Sent: Thursday, April 25, 2013 11:57 AM > > > To: rtcweb@ietf.org > > > Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > > > > > > The working groups committed some time ago to have a further > > > discussion on whether SDP Security Descriptions (RFC 4568 aka SDES) > > > would be usable as a keying method for WebRTC. =A0As we prepare for > > that > > > discussion, we'd like to have expressions of interest or support > for > > > that approach which indicate the general outlines of support > > proposed. > > > If you wish to make such an expression of support, please send it > to > > the chairs or the list. > > > > > > Cullen, Magnus, & Ted > > > > > > > > > _______________________________________________ > > > rtcweb mailing list > > > rtcweb@ietf.org > > > https://www.ietf.org/mailman/listinfo/rtcweb > > > _______________________________________________ > > > rtcweb mailing list > > > rtcweb@ietf.org > > > https://www.ietf.org/mailman/listinfo/rtcweb > > > > _______________________________________________ > > rtcweb mailing list > > rtcweb@ietf.org > > https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb _______________________________________________ rtcweb mailing list rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb From fluffy@iii.ca Fri Apr 26 07:58:45 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AEAF921F97D3 for ; Fri, 26 Apr 2013 07:58:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id i1AgJPAPRrtm for ; Fri, 26 Apr 2013 07:58:45 -0700 (PDT) Received: from mxout-07.mxes.net (mxout-07.mxes.net [216.86.168.182]) by ietfa.amsl.com (Postfix) with ESMTP id 1606321F97D1 for ; Fri, 26 Apr 2013 07:58:45 -0700 (PDT) Received: from [192.168.4.100] (unknown [128.107.239.233]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by smtp.mxes.net (Postfix) with ESMTPSA id 433BB22E253; Fri, 26 Apr 2013 10:58:37 -0400 (EDT) Content-Type: text/plain; charset=iso-8859-1 Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) From: Cullen Jennings In-Reply-To: <517A0E5C.6010505@alvestrand.no> Date: Fri, 26 Apr 2013 08:58:36 -0600 Content-Transfer-Encoding: quoted-printable Message-Id: <3523D45E-8724-4CE4-BDAD-68F738D9A130@iii.ca> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <517A0E5C.6010505@alvestrand.no> To: Harald Alvestrand X-Mailer: Apple Mail (2.1503) Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 14:58:45 -0000 Uh, rereading that paragraph, the word "support" got used a lot of times = - my apologies.=20 We had previously deferred the WG discussion about SDP Security = Descriptions but we would like to try and resolve that issue. What we = are asking for is for people to suggest what they want the drafts to say = on this topic and why. Exactly the sort of discussion we have seen from = the people that replied to this thread was the type of thing we where = hoping for.=20 Answers inline below ... On Apr 25, 2013, at 11:19 PM, Harald Alvestrand = wrote: > On 04/25/2013 05:57 PM, Cullen Jennings wrote: >> The working groups committed some time ago to have a further = discussion on whether SDP Security Descriptions (RFC 4568 aka SDES) = would be usable as a keying method for WebRTC. As we prepare for that = discussion, we'd like to have expressions of interest or support for = that approach which indicate the general outlines of support proposed. = If you wish to make such an expression of support, please send it to the = chairs or the list. >=20 > Sorry, I got lost in the levels of support. >=20 > Are you asking for indications of support for the idea of supporting = SDES (in which case you should also be asking for indications of support = for the idea of NOT supporting SDES), yes, glad to hear about both of these. I'd view "MUST NOT ever do SDES = or even talk about. If you receive SDP with SDES in in the browser MUST = reformat the hard drive and send a report to the EFF" as one level of = "support" we could choose. (OK not one I would support but you get the = idea) =20 > or are you asking for indications of support for the idea of having a = discussion about supporting SDES? No, we did not mean to ask that, we were just presumptively starting the = discussion. If no one wants to talk about it I assumed there would be = silence on the list or push back on that. It's currently listed as an = open issues in the WG draft.=20 >=20 > Harald >=20 From suhasietf@gmail.com Fri Apr 26 09:36:16 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5CC1E21F9A5A for ; Fri, 26 Apr 2013 09:36:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TUnvq0DiS1pe for ; Fri, 26 Apr 2013 09:36:15 -0700 (PDT) Received: from mail-wi0-x22f.google.com (mail-wi0-x22f.google.com [IPv6:2a00:1450:400c:c05::22f]) by ietfa.amsl.com (Postfix) with ESMTP id D3F0221F9A54 for ; Fri, 26 Apr 2013 09:36:14 -0700 (PDT) Received: by mail-wi0-f175.google.com with SMTP id h11so830696wiv.2 for ; Fri, 26 Apr 2013 09:36:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=ej795VgCajfWBEZrOVf8Gm0AyICAuHTmC8FfTkXV70I=; b=rgLQlnsyOtwNV19x2GR30nrFdavDksxO0+eOzY72nZIrPGkC7YKb4Se2z5A5cusOFM 9yGnwCRXKNREausKrtJKZWsPwu10ms3OPxpBL3KDx07ygt3kfkvsBs2x84jlH40Dt2a5 amEgmCdrg+ybUmB9JgKZVLnWmzT9cyimk43N3GKjWKezA7S19hAtuhxxBbgbPOIzgwUA i23wkCrmM1mTICPiUDU4XlTiTm7Or4z8ODAM6wx7DuqMoT9Ea4dwrGimfsMERVFTkWvL ucMOYNf6QkBHlSP2qsCZawE8+PjT5YpQ79UGJUQUvBR4/nMft71VtAZOsb88hfNmeIl+ vP9A== MIME-Version: 1.0 X-Received: by 10.180.85.103 with SMTP id g7mr5169047wiz.23.1366994173948; Fri, 26 Apr 2013 09:36:13 -0700 (PDT) Received: by 10.194.139.79 with HTTP; Fri, 26 Apr 2013 09:36:13 -0700 (PDT) In-Reply-To: References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> Date: Fri, 26 Apr 2013 09:36:13 -0700 Message-ID: From: Suhas Nandakumar To: Tim Panton Content-Type: multipart/alternative; boundary=f46d043bdce62770f104db462265 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 16:36:16 -0000 --f46d043bdce62770f104db462265 Content-Type: text/plain; charset=ISO-8859-1 Tim, I disagree with the argument on the interop that a media gateway is always required. Cisco for example have been shipping devices that work fine with webrtc browsers that do H.264 without needing a media gateway. I am sure this is true for examples other than Cisco. Thanks Suhas Nandakumar On Fri, Apr 26, 2013 at 4:11 AM, Tim Panton wrote: > > On 26 Apr 2013, at 00:01, Martin Thomson wrote: > > > The case for SDES has thus far been summarized as (borrowing Adam's > words): > > > > (1) Those required for interop with legacy devices, and > > (2) those which we are prohibited by RFC 2804 from considering. > > > > Reason (1) is a fairly big deal. There are other reasons: > > I don't buy the interop argument. > There are (as we have all now discovered) no legacy devices that do SRTP > (SDES only) and Ice/STUN/rtcp-mux/bundle > as required to consume the UDP that chrome (for example) generates. We > will _always_ need a media gateway in front of > any current legacy devices to de-ice/de-mux/ etc the media streams from > webRTC. > > (Note: I refuse to take into account the oxymoronic 'future legacy' > devices that current legacy providers may build at some point in the > future). > > So the question is how heavy does that media gateway have to be? > Does adding DTLS as a key exchange method make they exorbitant to build? > It turns out that it doesn't. > > Remembering that DTLS is only used here as a key-exchange > protocol you can just put a DTLS filter in your UDP layer (alongside the > ICE /demux code) and pop the SRTP keys out of it. > Those keys can then be used by current SRTP hardware and software. > > So the overhead is limited to the key-exchange itself. It will make call > set-up mor expensive, but as someone pointed out there are > a few websites that seem to cope with https - so I dare say we will learn > to live with it. > > Tim. > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > --f46d043bdce62770f104db462265 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Tim,=A0
=
=A0 = =A0I disagree with the argument on the interop that =A0a media gateway is a= lways required. Cisco for example have been shipping devices that work fine= with webrtc browsers that do H.264 without needing a media gateway. I am s= ure this is true for examples other than Cisco.

Thanks
Suhas Nandakumar


On Fri, Apr 2= 6, 2013 at 4:11 AM, Tim Panton <tim@phonefromhere.com> w= rote:

On 26 Apr 2013, at 00:01, Martin Thomson wrote:

> The case for SDES has thus far been summarized as (borrowing Adam'= s words):
>
> (1) Those required for interop with legacy devices, and
> (2) those which we are prohibited by RFC 2804 from considering.
>
> Reason (1) is a fairly big deal. =A0There are other reasons:

I don't buy the interop argument.
There are (as we have all now discovered) no legacy devices that do SRTP (S= DES only) and Ice/STUN/rtcp-mux/bundle
as required to consume the UDP that chrome (for example) generates. We will= _always_ need a media gateway in front of
any current legacy devices to de-ice/de-mux/ etc the media streams from web= RTC.

(Note: I refuse to take into account the oxymoronic 'future legacy'= devices that current legacy providers may build at some point in the futur= e).

So the question is how heavy does that media gateway have to be?
Does adding DTLS as a key exchange method make they exorbitant to build? It turns out that it doesn't.

Remembering that DTLS is only used here as a key-exchange
protocol you can just put a DTLS filter in your UDP layer (alongside the IC= E /demux code) and pop the SRTP keys out of it.
Those keys can then be used by current SRTP hardware and software.

So the overhead is limited to the key-exchange itself. It will make call se= t-up mor expensive, but as someone pointed out there are
a few websites that seem to cope with https - so I dare say we will learn t= o live with it.

Tim.
_____________________= __________________________
rtcweb mailing list
rtcweb@ietf.org
= https://www.ietf.org/mailman/listinfo/rtcweb

--f46d043bdce62770f104db462265-- From ibc@aliax.net Fri Apr 26 09:41:43 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DD86021F9A6E for ; Fri, 26 Apr 2013 09:41:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.51 X-Spam-Level: X-Spam-Status: No, score=-2.51 tagged_above=-999 required=5 tests=[AWL=0.167, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GnOTx7+QSsgR for ; Fri, 26 Apr 2013 09:41:43 -0700 (PDT) Received: from mail-qe0-f41.google.com (mail-qe0-f41.google.com [209.85.128.41]) by ietfa.amsl.com (Postfix) with ESMTP id F296F21F9A6D for ; Fri, 26 Apr 2013 09:41:42 -0700 (PDT) Received: by mail-qe0-f41.google.com with SMTP id b4so2927934qen.28 for ; Fri, 26 Apr 2013 09:41:39 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type:x-gm-message-state; bh=QISDdG5QgwkDG+g4iKF6SBnp1zQqfCHoYszAPx1Thgs=; b=d0JcQdI7bplMXm1Ra1AK3DwZODsAciHz9jog1DgMDKfof7jldQtwzBde3ya6mpjTq9 flrU9dzJHG/UvZhFkEuzgimCqMkp1mnVRUO9R8sbO6dqswkY6suSgrrPEUw1zIjTqxAA vg3Iecl33+pefVhVVj8gzDpxSGAC6xF1zUa1BYDNMAcDX3sNI7spBiq9U1vSUNK2vMlJ SptDMiN5tF/cC2AC9GeqW4dVdYkeAYs4k8gA/PenRdL4+OKAF4bEqnYbRpnyeso4sTo7 0/oTdc4C/VoLBYQDSLJWyL/vIWHKTPDg7b1mmRl6+2qP7seeFU21DJ2g0LGUQqKOyzPu STQw== MIME-Version: 1.0 X-Received: by 10.49.71.165 with SMTP id w5mr5808544qeu.36.1366994498669; Fri, 26 Apr 2013 09:41:38 -0700 (PDT) Received: by 10.49.81.175 with HTTP; Fri, 26 Apr 2013 09:41:38 -0700 (PDT) Received: by 10.49.81.175 with HTTP; Fri, 26 Apr 2013 09:41:38 -0700 (PDT) In-Reply-To: References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> Date: Fri, 26 Apr 2013 18:41:38 +0200 Message-ID: From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= To: Suhas Nandakumar Content-Type: multipart/alternative; boundary=047d7b5dbdcc80e04304db463536 X-Gm-Message-State: ALoCoQkbYxZSgPUPhfoQl/aI3eGvGjgWR6cuUtvo7AI1572LXeA5zu9txBo5UQILgz0yL9fK2uUK Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 16:41:44 -0000 --047d7b5dbdcc80e04304db463536 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable And is it so hard for Cisco to make those new WebRTC capable devices DTLS aware? Is that really harder than the ICE/bundle/SAVPF stuff already implemented in those devices? -- I=C3=B1aki Baz Castillo El 26/04/2013 18:36, "Suhas Nandakumar" escribi=C3=B3= : > Tim, > > I disagree with the argument on the interop that a media gateway is > always required. Cisco for example have been shipping devices that work > fine with webrtc browsers that do H.264 without needing a media gateway. = I > am sure this is true for examples other than Cisco. > > Thanks > Suhas Nandakumar > > > On Fri, Apr 26, 2013 at 4:11 AM, Tim Panton wrote= : > >> >> On 26 Apr 2013, at 00:01, Martin Thomson wrote: >> >> > The case for SDES has thus far been summarized as (borrowing Adam's >> words): >> > >> > (1) Those required for interop with legacy devices, and >> > (2) those which we are prohibited by RFC 2804 from considering. >> > >> > Reason (1) is a fairly big deal. There are other reasons: >> >> I don't buy the interop argument. >> There are (as we have all now discovered) no legacy devices that do SRTP >> (SDES only) and Ice/STUN/rtcp-mux/bundle >> as required to consume the UDP that chrome (for example) generates. We >> will _always_ need a media gateway in front of >> any current legacy devices to de-ice/de-mux/ etc the media streams from >> webRTC. >> >> (Note: I refuse to take into account the oxymoronic 'future legacy' >> devices that current legacy providers may build at some point in the >> future). >> >> So the question is how heavy does that media gateway have to be? >> Does adding DTLS as a key exchange method make they exorbitant to build? >> It turns out that it doesn't. >> >> Remembering that DTLS is only used here as a key-exchange >> protocol you can just put a DTLS filter in your UDP layer (alongside the >> ICE /demux code) and pop the SRTP keys out of it. >> Those keys can then be used by current SRTP hardware and software. >> >> So the overhead is limited to the key-exchange itself. It will make call >> set-up mor expensive, but as someone pointed out there are >> a few websites that seem to cope with https - so I dare say we will lear= n >> to live with it. >> >> Tim. >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb >> > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > > --047d7b5dbdcc80e04304db463536 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

And is it so hard for Cisco to make those new WebRTC capable= devices DTLS aware? Is that really harder than the ICE/bundle/SAVPF stuff = already implemented in those devices?

--
I=C3=B1aki Baz Castillo
<ibc@aliax.net>

El 26/04/2013 18:36, "Suhas Nandakumar"= ; <suhasietf@gmail.com> es= cribi=C3=B3:
Tim,=C2=A0

=C2= =A0 =C2=A0I disagree with the argument on the interop that =C2=A0a media ga= teway is always required. Cisco for example have been shipping devices that= work fine with webrtc browsers that do H.264 without needing a media gatew= ay. I am sure this is true for examples other than Cisco.

Thanks
Suhas Nandakumar


On Fri, Apr 2= 6, 2013 at 4:11 AM, Tim Panton <tim@phonefromhere.com> w= rote:

On 26 Apr 2013, at 00:01, Martin Thomson wrote:

> The case for SDES has thus far been summarized as (borrowing Adam'= s words):
>
> (1) Those required for interop with legacy devices, and
> (2) those which we are prohibited by RFC 2804 from considering.
>
> Reason (1) is a fairly big deal. =C2=A0There are other reasons:

I don't buy the interop argument.
There are (as we have all now discovered) no legacy devices that do SRTP (S= DES only) and Ice/STUN/rtcp-mux/bundle
as required to consume the UDP that chrome (for example) generates. We will= _always_ need a media gateway in front of
any current legacy devices to de-ice/de-mux/ etc the media streams from web= RTC.

(Note: I refuse to take into account the oxymoronic 'future legacy'= devices that current legacy providers may build at some point in the futur= e).

So the question is how heavy does that media gateway have to be?
Does adding DTLS as a key exchange method make they exorbitant to build? It turns out that it doesn't.

Remembering that DTLS is only used here as a key-exchange
protocol you can just put a DTLS filter in your UDP layer (alongside the IC= E /demux code) and pop the SRTP keys out of it.
Those keys can then be used by current SRTP hardware and software.

So the overhead is limited to the key-exchange itself. It will make call se= t-up mor expensive, but as someone pointed out there are
a few websites that seem to cope with https - so I dare say we will learn t= o live with it.

Tim.
_______________________________________________
rtcweb mailing list
rtcweb@ietf.org = https://www.ietf.org/mailman/listinfo/rtcweb


_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
= https://www.ietf.org/mailman/listinfo/rtcweb

--047d7b5dbdcc80e04304db463536-- From alan.b.johnston@gmail.com Fri Apr 26 09:53:40 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E7D0F21F9927 for ; Fri, 26 Apr 2013 09:53:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -100.933 X-Spam-Level: X-Spam-Status: No, score=-100.933 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001, SARE_HTML_USL_OBFU=1.666, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4qULIVZ5tA+L for ; Fri, 26 Apr 2013 09:53:37 -0700 (PDT) Received: from mail-wg0-x22e.google.com (mail-wg0-x22e.google.com [IPv6:2a00:1450:400c:c00::22e]) by ietfa.amsl.com (Postfix) with ESMTP id 0E67E21F991F for ; Fri, 26 Apr 2013 09:53:31 -0700 (PDT) Received: by mail-wg0-f46.google.com with SMTP id e11so2247470wgh.13 for ; Fri, 26 Apr 2013 09:53:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=mE4Zqlmh9YgdFZt9sSfsppHhbzvdZqgIDT0OG4p4w38=; b=aW/+7aEp0YH4wxi4aqiSsKJVkz1Zru5moSWvAheGEsHFjTB/kFSd61+JQYqtJt4cOH gJEqRzyGKp0tOBAbrGqk3/enHsp7Czg7DVpn8fVVja0O92GJlj6TPNI50QyG4lHqBk/r N1kF+xd28rN2HBv1BZMZaxxdmsijPcklUk65MIk0s/uqX0BDUSvOWipG3usSaIcKBeHx 2tzaONvvwFsiOPkCuEI1+Vw/bohpUOxz03OSr7eds62+r87znst6BYjCivL2wckrYSYl GjWWb96lZXWCaw8cASceYYskJPmGb1oRotX7auU9d9KZr77HU4GrF1GQ01BMVf2mwmUv g0eg== MIME-Version: 1.0 X-Received: by 10.194.122.7 with SMTP id lo7mr61588500wjb.48.1366995211222; Fri, 26 Apr 2013 09:53:31 -0700 (PDT) Received: by 10.216.173.134 with HTTP; Fri, 26 Apr 2013 09:53:30 -0700 (PDT) In-Reply-To: <5179AC21.5060708@nostrum.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> <5179AC21.5060708@nostrum.com> Date: Fri, 26 Apr 2013 11:53:30 -0500 Message-ID: From: Alan Johnston To: Adam Roach Content-Type: multipart/alternative; boundary=089e0115ee76f9858404db465f40 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 16:53:40 -0000 --089e0115ee76f9858404db465f40 Content-Type: text/plain; charset=ISO-8859-1 What about the API considerations? If two browsers have a source of keying material, such as a preshared key, or material derived from something else (i.e. keys on flash drives), the API needs to be able to give this key to the browser to use. This API issue is orthogonal to whether the key has been shared over an insecure signaling channel or not. - Alan - On Thu, Apr 25, 2013 at 5:20 PM, Adam Roach wrote: > On 4/25/13 17:11, Martin Thomson wrote: > >> Data channels can continue to use DTLS even though media is encrypted >> using keys provided by security descriptions. >> > > The arguments for SDES fall into two categories, AFAICT: (1) Those > required for interop with legacy devices, and (2) those which we are > prohibited by RFC 2804 from considering. And there is no possible way > DataChannels are going to interop with legacy devices. > > I agree with Alan that we shouldn't make accommodations to use SDES for > the brower-to-browser case. By implication, this means that the presence of > DataChannels necessarily means that we're using DTLS-SRTP for the whole > session. Given those assumptions, the mixed-session scenario you describe > does not arise. > > /a > > ______________________________**_________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/**listinfo/rtcweb > --089e0115ee76f9858404db465f40 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
What about the API considerations?

If two browsers have a source of keying material, such as a preshared key= , or material derived from something else (i.e. keys on flash drives), the = API needs to be able to give this key to the browser to use. =A0This API is= sue is orthogonal to whether the key has been shared over an insecure signa= ling channel or not.

- Alan -


On Thu, Apr 25, 2013 at 5:20 PM, Ada= m Roach <adam@nostrum.com> wrote:
On 4/25/13 17:11, Martin Thomson wrote:
Data channels can continue to use DTLS even though media is encrypted using= keys provided by security descriptions.

The arguments for SDES fall into two categories, AFAICT: (1) Those required= for interop with legacy devices, and (2) those which we are prohibited by = RFC 2804 from considering. And there is no possible way DataChannels are go= ing to interop with legacy devices.

I agree with Alan that we shouldn't make accommodations to use SDES for= the brower-to-browser case. By implication, this means that the presence o= f DataChannels necessarily means that we're using DTLS-SRTP for the who= le session. Given those assumptions, the mixed-session scenario you describ= e does not arise.

/a

_______________________________________________
rtcweb mailing list
rtcweb@ietf.org = https://www.ietf.org/mailman/listinfo/rtcweb

--089e0115ee76f9858404db465f40-- From roman@telurix.com Fri Apr 26 09:54:14 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6CC9721F9A18 for ; Fri, 26 Apr 2013 09:54:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.977 X-Spam-Level: X-Spam-Status: No, score=-1.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6774HxNu1I5R for ; Fri, 26 Apr 2013 09:54:14 -0700 (PDT) Received: from mail-we0-x22b.google.com (mail-we0-x22b.google.com [IPv6:2a00:1450:400c:c03::22b]) by ietfa.amsl.com (Postfix) with ESMTP id 09EB221F9969 for ; Fri, 26 Apr 2013 09:54:02 -0700 (PDT) Received: by mail-we0-f171.google.com with SMTP id t57so1856229wey.16 for ; Fri, 26 Apr 2013 09:53:57 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:x-received:in-reply-to:references:date :message-id:subject:from:to:content-type:x-gm-message-state; bh=1047QfW8N5mSrebQQMjPa1m3Mnq+nfdn+8oO2wccWcc=; b=YZFOS4dSXRXAiDSj20CEsBWkSKjNYZkrXa6aLcyywPyTDZD8n8geImqM58yYgUK8l9 mpHWOw/5hF79FGRQboZQmE0zX2swMGlL1MKIvjEsY484GVZuM/ZbKrO7ttMHDuuhnbs1 ceOW1zrVqQhjlGDnfxB/8fmSOJ56nmMNCCK9Gim3ThLhrMEm0LGcC/Gx5y2EAJM5uUeg 2oV5hOFTXxiCVEW62qm9GgehBGBZaXSTOlh+cS2x6j9KJns28OIQyGBSCgrRD6j7iKOH 7weJmsBIBoeKXUH0HO6bIfMjQqUFYed0SGCtWlFlBbPhW1knrKkojAVX/30FEIH1kHC9 HAQQ== X-Received: by 10.194.5.4 with SMTP id o4mr77277680wjo.40.1366995237558; Fri, 26 Apr 2013 09:53:57 -0700 (PDT) Received: from mail-wg0-x22b.google.com (mail-wg0-x22b.google.com [2a00:1450:400c:c00::22b]) by mx.google.com with ESMTPSA id a9sm4930985wiv.0.2013.04.26.09.53.56 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 26 Apr 2013 09:53:56 -0700 (PDT) Received: by mail-wg0-f43.google.com with SMTP id c11so2290664wgh.10 for ; Fri, 26 Apr 2013 09:53:55 -0700 (PDT) MIME-Version: 1.0 X-Received: by 10.180.21.167 with SMTP id w7mr5361374wie.2.1366995235920; Fri, 26 Apr 2013 09:53:55 -0700 (PDT) Received: by 10.216.204.202 with HTTP; Fri, 26 Apr 2013 09:53:55 -0700 (PDT) In-Reply-To: References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> Date: Fri, 26 Apr 2013 12:53:55 -0400 Message-ID: From: Roman Shpount To: rtcweb@ietf.org Content-Type: multipart/alternative; boundary=047d7b6d9a887261a804db466126 X-Gm-Message-State: ALoCoQlKPxt+VPbvIpPxHJ4xY7pJjCIRtmZ+HswiFDUdGxJ/VX+DqYa95OuqqnCrmtUKE3pd+ZmL Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 16:54:14 -0000 --047d7b6d9a887261a804db466126 Content-Type: text/plain; charset=ISO-8859-1 Have anybody tried an international call with ICE and DTLS enabled? The call setup delay introduced by the combination of the two is long enough to go from being simply annoying to the point of other person hanging up assuming the call is not working. Right now the only workaround is using SDES. _____________ Roman Shpount --047d7b6d9a887261a804db466126 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Have anybody tried an international call wi= th ICE and DTLS enabled? The call setup delay introduced by the combination= of the two is long enough to go from being simply=A0annoying to the point = of other person hanging up assuming the call is not working. Right now the = only workaround is using SDES.=A0
_____________
Roman Shpount

=A0
--047d7b6d9a887261a804db466126-- From tim@phonefromhere.com Fri Apr 26 10:23:41 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3D93121F968D for ; Fri, 26 Apr 2013 10:23:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.568 X-Spam-Level: X-Spam-Status: No, score=-2.568 tagged_above=-999 required=5 tests=[AWL=0.030, BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BwnRKbU0EUAm for ; Fri, 26 Apr 2013 10:23:40 -0700 (PDT) Received: from smtp004.apm-internet.net (smtp004.apm-internet.net [85.119.248.54]) by ietfa.amsl.com (Postfix) with ESMTP id 67AE521F95EC for ; Fri, 26 Apr 2013 10:23:38 -0700 (PDT) Received: (qmail 86073 invoked from network); 26 Apr 2013 17:23:36 -0000 X-AV-Scan: clean Received: from unknown (HELO zimbra003.verygoodemail.com) (85.119.248.218) by smtp004.apm-internet.net with SMTP; 26 Apr 2013 17:23:36 -0000 Received: from zimbra003.verygoodemail.com (localhost [127.0.0.1]) by zimbra003.verygoodemail.com (Postfix) with ESMTP id E677C18A0410; Fri, 26 Apr 2013 18:23:35 +0100 (BST) Received: from [192.67.4.33] (unknown [192.67.4.33]) by zimbra003.verygoodemail.com (Postfix) with ESMTPSA id C74A118A03A8; Fri, 26 Apr 2013 18:23:35 +0100 (BST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: multipart/alternative; boundary="Apple-Mail=_1B5A8F0E-E3F7-48A6-BD21-56010C9BEC4F" From: Tim Panton In-Reply-To: Date: Fri, 26 Apr 2013 18:23:34 +0100 Message-Id: References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> To: Suhas Nandakumar X-Mailer: Apple Mail (2.1283) Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 17:23:41 -0000 --Apple-Mail=_1B5A8F0E-E3F7-48A6-BD21-56010C9BEC4F Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 On 26 Apr 2013, at 17:36, Suhas Nandakumar wrote: > Tim,=20 >=20 > I disagree with the argument on the interop that a media gateway = is always required. Cisco for example have been shipping devices that = work fine with webrtc browsers that do H.264 without needing a media = gateway. I am sure this is true for examples other than Cisco. That's not a legacy device then. So they can just add DTLS support in the next release and they are still = good. T. --Apple-Mail=_1B5A8F0E-E3F7-48A6-BD21-56010C9BEC4F Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=iso-8859-1
On 26 Apr 2013, at 17:36, Suhas Nandakumar wrote:

Tim, 

   I disagree with the argument on the interop that  a media gateway is always required. Cisco for example have been shipping devices that work fine with webrtc browsers that do H.264 without needing a media gateway. I am sure this is true for examples other than Cisco.

That's not a legacy device then.
So they can just add DTLS support in the next release and they are still good.

T.

--Apple-Mail=_1B5A8F0E-E3F7-48A6-BD21-56010C9BEC4F-- From dd5826@att.com Fri Apr 26 10:27:20 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B378C21F9971 for ; Fri, 26 Apr 2013 10:27:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.599 X-Spam-Level: X-Spam-Status: No, score=-106.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MOUCofijZkTo for ; Fri, 26 Apr 2013 10:27:20 -0700 (PDT) Received: from nbfkord-smmo08.seg.att.com (nbfkord-smmo08.seg.att.com [209.65.160.95]) by ietfa.amsl.com (Postfix) with ESMTP id BB13721F996C for ; Fri, 26 Apr 2013 10:27:19 -0700 (PDT) Received: from unknown [144.160.112.28] (EHLO nbfkord-smmo08.seg.att.com) by nbfkord-smmo08.seg.att.com(mxl_mta-6.15.0-1) with ESMTP id 7f8ba715.58afe940.189568.00-551.531120.nbfkord-smmo08.seg.att.com (envelope-from ); Fri, 26 Apr 2013 17:27:19 +0000 (UTC) X-MXL-Hash: 517ab8f77dbfd523-0dc85c7b8d6936127a7bd5f571f185c38d0c4825 Received: from unknown [144.160.112.28] (EHLO tlpi048.enaf.dadc.sbc.com) by nbfkord-smmo08.seg.att.com(mxl_mta-6.15.0-1) over TLS secured channel with ESMTP id 5f8ba715.0.189549.00-311.531059.nbfkord-smmo08.seg.att.com (envelope-from ); Fri, 26 Apr 2013 17:27:18 +0000 (UTC) X-MXL-Hash: 517ab8f63d2edd33-272761b43aa524bbe90a6bf40775f0e160a1e01b Received: from enaf.dadc.sbc.com (localhost.localdomain [127.0.0.1]) by tlpi048.enaf.dadc.sbc.com (8.14.5/8.14.5) with ESMTP id r3QHRFiE004956; Fri, 26 Apr 2013 12:27:17 -0500 Received: from alpi134.aldc.att.com (alpi134.aldc.att.com [130.8.217.4]) by tlpi048.enaf.dadc.sbc.com (8.14.5/8.14.5) with ESMTP id r3QHR9U1004903 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 26 Apr 2013 12:27:13 -0500 Received: from WABOTH9MSGHUB8D.ITServices.sbc.com (waboth9msghub8d.itservices.sbc.com [135.163.35.93]) by alpi134.aldc.att.com (RSA Interceptor); Fri, 26 Apr 2013 17:26:52 GMT Received: from WABOTH9MSGUSR8B.ITServices.sbc.com ([135.163.35.98]) by WABOTH9MSGHUB8D.ITServices.sbc.com ([135.163.35.93]) with mapi id 14.02.0342.003; Fri, 26 Apr 2013 10:26:51 -0700 From: "DRUTA, DAN" To: Oscar Ohlsson , "rtcweb@ietf.org" Thread-Topic: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb Thread-Index: AQHOQc2XOVTqncPMgEulpjOy2XJ1wJjn1nSAgAACAICAABhyAIAAp5GAgAAPRICAAGaOgP//q29A Date: Fri, 26 Apr 2013 17:26:50 +0000 Message-ID: <4AA3A95D6033ED488F8AE4E45F47448742B13620@WABOTH9MSGUSR8B.ITServices.sbc.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> <9F33F40F6F2CD847824537F3C4E37DDF0E6C04AF@MCHP04MSX.global-ad.net> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [135.163.34.4] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-RSA-Inspected: yes X-RSA-Classifications: public X-Spam: [F=0.2000000000; CM=0.500; S=0.200(2010122901)] X-MAIL-FROM: X-SOURCE-IP: [144.160.112.28] X-AnalysisOut: [v=2.0 cv=V4/KJ5bi c=1 sm=0 a=srMsL6ituuWTYeky9Bs9mA==:17 a] X-AnalysisOut: [=YnP4VLJI-BoA:10 a=fROPODMLp6sA:10 a=ofMgfj31e3cA:10 a=BLc] X-AnalysisOut: [eEmwcHowA:10 a=8nJEP1OIZ-IA:10 a=zQP7CpKOAAAA:8 a=XIqpo32R] X-AnalysisOut: [AAAA:8 a=JE1MetyYUdEA:10 a=48vgC7mUAAAA:8 a=ag3Orf1RAAAA:8] X-AnalysisOut: [ a=AZsloQztJqdZGUtGKUoA:9 a=wPNLvfGTeEIA:10 a=lZB815dzVvQA] X-AnalysisOut: [:10 a=KwNp_X_GjOYA:10 a=vmdV1jIo-2wyaiGR:21 a=-zw1msHzJDcj] X-AnalysisOut: [IvMK:21] Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 17:27:20 -0000 I would like to see the user-agent support for SDES as a "MUST" for RTCWeb.= =20 I don't think I need to restate why. One additional point though is that it= will make interop easier, expand and accelerate the adoption for RTCWeb/We= bRTC. Isn't this the ultimate goal? =20 In regards to security considerations I would challenge the group to come u= p with ways to identify and convey the risks back to the end user through t= he user-agent implementation in a very simple and easy to understand UI (if= necessary). I know this could be a big rat hole and I can hear already arg= uments that it's already too confusing but as the Web is becoming more of a= platform and browser complexity increases we should acknowledge it with be= tter transparency rather than with restrictions and limitations. Users make= their own decisions in the end. Best Regards, Dan =20 -----Original Message----- From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of= Oscar Ohlsson Sent: Friday, April 26, 2013 7:57 AM To: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb I'm also in favour of supporting SDES (no big surprise). But we need to ana= lyze how SDES should be enabled and how it can be negotiated in SDP. If peo= ple are concerned with bidding down attacks then we could add a separate Ja= vaScript instruction for enabling SDES. If SDES is not enabled then it woul= dn't be offered or accepted. Regards, Oscar From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of= Xavier Marjou Sent: den 26 april 2013 10:50 To: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb +1 for supporting SDES as a=A0keying method for WebRTC Cheers, Xavier On Fri, Apr 26, 2013 at 9:55 AM, Hutton, Andrew wrote: Also agree that we should support SDES in additional to DTLS-SRTP. Regards Andy > -----Original Message----- > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > Behalf Of Ejzak, Richard P (Richard) > Sent: 25 April 2013 22:55 > To: rtcweb@ietf.org > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > I also agree that we should support SDES in addition to DTLS-SRTP. > > This raises a further question about SCTP/DTLS for DataChannels. =A0It > seems that if we support SDES-SRTP, don't we also need to provide an > SDES keying mechanism for DataChannels? =A0Ekr: What is needed to realize > this? > > Richard Ejzak > > > -----Original Message----- > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > Behalf Of Matthew Kaufman (SKYPE) > > Sent: Thursday, April 25, 2013 3:28 PM > > To: Bogineni, Kalyani; 'Cullen Jennings'; rtcweb@ietf.org > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > I agree. The ability to set the cipher suite and keys from JavaScript > > is critical for certain applications. SDES is the best we'll get with > > SDP as the API. DTLS-SRTP-only would be unacceptably limiting. > > > > Matthew Kaufman > > > > > -----Original Message----- > > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > > Behalf Of Bogineni, Kalyani > > > Sent: Thursday, April 25, 2013 1:21 PM > > > To: 'Cullen Jennings'; rtcweb@ietf.org > > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and > RTCWeb > > > > > > We would like to support the use of SDES as a keying method for > > WebRTC. > > > > > > Kalyani Bogineni > > > Verizon > > > > > > -----Original Message----- > > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > > Behalf Of Cullen Jennings > > > Sent: Thursday, April 25, 2013 11:57 AM > > > To: rtcweb@ietf.org > > > Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > > > > > > The working groups committed some time ago to have a further > > > discussion on whether SDP Security Descriptions (RFC 4568 aka SDES) > > > would be usable as a keying method for WebRTC. =A0As we prepare for > > that > > > discussion, we'd like to have expressions of interest or support > for > > > that approach which indicate the general outlines of support > > proposed. > > > If you wish to make such an expression of support, please send it > to > > the chairs or the list. > > > > > > Cullen, Magnus, & Ted > > > > > > > > > _______________________________________________ > > > rtcweb mailing list > > > rtcweb@ietf.org > > > https://www.ietf.org/mailman/listinfo/rtcweb > > > _______________________________________________ > > > rtcweb mailing list > > > rtcweb@ietf.org > > > https://www.ietf.org/mailman/listinfo/rtcweb > > > > _______________________________________________ > > rtcweb mailing list > > rtcweb@ietf.org > > https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb _______________________________________________ rtcweb mailing list rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb _______________________________________________ rtcweb mailing list rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb From randell-ietf@jesup.org Fri Apr 26 10:36:05 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0B79A21F9946 for ; Fri, 26 Apr 2013 10:36:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.274 X-Spam-Level: X-Spam-Status: No, score=-2.274 tagged_above=-999 required=5 tests=[AWL=0.325, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OA+nTaTji1x2 for ; Fri, 26 Apr 2013 10:36:03 -0700 (PDT) Received: from r2-chicago.webserversystems.com (r2-chicago.webserversystems.com [173.236.101.58]) by ietfa.amsl.com (Postfix) with ESMTP id BE90521F992A for ; Fri, 26 Apr 2013 10:36:03 -0700 (PDT) Received: from pool-98-111-140-34.phlapa.fios.verizon.net ([98.111.140.34]:2332 helo=[192.168.1.12]) by r2-chicago.webserversystems.com with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.80) (envelope-from ) id 1UVmZ0-0006wA-QJ for rtcweb@ietf.org; Fri, 26 Apr 2013 12:36:02 -0500 Message-ID: <517ABB06.5070807@jesup.org> Date: Fri, 26 Apr 2013 13:36:06 -0400 From: Randell Jesup User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <5174C8D2.40504@matthew.at> <5177F7EE.1010909@matthew.at> <5179A362.2000309@jesup.org> <517A86CB.5020305@matthew.at> In-Reply-To: <517A86CB.5020305@matthew.at> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - r2-chicago.webserversystems.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - jesup.org Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 17:36:05 -0000 On 4/26/2013 9:53 AM, Matthew Kaufman wrote: > On 4/25/2013 2:42 PM, Randell Jesup wrote: >> On 4/25/2013 5:10 PM, Cullen Jennings (fluffy) wrote: >>> So with my co-chair hat on here… >>> >>> It seems we have been around the need for OPEN several times and >>> have come to consensus on it in the past. Can someone please: >>> >>> 1) summarize the arguments that in the past that lead us to think we >>> need OPEN >> >> The Open message has some important and useful properties: >> >> 1) It's easier to work with. JS isn't an ideal language for writing >> network protocols, especially for non-network-programmers (i.e. a >> large portion of the expected developer community). Open makes it >> really easy for a developer to get the type of bidirectional stream >> them want with little fuss, and in a manner that maps easily to APIs >> they're already used to (e.g. WebSockets). In many cases the label >> field will avoid the JS programmer having to build their own >> mini-protocol to identify their channels (and this is especially >> painful for them if it's an unreliable channel). > > Easier how? The initiating side needs to create their object without > the benefit of the contents of an open message. If a JS developer > isn't smart enough to set up the channel parameters they want at the > initiating end, then there's nothing we can do for them. There's then > several ways forward after that, including "the other side does the > same thing to create their end" (my preference) and "the parameters > are transported using the existing SDP O/A mechanism to the far end" > (generally how the WG solves this kind of problem). > > As far as I can tell, the one useful thing in the OPEN message is the > label (as I pointed out in my very first inquiry about why anyone > thought it was needed), and yet the label is allowed to be null, so in > that case how can it be helpful? It's helpful if you need it (if you're opening a number of channels, such as one per participant in a conference). Protocol is also helpful (note it's in the dictionary and is also optional); both for cross-application channels and for within an app to indicate what handling logic the channel should feed. // pseudo-codey: function called_from_ondatachanne(event) { channel = event.channel; if (channel.protocol == "file transfer") { channel.onmessage = handle_incoming_file; } else if (channel.protocol == "chat") {chat = new chat_instance(channel.label); channel.onmessage = chat.incoming; } } > >> >> 2) It makes it possible to have different applications exchange data, >> by having an IANA-registered protocol name, like WebSockets (and >> there was strong agreement on it's being needed for that at >> Atlanta.) With external-negotiation-only, it would be very hard for >> different apps to interoperate, since they'd need to agree on >> negotiation protocols as well, which are likely to be highly >> divergent between apps. > > If we went with "negotiated via the SDP O/A mechanism" then we could > go to our favorite SDP-defining WG and have a negotiation protocol > that is standardized, so not divergent at all between apps. We also don't have one that's divergent by using Open (and we leave the option of externally negotiating or pre-defining channels). And SDP is at least one signaling-RTT to complete, plus a bunch of logic to handle matching everything up (what if channels disappear in the offer or answer, or in an offer or answer they change properties? What if the signaling channel is slow or unavailable any more (server rebooted, server has network issues, etc)? I'm not saying there aren't answers/solutions to all these. But those answers and solutions would need to be speced out or at least understood, and the code to handle all of them is likely to be similar in scope (though quite different in detail). And the less done in SDP, the better IMHO; I have no wish to increase our reliance on SDP. >> >> 3) The Open message, being in-channel, reliable and in-order, makes >> the issue that was the genesis of this thread (what to do with data >> that arrives unexpectedly) simpler. > > I disagree. It increases the number of possible states... there's > cases where the OPEN message arrives but the application doesn't want > to be receiving that data, and the cases where the OPEN message > doesn't arrive but the application does want the data that is already > arriving. Both of those states don't exist if there's no OPEN message. My point was you need to decide what to do with that data regardless of if the channel gets created with a delayed OPEN or with a delayed external negotiation. And with OPEN, those cases don't even arise for ordered channels. > >> With Open, only degenerate cases can cause more than a relatively >> small amount of data to be buffered. > > Sure, but those degenerate cases occur many times per day on the real > Internet. I doubt that. The degenerate cases for Open require that all the open packets get lost, while a sizable amount of non-open packets get through - and after a time, SCTP will fail the entire association if reliable data isn't getting through. Plus, as I indicated, we can also have limits on time and/or amount of data buffered. Also: nothing *requires* that an application send data immediately on onopen. An application can institute it's own handshake trivially: function my_ondatachannel(event) { event.channel.send(ok_to_start_sending); ... } > >> With external notification, the external negotiation channel can fail >> (or be very slow), or the app can have a bug and fail to install the >> negotiated values, leading to larger or unbounded buffering >> requirements - or you punt the problem to the application by >> delivering the data, but the application is facing the same conundrum >> of buffer it or throw it away. >> >>> 2) sketch out the range of possible solutions to deal with >>> unexpected data before the OPEN >> >> >> The issue exists regardless of whether Open is used or external >> negotiation (and in fact is much simpler for Open). >> >> *tl;dr: *I'm ok with any setting of maximum sizes and/or times that >> would not adversely impact temporary buffering for normal cases with >> Open of unordered channels. This is option C below. I also would be >> ok with B, but I realize others may not be. >> >> Regardless of supporting Open or not, any external negotiation of >> dynamic channels must use one of these: >> >> A) a 2-or-3-way handshake so the sender knows the receiver is ready >> to receive the data on the specified channel before sending it, or >> >> B) unbounded buffering of data if the external negotiation messages >> are delayed (again, what we're discussing in this thread), or >> >> C) bounded buffering of data (bounded by time, size or both), with >> data being dropped and the channel closed if the limits are exceeded, or >> >> D) deliver unexpected data to the application, which will do .... I >> don't know what with it. >> >> For (D), the application will likely drop it on the floor (leading to >> hard-to-test-for problems if the channel is later configured by Open >> or external negotiation), or buffer it waiting for the channel to open. >> >> Supporting Open or not has little bearing on these scenarios > > So if that's true, then why do we need it? This was a discussion of "what to do with data that arrives unexpectedly (i.e. before Open, or before the application installed the result of an external negotiation); this was the original point of the thread before you decided to question the selection of Open as a message. The caveat at the top was "external negotiation of dynamic channels must do one of these" regardless of whether Open is supported. The options for use with Open are the same, but the amount of data that can be buffered is smaller (since with external negotiation there are no limits on the amount that could attempt to be queued -- the same applies SDP if you allow the sender to send data before the negotiation is complete; SDP is effectively a form of external negotiation). > >> -- and in fact, since Open is in-channel, reliable, and ordered, it >> reduces the problem set (when Open is used) to only unordered >> channels (in ordered channels Open will always be first). >> >> Buffering unexpected data on channels (options B or C) is useful. It >> means that in the external negotiation case, one side asking for a >> new channel to open by some private means doesn't need to wait to >> start sending data on that channel. > > Of course this is different from the TCP model, where the buffering > happens at the *sender* until the handshake is complete. Ok, but this isn't TCP. And handshakes (and the resultant delay before onopen fired) were eliminated in order to respond to the requests of multiple people, giving us a 0-RTT declarative protocol where you can send immediately, which will help apps that need to exchange data quickly at the start of a connection. > The problem here is that we have an existing mechanism inside of SCTP > and then we're adding another layer on top of that which is neither > inside SCTP (where it probably belongs) or under the application > developer's control (where I'd like to see it, if the data transport > protocol can't have it), and this layer conflicts with what both of > those might be doing. If you're referring to Open, you can totally ignore Open and not use it in your datachannels, and use all external negotiation or pre-defined channels. If you want, you can just pre-define N open channels that the other side can then use to send data to you, and nothing will ever be buffered, and you can handle it all yourself. > >> Note that with external negotiation (possibly on a non p2p path, like >> via signaling), the receiver might not know what to install for a >> short while, especially if there's a routing issue or server issue >> (not a problem that happens with Open). > > Which is fine if the sender doesn't start sending (like TCP). Or if > the transport protocol itself handles the delivery of the channel > metadata. (Which is what SCTP, or whatever transport we choose for > RTCWEB, should do) then you just handle the label and whatever other > metadata the receiver would like to know at that layer. I.e. data streams from RTMFP, I take it? ;-) > >> >> Since normal Open cases have very little chance of triggering this >> problem (triggering buffering), some arbitrary size limit seems >> reasonable (option C). Often in network protocols there are small >> buffers (4, 16, 64KB). I prefer a larger value of say 256KB so that >> apps using external negotiation can just send largish data >> immediately - and note: actually buffering data is still an unlikely >> occurrence even in most external negotiation cases. If people want >> to bikeshed on the buffersize or timeout, that's fine. ;-) >> >> Also, external negotiation is the only case where more than a trivial >> amount of data can "pile up" in the buffer waiting for the receiving >> side to finish it's side of the negotiation (i.e. if your external >> negotiation channel fails or the app has a brain fart). >> >> > > Another great argument for having this negotiation happen within the > transport itself. If you want to argue for replacing SCTP as the base layer - we made that decision a good long while ago. And there's a good, maintained, BSD-licensed implementation - and the authors of that are working with us here in designing a DataChannel protocol to ride on top of it. If you want to argue that the layer on top of SCTP should be handshaked once again (as it was until people objected) that's up to you to make the case for. IMO: I'd like to avoid continuing to circle through the range of all possible protocols one at a time, repeating every few months. I'll assert we can bikeshed on this until we all retire, and we'll never have something that makes everyone entirely happy (unless most people get tired and stop caring). All solutions have tradeoffs; none is perfect for all use-cases and users. We arrived at a proposal that had general agreement in the room to move forward with per the consensus call, and I'm preparing a WG draft in response to that. Some may like it more and some less, but there was agreement that people could work with it. -- Randell Jesup randell-ietf@jesup.org From ibc@aliax.net Fri Apr 26 10:36:57 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5C69321F9959 for ; Fri, 26 Apr 2013 10:36:57 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.677 X-Spam-Level: X-Spam-Status: No, score=-1.677 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, MIME_8BIT_HEADER=0.3, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id DPynpRehIfeF for ; Fri, 26 Apr 2013 10:36:56 -0700 (PDT) Received: from mail-qa0-x22f.google.com (mail-qa0-x22f.google.com [IPv6:2607:f8b0:400d:c00::22f]) by ietfa.amsl.com (Postfix) with ESMTP id 27A5421F9957 for ; Fri, 26 Apr 2013 10:36:56 -0700 (PDT) Received: by mail-qa0-f47.google.com with SMTP id bn16so288812qab.20 for ; Fri, 26 Apr 2013 10:36:55 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type:x-gm-message-state; bh=74pzw+h/bf/jG6ub9MlDFOhIG0REF3kPwvdUnq992xM=; b=NWahnNNY/CcNy+y2yIKLZeb1JY8WYCM0blp+OU2nsyEePJjEakTmxlhDzeYy538nqL afvucpwrvm0wUU97oYfmuajC2O0gCrnLgtkbEzo/XZaZ+xohj2VoGdiK91nf263YRjsL hHT7WQVgABjccIYkH+eBIMEttCDEZGRAzde+RUA62unzKfeu8yuDe/Jn9/3ytTfSQfrl 7VOFdro1R2LGbKychZKG/wrcCVFvBBZUuA/IEecj9LInK5lLsml0btsu8YQglZDvmQxs 5frUQIb4OvC4zyLTturrGKljS/BhuvonDj0385lLLcGqS919jrdu+TqpDs/vkGbGYFkz b2Mg== MIME-Version: 1.0 X-Received: by 10.229.150.199 with SMTP id z7mr2073291qcv.25.1366997815566; Fri, 26 Apr 2013 10:36:55 -0700 (PDT) Received: by 10.49.81.175 with HTTP; Fri, 26 Apr 2013 10:36:54 -0700 (PDT) Received: by 10.49.81.175 with HTTP; Fri, 26 Apr 2013 10:36:54 -0700 (PDT) In-Reply-To: <4AA3A95D6033ED488F8AE4E45F47448742B13620@WABOTH9MSGUSR8B.ITServices.sbc.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> <9F33F40F6F2CD847824537F3C4E37DDF0E6C04AF@MCHP04MSX.global-ad.net> <4AA3A95D6033ED488F8AE4E45F47448742B13620@WABOTH9MSGUSR8B.ITServices.sbc.com> Date: Fri, 26 Apr 2013 19:36:54 +0200 Message-ID: From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= To: "DRUTA, DAN" Content-Type: multipart/alternative; boundary=e89a8f6469df34bf4a04db46fb06 X-Gm-Message-State: ALoCoQlph8/ZCDW66HrD1zUYnPwKJ/EipA77KlKUVYM3Q2c77yBA02/+8dvoBrc6RnkfF5wcgMpv Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 17:36:57 -0000 --e89a8f6469df34bf4a04db46fb06 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Adding DTLS is a little effort compared to adding ICE / bundle / SAVPF to a device. I could understand the latency problem argument however, but not the "easy interop" argument which has become a headache and forced the SDP API adoption which makes WebRTC much harder than it could be. -- I=C3=B1aki Baz Castillo El 26/04/2013 19:27, "DRUTA, DAN" escribi=C3=B3: > I would like to see the user-agent support for SDES as a "MUST" for RTCWe= b. > I don't think I need to restate why. One additional point though is that > it will make interop easier, expand and accelerate the adoption for > RTCWeb/WebRTC. Isn't this the ultimate goal? > In regards to security considerations I would challenge the group to come > up with ways to identify and convey the risks back to the end user throug= h > the user-agent implementation in a very simple and easy to understand UI > (if necessary). I know this could be a big rat hole and I can hear alread= y > arguments that it's already too confusing but as the Web is becoming more > of a platform and browser complexity increases we should acknowledge it > with better transparency rather than with restrictions and limitations. > Users make their own decisions in the end. > > Best Regards, > Dan > > > -----Original Message----- > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf > Of Oscar Ohlsson > Sent: Friday, April 26, 2013 7:57 AM > To: rtcweb@ietf.org > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > I'm also in favour of supporting SDES (no big surprise). But we need to > analyze how SDES should be enabled and how it can be negotiated in SDP. I= f > people are concerned with bidding down attacks then we could add a separa= te > JavaScript instruction for enabling SDES. If SDES is not enabled then it > wouldn't be offered or accepted. > > Regards, > > Oscar > > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf > Of Xavier Marjou > Sent: den 26 april 2013 10:50 > To: rtcweb@ietf.org > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > +1 for supporting SDES as a keying method for WebRTC > Cheers, > Xavier > > On Fri, Apr 26, 2013 at 9:55 AM, Hutton, Andrew < > andrew.hutton@siemens-enterprise.com> wrote: > Also agree that we should support SDES in additional to DTLS-SRTP. > > Regards > Andy > > > -----Original Message----- > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > Behalf Of Ejzak, Richard P (Richard) > > Sent: 25 April 2013 22:55 > > To: rtcweb@ietf.org > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > I also agree that we should support SDES in addition to DTLS-SRTP. > > > > This raises a further question about SCTP/DTLS for DataChannels. It > > seems that if we support SDES-SRTP, don't we also need to provide an > > SDES keying mechanism for DataChannels? Ekr: What is needed to realize > > this? > > > > Richard Ejzak > > > > > -----Original Message----- > > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > > Behalf Of Matthew Kaufman (SKYPE) > > > Sent: Thursday, April 25, 2013 3:28 PM > > > To: Bogineni, Kalyani; 'Cullen Jennings'; rtcweb@ietf.org > > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > > > I agree. The ability to set the cipher suite and keys from JavaScript > > > is critical for certain applications. SDES is the best we'll get with > > > SDP as the API. DTLS-SRTP-only would be unacceptably limiting. > > > > > > Matthew Kaufman > > > > > > > -----Original Message----- > > > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > > > Behalf Of Bogineni, Kalyani > > > > Sent: Thursday, April 25, 2013 1:21 PM > > > > To: 'Cullen Jennings'; rtcweb@ietf.org > > > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and > > RTCWeb > > > > > > > > We would like to support the use of SDES as a keying method for > > > WebRTC. > > > > > > > > Kalyani Bogineni > > > > Verizon > > > > > > > > -----Original Message----- > > > > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > > > > Behalf Of Cullen Jennings > > > > Sent: Thursday, April 25, 2013 11:57 AM > > > > To: rtcweb@ietf.org > > > > Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > > > > > > > > > The working groups committed some time ago to have a further > > > > discussion on whether SDP Security Descriptions (RFC 4568 aka SDES) > > > > would be usable as a keying method for WebRTC. As we prepare for > > > that > > > > discussion, we'd like to have expressions of interest or support > > for > > > > that approach which indicate the general outlines of support > > > proposed. > > > > If you wish to make such an expression of support, please send it > > to > > > the chairs or the list. > > > > > > > > Cullen, Magnus, & Ted > > > > > > > > > > > > _______________________________________________ > > > > rtcweb mailing list > > > > rtcweb@ietf.org > > > > https://www.ietf.org/mailman/listinfo/rtcweb > > > > _______________________________________________ > > > > rtcweb mailing list > > > > rtcweb@ietf.org > > > > https://www.ietf.org/mailman/listinfo/rtcweb > > > > > > _______________________________________________ > > > rtcweb mailing list > > > rtcweb@ietf.org > > > https://www.ietf.org/mailman/listinfo/rtcweb > > _______________________________________________ > > rtcweb mailing list > > rtcweb@ietf.org > > https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > --e89a8f6469df34bf4a04db46fb06 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

Adding DTLS is a little effort compared to adding ICE / bund= le / SAVPF to a device. I could understand the latency problem argument how= ever, but not the "easy interop" argument which has become a head= ache and forced the SDP API adoption which makes WebRTC much harder than it= could be.

--
I=C3=B1aki Baz Castillo
<ibc@aliax.net>

El 26/04/2013 19:27, "DRUTA, DAN" <= dd5826@att.com> escribi=C3=B3:
I would like to see the user-agent support for SDES as a "MUST" f= or RTCWeb.
I don't think I need to restate why. One additional point though is tha= t it will make interop easier, expand and accelerate the adoption for RTCWe= b/WebRTC. Isn't this the ultimate goal?
In regards to security considerations I would challenge the group to come u= p with ways to identify and convey the risks back to the end user through t= he user-agent implementation in a very simple and easy to understand UI (if= necessary). I know this could be a big rat hole and I can hear already arg= uments that it's already too confusing but as the Web is becoming more = of a platform and browser complexity increases we should acknowledge it wit= h better transparency rather than with restrictions and limitations. Users = make their own decisions in the end.

Best Regards,
Dan


-----Original Message-----
From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.or= g] On Behalf Of Oscar Ohlsson
Sent: Friday, April 26, 2013 7:57 AM
To: rtcweb@ietf.org
Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb

I'm also in favour of supporting SDES (no big surprise). But we need to= analyze how SDES should be enabled and how it can be negotiated in SDP. If= people are concerned with bidding down attacks then we could add a separat= e JavaScript instruction for enabling SDES. If SDES is not enabled then it = wouldn't be offered or accepted.

Regards,

Oscar


From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.or= g] On Behalf Of Xavier Marjou
Sent: den 26 april 2013 10:50
To: rtcweb@ietf.org
Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb

+1 for supporting SDES as a=C2=A0keying method for WebRTC
Cheers,
Xavier

On Fri, Apr 26, 2013 at 9:55 AM, Hutton, Andrew <andrew.hutton@siemens-enterprise.com&g= t; wrote:
Also agree that we should support SDES in additional to DTLS-SRTP.

Regards
Andy

> -----Original Message-----
> From: rtcweb-bounces@ietf.o= rg [mailto:rtcweb-bounces@ie= tf.org] On
> Behalf Of Ejzak, Richard P (Richard)
> Sent: 25 April 2013 22:55
> To: rtcweb@ietf.org
> Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb<= br> >
> I also agree that we should support SDES in addition to DTLS-SRTP.
>
> This raises a further question about SCTP/DTLS for DataChannels. =C2= =A0It
> seems that if we support SDES-SRTP, don't we also need to provide = an
> SDES keying mechanism for DataChannels? =C2=A0Ekr: What is needed to r= ealize
> this?
>
> Richard Ejzak
>
> > -----Original Message-----
> > From: rtcweb-bounces@i= etf.org [mailto:rtcweb-bounc= es@ietf.org] On
> > Behalf Of Matthew Kaufman (SKYPE)
> > Sent: Thursday, April 25, 2013 3:28 PM
> > To: Bogineni, Kalyani; 'Cullen Jennings'; rtcweb@ietf.org
> > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RT= CWeb
> >
> > I agree. The ability to set the cipher suite and keys from JavaSc= ript
> > is critical for certain applications. SDES is the best we'll = get with
> > SDP as the API. DTLS-SRTP-only would be unacceptably limiting. > >
> > Matthew Kaufman
> >
> > > -----Original Message-----
> > > From: rtcweb-boun= ces@ietf.org [mailto:rtcweb-= bounces@ietf.org] On
> > > Behalf Of Bogineni, Kalyani
> > > Sent: Thursday, April 25, 2013 1:21 PM
> > > To: 'Cullen Jennings'; rtcweb@ietf.org
> > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) a= nd
> RTCWeb
> > >
> > > We would like to support the use of SDES as a keying method = for
> > WebRTC.
> > >
> > > Kalyani Bogineni
> > > Verizon
> > >
> > > -----Original Message-----
> > > From: rtcweb-boun= ces@ietf.org [mailto:rtcweb-= bounces@ietf.org] On
> > > Behalf Of Cullen Jennings
> > > Sent: Thursday, April 25, 2013 11:57 AM
> > > To: rtcweb@ietf.org > > > Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and R= TCWeb
> > >
> > >
> > > The working groups committed some time ago to have a further=
> > > discussion on whether SDP Security Descriptions (RFC 4568 ak= a SDES)
> > > would be usable as a keying method for WebRTC. =C2=A0As we p= repare for
> > that
> > > discussion, we'd like to have expressions of interest or= support
> for
> > > that approach which indicate the general outlines of support=
> > proposed.
> > > If you wish to make such an expression of support, please se= nd it
> to
> > the chairs or the list.
> > >
> > > Cullen, Magnus, & Ted <The Chairs>
> > >
> > >
> > > _______________________________________________
> > > rtcweb mailing list
> > > rtcweb@ietf.org
> > > https://www.ietf.org/mailman/listinfo/rtcweb
> > > _______________________________________________
> > > rtcweb mailing list
> > > rtcweb@ietf.org
> > > https://www.ietf.org/mailman/listinfo/rtcweb
> >
> > _______________________________________________
> > rtcweb mailing list
> > rtcweb@ietf.org
> > https://www.ietf.org/mailman/listinfo/rtcweb
> _______________________________________________
> rtcweb mailing list
> rtcweb@ietf.org
> https://www.ietf.org/mailman/listinfo/rtcweb
_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
= https://www.ietf.org/mailman/listinfo/rtcweb

_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
= https://www.ietf.org/mailman/listinfo/rtcweb
_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
= https://www.ietf.org/mailman/listinfo/rtcweb
--e89a8f6469df34bf4a04db46fb06-- From fluffy@iii.ca Fri Apr 26 10:57:42 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AE1E421F99D3 for ; Fri, 26 Apr 2013 10:57:42 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 69vW6UKx5D-S for ; Fri, 26 Apr 2013 10:57:41 -0700 (PDT) Received: from mxout-07.mxes.net (mxout-07.mxes.net [216.86.168.182]) by ietfa.amsl.com (Postfix) with ESMTP id 9FCAD21F99CA for ; Fri, 26 Apr 2013 10:57:41 -0700 (PDT) Received: from [192.168.4.100] (unknown [128.107.239.233]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by smtp.mxes.net (Postfix) with ESMTPSA id D92D722E259; Fri, 26 Apr 2013 13:57:34 -0400 (EDT) Content-Type: text/plain; charset=windows-1252 Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) From: Cullen Jennings In-Reply-To: <5179A362.2000309@jesup.org> Date: Fri, 26 Apr 2013 11:57:33 -0600 Content-Transfer-Encoding: quoted-printable Message-Id: References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <5174C8D2.40504@matthew.at> <5177F7EE.1010909@matthew.at> <5179A362.2000309@jesup.org> To: Randell Jesup X-Mailer: Apple Mail (2.1503) Cc: rtcweb@ietf.org Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 17:57:42 -0000 Thank you summarizing all this.=20 On Apr 25, 2013, at 3:42 PM, Randell Jesup = wrote: > On 4/25/2013 5:10 PM, Cullen Jennings (fluffy) wrote: >> So with my co-chair hat on here=85 >>=20 >> It seems we have been around the need for OPEN several times and have = come to consensus on it in the past. Can someone please: >>=20 >> 1) summarize the arguments that in the past that lead us to think we = need OPEN >=20 > The Open message has some important and useful properties: >=20 > 1) It's easier to work with. JS isn't an ideal language for writing = network protocols, especially for non-network-programmers (i.e. a large = portion of the expected developer community). Open makes it really easy = for a developer to get the type of bidirectional stream them want with = little fuss, and in a manner that maps easily to APIs they're already = used to (e.g. WebSockets). In many cases the label field will avoid the = JS programmer having to build their own mini-protocol to identify their = channels (and this is especially painful for them if it's an unreliable = channel). >=20 > 2) It makes it possible to have different applications exchange data, = by having an IANA-registered protocol name, like WebSockets (and there = was strong agreement on it's being needed for that at Atlanta.) With = external-negotiation-only, it would be very hard for different apps to = interoperate, since they'd need to agree on negotiation protocols as = well, which are likely to be highly divergent between apps. >=20 > 3) The Open message, being in-channel, reliable and in-order, makes = the issue that was the genesis of this thread (what to do with data that = arrives unexpectedly) simpler. With Open, only degenerate cases can = cause more than a relatively small amount of data to be buffered. With = external notification, the external negotiation channel can fail (or be = very slow), or the app can have a bug and fail to install the negotiated = values, leading to larger or unbounded buffering requirements - or you = punt the problem to the application by delivering the data, but the = application is facing the same conundrum of buffer it or throw it away. >=20 >> 2) sketch out the range of possible solutions to deal with unexpected = data before the OPEN >=20 >=20 > The issue exists regardless of whether Open is used or external = negotiation (and in fact is much simpler for Open). >=20 > *tl;dr: *I'm ok with any setting of maximum sizes and/or times that = would not adversely impact temporary buffering for normal cases with = Open of unordered channels. This is option C below. I also would be ok = with B, but I realize others may not be. >=20 > Regardless of supporting Open or not, any external negotiation of = dynamic channels must use one of these: >=20 > A) a 2-or-3-way handshake so the sender knows the receiver is ready to = receive the data on the specified channel before sending it, or >=20 > B) unbounded buffering of data if the external negotiation messages = are delayed (again, what we're discussing in this thread), or >=20 > C) bounded buffering of data (bounded by time, size or both), with = data being dropped and the channel closed if the limits are exceeded, or >=20 > D) deliver unexpected data to the application, which will do .... I = don't know what with it. >=20 > For (D), the application will likely drop it on the floor (leading to = hard-to-test-for problems if the channel is later configured by Open or = external negotiation), or buffer it waiting for the channel to open. >=20 > Supporting Open or not has little bearing on these scenarios -- and in = fact, since Open is in-channel, reliable, and ordered, it reduces the = problem set (when Open is used) to only unordered channels (in ordered = channels Open will always be first). >=20 > Buffering unexpected data on channels (options B or C) is useful. It = means that in the external negotiation case, one side asking for a new = channel to open by some private means doesn't need to wait to start = sending data on that channel. Note that with external negotiation = (possibly on a non p2p path, like via signaling), the receiver might not = know what to install for a short while, especially if there's a routing = issue or server issue (not a problem that happens with Open). >=20 > Since normal Open cases have very little chance of triggering this = problem (triggering buffering), some arbitrary size limit seems = reasonable (option C). Often in network protocols there are small = buffers (4, 16, 64KB). I prefer a larger value of say 256KB so that = apps using external negotiation can just send largish data immediately - = and note: actually buffering data is still an unlikely occurrence even = in most external negotiation cases. If people want to bikeshed on the = buffersize or timeout, that's fine. ;-) >=20 > Also, external negotiation is the only case where more than a trivial = amount of data can "pile up" in the buffer waiting for the receiving = side to finish it's side of the negotiation (i.e. if your external = negotiation channel fails or the app has a brain fart). >=20 >=20 > --=20 > Randell Jesup > randell-ietf@jesup.org >=20 > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From roman@telurix.com Fri Apr 26 10:59:37 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EC6F121F980A for ; Fri, 26 Apr 2013 10:59:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.827 X-Spam-Level: X-Spam-Status: No, score=-1.827 tagged_above=-999 required=5 tests=[AWL=-0.150, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, MIME_8BIT_HEADER=0.3, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6ei0LCj5CVdH for ; Fri, 26 Apr 2013 10:59:37 -0700 (PDT) Received: from mail-wi0-x232.google.com (mail-wi0-x232.google.com [IPv6:2a00:1450:400c:c05::232]) by ietfa.amsl.com (Postfix) with ESMTP id EB8AA21F8DBB for ; Fri, 26 Apr 2013 10:59:36 -0700 (PDT) Received: by mail-wi0-f178.google.com with SMTP id hm14so913031wib.11 for ; Fri, 26 Apr 2013 10:59:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:x-received:in-reply-to:references:date :message-id:subject:from:to:cc:content-type:x-gm-message-state; bh=bSTBJ9RRhBaGnpevUpKT2JBVJJvQloYSVaLt6OoyEmA=; b=Ma7oDvQCdPkBks9tUD29hsV/u7nweqkehKuUe8U/YD48+1XFAdKXK2/rPCP0hZ9gSE sOFGPYzc5WBMjj31XvbJuzsfSiJOHtuJvVYS69+xJEl+EWyBLwq1BH9rUn8yvk7QR2ue t2CUfQ4A1ZfD3WHzfKrNNbo4TbLBLOKtt+1/GIPH19jn13S0IBy7uKVwV2zyGQvmy/Ld Se1CMNaJj8nAgri40XdAn5hVpsqnjfYyzfyigTUfIlJHhb5O3PLDQJYsnd2MaLMLcvO9 eJm1u6jM3nRg/EeZ2DMZ0bFQdbRabRPUYnAm5zbRVakl/oUcqV3LSfV27ihwIPVVGPst Jx8g== X-Received: by 10.180.210.225 with SMTP id mx1mr5691087wic.15.1366999176114; Fri, 26 Apr 2013 10:59:36 -0700 (PDT) Received: from mail-wi0-x229.google.com (mail-wi0-x229.google.com [2a00:1450:400c:c05::229]) by mx.google.com with ESMTPSA id t7sm5009377wij.2.2013.04.26.10.59.34 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 26 Apr 2013 10:59:35 -0700 (PDT) Received: by mail-wi0-f169.google.com with SMTP id h11so1047612wiv.0 for ; Fri, 26 Apr 2013 10:59:34 -0700 (PDT) MIME-Version: 1.0 X-Received: by 10.180.72.227 with SMTP id g3mr4454185wiv.1.1366999174330; Fri, 26 Apr 2013 10:59:34 -0700 (PDT) Received: by 10.216.204.202 with HTTP; Fri, 26 Apr 2013 10:59:34 -0700 (PDT) In-Reply-To: References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> <9F33F40F6F2CD847824537F3C4E37DDF0E6C04AF@MCHP04MSX.global-ad.net> <4AA3A95D6033ED488F8AE4E45F47448742B13620@WABOTH9MSGUSR8B.ITServices.sbc.com> Date: Fri, 26 Apr 2013 13:59:34 -0400 Message-ID: From: Roman Shpount To: =?ISO-8859-1?Q?I=F1aki_Baz_Castillo?= Content-Type: multipart/alternative; boundary=f46d043c819231c18404db474c6a X-Gm-Message-State: ALoCoQlMjTFLkJIXRnqogX5pu+3FYzI/2tAAIfJ1ze6gSjUcrWZe/bQGYtUGzSfkg+XGxvyMcVOP Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 17:59:38 -0000 --f46d043c819231c18404db474c6a Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Fri, Apr 26, 2013 at 1:36 PM, I=F1aki Baz Castillo wrote= : > Adding DTLS is a little effort compared to adding ICE / bundle / SAVPF to > a device. I could understand the latency problem argument however, but no= t > the "easy interop" argument which has become a headache and forced the SD= P > API adoption which makes WebRTC much harder than it could be. > > I would argue that SDP adoption made WebRTC harder to interop, but there is already consensus that SDP should be used, so there is no point to talk about it anymore. The arguments why SDES is required in some cases instead of DTLS are: 1. Additional call setup delay caused by DTLS 2. High computational load on each call setup. This can be significant with high number of short calls being setup. This would be especially significant for any sort of server interfacing WebRTC or WebRTC to SIP gateway. 3. High complexity -- you are doubling or tripling amount of code you need in your SRTP stack to support DTLS negotiations. Most of the code in readily available libraries is not needed and represents no functional value (certificate support, unneeded encryption methods, compression, streaming, etc), but will require a significant amount of support effort and can be a security risk (I am talking about something like OpenSSL or GnuTLS which ends up in the media processing stack). As it stands right now, I would prefer never to use DTLS-SRTP with any client to server communication applications, since it has no security value in such scenarios (server can access media anyway) and will cause significant usability, performance, and support issues. _____________ Roman Shpount --f46d043c819231c18404db474c6a Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Fri, Apr 26, 2013 at 1:36 PM, I=F1aki Baz Castillo <= ;ibc@aliax.net> wrote:

Adding DTLS is a little effort compared to adding ICE / bund= le / SAVPF to a device. I could understand the latency problem argument how= ever, but not the "easy interop" argument which has become a head= ache and forced the SDP API adoption which makes WebRTC much harder than it= could be.

I would argue that SDP adoption = made WebRTC harder to interop, but there is already consensus that SDP shou= ld be used, so there is no point to talk about it anymore.

The arguments why SDES is required in some cases instead of DTLS= are:

1. Additional call setup delay caused by DTL= S

2. High computational load on each call setup. T= his can be significant with high number of short calls being setup. This wo= uld be especially significant for any sort of server interfacing WebRTC or = WebRTC to SIP gateway.

3. High complexity -- you are doubling or tripling amou= nt of code you need in your SRTP stack to support DTLS negotiations. Most o= f the code in readily available libraries is not needed and represents no f= unctional value (certificate support, unneeded encryption methods, compress= ion, streaming, etc), but will require a significant amount of support effo= rt and can be a security risk (I am talking about something like OpenSSL or= GnuTLS which ends up in the media processing stack).

As it stands right now, I would prefer never to use DTL= S-SRTP with any client to server communication applications, since it has n= o security value in such scenarios (server can access media anyway) and wil= l cause significant usability, performance, and support issues.
_____________
Roman Shpount
=A0
--f46d043c819231c18404db474c6a-- From fluffy@cisco.com Fri Apr 26 11:07:51 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0449E21F9A06 for ; Fri, 26 Apr 2013 11:07:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.599 X-Spam-Level: X-Spam-Status: No, score=-110.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RHFeUdgxm5Q6 for ; Fri, 26 Apr 2013 11:07:50 -0700 (PDT) Received: from rcdn-iport-2.cisco.com (rcdn-iport-2.cisco.com [173.37.86.73]) by ietfa.amsl.com (Postfix) with ESMTP id 7A6F321F9A02 for ; Fri, 26 Apr 2013 11:07:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=562; q=dns/txt; s=iport; t=1366999670; x=1368209270; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-id:content-transfer-encoding: mime-version; bh=KW6LgRp2EZvN6F2bdnI2Qw6HO/ocPPQFtR8ePxwkvgc=; b=YuNendi7cDp1/TdWw/yYNgTi97318GiB9TSzvV3jE+qhRjA+WAv7EZVv epYyQKx9HTHj1vnxiDIGv3oj38ide0Wlzy3Q9WTxon7AReAoNCHvKx6P0 eTS1Pi25uX3e6O3wkGj5IrBgNHerMuuBFA4/Q+p5sQRmBVeipogR39nAm s=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AmUFANnBelGtJV2Y/2dsb2JhbABRgwc2gnC7TIEFFnSCHwEBAQMBeQULAgEIIiQyJQIEDgUIiAYGDL8NBI5fAjECBYJtYQOIWp9sgw6CKA X-IronPort-AV: E=Sophos;i="4.87,559,1363132800"; d="scan'208";a="203517073" Received: from rcdn-core-1.cisco.com ([173.37.93.152]) by rcdn-iport-2.cisco.com with ESMTP; 26 Apr 2013 18:07:48 +0000 Received: from xhc-rcd-x11.cisco.com (xhc-rcd-x11.cisco.com [173.37.183.85]) by rcdn-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id r3QI7mIu022783 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Fri, 26 Apr 2013 18:07:48 GMT Received: from xmb-aln-x02.cisco.com ([169.254.5.192]) by xhc-rcd-x11.cisco.com ([173.37.183.85]) with mapi id 14.02.0318.004; Fri, 26 Apr 2013 13:07:48 -0500 From: "Cullen Jennings (fluffy)" To: Tim Panton Thread-Topic: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb Thread-Index: AQHOQqj1h9kUwcnmTkqSKoy7MUL2sw== Date: Fri, 26 Apr 2013 18:07:47 +0000 Message-ID: References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <5179BEEF.4000600@jesup.org> <517A0237.9030008@matthew.at> <517A8248.4020604@matthew.at> <1BF967D4-2EEA-489D-977E-E5D711966753@phonefromhere.com> In-Reply-To: <1BF967D4-2EEA-489D-977E-E5D711966753@phonefromhere.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.20.249.164] Content-Type: text/plain; charset="iso-8859-1" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 18:07:51 -0000 On Apr 26, 2013, at 7:47 AM, Tim Panton wrote: > If anyone still thinks that SDP is just a blob not an API surface, take a= look at the 'reference implementation' of browser to browser interop. > https://code.google.com/p/webrtc-samples/source/browse/trunk/apprtc/index= .html >=20 > I count around 100 lines of javascript munging the SDP. Could you just summarize what the 100 lines do and which theses would be ne= eded for browsers that implemented the drat standards? I'm trying to dig in= to what we need to fix.=20 From fluffy@iii.ca Fri Apr 26 11:23:52 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 03CAF21F9971 for ; Fri, 26 Apr 2013 11:23:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xEhPQjzBiQ1R for ; Fri, 26 Apr 2013 11:23:48 -0700 (PDT) Received: from mxout-07.mxes.net (mxout-07.mxes.net [216.86.168.182]) by ietfa.amsl.com (Postfix) with ESMTP id CD9A921F9901 for ; Fri, 26 Apr 2013 11:23:46 -0700 (PDT) Received: from [192.168.4.100] (unknown [128.107.239.233]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by smtp.mxes.net (Postfix) with ESMTPSA id CB20322E253; Fri, 26 Apr 2013 14:23:40 -0400 (EDT) Content-Type: text/plain; charset=iso-8859-1 Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) From: Cullen Jennings In-Reply-To: Date: Fri, 26 Apr 2013 12:23:40 -0600 Content-Transfer-Encoding: quoted-printable Message-Id: <8AC9604B-CBC7-482E-A60E-0096A45CC9B6@iii.ca> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <5179BEEF.4000600@jesup.org> <517A0237.9030008@matthew.at> To: Ted Hardie X-Mailer: Apple Mail (2.1503) Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 18:23:52 -0000 On Apr 25, 2013, at 11:55 PM, Ted Hardie wrote: > On Thu, Apr 25, 2013 at 9:27 PM, Matthew Kaufman = wrote: > O > Yes, some gateway scenarios might be cheaper/easier with SDES, but I = see the primary use-cases for WebRTC to be browser-to-browser, not = browser-legacy. >=20 > Just because the charter was mistakenly written that way doesn't mean = it is true. >=20 > I remind you that the actual title of the group is: >=20 > "Real-Time Communication in WEB-browsers (rtcweb)". While you may = disagree with the charter, please remember that it's not fundamentally a = prediction about what the eventual balance of flows will be. It's a = statement about where the balance of effort in the group should go. To = me as an individual, it implies that we should not make trade-offs that = optimize a non-browser use case at the expense of the browser use case = except in pretty extraordinary circumstances. >=20 > regards, Ted, I think rtcweb is about a web brewer being able to communicate to = lots of things, not just one currently very small island. Our uses and = discussion from well before this WG was chartered have recognized that = to be successful, rtrcweb endpoints were going to need to be able to = call things other than web browsers. You were one of the people that = pushed hard on the non browser (but also not legacy) uses.=20 I agree with your point that the design of any new communication system = has to deal with the tradeoff between how it work with previous system = and how easy it is to build. However, in the case here, I tend towards = trying to make the a new system that can take advantage of an early = network effect by being able to talk to lots of existing things. I don't = believe that Skype would have reach the penetration it currently has = without PSTN interoperability. I think the same can be said for Google = Voice and WebEx. =20 From tim@phonefromhere.com Fri Apr 26 11:31:15 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E0F0A21F9878 for ; Fri, 26 Apr 2013 11:31:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.574 X-Spam-Level: X-Spam-Status: No, score=-2.574 tagged_above=-999 required=5 tests=[AWL=0.025, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0vPLAkbQrHWV for ; Fri, 26 Apr 2013 11:31:15 -0700 (PDT) Received: from smtp003.apm-internet.net (smtp003.apm-internet.net [85.119.248.52]) by ietfa.amsl.com (Postfix) with ESMTP id DDBEA21F984C for ; Fri, 26 Apr 2013 11:31:14 -0700 (PDT) Received: (qmail 85015 invoked from network); 26 Apr 2013 18:31:13 -0000 X-AV-Scan: clean Received: from unknown (HELO zimbra003.verygoodemail.com) (85.119.248.218) by smtp003.apm-internet.net with SMTP; 26 Apr 2013 18:31:13 -0000 Received: from zimbra003.verygoodemail.com (localhost [127.0.0.1]) by zimbra003.verygoodemail.com (Postfix) with ESMTP id 6EEB518A03A8; Fri, 26 Apr 2013 19:31:13 +0100 (BST) Received: from [192.67.4.33] (unknown [192.67.4.33]) by zimbra003.verygoodemail.com (Postfix) with ESMTPSA id 588AF18A0339; Fri, 26 Apr 2013 19:31:13 +0100 (BST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=iso-8859-1 From: Tim Panton In-Reply-To: Date: Fri, 26 Apr 2013 19:31:12 +0100 Content-Transfer-Encoding: quoted-printable Message-Id: References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <5179BEEF.4000600@jesup.org> <517A0237.9030008@matthew.at> <517A8248.4020604@matthew.at> <1BF967D4-2EEA-489D-977E-E5D711966753@phonefromhere.com> To: "Cullen Jennings (fluffy)" X-Mailer: Apple Mail (2.1283) Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 18:31:16 -0000 On 26 Apr 2013, at 19:07, Cullen Jennings (fluffy) wrote: >=20 > On Apr 26, 2013, at 7:47 AM, Tim Panton wrote: >=20 >> If anyone still thinks that SDP is just a blob not an API surface, = take a look at the 'reference implementation' of browser to browser = interop. >> = https://code.google.com/p/webrtc-samples/source/browse/trunk/apprtc/index.= html >>=20 >> I count around 100 lines of javascript munging the SDP. >=20 > Could you just summarize what the 100 lines do and which theses would = be needed for browsers that implemented the drat standards? I'm trying = to dig into what we need to fix.=20 The bulk of it seems to be there to coerce the browsers to use the = 'best' codec.=20 I see code to remove CN and re-write the m=3D line to get opus as the = first element. I think this represents a class of problem where the web programmer will = want to assert their=20 preferences, and currently SDP munging is the only available API. I personally doubt that any level of standardisation of the SDP will = remove the need for such tweaks. Tim.= From tim@phonefromhere.com Fri Apr 26 11:42:43 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1908F21F985F for ; Fri, 26 Apr 2013 11:42:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.299 X-Spam-Level: X-Spam-Status: No, score=-1.299 tagged_above=-999 required=5 tests=[AWL=-1.256, BAYES_00=-2.599, HTML_MESSAGE=0.001, SARE_OBFU_AMP2B=2.555] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7iH+GssaMkc3 for ; Fri, 26 Apr 2013 11:42:42 -0700 (PDT) Received: from smtp004.apm-internet.net (smtp004.apm-internet.net [85.119.248.54]) by ietfa.amsl.com (Postfix) with ESMTP id 597AE21F9897 for ; Fri, 26 Apr 2013 11:42:41 -0700 (PDT) Received: (qmail 14646 invoked from network); 26 Apr 2013 18:42:33 -0000 X-AV-Scan: clean Received: from unknown (HELO zimbra003.verygoodemail.com) (85.119.248.218) by smtp004.apm-internet.net with SMTP; 26 Apr 2013 18:42:33 -0000 Received: from zimbra003.verygoodemail.com (localhost [127.0.0.1]) by zimbra003.verygoodemail.com (Postfix) with ESMTP id 58C1518A0339; Fri, 26 Apr 2013 19:42:33 +0100 (BST) Received: from [192.67.4.33] (unknown [192.67.4.33]) by zimbra003.verygoodemail.com (Postfix) with ESMTPSA id 32D3918A0410; Fri, 26 Apr 2013 19:42:33 +0100 (BST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: multipart/alternative; boundary="Apple-Mail=_1311BC98-87F7-4533-8790-449A64CAC7C1" From: Tim Panton In-Reply-To: Date: Fri, 26 Apr 2013 19:42:32 +0100 Message-Id: <829F9A35-5F23-4A0F-9831-80478F70965E@phonefromhere.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> <9F33F40F6F2CD847824537F3C4E37DDF0E6C04AF@MCHP04MSX.global-ad.net> <4AA3A95D6033ED488F8AE4E45F47448742B13620@WABOTH9MSGUSR8B.ITServices.sbc.com> To: Roman Shpount X-Mailer: Apple Mail (2.1283) Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 18:42:43 -0000 --Apple-Mail=_1311BC98-87F7-4533-8790-449A64CAC7C1 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 On 26 Apr 2013, at 18:59, Roman Shpount wrote: >=20 > The arguments why SDES is required in some cases instead of DTLS are: >=20 > 1. Additional call setup delay caused by DTLS This is a serious problem - made worse by the O/A semantics - I think we = will find that in real usage sites will pre-warm a DTLS connection so it is ready to go when the user = clicks connect. >=20 > 2. High computational load on each call setup. This can be significant = with high number of short calls being setup. This would be especially = significant for any sort of server interfacing WebRTC or WebRTC to SIP = gateway. I would dispute this - remember exactly the same users have almost = certainly logged into an https:// portal - indeed only a small=20 percentage of them will start a DTLS session for during any given web = session. The web seems to still be working. >=20 > 3. High complexity -- you are doubling or tripling amount of code you = need in your SRTP stack to support DTLS negotiations. Most of the code = in readily available libraries is not needed and represents no = functional value (certificate support, unneeded encryption methods, = compression, streaming, etc), but will require a significant amount of = support effort and can be a security risk (I am talking about something = like OpenSSL or GnuTLS which ends up in the media processing stack). That's true to an extent, but it only applies to devices that don't = already do TLS for something else.=20 Webservers, web browsers, Sip/xmpp engines, anything offering an https = management interface, will already have that code in use for other purposes. The DTLS specific code is quite small.=20 >=20 > As it stands right now, I would prefer never to use DTLS-SRTP with any = client to server communication applications, since it has no security = value in such scenarios (server can access media anyway) and will cause = significant usability, performance, and support issues. There I also disagree. The ability to offer a DTLS connection that = presents a browser checkable x509 certificate for yourbank.com over the media path in a call to a bank's authorized call center agents might be = a significant advantage. T. =20 > _____________ > Roman Shpount > =20 > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb --Apple-Mail=_1311BC98-87F7-4533-8790-449A64CAC7C1 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=iso-8859-1

The arguments why SDES is required in some cases instead of = DTLS are:

1. Additional call setup delay caused = by DTLS

This is a serious = problem - made worse by the O/A semantics - I think we will find that in = real usage
sites will pre-warm a DTLS connection so it is = ready to go when the user clicks connect.


2. High = computational load on each call setup. This can be significant with high = number of short calls being setup. This would be especially significant = for any sort of server interfacing WebRTC or WebRTC to SIP = gateway.

I would dispute = this - remember exactly the same users have almost certainly logged into = an https:// portal - indeed only a small 
percentage of = them will start a DTLS session for during any given web session. The web = seems to still be working.


3. High complexity -- you are doubling or tripling = amount of code you need in your SRTP stack to support DTLS negotiations. = Most of the code in readily available libraries is not needed and = represents no functional value (certificate support, unneeded encryption = methods, compression, streaming, etc), but will require a significant = amount of support effort and can be a security risk (I am talking about = something like OpenSSL or GnuTLS which ends up in the media processing = stack).

That's true to an = extent, but it only applies to devices that don't already do TLS for = something else. 
Webservers, web browsers, Sip/xmpp = engines, anything offering an https management interface, will already = have that code
in use for other purposes. The DTLS specific = code is quite small. 


As it stands right now, I would prefer never to use = DTLS-SRTP with any client to server communication applications, since it = has no security value in such scenarios (server can access media anyway) = and will cause significant usability, performance, and support = issues.

There I also = disagree. The ability to offer a DTLS connection that presents a browser = checkable x509 certificate for yourbank.com over the
media = path in a call to a bank's authorized call center agents might be a = significant = advantage.

T.
 

_____________
Roman Shpount
 
_______________________________________________
rtcweb mailing = list
rtcweb@ietf.org
https://www.ietf.or= g/mailman/listinfo/rtcweb

= --Apple-Mail=_1311BC98-87F7-4533-8790-449A64CAC7C1-- From fluffy@iii.ca Fri Apr 26 11:48:02 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2192321F9926 for ; Fri, 26 Apr 2013 11:48:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id joO-x372S3la for ; Fri, 26 Apr 2013 11:48:01 -0700 (PDT) Received: from mxout-07.mxes.net (mxout-07.mxes.net [216.86.168.182]) by ietfa.amsl.com (Postfix) with ESMTP id 7C36921F991A for ; Fri, 26 Apr 2013 11:48:01 -0700 (PDT) Received: from [192.168.4.100] (unknown [128.107.239.233]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by smtp.mxes.net (Postfix) with ESMTPSA id F319A22E1F3; Fri, 26 Apr 2013 14:47:54 -0400 (EDT) Content-Type: text/plain; charset=iso-8859-1 Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) From: Cullen Jennings In-Reply-To: Date: Fri, 26 Apr 2013 12:47:54 -0600 Content-Transfer-Encoding: quoted-printable Message-Id: <079FA1E8-0247-4ACD-9F71-4FA86E5616E5@iii.ca> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <5179BEEF.4000600@jesup.org> <517A0237.9030008@matthew.at> <517A8248.4020604@matthew.at> <1BF967D4-2EEA-489D-977E-E5D711966753@phonefromhere.com> To: Tim Panton X-Mailer: Apple Mail (2.1503) Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 18:48:02 -0000 On Apr 26, 2013, at 12:31 PM, Tim Panton wrote: >=20 > On 26 Apr 2013, at 19:07, Cullen Jennings (fluffy) wrote: >=20 >>=20 >> On Apr 26, 2013, at 7:47 AM, Tim Panton = wrote: >>=20 >>> If anyone still thinks that SDP is just a blob not an API surface, = take a look at the 'reference implementation' of browser to browser = interop. >>> = https://code.google.com/p/webrtc-samples/source/browse/trunk/apprtc/index.= html >>>=20 >>> I count around 100 lines of javascript munging the SDP. >>=20 >> Could you just summarize what the 100 lines do and which theses would = be needed for browsers that implemented the drat standards? I'm trying = to dig into what we need to fix.=20 >=20 >=20 > The bulk of it seems to be there to coerce the browsers to use the = 'best' codec.=20 > I see code to remove CN and re-write the m=3D line to get opus as the = first element. >=20 > I think this represents a class of problem where the web programmer = will want to assert their=20 > preferences, and currently SDP munging is the only available API. >=20 > I personally doubt that any level of standardisation of the SDP will = remove the need for such tweaks. I think that both Firefox and Chrome would agree with was a bug to = prefer narrowband codecs over wideband codecs. I'd be shocked to = actually see them prefer narrowband over G.711.=20 I think the older version of Chrome prefer some non standard codec over = opus but that could change. Allowing an application to change preference = in that case is a valid reason to munge SDP but not one that most = applications will probably care about. If we want to avoid this type of = SDP munging, we could easily add a constraint to the API that allowed = the application to provide codec preferences along the lines of how = openssl allows one to provide crypto preferences. I would like to point = out that this code makes opus always the preferred which is really bad = for future interoperability. When we come out with opus2, and all the = browsers support it, this code will still be using opus1. So in my = opinion, this code would be better if it did not do this and just let = offer /answer negotiation pick a codec but I digress.=20 If the browsers can't process the SDP with the CN and ignore it, that = seems like a bug.=20 From martin.thomson@gmail.com Fri Apr 26 12:00:43 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5AB2021F99D2 for ; Fri, 26 Apr 2013 12:00:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jKcWNLhpeb7O for ; Fri, 26 Apr 2013 12:00:41 -0700 (PDT) Received: from mail-we0-x232.google.com (mail-we0-x232.google.com [IPv6:2a00:1450:400c:c03::232]) by ietfa.amsl.com (Postfix) with ESMTP id 8472B21F99B3 for ; Fri, 26 Apr 2013 12:00:40 -0700 (PDT) Received: by mail-we0-f178.google.com with SMTP id t11so613151wey.37 for ; Fri, 26 Apr 2013 12:00:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:date:message-id:subject:from:to:cc :content-type; bh=T4R0iLyj56U5+V6vBeHCVq6z5gdyxZ1svQEMIg878Fw=; b=GBKt0b6nHyvjUHFfxfpoFLmYSodn1LNJo+Q6LSYoyg9qsITh65sXVWghnYqZiENM9+ AZaNlcDLIbKPYv9rAW7WOjymGES160lvWITqWko0g+2JPIuTarRCgYmteaXKe4SS9bWr ibeoyjq1KXPcPCtYx3U5PQQmf0kbEArF5MUcierJxTEQJuy4vYJkOONiv4pAIBk6HOFX Ml5/k7uK3rGL6Dvg+3UOTYUj/MuQooAqSsI3ikmxlkdWdPpl8XbC/K+eFeIurjnD4GgO Mc+frHZnrdBUP3caGoB+jv5vK/Ll8cqyRPTLaiGFeQT1s7k/exg9CeOwWomkwWbLj0mG VSdA== MIME-Version: 1.0 X-Received: by 10.194.235.196 with SMTP id uo4mr12217274wjc.30.1367002838902; Fri, 26 Apr 2013 12:00:38 -0700 (PDT) Received: by 10.194.33.102 with HTTP; Fri, 26 Apr 2013 12:00:38 -0700 (PDT) Date: Fri, 26 Apr 2013 12:00:38 -0700 Message-ID: From: Martin Thomson To: "Cullen Jennings (fluffy)" Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" Subject: [rtcweb] My SDP doesn't interoperate X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 19:00:45 -0000 (was Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb) On 26 April 2013 11:07, Cullen Jennings (fluffy) wrote: > > On Apr 26, 2013, at 7:47 AM, Tim Panton wrote: > >> If anyone still thinks that SDP is just a blob not an API surface, take a look at the 'reference implementation' of browser to browser interop. >> https://code.google.com/p/webrtc-samples/source/browse/trunk/apprtc/index.html >> >> I count around 100 lines of javascript munging the SDP. > > Could you just summarize what the 100 lines do and which theses would be needed for browsers that implemented the drat standards? I'm trying to dig into what we need to fix. http://www.webrtc.org/interop That's probably out of date, but you get the idea. From roman@telurix.com Fri Apr 26 12:45:34 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7346C21F9742 for ; Fri, 26 Apr 2013 12:45:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.902 X-Spam-Level: X-Spam-Status: No, score=-1.902 tagged_above=-999 required=5 tests=[AWL=0.075, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id iyfbFwyIjnpi for ; Fri, 26 Apr 2013 12:45:33 -0700 (PDT) Received: from mail-wg0-x22b.google.com (mail-wg0-x22b.google.com [IPv6:2a00:1450:400c:c00::22b]) by ietfa.amsl.com (Postfix) with ESMTP id F30D421F968B for ; Fri, 26 Apr 2013 12:45:32 -0700 (PDT) Received: by mail-wg0-f43.google.com with SMTP id c11so2418505wgh.22 for ; Fri, 26 Apr 2013 12:45:08 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:x-received:in-reply-to:references:date :message-id:subject:from:to:cc:content-type:x-gm-message-state; bh=WZTG8CEDOA8QgvYt3+S73v5G+7HpPyEzriPJzSm4kBo=; b=ZvghDm8w2HsaVORPze4+O8pmXS/XdVg/O1OhF+rXGo6oWwioZMvqR/fW6cTjlFMx16 pyNdtZHvIpFBdjdOw265wQCDvoMvdCZFUBtwSVWh0uJ1U4bS0sYvoX4dsUnWTiDtt0r7 YZtIGty4JMkJQSQU6FtMjVv/HUAqH1aaVnOfy3b2MjY1qVujjiJSMVkVQ7GJwS7MJWUv yVLPmWT8ouC/NcHYLgqu58rtdWjmc393EATogWwq9t4vV1QDs+3/6SXoqOcu8VDjPtbn T437rwfG2+zddEX0w7igGzU48LAVZPv0Y7N8UKQa+8dpwuzolemngy0fn/KmnjYrCvPN Pr5g== X-Received: by 10.194.173.167 with SMTP id bl7mr84772129wjc.50.1367005508335; Fri, 26 Apr 2013 12:45:08 -0700 (PDT) Received: from mail-we0-x22b.google.com (mail-we0-x22b.google.com [2a00:1450:400c:c03::22b]) by mx.google.com with ESMTPSA id dj7sm5509386wib.6.2013.04.26.12.45.04 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 26 Apr 2013 12:45:06 -0700 (PDT) Received: by mail-we0-f171.google.com with SMTP id t57so1892761wey.2 for ; Fri, 26 Apr 2013 12:45:04 -0700 (PDT) MIME-Version: 1.0 X-Received: by 10.180.188.141 with SMTP id ga13mr6228798wic.9.1367005504376; Fri, 26 Apr 2013 12:45:04 -0700 (PDT) Received: by 10.216.204.202 with HTTP; Fri, 26 Apr 2013 12:45:04 -0700 (PDT) In-Reply-To: <829F9A35-5F23-4A0F-9831-80478F70965E@phonefromhere.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> <9F33F40F6F2CD847824537F3C4E37DDF0E6C04AF@MCHP04MSX.global-ad.net> <4AA3A95D6033ED488F8AE4E45F47448742B13620@WABOTH9MSGUSR8B.ITServices.sbc.com> <829F9A35-5F23-4A0F-9831-80478F70965E@phonefromhere.com> Date: Fri, 26 Apr 2013 15:45:04 -0400 Message-ID: From: Roman Shpount To: Tim Panton Content-Type: multipart/alternative; boundary=001a11c37f5a7e9cdf04db48c57b X-Gm-Message-State: ALoCoQl0wOff/cEV/leTjpqYsSxccWUduyjLLtBSMdkZhayjAIf3BTy/vj5W12k3hZNRu+nsTG8H Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 19:45:34 -0000 --001a11c37f5a7e9cdf04db48c57b Content-Type: text/plain; charset=ISO-8859-1 On Fri, Apr 26, 2013 at 2:42 PM, Tim Panton wrote: > > On 26 Apr 2013, at 18:59, Roman Shpount wrote: > > > The arguments why SDES is required in some cases instead of DTLS are: > > 1. Additional call setup delay caused by DTLS > > > This is a serious problem - made worse by the O/A semantics - I think we > will find that in real usage > sites will pre-warm a DTLS connection so it is ready to go when the user > clicks connect. > > Pre-warming connection before user consent has some security implications as well. I would much rather see a mechanism to do ICE setup and DTLS key exchange at the same time. Should we look into extending ICE/STUN to carry public/private key exchange? > > 2. High computational load on each call setup. This can be significant > with high number of short calls being setup. This would be especially > significant for any sort of server interfacing WebRTC or WebRTC to SIP > gateway. > > > I would dispute this - remember exactly the same users have almost > certainly logged into an https:// portal - indeed only a small > percentage of them will start a DTLS session for during any given web > session. The web seems to still be working. > Do you dispute that DTLS key exchange represent additional CPU load? If you dispute that this is additional load is significant, then we can look at what percentage of the CPU load associated with the call it represents. For short calls (10 sec or less) it is going to be a significant portion. This is additional load on the component that is dealing with media, and the fact that client have already done key exchange with the server is not relevant. 3. High complexity -- you are doubling or tripling amount of code you need > in your SRTP stack to support DTLS negotiations. Most of the code in > readily available libraries is not needed and represents no functional > value (certificate support, unneeded encryption methods, compression, > streaming, etc), but will require a significant amount of support effort > and can be a security risk (I am talking about something like OpenSSL or > GnuTLS which ends up in the media processing stack). > > > That's true to an extent, but it only applies to devices that don't > already do TLS for something else. > Webservers, web browsers, Sip/xmpp engines, anything offering an https > management interface, will already have that code > in use for other purposes. The DTLS specific code is quite small. > Once again you are talking about signaling/web interfaces that do not necessarily run on the some network components, ie TLS can be handled by web server and then signaling sent over some other protocol to the media server which will need to support DTLS. Also, in case of web servers there is a way to do the key exchange once per session and reuse TLS connection and exchanged keys for multiple requests between the same client and server. I am not sure there is a mechanism in place to do the same with DTLS key exchanges in media connection. > As it stands right now, I would prefer never to use DTLS-SRTP with any > client to server communication applications, since it has no security value > in such scenarios (server can access media anyway) and will cause > significant usability, performance, and support issues. > > > There I also disagree. The ability to offer a DTLS connection that > presents a browser checkable x509 certificate for yourbank.com over the > media path in a call to a bank's authorized call center agents might be a > significant advantage. > > Do web servers currently validate the remote certificate on DTLS connections? I assume they do not, so there is no way to validate x509 certificate on the media connection. As far as I know we are not even supposed to pass DNS names in SDP, so I am not sure what we will be validating there in the first place. _____________ Roman Shpount --001a11c37f5a7e9cdf04db48c57b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
On Fri, Apr 26, 2013 at 2:42 PM, Tim Panton <tim@phonefromhere.com> wrote:

On 26 A= pr 2013, at 18:59, Roman Shpount wrote:
The arguments why SDES is required in some cases instead of DTLS= are:

1. Additional call setup delay caused by DTL= S

This is a serious probl= em - made worse by the O/A semantics - I think we will find that in real us= age
sites will pre-warm a DTLS connection so it is ready to go when the us= er clicks connect.

=A0
Pre-warming connection before user consent has some se= curity implications as well. I would much rather see a mechanism to do ICE = setup and DTLS key exchange at the same time. Should we look into extending= ICE/STUN to carry public/private key exchange?
2. High computational load on each call setup. This can be significant= with high number of short calls being setup. This would be especially sign= ificant for any sort of server interfacing WebRTC or WebRTC to SIP gateway.=

I would dispute this - remembe= r exactly the same users have almost certainly logged into an https:// port= al - indeed only a small=A0
percentage of them will start a DTLS = session for during any given web session. The web seems to still be working= .

Do you dispute that DTLS key e= xchange represent additional CPU load? If you dispute that this is addition= al load is significant, then we can look at what percentage of the CPU load= associated with the call it represents. For short calls (10 sec or less) i= t is going to be a significant portion. This is additional load on the comp= onent that is dealing with media, and the fact that client have already don= e key exchange with the server is not relevant.

3. High complexity -- you are doubling or tripling amount of code you = need in your SRTP stack to support DTLS negotiations. Most of the code in r= eadily available libraries is not needed and represents no functional value= (certificate support, unneeded encryption methods, compression, streaming,= etc), but will require a significant amount of support effort and can be a= security risk (I am talking about something like OpenSSL or GnuTLS which e= nds up in the media processing stack).

That's true to an extent, = but it only applies to devices that don't already do TLS for something = else.=A0
Webservers, web browsers, Sip/xmpp engines, anything off= ering an https management interface, will already have that code
in use for other purposes. The DTLS specific code is quite small.=A0

Once again you are talking= about signaling/web interfaces that do not=A0necessarily run on the some n= etwork components, ie TLS can be handled by web server and then signaling s= ent over some other protocol to the media server which will need to support= DTLS. Also, in case of web servers there is a way to do the key exchange o= nce per session and reuse TLS connection and exchanged keys for multiple re= quests between the same client and server. I am not sure there is a mechani= sm in place to do the same with DTLS key exchanges in media connection.
=A0
As it stands right now, I would prefer never to use DTLS-SRTP with any clie= nt to server communication applications, since it has no security value in = such scenarios (server can access media anyway) and will cause significant = usability, performance, and support issues.

There I also disagree. The abi= lity to offer a DTLS connection that presents a browser checkable x509 cert= ificate for yourbank.com<= /a> over the
media path in a call to a bank's authorized call center agents mig= ht be a significant advantage.


_____________
Roman Shpount
--001a11c37f5a7e9cdf04db48c57b-- From tim@phonefromhere.com Fri Apr 26 13:10:37 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A82BD21F99A3 for ; Fri, 26 Apr 2013 13:10:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.142 X-Spam-Level: X-Spam-Status: No, score=-1.142 tagged_above=-999 required=5 tests=[AWL=-1.099, BAYES_00=-2.599, HTML_MESSAGE=0.001, SARE_OBFU_AMP2B=2.555] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1Z7LBf7r15bg for ; Fri, 26 Apr 2013 13:10:35 -0700 (PDT) Received: from smtp004.apm-internet.net (smtp004.apm-internet.net [85.119.248.54]) by ietfa.amsl.com (Postfix) with ESMTP id EAD3421F99A0 for ; Fri, 26 Apr 2013 13:10:34 -0700 (PDT) Received: (qmail 44196 invoked from network); 26 Apr 2013 20:10:33 -0000 X-AV-Scan: clean Received: from unknown (HELO zimbra003.verygoodemail.com) (85.119.248.218) by smtp004.apm-internet.net with SMTP; 26 Apr 2013 20:10:33 -0000 Received: from zimbra003.verygoodemail.com (localhost [127.0.0.1]) by zimbra003.verygoodemail.com (Postfix) with ESMTP id 21FE218A03A8; Fri, 26 Apr 2013 21:10:33 +0100 (BST) Received: from [192.67.4.33] (unknown [192.67.4.33]) by zimbra003.verygoodemail.com (Postfix) with ESMTPSA id EFD9B18A0339; Fri, 26 Apr 2013 21:10:32 +0100 (BST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: multipart/alternative; boundary="Apple-Mail=_1A084365-5503-4AAA-A40E-E0A0B93E3C8A" From: Tim Panton In-Reply-To: Date: Fri, 26 Apr 2013 21:10:32 +0100 Message-Id: <6AB4D870-571E-45CF-AA19-A1D12C7E91CC@phonefromhere.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> <9F33F40F6F2CD847824537F3C4E37DDF0E6C04AF@MCHP04MSX.global-ad.net> <4AA3A95D6033ED488F8AE4E45F47448742B13620@WABOTH9MSGUSR8B.ITServices.sbc.com> <829F9A35-5F23-4A0F-9831-80478F70965E@phonefromhere.com> To: Roman Shpount X-Mailer: Apple Mail (2.1283) Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 20:10:37 -0000 --Apple-Mail=_1A084365-5503-4AAA-A40E-E0A0B93E3C8A Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 On 26 Apr 2013, at 20:45, Roman Shpount wrote: > On Fri, Apr 26, 2013 at 2:42 PM, Tim Panton = wrote: >=20 > On 26 Apr 2013, at 18:59, Roman Shpount wrote: >>=20 >> The arguments why SDES is required in some cases instead of DTLS are: >>=20 >> 1. Additional call setup delay caused by DTLS >=20 > This is a serious problem - made worse by the O/A semantics - I think = we will find that in real usage > sites will pre-warm a DTLS connection so it is ready to go when the = user clicks connect. >=20 > =20 > Pre-warming connection before user consent has some security = implications as well. I would much rather see a mechanism to do ICE = setup and DTLS key exchange at the same time. Should we look into = extending ICE/STUN to carry public/private key exchange? That's interesting, I'd have to have a _long_ talk with ekr about the = security risks in that. >>=20 >> 2. High computational load on each call setup. This can be = significant with high number of short calls being setup. This would be = especially significant for any sort of server interfacing WebRTC or = WebRTC to SIP gateway. >=20 > I would dispute this - remember exactly the same users have almost = certainly logged into an https:// portal - indeed only a small=20 > percentage of them will start a DTLS session for during any given web = session. The web seems to still be working. >=20 > Do you dispute that DTLS key exchange represent additional CPU load? = If you dispute that this is additional load is significant, then we can = look at what percentage of the CPU load associated with the call it = represents. For short calls (10 sec or less) it is going to be a = significant portion. This is additional load on the component that is = dealing with media, and the fact that client have already done key = exchange with the server is not relevant. Sorry , I wasn't clear. My point was that there exists a class of = application that sets up more TLS connections per second and finds the = cpu load=20 acceptable. - Webservers.=20 >=20 >> 3. High complexity -- you are doubling or tripling amount of code you = need in your SRTP stack to support DTLS negotiations. Most of the code = in readily available libraries is not needed and represents no = functional value (certificate support, unneeded encryption methods, = compression, streaming, etc), but will require a significant amount of = support effort and can be a security risk (I am talking about something = like OpenSSL or GnuTLS which ends up in the media processing stack). >=20 > That's true to an extent, but it only applies to devices that don't = already do TLS for something else.=20 > Webservers, web browsers, Sip/xmpp engines, anything offering an https = management interface, will already have that code > in use for other purposes. The DTLS specific code is quite small.=20 >=20 > Once again you are talking about signaling/web interfaces that do not = necessarily run on the some network components, ie TLS can be handled by = web server and then signaling sent over some other protocol to the media = server which will need to support DTLS. Again I wasn't clear. I was talking about your concern about adding = large swathes of new code to the device's codebase just for DTLS.=20 My point was that if the device has a secure management interface then = the huge bulk of that code is probably already on there - being used to set up TLS connections. I wasn't thinking about reuse of the data or keys, just the compiled = code. > Also, in case of web servers there is a way to do the key exchange = once per session and reuse TLS connection and exchanged keys for = multiple requests between the same client and server. I am not sure = there is a mechanism in place to do the same with DTLS key exchanges in = media connection. Again, that is an interesting optimization that should probably be = applied - how long should a DTLS session be kept around on the = off-chance that the same connection will be re-made?=20 > =20 >> As it stands right now, I would prefer never to use DTLS-SRTP with = any client to server communication applications, since it has no = security value in such scenarios (server can access media anyway) and = will cause significant usability, performance, and support issues. >=20 > There I also disagree. The ability to offer a DTLS connection that = presents a browser checkable x509 certificate for yourbank.com over the > media path in a call to a bank's authorized call center agents might = be a significant advantage. >=20 >=20 > Do web servers currently validate the remote certificate on DTLS = connections? I assume they do not, so there is no way to validate x509 = certificate on the media connection. As far as I know we are not even = supposed to pass DNS names in SDP, so I am not sure what we will be = validating there in the first place. The browser could validate the certificate that was offered over the = media channel. That validation would be based on it's existing CA roots. = (as used=20 to validate TLS certs - but in this case the cert is offered by the = media server, not the web server).=20 Tim. --Apple-Mail=_1A084365-5503-4AAA-A40E-E0A0B93E3C8A Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=iso-8859-1
On Fri, Apr 26, 2013 at 2:42 PM, Tim Panton <tim@phonefromhere.com> = wrote:

On = 26 Apr 2013, at 18:59, Roman Shpount wrote:
The arguments why SDES is required in some cases instead of = DTLS are:

1. Additional call setup delay caused = by DTLS

This is a = serious problem - made worse by the O/A semantics - I think we will find = that in real usage
sites will pre-warm a DTLS connection so it is ready to go when the = user clicks connect.

 
Pre-= warming connection before user consent has some security implications as = well. I would much rather see a mechanism to do ICE setup and DTLS key = exchange at the same time. Should we look into extending ICE/STUN to = carry public/private key = exchange?

That's = interesting, I'd have to have a _long_ talk with ekr about the security = risks in that.


2. High computational load on each call setup. This can be = significant with high number of short calls being setup. This would be = especially significant for any sort of server interfacing WebRTC or = WebRTC to SIP gateway.

I would dispute this - = remember exactly the same users have almost certainly logged into an = https:// portal - indeed only a small 
percentage of them = will start a DTLS session for during any given web session. The web = seems to still be working.

Do you dispute that DTLS = key exchange represent additional CPU load? If you dispute that this is = additional load is significant, then we can look at what percentage of = the CPU load associated with the call it represents. For short calls (10 = sec or less) it is going to be a significant portion. This is additional = load on the component that is dealing with media, and the fact that = client have already done key exchange with the server is not = relevant.

Sorry , I wasn't = clear. My point was that there exists a class of application that sets = up more TLS connections per second and finds the cpu = load 
acceptable. - = Webservers. 


3. High complexity -- you are doubling or tripling amount of code = you need in your SRTP stack to support DTLS negotiations. Most of the = code in readily available libraries is not needed and represents no = functional value (certificate support, unneeded encryption methods, = compression, streaming, etc), but will require a significant amount of = support effort and can be a security risk (I am talking about something = like OpenSSL or GnuTLS which ends up in the media processing = stack).

That's true to an extent, = but it only applies to devices that don't already do TLS for something = else. 
Webservers, web browsers, Sip/xmpp engines, = anything offering an https management interface, will already have that = code
in use for other purposes. The DTLS specific code is quite = small. 

Once = again you are talking about signaling/web interfaces that do = not necessarily run on the some network components, ie TLS can be = handled by web server and then signaling sent over some other protocol = to the media server which will need to support DTLS. =

Again I wasn't clear. I was = talking about your concern about adding large swathes of new code to the = device's codebase just for DTLS. 
My point was = that if the device has a secure management interface then the huge = bulk of that code is probably already on there
- being used to = set up TLS connections.
I wasn't thinking about reuse of the = data or keys, just the compiled code.

Also, in case of web = servers there is a way to do the key exchange once per session and reuse = TLS connection and exchanged keys for multiple requests between the same = client and server. I am not sure there is a mechanism in place to do the = same with DTLS key exchanges in media = connection.

Again, that is = an interesting optimization that should probably be applied - how long = should a DTLS session be kept around on the off-chance = that
the same connection will be = re-made? 

 
As it stands right now, I would prefer never to use DTLS-SRTP with any = client to server communication applications, since it has no security = value in such scenarios (server can access media anyway) and will cause = significant usability, performance, and support issues.

There I also disagree. The = ability to offer a DTLS connection that presents a browser checkable = x509 certificate for yourbank.com over the
media path in a call to a bank's authorized call center agents = might be a significant = advantage.


Do web servers currently validate the remote certificate on DTLS = connections? I assume they do not, so there is no way to validate x509 = certificate on the media connection. As far as I know we are not even = supposed to pass DNS names in SDP, so I am not sure what we will be = validating there in the first = place.

The browser could = validate the certificate that was offered over the media channel. That = validation would be based on it's existing CA roots. (as = used 
to validate TLS certs - but in this case the cert is = offered by the media server, not the web = server). 


Tim.

=
= --Apple-Mail=_1A084365-5503-4AAA-A40E-E0A0B93E3C8A-- From martin.thomson@gmail.com Fri Apr 26 13:21:46 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C201021F989C for ; Fri, 26 Apr 2013 13:21:46 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0MCyy2XjiOXd for ; Fri, 26 Apr 2013 13:21:46 -0700 (PDT) Received: from mail-we0-x22c.google.com (mail-we0-x22c.google.com [IPv6:2a00:1450:400c:c03::22c]) by ietfa.amsl.com (Postfix) with ESMTP id 143E821F965C for ; Fri, 26 Apr 2013 13:21:02 -0700 (PDT) Received: by mail-we0-f172.google.com with SMTP id r3so3955326wey.17 for ; Fri, 26 Apr 2013 13:20:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=Kr0Z67sZiGnvBEiI7NOao0k+uN1IFZFpzTsrwmbRXLc=; b=NktcWkYWEENC2d7aoTMK+8qQDkaftZneHpyz4gpsJ1J+yQw35agQ5/robU+5BJw03V 6d32EUQOKvNUq44xZwPeC02xiUg59FLHFhcjg3X6xEx3zK8kIIxzSKZQE4IUhI0URzvZ Xjes5v+X6IsmQKhHmRDOxFLyuvbGwtBuO8GMAkwMkjiKaPxx0yeXxmTOke1/YZy7v0mu 2HKmmYzmlRoRLMYWvLBhQwZA0OD43r7jm2rU+562p/Dv8rJEAIVPu/HwnsUVtyUyQvj6 px+tIdPH04NbLU2eBrd+H1Sekf2AlM5nKyHaUfUFBkdUMeOyDJnzgwYouyS0SPUkEa7y NcJw== MIME-Version: 1.0 X-Received: by 10.194.109.227 with SMTP id hv3mr20415675wjb.32.1367007649552; Fri, 26 Apr 2013 13:20:49 -0700 (PDT) Received: by 10.194.33.102 with HTTP; Fri, 26 Apr 2013 13:20:48 -0700 (PDT) In-Reply-To: <6AB4D870-571E-45CF-AA19-A1D12C7E91CC@phonefromhere.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> <9F33F40F6F2CD847824537F3C4E37DDF0E6C04AF@MCHP04MSX.global-ad.net> <4AA3A95D6033ED488F8AE4E45F47448742B13620@WABOTH9MSGUSR8B.ITServices.sbc.com> <829F9A35-5F23-4A0F-9831-80478F70965E@phonefromhere.com> <6AB4D870-571E-45CF-AA19-A1D12C7E91CC@phonefromhere.com> Date: Fri, 26 Apr 2013 13:20:48 -0700 Message-ID: From: Martin Thomson To: Tim Panton Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 20:21:47 -0000 On 26 April 2013 13:10, Tim Panton wrote: > On 26 Apr 2013, at 20:45, Roman Shpount wrote: >> Pre-warming connection before user consent has some security implications as >> well. I would much rather see a mechanism to do ICE setup and DTLS key >> exchange at the same time. Should we look into extending ICE/STUN to carry >> public/private key exchange? > > > That's interesting, I'd have to have a _long_ talk with ekr about the > security risks in that. That the essence of http://tools.ietf.org/html/draft-thomson-rtcweb-ice-dtls-00 In theory, it's possible to squash ICE and DTLS to save round trips. In practice, it mucks with software layering in nasty ways. From ekr@rtfm.com Fri Apr 26 16:41:01 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4501921F8EB9 for ; Fri, 26 Apr 2013 16:41:01 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -99.537 X-Spam-Level: X-Spam-Status: No, score=-99.537 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, MIME_QP_LONG_LINE=1.396, SARE_RECV_SPAM_DOMN0b=1.666, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ALtmarJ3AF-y for ; Fri, 26 Apr 2013 16:41:00 -0700 (PDT) Received: from mail-da0-x232.google.com (mail-da0-x232.google.com [IPv6:2607:f8b0:400e:c00::232]) by ietfa.amsl.com (Postfix) with ESMTP id 9F10221F8E93 for ; Fri, 26 Apr 2013 16:41:00 -0700 (PDT) Received: by mail-da0-f50.google.com with SMTP id a4so2126483dad.9 for ; Fri, 26 Apr 2013 16:41:00 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:references:mime-version:in-reply-to:content-type :content-transfer-encoding:message-id:cc:x-mailer:from:subject:date :to:x-gm-message-state; bh=ORD9Qz4uPjxlrKwilUHlmmk5Tgk50yS2HDB/j96GOq4=; b=DOMBujJJrPzI0uc4pu9oKkFvN/Khw9KQi8VXh8PZi6sLMKZ5gWgvViMKMP1EaEJe93 UJExZvbbRK+j+r3xdjk9TwF9eOWbhPkZcactzhRB6e2XGmJrBEXZd3ALD5DP1n4qTWi8 ixELOC9Y7jEisaUpLi0mJcCkTrAI+M3J6WgtQk00WJKRR6wvuXFOgpHMCGeBwKMM9K1d CmhFuNhvnqL6cB8cCP/8e4vMiX5lHFoIWJB7N83Z2GG8Q7II55KkG9rc/CL2UmAHBasW YZMHuP+bAfP0fiPgPZwbBCFqNLB8qWbAMCSCHoVrcKentaheij8F4awlS+ifYra2nffQ Mkcw== X-Received: by 10.68.195.103 with SMTP id id7mr60635556pbc.56.1367019660443; Fri, 26 Apr 2013 16:41:00 -0700 (PDT) Received: from [220.139.69.166] (220-139-69-166.dynamic.hinet.net. [220.139.69.166]) by mx.google.com with ESMTPSA id ya4sm13418744pbb.24.2013.04.26.16.40.57 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 26 Apr 2013 16:40:59 -0700 (PDT) References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> Mime-Version: 1.0 (1.0) In-Reply-To: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Message-Id: X-Mailer: iPhone Mail (10B329) From: Eric Rescorla Date: Sat, 27 Apr 2013 07:40:54 +0800 To: Roman Shpount X-Gm-Message-State: ALoCoQkWtVlKlSyYww3YwOQmk/kY5oiA2RONJQtsQPUlrYhPVdqf5HLT1AdUdOiFyutpXxVSn9dC Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Apr 2013 23:41:01 -0000 On Apr 27, 2013, at 0:53, Roman Shpount wrote: > Have anybody tried an international call with ICE and DTLS enabled? The ca= ll setup delay introduced by the combination of the two is long enough to go= from being simply annoying to the point of other person hanging up assuming= the call is not working.=20 > _____________ Funny you should ask. I'm in Taipei now and did a call to Texas from my hote= l this morning and call setup time was fine. With that said I have seen wildly varying call setup times with the same mac= hines and software on the same network setup, so no doubt there are still so= me lurking bugs. If you can capture traces of long setup times with Firefox o= r Chrome I would certainly be interested in investigating. Ekr > Roman Shpount >=20 > =20 > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From salvatore.loreto@ericsson.com Sat Apr 27 07:01:11 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F28A521F986A for ; Sat, 27 Apr 2013 07:01:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.249 X-Spam-Level: X-Spam-Status: No, score=-106.249 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HELO_EQ_SE=0.35, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rjnwRiZpXWJj for ; Sat, 27 Apr 2013 07:01:10 -0700 (PDT) Received: from mailgw2.ericsson.se (mailgw2.ericsson.se [193.180.251.37]) by ietfa.amsl.com (Postfix) with ESMTP id 012B021F9855 for ; Sat, 27 Apr 2013 07:01:03 -0700 (PDT) X-AuditID: c1b4fb25-b7f366d000004d10-87-517bda1e4ef0 Received: from esessmw0184.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw2.ericsson.se (Symantec Mail Security) with SMTP id 02.D0.19728.E1ADB715; Sat, 27 Apr 2013 16:01:02 +0200 (CEST) Received: from mail.lmf.ericsson.se (153.88.115.8) by esessmw0184.eemea.ericsson.se (153.88.115.82) with Microsoft SMTP Server id 8.3.279.1; Sat, 27 Apr 2013 16:01:02 +0200 Received: from nomadiclab.lmf.ericsson.se (nomadiclab.lmf.ericsson.se [131.160.33.3]) by mail.lmf.ericsson.se (Postfix) with ESMTP id CC558237B for ; Sat, 27 Apr 2013 17:01:01 +0300 (EEST) Received: from nomadiclab.lmf.ericsson.se (localhost [127.0.0.1]) by nomadiclab.lmf.ericsson.se (Postfix) with ESMTP id 398F754D2B for ; Sat, 27 Apr 2013 17:01:01 +0300 (EEST) Received: from Salvatore-Loretos-MacBook-Pro.local (localhost [127.0.0.1]) by nomadiclab.lmf.ericsson.se (Postfix) with ESMTP id E504054CFC for ; Sat, 27 Apr 2013 17:01:00 +0300 (EEST) Message-ID: <517BDA1D.6090800@ericsson.com> Date: Sat, 27 Apr 2013 17:01:01 +0300 From: Salvatore Loreto User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> In-Reply-To: Content-Type: multipart/alternative; boundary="------------020501090007060108000802" X-Virus-Scanned: ClamAV using ClamSMTP X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrBLMWRmVeSWpSXmKPExsUyM+Jvra7crepAg5WfrSzW/mtnd2D0WLLk J1MAYxSXTUpqTmZZapG+XQJXxudlL5gKuuIqOlcWNTCuc+1i5OSQEDCRmHzlOwuELSZx4d56 ti5GLg4hgVOMEm82NrJAOBsYJU7/nsYI4VxklHi9aTGUc4RRYuaun2wg/UICZxkltt7MBbF5 BbQlVrddZQSxWQRUJd4vms8KYrMJmEk8f7iFuYuRg0NUIFni/w5viHJBiZMzn4CdISIgLLH1 VS8TiC0s4CrxsGM9O9RiJomPx4+DzeEUCJQ4+LwBbC+zQJjEn8ufGSF+UJO4em4TM8Q9WhK9 ZzuZJjAKz0KyYxaSFgjbVuLCnOtQcXmJ5q2zmSFsXYkL/6fAxbe/ncO8gJFtFSN7bmJmTnq5 0SZGYOgf3PJbdQfjnXMihxilOViUxHlnSFUGCgmkJ5akZqemFqQWxReV5qQWH2Jk4uCUamA0 1aoSkF0ax7zwsrL5JaeF7nmP/GxPx06YH31AnXfz/LVxd5LuLug8O3ln/LGd932vcfz+J6Zr a6vTsCv6+4f1jDOYUkq2Wa/8V8C2VlG36WtdqV/EoyOKgS/TE5JWyCtMd7HqM79Q8tw/RHxK 3Mm0QzGzjGwfb17RYXG45p3EXov9fwv4zp1WYinOSDTUYi4qTgQAlFNBJksCAAA= Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 27 Apr 2013 14:01:11 -0000 --------------020501090007060108000802 Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 8bit I am also puzzled about the request for SDES also in DataChannel. /Salvatore On 4/26/13 2:35 PM, Iñaki Baz Castillo wrote: > > SDES is obviously requested for legacy interop at RTP layer. Why do we > need SDES in DataChannel if this is a complete new technology? > > -- > Iñaki Baz Castillo > > > > El 25/04/2013 23:55, "Ejzak, Richard P (Richard)" > > escribió: > > I also agree that we should support SDES in addition to DTLS-SRTP. > > This raises a further question about SCTP/DTLS for DataChannels. > It seems that if we support SDES-SRTP, don't we also need to > provide an SDES keying mechanism for DataChannels? Ekr: What is > needed to realize this? > > Richard Ejzak > > > -----Original Message----- > > From: rtcweb-bounces@ietf.org > [mailto:rtcweb-bounces@ietf.org ] On > > Behalf Of Matthew Kaufman (SKYPE) > > Sent: Thursday, April 25, 2013 3:28 PM > > To: Bogineni, Kalyani; 'Cullen Jennings'; rtcweb@ietf.org > > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and > RTCWeb > > > > I agree. The ability to set the cipher suite and keys from > JavaScript > > is critical for certain applications. SDES is the best we'll get > with > > SDP as the API. DTLS-SRTP-only would be unacceptably limiting. > > > > Matthew Kaufman > > > > > -----Original Message----- > > > From: rtcweb-bounces@ietf.org > [mailto:rtcweb-bounces@ietf.org ] On > > > Behalf Of Bogineni, Kalyani > > > Sent: Thursday, April 25, 2013 1:21 PM > > > To: 'Cullen Jennings'; rtcweb@ietf.org > > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and > RTCWeb > > > > > > We would like to support the use of SDES as a keying method for > > WebRTC. > > > > > > Kalyani Bogineni > > > Verizon > > > > > > -----Original Message----- > > > From: rtcweb-bounces@ietf.org > [mailto:rtcweb-bounces@ietf.org ] On > > > Behalf Of Cullen Jennings > > > Sent: Thursday, April 25, 2013 11:57 AM > > > To: rtcweb@ietf.org > > > Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > > > > > > The working groups committed some time ago to have a further > > > discussion on whether SDP Security Descriptions (RFC 4568 aka > SDES) > > > would be usable as a keying method for WebRTC. As we prepare for > > that > > > discussion, we'd like to have expressions of interest or > support for > > > that approach which indicate the general outlines of support > > proposed. > > > If you wish to make such an expression of support, please send > it to > > the chairs or the list. > > > > > > Cullen, Magnus, & Ted > > > > > > > > > _______________________________________________ > > > rtcweb mailing list > > > rtcweb@ietf.org > > > https://www.ietf.org/mailman/listinfo/rtcweb > > > _______________________________________________ > > > rtcweb mailing list > > > rtcweb@ietf.org > > > https://www.ietf.org/mailman/listinfo/rtcweb > > > > _______________________________________________ > > rtcweb mailing list > > rtcweb@ietf.org > > https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb --------------020501090007060108000802 Content-Type: text/html; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit

I am also puzzled about the request for SDES also in DataChannel.

/Salvatore

On 4/26/13 2:35 PM, Iñaki Baz Castillo wrote:

SDES is obviously requested for legacy interop at RTP layer. Why do we need SDES in DataChannel if this is a complete new technology?

--
Iñaki Baz Castillo
<ibc@aliax.net>

El 25/04/2013 23:55, "Ejzak, Richard P (Richard)" <richard.ejzak@alcatel-lucent.com> escribió:
I also agree that we should support SDES in addition to DTLS-SRTP.

This raises a further question about SCTP/DTLS for DataChannels.  It seems that if we support SDES-SRTP, don't we also need to provide an SDES keying mechanism for DataChannels?  Ekr: What is needed to realize this?

Richard Ejzak

> -----Original Message-----
> From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On
> Behalf Of Matthew Kaufman (SKYPE)
> Sent: Thursday, April 25, 2013 3:28 PM
> To: Bogineni, Kalyani; 'Cullen Jennings'; rtcweb@ietf.org
> Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb
>
> I agree. The ability to set the cipher suite and keys from JavaScript
> is critical for certain applications. SDES is the best we'll get with
> SDP as the API. DTLS-SRTP-only would be unacceptably limiting.
>
> Matthew Kaufman
>
> > -----Original Message-----
> > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On
> > Behalf Of Bogineni, Kalyani
> > Sent: Thursday, April 25, 2013 1:21 PM
> > To: 'Cullen Jennings'; rtcweb@ietf.org
> > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb
> >
> > We would like to support the use of SDES as a keying method for
> WebRTC.
> >
> > Kalyani Bogineni
> > Verizon
> >
> > -----Original Message-----
> > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On
> > Behalf Of Cullen Jennings
> > Sent: Thursday, April 25, 2013 11:57 AM
> > To: rtcweb@ietf.org
> > Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb
> >
> >
> > The working groups committed some time ago to have a further
> > discussion on whether SDP Security Descriptions (RFC 4568 aka SDES)
> > would be usable as a keying method for WebRTC.  As we prepare for
> that
> > discussion, we'd like to have expressions of interest or support for
> > that approach which indicate the general outlines of support
> proposed.
> > If you wish to make such an expression of support, please send it to
> the chairs or the list.
> >
> > Cullen, Magnus, & Ted <The Chairs>
> >
> >
> > _______________________________________________
> > rtcweb mailing list
> > rtcweb@ietf.org
> > https://www.ietf.org/mailman/listinfo/rtcweb
> > _______________________________________________
> > rtcweb mailing list
> > rtcweb@ietf.org
> > https://www.ietf.org/mailman/listinfo/rtcweb
>
> _______________________________________________
> rtcweb mailing list
> rtcweb@ietf.org
> https://www.ietf.org/mailman/listinfo/rtcweb
_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
https://www.ietf.org/mailman/listinfo/rtcweb


_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
https://www.ietf.org/mailman/listinfo/rtcweb


--------------020501090007060108000802-- From christer.holmberg@ericsson.com Sat Apr 27 07:17:18 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6DB4221F98A1 for ; Sat, 27 Apr 2013 07:17:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.449 X-Spam-Level: X-Spam-Status: No, score=-5.449 tagged_above=-999 required=5 tests=[AWL=0.499, BAYES_00=-2.599, HELO_EQ_SE=0.35, HTML_MESSAGE=0.001, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mSML1Nt0GwPk for ; Sat, 27 Apr 2013 07:17:17 -0700 (PDT) Received: from mailgw2.ericsson.se (mailgw2.ericsson.se [193.180.251.37]) by ietfa.amsl.com (Postfix) with ESMTP id 3050721F98A2 for ; Sat, 27 Apr 2013 07:17:17 -0700 (PDT) X-AuditID: c1b4fb25-b7f366d000004d10-08-517bddecbab3 Received: from ESESSHC011.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw2.ericsson.se (Symantec Mail Security) with SMTP id C1.51.19728.CEDDB715; Sat, 27 Apr 2013 16:17:16 +0200 (CEST) Received: from ESESSMB209.ericsson.se ([169.254.9.167]) by ESESSHC011.ericsson.se ([153.88.183.51]) with mapi id 14.02.0328.009; Sat, 27 Apr 2013 16:17:15 +0200 From: Christer Holmberg To: =?iso-8859-1?Q?I=C3=B1aki_Baz_Castillo?= , Tim Panton Thread-Topic: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb Thread-Index: AQHOQc2dBvHgQupeBUKbTywOt/T6cpjnAcgAgABdtoCAAOBNgIAAG7QAgAAAtICAAcQHzg== Date: Sat, 27 Apr 2013 14:17:15 +0000 Message-ID: <7594FB04B1934943A5C02806D1A2204B1C363631@ESESSMB209.ericsson.se> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> <91B4F744-2201-4361-A8D8-7D36F47B865C@cisco.com> <95219856-8365-4A7E-BD0B-4EECE8868498@phonefromhere.com>, In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-Type: multipart/alternative; boundary="_000_7594FB04B1934943A5C02806D1A2204B1C363631ESESSMB209erics_" MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrELMWRmVeSWpSXmKPExsUyM+Jvre6bu9WBBs2rxCym77OxWPuvnd3i 4vZbjA7MHuca3rN7LFnyk8ljyaRGtgDmKC6blNSczLLUIn27BK6MD/uesRccla+43DCHvYHx uVQXIyeHhICJxLn9i9ggbDGJC/fWA9lcHEIChxklFnR2MUE4SxglmtuesXQxcnCwCVhIdP/T BmkQEUiSWLd2FTuIzSygKnH+0DlGEFtYwFXiYcd6dogaN4nmTS3MEHaYRMehx2A1LED1zVuu MIHYvAK+EpNO3GeF2PWMSeLt5EmsIAlOgUCJXYcbwBoYga77fmoNE8QycYlbT+YzQVwtILFk z3lmCFtU4uXjf6wQNfkS96d9Y4NYIChxcuYTlgmMIrOQtM9CUjYLSRlEXE/ixtQpbBC2tsSy ha+ZIWxdiRn/DrEgiy9gZF/FyJ6bmJmTXm60iREYTwe3/FbdwXjnnMghRmkOFiVx3hlSlYFC AumJJanZqakFqUXxRaU5qcWHGJk4OKUaGKeKnFdR+eHoc/b49NhoCd/6XRxSPzJV6jzkCuS3 v12qpKma1j5j2y3m/scm9WsMuJUT9sSuLY/Ojd1SENK88Hb6wy0z9n9fsfX6tVr+AP0Nu1J8 w5p4n0SIN5bNsJSeodq75afk0xke3H/cX1269npv7v9O3bcpq5MirM/q2phvZT24tDGwXoml OCPRUIu5qDgRAHgw0C91AgAA Cc: "rtcweb_ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 27 Apr 2013 14:17:18 -0000 --_000_7594FB04B1934943A5C02806D1A2204B1C363631ESESSMB209erics_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, As I've mentioned before, we should really try to avoid solutions that requ= ire intermediaries to send reINVITEs - or, more general, send SDP offers. Regards, Christer Sent from Windows using TouchDown (www.nitrodesk.com) -----Original Message----- From: I=C3=B1aki Baz Castillo [ibc@aliax.net] To: Tim Panton [tim@phonefromhere.com] CC: rtcweb@ietf.org [rtcweb@ietf.org] Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb The problem is when EKT is also used and the gateway must send SIP reINVITE= by itself as the proposed "solution diagram" shows. That is not just a med= ia gateway. -- I=F1aki Baz Castillo > El 26/04/2013 15:16, "Tim Panton" > escribi=F3: On 26 Apr 2013, at 12:37, I=F1aki Baz Castillo wrote: Such a solution requires a very expensive gateway. Good for vendors but bad= for all the rest. I don't understand why the DTLS gateway would be so expensive. It is _exact= ly_ the same (conceptually) as the ICE processing - you filter off a few UDP packets fro= m the stream, do some stuff, send replies then once you are happy you punt some dynamic settings = back up to the (s)rtp layer. T. --_000_7594FB04B1934943A5C02806D1A2204B1C363631ESESSMB209erics_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi,
 
As I've mentioned before, we should really try to avoid solutions that= require intermediaries to send reINVITEs - or, more general, send SDP offe= rs.
 
Regards,
 
Christer

Sent from Windows using TouchDown= (www.nitrodesk.com)

-----Original Message-----
From: I=C3=B1aki Baz Castillo [ibc@aliax.net]
To: Tim Panton [tim@phonefromhere.com]
CC: rtcweb@ietf.org [rtcweb@ietf.org]
Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWe= b

The problem is when EKT is also used and the gateway must se= nd SIP reINVITE by itself as the proposed "solution diagram" show= s. That is not just a media gateway.

--
I=F1aki Baz Castillo
<ibc@aliax.net>

El 26/04/2013 15:16, "Tim Panton" <= tim@phonefromhere.com> escr= ibi=F3:

On 26 Apr 2013, at 12:37, I=F1aki Baz Castillo wrote:

Such a solution requires a very expensive gateway. Good for = vendors but bad for all the rest.


I don't understand why the DTLS gateway would be so expensive. It is _= exactly_ the same 
(conceptually) as the ICE processing - you filter off a few UDP packet= s from the stream, do some
stuff, send replies then once you are happy you punt some dynamic sett= ings back up to the (s)rtp 
layer.

T.

--_000_7594FB04B1934943A5C02806D1A2204B1C363631ESESSMB209erics_-- From bernard_aboba@hotmail.com Sat Apr 27 08:52:53 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3B42321F974B for ; Sat, 27 Apr 2013 08:52:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.598 X-Spam-Level: X-Spam-Status: No, score=-102.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3tO7zAkY0XB5 for ; Sat, 27 Apr 2013 08:52:52 -0700 (PDT) Received: from blu0-omc3-s6.blu0.hotmail.com (blu0-omc3-s6.blu0.hotmail.com [65.55.116.81]) by ietfa.amsl.com (Postfix) with ESMTP id F1A5521F973A for ; Sat, 27 Apr 2013 08:52:51 -0700 (PDT) Received: from BLU402-EAS172 ([65.55.116.74]) by blu0-omc3-s6.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Sat, 27 Apr 2013 08:52:51 -0700 X-EIP: [4l9WrSocN9TpEnUDmO284rZg0z3mN0M5] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: multipart/related; boundary="_330b85ef-59f1-4a1e-8e0f-117305bbe92b_" Date: Sat, 27 Apr 2013 08:52:47 -0700 From: Bernard Aboba To: Salvatore Loreto MIME-Version: 1.0 X-OriginalArrivalTime: 27 Apr 2013 15:52:51.0376 (UTC) FILETIME=[45E2AB00:01CE435F] Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 27 Apr 2013 15:52:53 -0000 --_330b85ef-59f1-4a1e-8e0f-117305bbe92b_ Content-Type: multipart/alternative; boundary="_354ce0b6-6fdb-4ae3-9390-8518a57e959b_" --_354ce0b6-6fdb-4ae3-9390-8518a57e959b_ Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" I don't understand it either. Salvatore Loreto wrote: I am also puzzled about the request for SDES also in DataChannel. /Salvatore On 4/26/13 2:35 PM=2C I=C3=B1aki Baz Castillo wrote: > > SDES is obviously requested for legacy interop at RTP layer. Why do we > need SDES in DataChannel if this is a complete new technology? > > -- > I=C3=B1aki Baz Castillo > > > > El 25/04/2013 23:55=2C "Ejzak=2C Richard P (Richard)" > > escribi=C3=B3: > > I also agree that we should support SDES in addition to DTLS-SRTP. > > This raises a further question about SCTP/DTLS for DataChannels. > It seems that if we support SDES-SRTP=2C don't we also need to > provide an SDES keying mechanism for DataChannels? Ekr: What is > needed to realize this? > > Richard Ejzak > > > -----Original Message----- > > From: rtcweb-bounces@ietf.org > [mailto:rtcweb-bounces@ietf.org ] On > > Behalf Of Matthew Kaufman (SKYPE) > > Sent: Thursday=2C April 25=2C 2013 3:28 PM > > To: Bogineni=2C Kalyani=3B 'Cullen Jennings'=3B rtcweb@ietf.org > > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and > RTCWeb > > > > I agree. The ability to set the cipher suite and keys from > JavaScript > > is critical for certain applications. SDES is the best we'll get > with > > SDP as the API. DTLS-SRTP-only would be unacceptably limiting. > > > > Matthew Kaufman > > > > > -----Original Message----- > > > From: rtcweb-bounces@ietf.org > [mailto:rtcweb-bounces@ietf.org ] On > > > Behalf Of Bogineni=2C Kalyani > > > Sent: Thursday=2C April 25=2C 2013 1:21 PM > > > To: 'Cullen Jennings'=3B rtcweb@ietf.org > > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and > RTCWeb > > > > > > We would like to support the use of SDES as a keying method for > > WebRTC. > > > > > > Kalyani Bogineni > > > Verizon > > > > > > -----Original Message----- > > > From: rtcweb-bounces@ietf.org > [mailto:rtcweb-bounces@ietf.org ] On > > > Behalf Of Cullen Jennings > > > Sent: Thursday=2C April 25=2C 2013 11:57 AM > > > To: rtcweb@ietf.org > > > Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > > > > > > The working groups committed some time ago to have a further > > > discussion on whether SDP Security Descriptions (RFC 4568 aka > SDES) > > > would be usable as a keying method for WebRTC. As we prepare for > > that > > > discussion=2C we'd like to have expressions of interest or > support for > > > that approach which indicate the general outlines of support > > proposed. > > > If you wish to make such an expression of support=2C please send > it to > > the chairs or the list. > > > > > > Cullen=2C Magnus=2C & Ted > > > > > > > > > _______________________________________________ > > > rtcweb mailing list > > > rtcweb@ietf.org > > > https://www.ietf.org/mailman/listinfo/rtcweb > > > _______________________________________________ > > > rtcweb mailing list > > > rtcweb@ietf.org > > > https://www.ietf.org/mailman/listinfo/rtcweb > > > > _______________________________________________ > > rtcweb mailing list > > rtcweb@ietf.org > > https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb > > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb --_354ce0b6-6fdb-4ae3-9390-8518a57e959b_ Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8"
I don't understand it either.

Salvatore Loreto <=3Bsalvatore.loreto@ericsson.com>=3B wrote:

I am also puzzled about the request for SDES also in DataChannel.

/Salvatore

On 4/26/13 2:35 PM=2C I=C3=B1aki Baz Castillo wrote:

SDES is obviously requested for legacy interop at RTP layer.= Why do we need SDES in DataChannel if this is a complete new technology?

--
I=C3=B1aki Baz Castillo
<=3Bibc@aliax.net>=3B

El 25/04/2013 23:55=2C "=3BEjzak=2C Richar= d P (Richard)"=3B <=3Brichard.ejzak@alcatel-lucent.com>=3B escribi=C3=B3:
I also agree that we should support SDES in addition to DTLS-SRTP.

This raises a further question about SCTP/DTLS for DataChannels.  =3BIt= seems that if we support SDES-SRTP=2C don't we also need to provide an SDE= S keying mechanism for DataChannels?  =3BEkr: What is needed to realize= this?

Richard Ejzak

>=3B -----Original Message-----
>=3B From: rtcweb-bounces@ietf= .org [mailto:rtcweb-bounces@= ietf.org] On
>=3B Behalf Of Matthew Kaufman (SKYPE)
>=3B Sent: Thursday=2C April 25=2C 2013 3:28 PM
>=3B To: Bogineni=2C Kalyani=3B 'Cullen Jennings'=3B rtcweb@ietf.org
>=3B Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWe= b
>=3B
>=3B I agree. The ability to set the cipher suite and keys from JavaScrip= t
>=3B is critical for certain applications. SDES is the best we'll get wit= h
>=3B SDP as the API. DTLS-SRTP-only would be unacceptably limiting.
>=3B
>=3B Matthew Kaufman
>=3B
>=3B >=3B -----Original Message-----
>=3B >=3B From: rtcweb-bounc= es@ietf.org [mailto:rtcweb-b= ounces@ietf.org] On
>=3B >=3B Behalf Of Bogineni=2C Kalyani
>=3B >=3B Sent: Thursday=2C April 25=2C 2013 1:21 PM
>=3B >=3B To: 'Cullen Jennings'=3B r= tcweb@ietf.org
>=3B >=3B Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) an= d RTCWeb
>=3B >=3B
>=3B >=3B We would like to support the use of SDES as a keying method f= or
>=3B WebRTC.
>=3B >=3B
>=3B >=3B Kalyani Bogineni
>=3B >=3B Verizon
>=3B >=3B
>=3B >=3B -----Original Message-----
>=3B >=3B From: rtcweb-bounc= es@ietf.org [mailto:rtcweb-b= ounces@ietf.org] On
>=3B >=3B Behalf Of Cullen Jennings
>=3B >=3B Sent: Thursday=2C April 25=2C 2013 11:57 AM
>=3B >=3B To: rtcweb@ietf.org >=3B >=3B Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RT= CWeb
>=3B >=3B
>=3B >=3B
>=3B >=3B The working groups committed some time ago to have a further<= br> >=3B >=3B discussion on whether SDP Security Descriptions (RFC 4568 aka= SDES)
>=3B >=3B would be usable as a keying method for WebRTC.  =3BAs we = prepare for
>=3B that
>=3B >=3B discussion=2C we'd like to have expressions of interest or su= pport for
>=3B >=3B that approach which indicate the general outlines of support<= br> >=3B proposed.
>=3B >=3B If you wish to make such an expression of support=2C please s= end it to
>=3B the chairs or the list.
>=3B >=3B
>=3B >=3B Cullen=2C Magnus=2C &=3B Ted <=3BThe Chairs>=3B
>=3B >=3B
>=3B >=3B
>=3B >=3B _______________________________________________
>=3B >=3B rtcweb mailing list
>=3B >=3B rtcweb@ietf.org
>=3B >=3B https://www.ietf.org/mailman/listinfo/rtcweb
>=3B >=3B _______________________________________________
>=3B >=3B rtcweb mailing list
>=3B >=3B rtcweb@ietf.org
>=3B >=3B https://www.ietf.org/mailman/listinfo/rtcweb
>=3B
>=3B _______________________________________________
>=3B rtcweb mailing list
>=3B rtcweb@ietf.org
>=3B https://www.ietf.org/mailman/listinfo/rtcweb
_______________________________________________
rtcweb mailing list
rtcweb@ietf.org
= https://www.ietf.org/mailman/listinfo/rtcweb


_______________________________________________
rtcweb mailing list
rtc=
web@ietf.org
https://www.ietf.org/mailman/listinfo/rtcweb


--_354ce0b6-6fdb-4ae3-9390-8518a57e959b_-- --_330b85ef-59f1-4a1e-8e0f-117305bbe92b_ Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ rtcweb mailing list rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb --_330b85ef-59f1-4a1e-8e0f-117305bbe92b_-- From hammondjohnson@hushmail.com Sat Apr 27 17:27:55 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1531221F995A for ; Sat, 27 Apr 2013 17:27:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wR8TvqqRgRAE for ; Sat, 27 Apr 2013 17:27:54 -0700 (PDT) Received: from smtp5.hushmail.com (smtp5a.hushmail.com [65.39.178.235]) by ietfa.amsl.com (Postfix) with ESMTP id DDD8221F9959 for ; Sat, 27 Apr 2013 17:27:54 -0700 (PDT) Received: from smtp5.hushmail.com (smtp5a.hushmail.com [65.39.178.235]) by smtp5.hushmail.com (Postfix) with SMTP id 49038580C4 for ; Sat, 27 Apr 2013 18:03:56 +0000 (UTC) X-hush-relay-time: 220 X-hush-relay-id: b1bd903faba185ee07e5a0ed3a1fde37 Received: from smtp.hushmail.com (w5.hushmail.com [65.39.178.80]) by smtp5.hushmail.com (Postfix) with ESMTP for ; Sat, 27 Apr 2013 18:03:56 +0000 (UTC) Received: by smtp.hushmail.com (Postfix, from userid 99) id 15A0EE6736; Sat, 27 Apr 2013 18:03:56 +0000 (UTC) MIME-Version: 1.0 Date: Sat, 27 Apr 2013 14:03:55 -0400 To: rtcweb@ietf.org From: hammondjohnson@hushmail.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="UTF-8" Message-Id: <20130427180356.15A0EE6736@smtp.hushmail.com> Subject: [rtcweb] Biggest Fake Conference in Computer Science X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 28 Apr 2013 00:27:55 -0000 We are researchers from different parts of the world and conducted a study on the world’s biggest bogus computer science conference WORLDCOMP ( http://sites.google.com/site/worlddump1 ) organized by Prof. Hamid Arabnia from University of Georgia, USA. We submitted a fake paper to WORLDCOMP 2011 and again (the same paper with a modified title) to WORLDCOMP 2012. This paper had numerous fundamental mistakes. Sample statements from that paper include: (1). Binary logic is fuzzy logic and vice versa (2). Pascal developed fuzzy logic (3). Object oriented languages do not exhibit any polymorphism or inheritance (4). TCP and IP are synonyms and are part of OSI model (5). Distributed systems deal with only one computer (6). Laptop is an example for a super computer (7). Operating system is an example for computer hardware Also, our paper did not express any conceptual meaning. However, it was accepted both the times without any modifications (and without any reviews) and we were invited to submit the final paper and a payment of $500+ fee to present the paper. We decided to use the fee for better purposes than making Prof. Hamid Arabnia (Chairman of WORLDCOMP) rich. After that, we received few reminders from WORLDCOMP to pay the fee but we never responded. We MUST say that you should look at the above website if you have any thoughts to submit a paper to WORLDCOMP. DBLP and other indexing agencies have stopped indexing WORLDCOMP’s proceedings since 2011 due to its fakeness. See http://www.informatik.uni-trier.de/~ley/db/conf/icai/index.html for of one of the conferences of WORLDCOMP and notice that there is no listing after 2010. See Section 2 of http://sites.google.com/site/dumpconf for comments from well-known researchers about WORLDCOMP. The status of your WORLDCOMP papers can be changed from scientific to other (i.e., junk or non-technical) at any time. Better not to have a paper than having it in WORLDCOMP and spoil the resume and peace of mind forever! Our study revealed that WORLDCOMP is a money making business, using University of Georgia mask, for Prof. Hamid Arabnia. He is throwing out a small chunk of that money (around 20 dollars per paper published in WORLDCOMP’s proceedings) to his puppet (Mr. Ashu Solo or A.M.G. Solo) who publicizes WORLDCOMP and also defends it at various forums, using fake/anonymous names. The puppet uses fake names and defames other conferences to divert traffic to WORLDCOMP. He also makes anonymous phone calls and tries to threaten the critiques of WORLDCOMP (See Item 7 of Section 5 of above website). That is, the puppet does all his best to get a maximum number of papers published at WORLDCOMP to get more money into his (and Prof. Hamid Arabnia’s) pockets. Monte Carlo Resort (the venue of WORLDCOMP for more than 10 years, until 2012) has refused to provide the venue for WORLDCOMP’13 because of the fears of their image being tarnished due to WORLDCOMP’s fraudulent activities. That is why WORLDCOMP’13 is taking place at a different resort. WORLDCOMP will not be held after 2013. The draft paper submission deadline is over but still there are no committee members, no reviewers, and there is no conference Chairman. The only contact details available on WORLDCOMP’s website is just an email address! Let us make a direct request to Prof. Hamid arabnia: publish all reviews for all the papers (after blocking identifiable details) since 2000 conference. Reveal the names and affiliations of all the reviewers (for each year) and how many papers each reviewer had reviewed on average. We also request him to look at the Open Challenge (Section 6) at https://sites.google.com/site/moneycomp1 Sorry for posting to multiple lists. Spreading the word is the only way to stop this bogus conference. Please forward this message to other mailing lists and people. We are shocked with Prof. Hamid Arabnia and his puppet’s activities http://worldcomp-fake-bogus.blogspot.com Search Google using the keyword worldcomp fake for additional links. From tim@phonefromhere.com Sun Apr 28 05:07:55 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1A08221F99DF for ; Sun, 28 Apr 2013 05:07:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.298 X-Spam-Level: X-Spam-Status: No, score=-2.298 tagged_above=-999 required=5 tests=[AWL=0.300, BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id u-A+oI9SFrO3 for ; Sun, 28 Apr 2013 05:07:54 -0700 (PDT) Received: from smtp004.apm-internet.net (smtp004.apm-internet.net [85.119.248.54]) by ietfa.amsl.com (Postfix) with ESMTP id 3776321F99C9 for ; Sun, 28 Apr 2013 05:07:53 -0700 (PDT) Received: (qmail 8655 invoked from network); 28 Apr 2013 12:07:52 -0000 X-AV-Scan: clean Received: from unknown (HELO zimbra003.verygoodemail.com) (85.119.248.218) by smtp004.apm-internet.net with SMTP; 28 Apr 2013 12:07:52 -0000 Received: from zimbra003.verygoodemail.com (localhost [127.0.0.1]) by zimbra003.verygoodemail.com (Postfix) with ESMTP id 733EB18A0547; Sun, 28 Apr 2013 13:07:52 +0100 (BST) Received: from [192.67.4.33] (unknown [192.67.4.33]) by zimbra003.verygoodemail.com (Postfix) with ESMTPSA id 553EC18A02B3; Sun, 28 Apr 2013 13:07:52 +0100 (BST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: multipart/alternative; boundary="Apple-Mail=_D3512FAB-B4BF-4FC9-AE0E-162B19680F83" From: Tim Panton In-Reply-To: <7594FB04B1934943A5C02806D1A2204B1C363631@ESESSMB209.ericsson.se> Date: Sun, 28 Apr 2013 13:07:50 +0100 Message-Id: <5A349C85-43C5-4DBE-BBD3-A42D59F8D297@phonefromhere.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> <91B4F744-2201-4361-A8D8-7D36F47B865C@cisco.com> <95219856-8365-4A7E-BD0B-4EECE8868498@phonefromhere.com>, <7594FB04B1934943A5C02806D1A2204B1C363631@ESESSMB209.ericsson.se> To: Christer Holmberg X-Mailer: Apple Mail (2.1283) Cc: "rtcweb_ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 28 Apr 2013 12:07:55 -0000 --Apple-Mail=_D3512FAB-B4BF-4FC9-AE0E-162B19680F83 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 On 27 Apr 2013, at 15:17, Christer Holmberg wrote: >=20 > Hi, > =20 > As I've mentioned before, we should really try to avoid solutions that = require intermediaries to send reINVITEs - or, more general, send SDP = offers. > =20 > Regards, > =20 > Christer If you stick to that rule, you'd want rid of ICE, SRTP, BUNDLE and all = the other things an intermediary may have to add=20 to a plain legacy device's offer in order for it to be acceptable to a = browser.=20 =20 Or in other words: Why is the DTLS re-write especially irksome . ? T. --Apple-Mail=_D3512FAB-B4BF-4FC9-AE0E-162B19680F83 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=iso-8859-1
On 27 Apr 2013, at 15:17, Christer Holmberg wrote:


Hi,
 
As I've mentioned before, we should really try to avoid solutions that require intermediaries to send reINVITEs - or, more general, send SDP offers.
 
Regards,
 
Christer

If you stick to that rule, you'd want rid of ICE, SRTP, BUNDLE and all the other things an intermediary may have to add 
to a plain legacy device's offer in order for it to be acceptable to a browser. 
 
Or in other words: Why is the DTLS re-write especially irksome . ?

T.




--Apple-Mail=_D3512FAB-B4BF-4FC9-AE0E-162B19680F83-- From ibc@aliax.net Sun Apr 28 05:14:44 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4A5C221F988A for ; Sun, 28 Apr 2013 05:14:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.251 X-Spam-Level: X-Spam-Status: No, score=-2.251 tagged_above=-999 required=5 tests=[AWL=-0.175, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_CHICKENPOX_43=0.6, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JUbENiFWZPZ9 for ; Sun, 28 Apr 2013 05:14:43 -0700 (PDT) Received: from mail-qe0-f43.google.com (mail-qe0-f43.google.com [209.85.128.43]) by ietfa.amsl.com (Postfix) with ESMTP id 83F1A21F97C4 for ; Sun, 28 Apr 2013 05:14:41 -0700 (PDT) Received: by mail-qe0-f43.google.com with SMTP id f6so3585882qej.30 for ; Sun, 28 Apr 2013 05:14:41 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type:x-gm-message-state; bh=TfgdeAkLmDZn0BDprVtzPMDScu3B7U/4VB4x/epjmGE=; b=Pau1tmNZKFgGmWZ/Pxzxirt0SBBbgnbQpMzpH2f65lFsvfEfyszkKeTt+NS1/oFYSU X5Gbqf/4jv7r1vJVN+q1qu1nGuRUOH9FaHIVldInh7PiU6hnAOxS3aIY9sBlHB8CnDJb vTuCfr+pyhKROBgQPbB1obymWXiuvBJ0pzmHv9CdnHMrVlsBB+u4Oz2lVzTqx6XiNz+i 4XXH6P5uq/qHpAzzE+QrtIrTXQMRM4b4xVEodsbPTJcvSawVapu6Ta6orhf1f2NOmPcc BQoMWtbttUrYLWvfqNxXkeSiMwnBchthi5nwX6ujU990WMXEAQpFFXd15f4akk1oRrNa j5Fw== MIME-Version: 1.0 X-Received: by 10.224.184.204 with SMTP id cl12mr47948465qab.0.1367151280902; Sun, 28 Apr 2013 05:14:40 -0700 (PDT) Received: by 10.49.81.175 with HTTP; Sun, 28 Apr 2013 05:14:40 -0700 (PDT) Received: by 10.49.81.175 with HTTP; Sun, 28 Apr 2013 05:14:40 -0700 (PDT) In-Reply-To: <5A349C85-43C5-4DBE-BBD3-A42D59F8D297@phonefromhere.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> <91B4F744-2201-4361-A8D8-7D36F47B865C@cisco.com> <95219856-8365-4A7E-BD0B-4EECE8868498@phonefromhere.com> <7594FB04B1934943A5C02806D1A2204B1C363631@ESESSMB209.ericsson.se> <5A349C85-43C5-4DBE-BBD3-A42D59F8D297@phonefromhere.com> Date: Sun, 28 Apr 2013 14:14:40 +0200 Message-ID: From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= To: Tim Panton Content-Type: multipart/alternative; boundary=20cf302ef9d874008e04db6ab650 X-Gm-Message-State: ALoCoQmXcosrD8H3LsIqeQZPHGn/9qu69zYkOYMa5MaZv7ltAart4OYZe2Uq53XyP8Jy4RRDfK8J Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 28 Apr 2013 12:14:44 -0000 --20cf302ef9d874008e04db6ab650 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable The problem is not DTLS (which can be handled by a pure media gateway) but DTLS+EKT which means that the server should generate a reINVITE for legacy interop (so the gateway would become a complex media+signaling B2BUA). -- I=C3=B1aki Baz Castillo El 28/04/2013 14:07, "Tim Panton" escribi=C3=B3: > > On 27 Apr 2013, at 15:17, Christer Holmberg wrote: > > > Hi, > > As I've mentioned before, we should really try to avoid solutions that > require intermediaries to send reINVITEs - or, more general, send SDP > offers. > > Regards, > > Christer > > > If you stick to that rule, you'd want rid of ICE, SRTP, BUNDLE and all th= e > other things an intermediary may have to add > to a plain legacy device's offer in order for it to be acceptable to a > browser. > > Or in other words: Why is the DTLS re-write especially irksome . ? > > T. > > > > > --20cf302ef9d874008e04db6ab650 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

The problem is not DTLS (which can be handled by a pure medi= a gateway) but DTLS+EKT which means that the server should generate a reINV= ITE for legacy interop (so the gateway would become a complex media+signali= ng B2BUA).

--
I=C3=B1aki Baz Castillo
<ibc@aliax.net>

El 28/04/2013 14:07, "Tim Panton" <= tim@phonefromhere.com> escr= ibi=C3=B3:

On 27 Apr 2013, at 15:17,= Christer Holmberg wrote:


Hi,
=C2=A0
As I've mentioned before, we should really try to avoid solutions = that require intermediaries to send reINVITEs - or, more general, send SDP = offers.
=C2=A0
Regards,
=C2=A0
Christer

If you stick to that rule, you'= ;d want rid of ICE, SRTP, BUNDLE and all the other things an intermediary m= ay have to add=C2=A0
to a plain legacy device's offer in orde= r for=C2=A0it to be acceptable to a browser.=C2=A0
=C2=A0
Or in other words: Why is the DTLS re-write especiall= y irksome . ?

T.




--20cf302ef9d874008e04db6ab650-- From Markus.Isomaki@nokia.com Sun Apr 28 12:39:07 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BA41D21F97C5 for ; Sun, 28 Apr 2013 12:39:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Vg50ewcivymC for ; Sun, 28 Apr 2013 12:39:07 -0700 (PDT) Received: from mgw-sa01.nokia.com (smtp.nokia.com [147.243.1.47]) by ietfa.amsl.com (Postfix) with ESMTP id E8DC021F9763 for ; Sun, 28 Apr 2013 12:39:06 -0700 (PDT) Received: from vaebh104.NOE.Nokia.com (vaebh104.europe.nokia.com [10.160.244.30]) by mgw-sa01.nokia.com (Sentrion-MTA-4.2.2/Sentrion-MTA-4.2.2) with ESMTP id r3SJd1Hf029027; Sun, 28 Apr 2013 22:39:02 +0300 Received: from smtp.mgd.nokia.com ([65.54.30.61]) by vaebh104.NOE.Nokia.com over TLS secured channel with Microsoft SMTPSVC(6.0.3790.3959); Sun, 28 Apr 2013 22:39:01 +0300 Received: from 008-AM1MPN1-042.mgdnok.nokia.com ([169.254.2.144]) by 008-AM1MMR1-006.mgdnok.nokia.com ([65.54.30.61]) with mapi id 14.02.0328.011; Sun, 28 Apr 2013 19:39:01 +0000 From: To: , Thread-Topic: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb Thread-Index: AQHOQc2aZhag0IkaJUuPrNdkYnKmoJjsC0EQ Date: Sun, 28 Apr 2013 19:39:00 +0000 Message-ID: References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> In-Reply-To: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-tituslabs-classifications-30: TLPropertyRoot=Nokia;Confidentiality=Nokia Internal Use Only;Project=None; x-titus-version: 3.5.9.3 x-headerinfofordlp: None x-tituslabs-classificationhash-30: VgNFIFU9Hx+/nZJb9Kg7Ik3QeNEccZVB3Vc5WJiRQg5/fip2jlWgACI+jRRjlOwkIu/5buv39veohDwU6hwGZw9EBm4YHEofpTn7XF45mSMfkOeYrxBwvTl+gSohzIRKIZD0NNsKGoEaB/e09ZsMFB/jxGH0e+k4nqZ8ekJ+OAShcpPjImUB2UzpKLUeKFecgIEVUew0+eeJhTamkthp50N9QIoW/1N940fyU+c5wzIHPhWO8s8uieP0+1vjT24p/FblDSYtIA2GugMLd6ZfJg== x-originating-ip: [10.163.26.232] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginalArrivalTime: 28 Apr 2013 19:39:01.0892 (UTC) FILETIME=[08F4D440:01CE4448] X-Nokia-AV: Clean Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 28 Apr 2013 19:39:07 -0000 Hi, I prefer having SDES as a possible keying method for WebRTC, mainly for eas= ier interop with non-WebRTC systems. I see a lot of people working on that = type of use cases, i.e. a "browser client access" to an existing communicat= ion service.=20 Markus=20 -----Original Message----- From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of= ext Cullen Jennings Sent: 25 April, 2013 18:57 To: rtcweb@ietf.org Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb The working groups committed some time ago to have a further discussion on = whether SDP Security Descriptions (RFC 4568 aka SDES) would be usable as a = keying method for WebRTC. As we prepare for that discussion, we'd like to = have expressions of interest or support for that approach which indicate th= e general outlines of support proposed. If you wish to make such an expres= sion of support, please send it to the chairs or the list. Cullen, Magnus, & Ted _______________________________________________ rtcweb mailing list rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb From binod.pg@oracle.com Sun Apr 28 22:20:51 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1CC1121F9D04 for ; Sun, 28 Apr 2013 22:20:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.804 X-Spam-Level: X-Spam-Status: No, score=-0.804 tagged_above=-999 required=5 tests=[RCVD_ILLEGAL_IP=3.196, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 74bPQF+kZZTA for ; Sun, 28 Apr 2013 22:20:50 -0700 (PDT) Received: from userp1040.oracle.com (userp1040.oracle.com [156.151.31.81]) by ietfa.amsl.com (Postfix) with ESMTP id C442A21F9D03 for ; Sun, 28 Apr 2013 22:20:46 -0700 (PDT) Received: from acsinet22.oracle.com (acsinet22.oracle.com [141.146.126.238]) by userp1040.oracle.com (Sentrion-MTA-4.3.1/Sentrion-MTA-4.3.1) with ESMTP id r3T5KcEJ013511 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Mon, 29 Apr 2013 05:20:39 GMT Received: from aserz7021.oracle.com (aserz7021.oracle.com [141.146.126.230]) by acsinet22.oracle.com (8.14.4+Sun/8.14.4) with ESMTP id r3T5KcQe023936 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL) for ; Mon, 29 Apr 2013 05:20:39 GMT Received: from abhmt104.oracle.com (abhmt104.oracle.com [141.146.116.56]) by aserz7021.oracle.com (8.14.4+Sun/8.14.4) with ESMTP id r3T5KcJS019745 for ; Mon, 29 Apr 2013 05:20:38 GMT Received: from [223.239.139.173] (/223.239.139.173) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Sun, 28 Apr 2013 22:20:38 -0700 Message-ID: <517E0322.2060303@oracle.com> Date: Mon, 29 Apr 2013 10:50:34 +0530 From: Binod User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> In-Reply-To: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Source-IP: acsinet22.oracle.com [141.146.126.238] Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 05:20:51 -0000 I have been reading the discussion on this topic and I prefer supporting SDES as a keying method for WebRTC. Not having SDES will have non trivial impact on interop. With EKT, there is a signalling complexity of sending re-INVITEs, which make the gateway complex. Without EKT, you need per-packet crypto for media exchange, which is CPU intensive. The fingerprint verification and all other additional DTLS-SRTP advantages can still be leveraged when both side support DTLS-SRTP. And then if a gateway really do not want to use SDES, it can support DTLS/SDES gateway anyway. thanks, Binod. On Thursday 25 April 2013 09:27 PM, Cullen Jennings wrote: > The working groups committed some time ago to have a further discussion on whether SDP Security Descriptions (RFC 4568 aka SDES) would be usable as a keying method for WebRTC. As we prepare for that discussion, we'd like to have expressions of interest or support for that approach which indicate the general outlines of support proposed. If you wish to make such an expression of support, please send it to the chairs or the list. > > Cullen, Magnus, & Ted > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From harald@alvestrand.no Mon Apr 29 01:29:35 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 904C521F9903 for ; Mon, 29 Apr 2013 01:29:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.598 X-Spam-Level: X-Spam-Status: No, score=-110.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SCJaZkQtk8XL for ; Mon, 29 Apr 2013 01:29:34 -0700 (PDT) Received: from eikenes.alvestrand.no (eikenes.alvestrand.no [158.38.152.233]) by ietfa.amsl.com (Postfix) with ESMTP id 49A4521F960E for ; Mon, 29 Apr 2013 01:29:34 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by eikenes.alvestrand.no (Postfix) with ESMTP id AF67739E0A7 for ; Mon, 29 Apr 2013 10:29:31 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at eikenes.alvestrand.no Received: from eikenes.alvestrand.no ([127.0.0.1]) by localhost (eikenes.alvestrand.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Jl1LoPBnvpI1 for ; Mon, 29 Apr 2013 10:29:30 +0200 (CEST) Received: from [IPv6:2001:470:de0a:27:684f:7f87:7e96:8399] (unknown [IPv6:2001:470:de0a:27:684f:7f87:7e96:8399]) by eikenes.alvestrand.no (Postfix) with ESMTPSA id C521339E091 for ; Mon, 29 Apr 2013 10:29:30 +0200 (CEST) Message-ID: <517E2F6A.30905@alvestrand.no> Date: Mon, 29 Apr 2013 10:29:30 +0200 From: Harald Alvestrand User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> <9F33F40F6F2CD847824537F3C4E37DDF0E6C04AF@MCHP04MSX.global-ad.net> <4AA3A95D6033ED488F8AE4E45F47448742B13620@WABOTH9MSGUSR8B.ITServices.sbc.com> <829F9A35-5F23-4A0F-9831-80478F70965E@phonefromhere.com> In-Reply-To: <829F9A35-5F23-4A0F-9831-80478F70965E@phonefromhere.com> Content-Type: multipart/alternative; boundary="------------060001020908070803000309" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 08:29:35 -0000 This is a multi-part message in MIME format. --------------060001020908070803000309 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Would it be possible to get real data on 1) and 2) here, so that we can stop talking about "slow" and instead talk about "N milliseconds"? On 04/26/2013 08:42 PM, Tim Panton wrote: > > On 26 Apr 2013, at 18:59, Roman Shpount wrote: >> >> The arguments why SDES is required in some cases instead of DTLS are: >> >> 1. Additional call setup delay caused by DTLS > > This is a serious problem - made worse by the O/A semantics - I think > we will find that in real usage > sites will pre-warm a DTLS connection so it is ready to go when the > user clicks connect. Can someone create a call setup test that tells us how long it takes to set up DTLS? I'd like to see this statement translated into milliseconds - just having the number of milliseconds with current code on a loopback interface should give us a lower bound of the issue; we can then make things more complex by inserting a non-zero RTT into the mix (should be easy if we can coerce our setup to be TURN-server-only). > >> >> 2. High computational load on each call setup. This can be >> significant with high number of short calls being setup. This would >> be especially significant for any sort of server interfacing WebRTC >> or WebRTC to SIP gateway. > > I would dispute this - remember exactly the same users have almost > certainly logged into an https:// portal - indeed only a small > percentage of them will start a DTLS session for during any given web > session. The web seems to still be working. Can someone translate this statement in to CPU-milliseconds per call setup? --------------060001020908070803000309 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
Would it be possible to get real data on 1) and 2) here, so that we can stop talking about "slow" and instead talk about "N milliseconds"?


On 04/26/2013 08:42 PM, Tim Panton wrote:

On 26 Apr 2013, at 18:59, Roman Shpount wrote:
The arguments why SDES is required in some cases instead of DTLS are:

1. Additional call setup delay caused by DTLS

This is a serious problem - made worse by the O/A semantics - I think we will find that in real usage
sites will pre-warm a DTLS connection so it is ready to go when the user clicks connect.

Can someone create a call setup test that tells us how long it takes to set up DTLS?
I'd like to see this statement translated into milliseconds - just having the number of milliseconds with current code on a loopback interface should give us a lower bound of the issue; we can then make things more complex by inserting a non-zero RTT into the mix (should be easy if we can coerce our setup to be TURN-server-only).



2. High computational load on each call setup. This can be significant with high number of short calls being setup. This would be especially significant for any sort of server interfacing WebRTC or WebRTC to SIP gateway.

I would dispute this - remember exactly the same users have almost certainly logged into an https:// portal - indeed only a small 
percentage of them will start a DTLS session for during any given web session. The web seems to still be working.

Can someone translate this statement in to CPU-milliseconds per call setup?

--------------060001020908070803000309-- From tim@phonefromhere.com Mon Apr 29 03:30:07 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E172B21F9CFF for ; Mon, 29 Apr 2013 03:30:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XtEjMYD13Zda for ; Mon, 29 Apr 2013 03:30:07 -0700 (PDT) Received: from smtp003.apm-internet.net (smtp003.apm-internet.net [85.119.248.52]) by ietfa.amsl.com (Postfix) with ESMTP id 1347B21F9A3C for ; Mon, 29 Apr 2013 03:30:06 -0700 (PDT) Received: (qmail 81767 invoked from network); 29 Apr 2013 10:30:05 -0000 X-AV-Scan: clean Received: from unknown (HELO zimbra003.verygoodemail.com) (85.119.248.218) by smtp003.apm-internet.net with SMTP; 29 Apr 2013 10:30:05 -0000 Received: from zimbra003.verygoodemail.com (localhost [127.0.0.1]) by zimbra003.verygoodemail.com (Postfix) with ESMTP id BB43718A0520; Mon, 29 Apr 2013 11:30:03 +0100 (BST) Received: from [192.67.4.33] (unknown [192.67.4.33]) by zimbra003.verygoodemail.com (Postfix) with ESMTPSA id 9FE9118A03A2; Mon, 29 Apr 2013 11:30:03 +0100 (BST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=us-ascii From: Tim Panton In-Reply-To: <517E0322.2060303@oracle.com> Date: Mon, 29 Apr 2013 11:30:02 +0100 Content-Transfer-Encoding: quoted-printable Message-Id: <53B9C161-C492-4F07-A9BD-75E17AE79AC9@phonefromhere.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <517E0322.2060303@oracle.com> To: Binod X-Mailer: Apple Mail (2.1283) Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 10:30:08 -0000 On 29 Apr 2013, at 06:20, Binod wrote: > I have been reading the discussion on this topic and I prefer > supporting SDES as a keying method for WebRTC. >=20 > Not having SDES will have non trivial impact on interop. With > EKT, there is a signalling complexity of sending re-INVITEs, which > make the gateway complex. Without EKT, you need per-packet > crypto for media exchange, which is CPU intensive. I've seen this asserted more than once, but I'd love to see a _current_ = example where=20 you really have an existing network of SRTP/ICE/BUNDLE/RTCP-MUX capable legacy endpoints that you want to connect to webRTC without a = media-level SBC or=20 call recording.=20 My fear is that people are just basing anti-DTLS opinions on the = perceived difficulty of=20 building such a network in the future.=20 I'm ok with legacy interop as a secondary goal of this WG , but = putative-future-legacy interop is going too far IMHO, especially since it further complicates the = already tricky problem of defining interoperable SDP. If it is a choice between adding complexity in a legacy gateway or every = browser I'd rather add it in the gateway. T. From emil@sip-communicator.org Mon Apr 29 04:38:24 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BCBAC21F997A for ; Mon, 29 Apr 2013 04:38:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id z6KoG2t0lUKp for ; Mon, 29 Apr 2013 04:38:23 -0700 (PDT) Received: from mail-we0-x230.google.com (mail-we0-x230.google.com [IPv6:2a00:1450:400c:c03::230]) by ietfa.amsl.com (Postfix) with ESMTP id 4E24E21F9814 for ; Mon, 29 Apr 2013 04:38:21 -0700 (PDT) Received: by mail-we0-f176.google.com with SMTP id s10so5107907wey.7 for ; Mon, 29 Apr 2013 04:38:12 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:message-id:date:from:organization:user-agent :mime-version:to:cc:subject:references:in-reply-to:content-type :content-transfer-encoding:x-gm-message-state; bh=YqDvzfvCPmcbrM/JeOvOBhblL98SCVjeqSP+V3LUCPo=; b=WMpRYC3XUquC4rsZxE7KG1SWW12XRsfHYxh2tbdjNigchPb42EpnCLhMzjDxOS8M2j YuI782Ezkn/HuifuzeAny3OvWB2ykIWHGsb8Qx/7QP+aeZTq5i2RkHAS7TfLduSo2C1M xdxkEq5mmoeLPe1p7RlP5AQNhiWPG1CgNHFhnS0zTj4K193mm9NxwUpDXR7aoftbFyFe sdHsJmkhp62/Ka2EovFo6o4e5F44Q8Vo8HubUJ7x4mnirJZ2/mKpq51PYPWQmRvXoJPC TWsPaWkKUjJePfDixeF9Rt7tgwZ1Gq9eym8PKWt1lLDbzkJ5hakwO4dgJl67teRotsUe VTEw== X-Received: by 10.180.187.206 with SMTP id fu14mr16993363wic.11.1367235487414; Mon, 29 Apr 2013 04:38:07 -0700 (PDT) Received: from pastropnet.u-strasbg.fr (pastropnet.u-strasbg.fr. [130.79.90.87]) by mx.google.com with ESMTPSA id o3sm21710409wia.2.2013.04.29.04.38.05 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 29 Apr 2013 04:38:06 -0700 (PDT) Message-ID: <517E5B9D.50001@jitsi.org> Date: Mon, 29 Apr 2013 13:38:05 +0200 From: Emil Ivov Organization: Jitsi User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: Tim Panton References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <517E0322.2060303@oracle.com> <53B9C161-C492-4F07-A9BD-75E17AE79AC9@phonefromhere.com> In-Reply-To: <53B9C161-C492-4F07-A9BD-75E17AE79AC9@phonefromhere.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Gm-Message-State: ALoCoQm0Gw+lgBwu8C9bUT7Pp3SSoX3Ky0qxw3IjJL51EtA6mCj3sL3h4dIXvzOc06cNBgutyQVG Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 11:38:24 -0000 On 29.04.13, 12:30, Tim Panton wrote: > > On 29 Apr 2013, at 06:20, Binod wrote: > >> I have been reading the discussion on this topic and I prefer >> supporting SDES as a keying method for WebRTC. >> >> Not having SDES will have non trivial impact on interop. With >> EKT, there is a signalling complexity of sending re-INVITEs, which >> make the gateway complex. Without EKT, you need per-packet >> crypto for media exchange, which is CPU intensive. > > I've seen this asserted more than once, but I'd love to see a _current_ example where > you really have an existing network of SRTP/ICE/BUNDLE/RTCP-MUX capable > legacy endpoints Well, in all fairness it would only have to be SRTP/ICE, bundle and rtcp-mux being optional, wouldn't it? The above is already a more common combination. Besides, ICE is easily handled by a light-weight gateway that would only add a relayed candidate and that doesn't need to understand any sort of encryption. Emil -- https://jitsi.org From ibc@aliax.net Mon Apr 29 04:49:27 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5108221F9D7E for ; Mon, 29 Apr 2013 04:49:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.078 X-Spam-Level: X-Spam-Status: No, score=-1.078 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, J_CHICKENPOX_43=0.6, MIME_8BIT_HEADER=0.3, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6yT9GpYT9n4y for ; Mon, 29 Apr 2013 04:49:27 -0700 (PDT) Received: from mail-qa0-x22a.google.com (mail-qa0-x22a.google.com [IPv6:2607:f8b0:400d:c00::22a]) by ietfa.amsl.com (Postfix) with ESMTP id CB5D021F9D7D for ; Mon, 29 Apr 2013 04:49:26 -0700 (PDT) Received: by mail-qa0-f42.google.com with SMTP id dx4so971833qab.8 for ; Mon, 29 Apr 2013 04:49:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:content-transfer-encoding :x-gm-message-state; bh=7APR6d5Cfk7/kkuM4D4FfQER79YdQLZXUeLyLhExLAs=; b=Z5+LBXAQbH3DUvae3KlF+zgWQMFQW+y6OxvXKJta6pj7THY73t8/Sa3XGp0742A9Sl E6kyHR5vD/m1pQ68Ohlat8XuExspK0SPFRHTYgk/kLaFZCzNvbcwQ/PM/KQFA4HfBWSJ I9esANLg+PuayKJd6uDD9TqkUzzZWQnKWqfZjv2SWhHbSEQYfR5R0EVIxYiBfrJQS6La 4I3wl69F+z/tvosMnrcROz7hsd6B/ukl4RHtS9ZrdrbqPazG4wfQFH4xrYHeM9pndwOI VS9nRMfm3k72Ml0+VTMMPlQRJRCbvSSw0Qnev2XJLefNnzAI7GUWsnNEIwmuHRLaKe0R UsJg== X-Received: by 10.224.53.11 with SMTP id k11mr51524868qag.3.1367236166183; Mon, 29 Apr 2013 04:49:26 -0700 (PDT) MIME-Version: 1.0 Received: by 10.49.81.175 with HTTP; Mon, 29 Apr 2013 04:49:06 -0700 (PDT) In-Reply-To: <53B9C161-C492-4F07-A9BD-75E17AE79AC9@phonefromhere.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <517E0322.2060303@oracle.com> <53B9C161-C492-4F07-A9BD-75E17AE79AC9@phonefromhere.com> From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= Date: Mon, 29 Apr 2013 13:49:06 +0200 Message-ID: To: Tim Panton Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Gm-Message-State: ALoCoQn3mtwPnLksG9mNe+tl4vNd1W5dkLD8KC2+40JaDZdeYK34LwAe5Rr1oQ2J4Kz9PHweNSaO Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 11:49:27 -0000 2013/4/29 Tim Panton : > I've seen this asserted more than once, but I'd love to see a _current_ e= xample where > you really have an existing network of SRTP/ICE/BUNDLE/RTCP-MUX capable > legacy endpoints that you want to connect to webRTC without a media-level= SBC or > call recording. > > My fear is that people are just basing anti-DTLS opinions on the perceive= d difficulty of > building such a network in the future. > > I'm ok with legacy interop as a secondary goal of this WG , but putative-= future-legacy interop > is going too far IMHO, especially since it further complicates the alread= y tricky problem of > defining interoperable SDP. > > If it is a choice between adding complexity in a legacy gateway or every = browser > I'd rather add it in the gateway. Hi Tim, let's please separate DTLS and DTLS+EKT: - DTLS-SRTP: I agree with you. It seems that people consider it a barrier for legacy interop (while it seems not so hard as implementing ICE, bundle, rtcp-mix....). Anyhow a media gateway would do the job, exactly as when using SDES-SRTP. - DTLS-EKT-SRTP: This requires a gateway sending like "re-INVITE" for common operations as multimedia session transfer, which involves the gateway becoming both a media gateway and a complex signaling B2BUA (and we hate that, right?). So please let's separate DTLS and DTLS+EKT since they are really different options. Best regards. -- I=C3=B1aki Baz Castillo From christer.holmberg@ericsson.com Mon Apr 29 05:17:28 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A61FC21F9D84 for ; Mon, 29 Apr 2013 05:17:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.249 X-Spam-Level: X-Spam-Status: No, score=-6.249 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cwpdVLe4SpPz for ; Mon, 29 Apr 2013 05:17:28 -0700 (PDT) Received: from mailgw2.ericsson.se (mailgw2.ericsson.se [193.180.251.37]) by ietfa.amsl.com (Postfix) with ESMTP id A42CA21F9D85 for ; Mon, 29 Apr 2013 05:17:27 -0700 (PDT) X-AuditID: c1b4fb25-b7f366d000004d10-73-517e64d6cecb Received: from ESESSHC016.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw2.ericsson.se (Symantec Mail Security) with SMTP id 68.AB.19728.6D46E715; Mon, 29 Apr 2013 14:17:26 +0200 (CEST) Received: from ESESSMB209.ericsson.se ([169.254.9.167]) by ESESSHC016.ericsson.se ([153.88.183.66]) with mapi id 14.02.0328.009; Mon, 29 Apr 2013 14:17:26 +0200 From: Christer Holmberg To: Tim Panton Thread-Topic: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb Thread-Index: AQHOQc2dBvHgQupeBUKbTywOt/T6cpjnAcgAgABdtoCAAOBNgIAAG7QAgAAAtICAAcQHzoABTKUAgAG2G88= Date: Mon, 29 Apr 2013 12:17:25 +0000 Message-ID: <7594FB04B1934943A5C02806D1A2204B1C367EC9@ESESSMB209.ericsson.se> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <74300615-2293-4DCE-82A7-475F1A5A8256@gmail.com> <91B4F744-2201-4361-A8D8-7D36F47B865C@cisco.com> <95219856-8365-4A7E-BD0B-4EECE8868498@phonefromhere.com>, <7594FB04B1934943A5C02806D1A2204B1C363631@ESESSMB209.ericsson.se>, <5A349C85-43C5-4DBE-BBD3-A42D59F8D297@phonefromhere.com> In-Reply-To: <5A349C85-43C5-4DBE-BBD3-A42D59F8D297@phonefromhere.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [153.88.183.17] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrCLMWRmVeSWpSXmKPExsUyM+Jvre61lLpAg2XX9C2m77OxWPuvnd3i 4vZbjA7MHuca3rN7LFnyk8ljyaRGtgDmKC6blNSczLLUIn27BK6MH/uvshWcZ694dvctawPj P9YuRk4OCQETiXsPdzNB2GISF+6tZ+ti5OIQEjjMKLFozWxWCGcJo8Sln4+Yuxg5ONgELCS6 /2mDNIgIqEmc+3GYGcRmFkiUuH37DBuILSzgKtH79Sc7RI2bRPOmFmYIO0ni3OrHjCBjWARU JW5sdgAJ8wr4SvQ97WWCWPWYWWLbgzlgB3ECzTnzewHYTEag476fWsMEsUtc4taT+VBHC0gs 2XOeGcIWlXj5GOQxDiBbUWJ5vxxEuZ7EjalT2CBsbYllC18zQ+wVlDg58wnLBEaxWUimzkLS MgtJyywkLQsYWVYxsucmZuaklxttYgTGzMEtv1V3MN45J3KIUZqDRUmcd4ZUZaCQQHpiSWp2 ampBalF8UWlOavEhRiYOTqkGRnWBGzE3FMp7vEyMnV5eaWqX2L10aZiN+ve375MXPlsSfb68 vVnntfi20zY6H9yS/RqnrP7AYbpbvP5oG1eOcMnKquf+Jdya+66E2zO/XaXXYcT2w6xwjsxc Fxb2Daumml6PapvDt9VeQ4tfpWLbp/Tg0FP39Z7UbJl2o/e1vNxbDUPRXQ+ClViKMxINtZiL ihMB23WNJmcCAAA= Cc: "rtcweb_ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 12:17:28 -0000 Hi, An intermediary doesn't have to do BUNDLE, and the intremediary can act as = ICE lite, and things will still work fine with the rtcweb client. Regards, Christer ________________________________________ From: Tim Panton [tim@phonefromhere.com] Sent: Sunday, 28 April 2013 3:07 PM To: Christer Holmberg Cc: I=C3=B1aki Baz Castillo; rtcweb_ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb On 27 Apr 2013, at 15:17, Christer Holmberg wrote: Hi, As I've mentioned before, we should really try to avoid solutions that requ= ire intermediaries to send reINVITEs - or, more general, send SDP offers. Regards, Christer If you stick to that rule, you'd want rid of ICE, SRTP, BUNDLE and all the = other things an intermediary may have to add to a plain legacy device's offer in order for it to be acceptable to a brow= ser. Or in other words: Why is the DTLS re-write especially irksome . ? T. From richard.ejzak@alcatel-lucent.com Mon Apr 29 06:40:17 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5226A21F9DA3 for ; Mon, 29 Apr 2013 06:40:17 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.598 X-Spam-Level: X-Spam-Status: No, score=-10.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LF7qd9bbQMOV for ; Mon, 29 Apr 2013 06:40:16 -0700 (PDT) Received: from ihemail3.lucent.com (ihemail3.lucent.com [135.245.0.37]) by ietfa.amsl.com (Postfix) with ESMTP id 083A521F9DA1 for ; Mon, 29 Apr 2013 06:40:15 -0700 (PDT) Received: from us70tusmtp1.zam.alcatel-lucent.com (h135-5-2-63.lucent.com [135.5.2.63]) by ihemail3.lucent.com (8.13.8/IER-o) with ESMTP id r3TDeCSC010787 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Mon, 29 Apr 2013 08:40:12 -0500 (CDT) Received: from US70TWXCHHUB04.zam.alcatel-lucent.com (us70twxchhub04.zam.alcatel-lucent.com [135.5.2.36]) by us70tusmtp1.zam.alcatel-lucent.com (GMO) with ESMTP id r3TDe09S016998 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Mon, 29 Apr 2013 09:40:12 -0400 Received: from US70UWXCHMBA05.zam.alcatel-lucent.com ([169.254.10.44]) by US70TWXCHHUB04.zam.alcatel-lucent.com ([135.5.2.36]) with mapi id 14.02.0247.003; Mon, 29 Apr 2013 09:40:05 -0400 From: "Ejzak, Richard P (Richard)" To: Bernard Aboba , Salvatore Loreto Thread-Topic: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb Thread-Index: AQHOQ19D/Cgh8/1Iw0eB7cqfjULVv5jtM2PA Date: Mon, 29 Apr 2013 13:40:05 +0000 Message-ID: <03FBA798AC24E3498B74F47FD082A92F3BB9C0F6@US70UWXCHMBA05.zam.alcatel-lucent.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US 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29 07:00:24 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BE96D21F9A26 for ; Mon, 29 Apr 2013 07:00:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.949 X-Spam-Level: X-Spam-Status: No, score=-5.949 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_SE=0.35, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KYy8+fwW-KAe for ; Mon, 29 Apr 2013 07:00:23 -0700 (PDT) Received: from mailgw7.ericsson.se (mailgw7.ericsson.se [193.180.251.48]) by ietfa.amsl.com (Postfix) with ESMTP id 112E321F9A01 for ; Mon, 29 Apr 2013 07:00:21 -0700 (PDT) X-AuditID: c1b4fb30-b7f266d000000cb5-c8-517e7cf4162f Received: from esessmw0247.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw7.ericsson.se (Symantec Mail Security) with SMTP id 16.60.03253.4FC7E715; Mon, 29 Apr 2013 16:00:20 +0200 (CEST) Received: from [150.132.141.119] (153.88.115.8) by esessmw0247.eemea.ericsson.se (153.88.115.94) with Microsoft SMTP Server id 8.3.279.1; Mon, 29 Apr 2013 16:00:20 +0200 Message-ID: <517E7CF4.6010907@ericsson.com> Date: Mon, 29 Apr 2013 16:00:20 +0200 From: =?windows-1252?Q?Stefan_H=E5kansson_LK?= User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: "rtcweb@ietf.org" Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrMJMWRmVeSWpSXmKPExsUyM+Jvre6XmrpAg0fLdCzW/mtnd2D0WLLk J1MAYxSXTUpqTmZZapG+XQJXxt3nggXfuStadl9na2Ds5+pi5OSQEDCR2PF6HwuELSZx4d56 ti5GLg4hgVOMEq+utzGCJIQE1gI53dYgNq+AtsSCN2/AGlgEVCW2L7/M3sXIwcEmECwxY4oR SFhUIEri39vdjBDlghInZz4BKxcRUJe4/PACO8h8YYFljBJX585kBOllFrCXeLC1DKSGWUBe onnrbGaItboS717fY53AyDcLyahZCB2zkHQsYGRexciem5iZk15uvokRGDAHt/w22MG46b7Y IUZpDhYlcd4ZUpWBQgLpiSWp2ampBalF8UWlOanFhxiZODilGhhtRAvSmFed9zjiP+Vzt4jX aw8BaedL+oeuHYpwaM5rCPxw/LHjhYbLu2cKPlBceKlMvSElopJ5MeOfNS3H+jiXvV40+8Yp +Zwiz8S5rJtSFl0y5nzkx/Hc7G6aYH5057+PCV/+FFsvj/Yq/Cln6DCzd45RsC5LCPfH3+mV qiq/TDdedn1d26/EUpyRaKjFXFScCACeNRPt5gEAAA== Subject: [rtcweb] =?windows-1252?q?WG_last_call_comments_on_use-case_and_r?= =?windows-1252?q?equirement_document=2C_=932119_Language_Requirements=94?= X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 14:00:24 -0000 First off: thanks to everyone that responded to the last call ([1]), there is a lot of valuable and helpful feedback provided in those responses!. This mail is the first in a series trying to process and conclude the responses and the discussion that followed as a result of the WG last call of the use-cases and requirements document. The topic in this mail is what Bernard brought up in [2] in the context of what the document is going to be used for, namely if referencing RFC2119 is appropriate. I interpret the discussion ([2] - [8] - and please correct me if I missed any related mail) to lead to the conclusion that we should not reference RFC2119. My plan moving forward is to remove the reference to RFC 2119, and in addition to replace the uppercase MUST’s in the requirements with lowercase must’s. As for the discussion of what the document will be used for, I will return to that in another mail. Stefan [1] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06136.html [2] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06181.html [3] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06186.html [4] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06191.html [5] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06197.html [6] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06218.html [7] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06225.html [8] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06292.html From stefan.lk.hakansson@ericsson.com Mon Apr 29 07:01:12 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DFEC521F9D1F for ; Mon, 29 Apr 2013 07:01:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.949 X-Spam-Level: X-Spam-Status: No, score=-5.949 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_SE=0.35, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NlmsAgyV8Zqh for ; Mon, 29 Apr 2013 07:01:11 -0700 (PDT) Received: from mailgw2.ericsson.se (mailgw2.ericsson.se [193.180.251.37]) by ietfa.amsl.com (Postfix) with ESMTP id 631C021F8433 for ; Mon, 29 Apr 2013 07:01:11 -0700 (PDT) X-AuditID: c1b4fb25-b7f366d000004d10-f0-517e7d2683d8 Received: from esessmw0256.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw2.ericsson.se (Symantec Mail Security) with SMTP id B2.1B.19728.62D7E715; Mon, 29 Apr 2013 16:01:10 +0200 (CEST) Received: from [150.132.141.119] (153.88.115.8) by esessmw0256.eemea.ericsson.se (153.88.115.97) with Microsoft SMTP Server id 8.3.279.1; Mon, 29 Apr 2013 16:01:10 +0200 Message-ID: <517E7D25.2030706@ericsson.com> Date: Mon, 29 Apr 2013 16:01:09 +0200 From: =?windows-1252?Q?Stefan_H=E5kansson_LK?= User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: "rtcweb@ietf.org" Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrKJMWRmVeSWpSXmKPExsUyM+Jvra5abV2gwdeVKhZr/7WzOzB6LFny kymAMYrLJiU1J7MstUjfLoErY8OhHWwFP7grTrZcZmtg/MjVxcjJISFgIrGyZxsjhC0mceHe erYuRi4OIYFTjBK/zn5khXDWMkrc/TyDDaSKV0BbYsWO32A2i4CqxLnb34C6OTjYBIIlZkwx AgmLCkRJ/Hu7mxGiXFDi5MwnLCC2iIC6xOWHF9hBZgoLzANacPkUK0gvs4C9xIOtZSA1zALy EtvfzmEGsYUEdCXevb7HOoGRbxaSUbMQOmYh6VjAyLyKkT03MTMnvdxoEyMwaA5u+a26g/HO OZFDjNIcLErivDOkKgOFBNITS1KzU1MLUovii0pzUosPMTJxcEo1MOpUt4ZcvzVvr+/i3z65 CfXfWL5L7QuJPbRF9OkVt1DBs9bKBdVzK7lEhDds+ePw58tb249Htx1Y9Tn3wIMd1lf45izL 4Tg2o2jTxrUNGw+cmsv0g906194hPXev5amAtceNg6++WXsyqmCnPldU9U+vrdHyn2Y+L155 41zRnCvxwsLONrJpe02UWIozEg21mIuKEwFFCc/R6AEAAA== Subject: [rtcweb] =?windows-1252?q?WG_last_call_comments_on_use-case_and_r?= =?windows-1252?q?equirement_document=2C_=93Emergency_Services=94?= X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 14:01:13 -0000 This relates to the comments to the WG last call of the use-cases and requirements document [1]. The topic in this mail is Emergency Services. This was discussed in [2] - [16] (i hope I found all the relevant mails, please correct me if I missed any), and my conclusion is that we should not add specific use-cases or requirements for Emergency Services. Stefan [1] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06136.html [2] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06160.html [3] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06226.html [4] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06227.html [5] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06229.html [6] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06231.html [7] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06232.html [8] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06239.html [9] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06230.html [10] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06237.html [11] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06242.html [12] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06243.html [13] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06244.html [14] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06246.html [15] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06267.html [16] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06268.html From stefan.lk.hakansson@ericsson.com Mon Apr 29 07:02:15 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7180021F9DB9 for ; Mon, 29 Apr 2013 07:02:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.949 X-Spam-Level: X-Spam-Status: No, score=-5.949 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_SE=0.35, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4bruvmHZE0G0 for ; Mon, 29 Apr 2013 07:02:15 -0700 (PDT) Received: from mailgw2.ericsson.se (mailgw2.ericsson.se [193.180.251.37]) by ietfa.amsl.com (Postfix) with ESMTP id 79ED421F9D80 for ; Mon, 29 Apr 2013 07:02:14 -0700 (PDT) X-AuditID: c1b4fb25-b7f366d000004d10-ca-517e7d651733 Received: from esessmw0247.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw2.ericsson.se (Symantec Mail Security) with SMTP id 09.3B.19728.56D7E715; Mon, 29 Apr 2013 16:02:13 +0200 (CEST) Received: from [150.132.141.119] (153.88.115.8) by esessmw0247.eemea.ericsson.se (153.88.115.94) with Microsoft SMTP Server id 8.3.279.1; Mon, 29 Apr 2013 16:02:13 +0200 Message-ID: <517E7D65.7020805@ericsson.com> Date: Mon, 29 Apr 2013 16:02:13 +0200 From: =?windows-1252?Q?Stefan_H=E5kansson_LK?= User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: "rtcweb@ietf.org" Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrCJMWRmVeSWpSXmKPExsUyM+JvrW5qbV2gwcUp2hZr/7WzOzB6LFny kymAMYrLJiU1J7MstUjfLoErY0HDR7aC+fwVO2acZ2lg/MjTxcjJISFgIrHq31kmCFtM4sK9 9WxdjFwcQgKnGCW2v25mhHDWMkpceLmZuYuRg4NXQFviy4JkkAYWAVWJK7eOsIOE2QSCJWZM MQIJiwpESfx7u5sRxOYVEJQ4OfMJC4gtIqAucfnhBXaQkcICLYwSf3b9AutlFrCXeLC1DKSG WUBeonnrbGYQW0hAV+Ld63usExj5ZiEZNQuhYxaSjgWMzKsY2XMTM3PSy402MQJD5uCW36o7 GO+cEznEKM3BoiTOO0OqMlBIID2xJDU7NbUgtSi+qDQntfgQIxMHp1QDo5XficQvpysT3Kal zZvvOlXl2UQeBn6hmLvZP+PWTbGatVhoS9V6qSsxwVqbbRisTinNvxe466C5zaczMa0PmPme vtuZktGW+FFmxoSpU/Z4dTPN8SrqyFDxiU9V4Hpy5F3binuSc+I68/OtPkTsurT5Ep/CvojN x+JkRRc2C5vP2y3ULLLVQImlOCPRUIu5qDgRACiC89nnAQAA Subject: [rtcweb] =?windows-1252?q?WG_last_call_comments_on_use-case_and_r?= =?windows-1252?q?equirement_document=2C_=93Real-time_text=94?= X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 14:02:15 -0000 This relates to the comments to the WG last call of the use-cases and requirements document [1]. The topic in this mail is Real-time text. This was discussed in [2] - [8] (i hope I found all the relevant mails, please correct me if I missed any). My reading of the discussion is that although there was some interest in the use-case it was shown that it can be implemented on top of the existing WebRTC environment and thus does not necessary drive any new requirements. The counter argument was the need for common interoperability for real-time text rather than silos, especially in the context of emergency services. However as there no consensus on any special requirements regarding emergency services it doesn't appear that real-time text support requires that either. This can be summarized to that there was no consensus for additional requirements and the basic functionality can clearly be implemented using JS and suitable data transport,, and there is no need to add a specific use-case for real-time text. Another way to view this is that the real-time text use-case is a "telephony terminal" use-case with the codec being something like T.140, which would narrow the discussion to a codec discussion. Anyway, with the current input I don’t think there is support to add a new use-case on “Real-time text”. Stefan [1] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06136.html [2] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06160.html [3] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06161.html [4] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06202.html [5] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06212.html [6] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06213.html [7] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06224.html [8] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06228.html From stefan.lk.hakansson@ericsson.com Mon Apr 29 07:04:16 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2038221F9DCE for ; Mon, 29 Apr 2013 07:04:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.949 X-Spam-Level: X-Spam-Status: No, score=-5.949 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HELO_EQ_SE=0.35, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ua6x6ACn8Z-M for ; Mon, 29 Apr 2013 07:04:15 -0700 (PDT) Received: from mailgw7.ericsson.se (mailgw7.ericsson.se [193.180.251.48]) by ietfa.amsl.com (Postfix) with ESMTP id EC42621F9DC4 for ; Mon, 29 Apr 2013 07:04:14 -0700 (PDT) X-AuditID: c1b4fb30-b7f266d000000cb5-5f-517e7dddc0e2 Received: from esessmw0191.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw7.ericsson.se (Symantec Mail Security) with SMTP id 0D.F0.03253.DDD7E715; Mon, 29 Apr 2013 16:04:14 +0200 (CEST) Received: from [150.132.141.119] (153.88.115.8) by esessmw0191.eemea.ericsson.se (153.88.115.85) with Microsoft SMTP Server id 8.3.279.1; Mon, 29 Apr 2013 16:04:13 +0200 Message-ID: <517E7DDD.5030705@ericsson.com> Date: Mon, 29 Apr 2013 16:04:13 +0200 From: =?windows-1252?Q?Stefan_H=E5kansson_LK?= User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: "rtcweb@ietf.org" Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrCJMWRmVeSWpSXmKPExsUyM+Jvre692rpAg+6LnBZr/7WzOzB6LFny kymAMYrLJiU1J7MstUjfLoErY8OaiIJT3BX/Tz9hb2C8wdnFyMkhIWAicfL/SzYIW0ziwr31 QDYXh5DAKUaJS69XQzlrGSUeT17FBFLFK6AtcerESVYQm0VAVeLlzBbGLkYODjaBYIkZU4xA wqICURL/3u5mhCgXlDg58wkLiC0ioC5x+eEFdpCZwgLzGSXadq5hAellFrCXeLC1DKSGWUBe onnrbGYQW0hAV+Ld63usExj5ZiEZNQuhYxaSjgWMzKsY2XMTM3PSy803MQJD5uCW3wY7GDfd FzvEKM3BoiTOO0OqMlBIID2xJDU7NbUgtSi+qDQntfgQIxMHp1QDI9tilQnP9zeb8jKphu3Z UvBK0ee1eLPEtNd39qj4xqqEb7zh9lLO9nxH60Ofg+dyPzMv69zDdupR1GFrVk6G9/W7Nz9b t/yAyxGe9vmrf9zOOv/1i83+mCnLRJfy7Dgm++rT78tWKdIWmnJa+suDfY65dl4s/vxv65c3 02ZOYjvxVuul3yPxVlslluKMREMt5qLiRADDUi0q5wEAAA== Subject: [rtcweb] =?windows-1252?q?WG_last_call_comments_on_use-case_and_r?= =?windows-1252?q?equirement_document=2C_=93No_solution_defined=94?= X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 14:04:16 -0000 This relates to the comments to the WG last call of the use-cases and requirements document [1]. The topic in this mail is the feedback that for some use-cases and requirements no solution has been defined yet. This was brought up in [2], with responses in [3] and [4]. My thinking here is that the bulk of this document was developed a long time ago when this effort started out. The use-cases, and derived requirements, reflect what was considered important at that time. We basically have two options here: either we publish that document, including use-cases/requirements that we have not developed solutions to yet, early (knowing we may not meet all use-cases/requirements), or we go for a later publication where we update the document to reflect what we have actually designed. My preference would be to go for the early publication, and to use this document later in the process to see what requirements we do meet, and what requirements we don’t meet. (This is basically my proposal for use of this document, referring again to Bernard’s mail on 2119 language [5]). Stefan [1] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06136.html [2] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06180.html [3] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06187.html [4] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06200.html [5] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06181.html From stefan.lk.hakansson@ericsson.com Mon Apr 29 07:05:49 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C2AFA21F9DD8 for ; Mon, 29 Apr 2013 07:05:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.949 X-Spam-Level: X-Spam-Status: No, score=-5.949 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_SE=0.35, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HtQ9ANSoTl72 for ; Mon, 29 Apr 2013 07:05:49 -0700 (PDT) Received: from mailgw1.ericsson.se (mailgw1.ericsson.se [193.180.251.45]) by ietfa.amsl.com (Postfix) with ESMTP id 2036421F9DC8 for ; Mon, 29 Apr 2013 07:05:47 -0700 (PDT) X-AuditID: c1b4fb2d-b7f316d0000028db-f7-517e7e3b60d9 Received: from esessmw0256.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw1.ericsson.se (Symantec Mail Security) with SMTP id 1A.98.10459.B3E7E715; Mon, 29 Apr 2013 16:05:47 +0200 (CEST) Received: from [150.132.141.119] (153.88.115.8) by esessmw0256.eemea.ericsson.se (153.88.115.97) with Microsoft SMTP Server id 8.3.279.1; Mon, 29 Apr 2013 16:05:47 +0200 Message-ID: <517E7E3A.3090300@ericsson.com> Date: Mon, 29 Apr 2013 16:05:46 +0200 From: =?windows-1252?Q?Stefan_H=E5kansson_LK?= User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: "rtcweb@ietf.org" Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrCJMWRmVeSWpSXmKPExsUyM+Jvra51XV2gwYFDghZr/7WzOzB6LFny kymAMYrLJiU1J7MstUjfLoErY82jtWwFh3kqNh2/ytTAOJ2ri5GTQ0LARGLpu9lsELaYxIV7 64FsLg4hgVOMEhf+vWMESQgJrGWUOL3YBMTmFdCWeHhzKROIzSKgKrFwezNQAwcHm0CwxIwp RiBhUYEoiX9vdzNClAtKnJz5hAXEFhFQl7j88AI7yHxhgQWMEqtftoP1MgvYSzzYWgZSwywg L7H97RxmiLW6Eu9e32OdwMg3C8moWQgds5B0LGBkXsXInpuYmZNebriJERgyB7f81t3BeOqc yCFGaQ4WJXHe6VKVgUIC6YklqdmpqQWpRfFFpTmpxYcYmTg4pRoYp14+PIVfb+fNuNcWgjuC FizsneBbJVPW/Mk9/HFPeVrbtPti7OWZX05PsFu+4bNVf5lgIbv+N3GfwmtN89rdDY65nXU+ 8rrrgHxNuB3vt8dndszeJtso5t4bvvXB/OYEnbnHzjXvTFR0lZ78oubwfK/fE6qdgg75Jl02 Yt275M2OFdPmShjtVGIpzkg01GIuKk4EANr8OtvnAQAA Subject: [rtcweb] =?windows-1252?q?WG_last_call_comments_on_use-case_and_r?= =?windows-1252?q?equirement_document=2C_=93multiple_resolutions=94?= X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 14:05:49 -0000 This relates to the comments to the WG last call of the use-cases and requirements document [1]. There is a use-case (4.3.3) detailing the use of multiple resolutions of the data from one single source, with three options on how to meet that mentioned (scalable codec, simulcast and transcoding). There has been a request ([2]) to clarify which method(s) that should be mandatory, but no conclusion yet. To recap, the use case is about a multiparty video (and audio of course) communication session using a central node. At the screen of each endpoint/user, one video is displayed on a large surface, with other videos are shown as (live) thumbnails. Which video to show at the large display surface is depending on speech activity; the video from the endpoint with currently talking user(s) is shown on the large surface - and this will usually change frequently during the session. This selection is handled by the central node which has access to all video and audio streams. I think this is a quite common model, used by many services. The current draft list three ways to support this use-case (use scalable video codecs, transcode in the central node, or use simulcast), but there are no requirements that back this up. We should pick at least one solution that must be supported, and then derive the corresponding requirements. I am a proponent for simulcast as solution for this use-case. Stefan [1] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06136.html [2] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06157.html From stefan.lk.hakansson@ericsson.com Mon Apr 29 07:07:05 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0B5B021F9080 for ; Mon, 29 Apr 2013 07:07:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.949 X-Spam-Level: X-Spam-Status: No, score=-5.949 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_SE=0.35, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KMgqHgyZGgn9 for ; Mon, 29 Apr 2013 07:07:04 -0700 (PDT) Received: from mailgw7.ericsson.se (mailgw7.ericsson.se [193.180.251.48]) by ietfa.amsl.com (Postfix) with ESMTP id B23C421F99EC for ; Mon, 29 Apr 2013 07:07:01 -0700 (PDT) X-AuditID: c1b4fb30-b7f266d000000cb5-b0-517e7e7d9b98 Received: from esessmw0184.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw7.ericsson.se (Symantec Mail Security) with SMTP id 4C.51.03253.D7E7E715; Mon, 29 Apr 2013 16:06:54 +0200 (CEST) Received: from [150.132.141.119] (153.88.115.8) by esessmw0184.eemea.ericsson.se (153.88.115.82) with Microsoft SMTP Server id 8.3.279.1; Mon, 29 Apr 2013 16:06:53 +0200 Message-ID: <517E7E7D.1040905@ericsson.com> Date: Mon, 29 Apr 2013 16:06:53 +0200 From: =?windows-1252?Q?Stefan_H=E5kansson_LK?= User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: "rtcweb@ietf.org" Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrMJMWRmVeSWpSXmKPExsUyM+JvrW5dXV2gwfezzBZr/7WzOzB6LFny kymAMYrLJiU1J7MstUjfLoEr4/61PsaCLumKc83vWRoYr4l3MXJySAiYSBz6uIwFwhaTuHBv PVsXIxeHkMApRolPpyaxQjhrGSUaZ6wGynBw8ApoS1yalgZisgioSmzv4QMx2QSCJWZMMQIZ IyoQJfHv7W5GEJtXQFDi5MwnYONFBNQlLj+8wA4yUVhgNqPE4yPvwSYyC9hLPNhaBlLDLCAv 0bx1NjOILSSgK/Hu9T3WCYx8s5CMmoXQMQtJxwJG5lWM7LmJmTnp5eabGIEBc3DLb4MdjJvu ix1ilOZgURLnnSFVGSgkkJ5YkpqdmlqQWhRfVJqTWnyIkYmDU6qBUdaSJ9nuiPFDq+6j0wIz FdwVDheudBZhCQ+5yOK/5tRvyxPCaQ+fVP7mNFhxR9l55vfcl6fvcZ2/x6Vpkizm/sPowobD Ju1Wf6pYP+zJSE1yTQjtM/7o36blfMl6gqK0xc+c7MKjRw5uX6k5IeRjusim17clqrJebI86 cfVh1zwb6cxDZ1/6KrEUZyQaajEXFScCAI5e5OzmAQAA Subject: [rtcweb] =?windows-1252?q?WG_last_call_comments_on_use-case_and_r?= =?windows-1252?q?equirement_document=2C_=93hide_IP_address=94?= X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 14:07:05 -0000 This relates to the comments to the WG last call of the use-cases and requirements document [1]. This is a discussion starting from A25 “ It must be possible for the application to refrain from exposing the IP address”. Discussed a lot ([2]-[24]). I think there are several aspects here that are discussed, and we need to separate them to enable a more fruitful discussion. The browser being configured to not reveal addresses applies to at least the following cases: 1) Private domain with NAT where the internal structure should be hidden can configure their browsers to not reveal that inner structure by only providing relay or NAT external candidates, none from the private space. 2) An user wants to avoid having their actual location revealed to any other user of the same service. 3) The user wants to be prevent revealing their point of attachment to the network even to the web service. This results in different functional requirements 1) Requires browser support but also configuration to determine which candidates are ok and which are not. It may be fine with server reflexive candidates and not only relay candidates 2) A browser could help, but is not required for this. The browser may have clearer understanding from where the different candidates were gotten and thus understand if they reflect a privacy issue or not. 3) Needs additional anonymity service, like TOR and something that prevents any actual interface addresses to be revealed to the web-app. I think 3) is out of scope (that is how I interpret the discussion), but it is not clear to me if we want to meet 1) or 2) or both with this requirement. I would like input on this topic. Stefan [1] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06136.html [2] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06198.html [3] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06219.html [4] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06220.html [5] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06221.html [6] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06222.html [7] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06223.html [8] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06233.html [9] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06234.html [10] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06235.html [11] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06236.html [12] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06238.html [13] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06240.html [14] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06241.html [15] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06245.html [16] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06247.html [17] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06248.html [18] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06253.html [19] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06256.html [20] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06259.html [21] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06260.html [22] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06261.html [23] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06262.html [24] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06180.html From richard.ejzak@alcatel-lucent.com Mon Apr 29 07:11:49 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 203AF21F9D5B for ; Mon, 29 Apr 2013 07:11:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.599 X-Spam-Level: X-Spam-Status: No, score=-10.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MDUVI5K5lqd6 for ; Mon, 29 Apr 2013 07:11:47 -0700 (PDT) Received: from ihemail4.lucent.com (ihemail4.lucent.com [135.245.0.39]) by ietfa.amsl.com (Postfix) with ESMTP id 610FE21F9820 for ; Mon, 29 Apr 2013 07:11:47 -0700 (PDT) Received: from us70uusmtp4.zam.alcatel-lucent.com (h135-5-2-66.lucent.com [135.5.2.66]) by ihemail4.lucent.com (8.13.8/IER-o) with ESMTP id r3TEBdIi011790 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Mon, 29 Apr 2013 09:11:40 -0500 (CDT) Received: from US70UWXCHHUB01.zam.alcatel-lucent.com (us70uwxchhub01.zam.alcatel-lucent.com [135.5.2.48]) by us70uusmtp4.zam.alcatel-lucent.com (GMO) with ESMTP id r3TEBdY6021307 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Mon, 29 Apr 2013 10:11:39 -0400 Received: from US70UWXCHMBA05.zam.alcatel-lucent.com ([169.254.10.44]) by US70UWXCHHUB01.zam.alcatel-lucent.com ([135.5.2.48]) with mapi id 14.02.0247.003; Mon, 29 Apr 2013 10:11:38 -0400 From: "Ejzak, Richard P (Richard)" To: Randell Jesup , "rtcweb@ietf.org" Thread-Topic: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN Thread-Index: AQHOPxk/vGZCo0bYYE+LkWxcJO5/cpjlwv8AgACZxICAAFNvAIABBywAgAAJMQCAAQ8YgIAAPkQAgAQ0J1A= Date: Mon, 29 Apr 2013 14:11:38 +0000 Message-ID: <03FBA798AC24E3498B74F47FD082A92F3BB9C130@US70UWXCHMBA05.zam.alcatel-lucent.com> References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <5174C8D2.40504@matthew.at> <5177F7EE.1010909@matthew.at> <5179A362.2000309@jesup.org> <517A86CB.5020305@matthew.at> <517ABB06.5070807@jesup.org> In-Reply-To: <517ABB06.5070807@jesup.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [135.5.27.18] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.57 on 135.245.2.39 Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 14:11:49 -0000 After remaining neutral during most of this discussion about the need for O= PEN, I've finally come to the conclusion that Matthew is right. The only t= hing the OPEN provides is the label, which is just an opaque string with no= meaning to the browser or any intermediaries. It only has application sig= nificance. If this is the case, why not just use stream id? What can you = possibly do with label that you can't do with pre-assigned stream ids (this= is a serious question to Randell since it is fundamental to whether we nee= d OPEN)? Since label only has meaning when both browsers run the same appl= ication, what does it matter if you agree on a set of opaque strings to cor= respond to various functions or just agree on a set of stream ids for these= functions? It doesn't change the complexity of the code and it doesn't ev= en change the readability of the code if you just enumerate the reserved st= ream ids and "label" them in the code. =20 You can even reserve stream ids in odd/even pairs so that either end can in= itiate them. You can reserve blocks of stream ids if you want multiple ins= tances of the same type of DC. I don't see any significant limitation here= . Getting rid of OPEN eliminates any issues around their handling in the unor= dered case. Getting rid of OPEN does not preclude use of new subprotocols as needed and= does not preclude use of any other signaling to negotiate use of DataChann= els between heterogeneous applications. OPEN does not help in this case an= yway. > On 4/25/2013 12:36 PM, Randell Jesup wrote: > On 4/26/2013 9:53 AM, Matthew Kaufman wrote: > > On 4/25/2013 2:42 PM, Randell Jesup wrote: > >> On 4/25/2013 5:10 PM, Cullen Jennings (fluffy) wrote: > >>> So with my co-chair hat on here... > >>> > >>> It seems we have been around the need for OPEN several times and > >>> have come to consensus on it in the past. Can someone please: > >>> > >>> 1) summarize the arguments that in the past that lead us to think > we > >>> need OPEN > >> > >> The Open message has some important and useful properties: > >> > >> 1) It's easier to work with. JS isn't an ideal language for writing > >> network protocols, especially for non-network-programmers (i.e. a > >> large portion of the expected developer community). Open makes it > >> really easy for a developer to get the type of bidirectional stream > >> them want with little fuss, and in a manner that maps easily to APIs > >> they're already used to (e.g. WebSockets). In many cases the label > >> field will avoid the JS programmer having to build their own > >> mini-protocol to identify their channels (and this is especially > >> painful for them if it's an unreliable channel). > > > > Easier how? The initiating side needs to create their object without > > the benefit of the contents of an open message. If a JS developer > > isn't smart enough to set up the channel parameters they want at the > > initiating end, then there's nothing we can do for them. There's then > > several ways forward after that, including "the other side does the > > same thing to create their end" (my preference) and "the parameters > > are transported using the existing SDP O/A mechanism to the far end" > > (generally how the WG solves this kind of problem). > > > > As far as I can tell, the one useful thing in the OPEN message is the > > label (as I pointed out in my very first inquiry about why anyone > > thought it was needed), and yet the label is allowed to be null, so > in > > that case how can it be helpful? >=20 > It's helpful if you need it (if you're opening a number of channels, > such as one per participant in a conference). Protocol is also helpful > (note it's in the dictionary and is also optional); both for cross- > application channels and for within an app to indicate what handling > logic the channel should feed. >=20 > // pseudo-codey: > function called_from_ondatachanne(event) { > channel =3D event.channel; > if (channel.protocol =3D=3D "file transfer") { channel.onmessage =3D > handle_incoming_file; } > else if (channel.protocol =3D=3D "chat") {chat =3D new > chat_instance(channel.label); channel.onmessage =3D chat.incoming; } } >=20 > > > >> > >> 2) It makes it possible to have different applications exchange > data, > >> by having an IANA-registered protocol name, like WebSockets (and > >> there was strong agreement on it's being needed for that at > >> Atlanta.) With external-negotiation-only, it would be very hard for > >> different apps to interoperate, since they'd need to agree on > >> negotiation protocols as well, which are likely to be highly > >> divergent between apps. > > > > If we went with "negotiated via the SDP O/A mechanism" then we could > > go to our favorite SDP-defining WG and have a negotiation protocol > > that is standardized, so not divergent at all between apps. >=20 > We also don't have one that's divergent by using Open (and we leave the > option of externally negotiating or pre-defining channels). And SDP is > at least one signaling-RTT to complete, plus a bunch of logic to handle > matching everything up (what if channels disappear in the offer or > answer, or in an offer or answer they change properties? What if the > signaling channel is slow or unavailable any more (server rebooted, > server has network issues, etc)? >=20 > I'm not saying there aren't answers/solutions to all these. But those > answers and solutions would need to be speced out or at least > understood, and the code to handle all of them is likely to be similar > in scope (though quite different in detail). And the less done in SDP, > the better IMHO; I have no wish to increase our reliance on SDP. >=20 > >> > >> 3) The Open message, being in-channel, reliable and in-order, makes > >> the issue that was the genesis of this thread (what to do with data > >> that arrives unexpectedly) simpler. > > > > I disagree. It increases the number of possible states... there's > > cases where the OPEN message arrives but the application doesn't want > > to be receiving that data, and the cases where the OPEN message > > doesn't arrive but the application does want the data that is already > > arriving. Both of those states don't exist if there's no OPEN > message. >=20 > My point was you need to decide what to do with that data regardless of > if the channel gets created with a delayed OPEN or with a delayed > external negotiation. And with OPEN, those cases don't even arise for > ordered channels. >=20 > > > >> With Open, only degenerate cases can cause more than a relatively > >> small amount of data to be buffered. > > > > Sure, but those degenerate cases occur many times per day on the real > > Internet. >=20 > I doubt that. The degenerate cases for Open require that all the open > packets get lost, while a sizable amount of non-open packets get > through > - and after a time, SCTP will fail the entire association if reliable > data isn't getting through. Plus, as I indicated, we can also have > limits on time and/or amount of data buffered. >=20 > Also: nothing *requires* that an application send data immediately on > onopen. An application can institute it's own handshake trivially: > function my_ondatachannel(event) { > event.channel.send(ok_to_start_sending); ... } >=20 > > > >> With external notification, the external negotiation channel can > fail > >> (or be very slow), or the app can have a bug and fail to install the > >> negotiated values, leading to larger or unbounded buffering > >> requirements - or you punt the problem to the application by > >> delivering the data, but the application is facing the same > conundrum > >> of buffer it or throw it away. > >> > >>> 2) sketch out the range of possible solutions to deal with > >>> unexpected data before the OPEN > >> > >> > >> The issue exists regardless of whether Open is used or external > >> negotiation (and in fact is much simpler for Open). > >> > >> *tl;dr: *I'm ok with any setting of maximum sizes and/or times that > >> would not adversely impact temporary buffering for normal cases with > >> Open of unordered channels. This is option C below. I also would be > >> ok with B, but I realize others may not be. > >> > >> Regardless of supporting Open or not, any external negotiation of > >> dynamic channels must use one of these: > >> > >> A) a 2-or-3-way handshake so the sender knows the receiver is ready > >> to receive the data on the specified channel before sending it, or > >> > >> B) unbounded buffering of data if the external negotiation messages > >> are delayed (again, what we're discussing in this thread), or > >> > >> C) bounded buffering of data (bounded by time, size or both), with > >> data being dropped and the channel closed if the limits are > exceeded, or > >> > >> D) deliver unexpected data to the application, which will do .... I > >> don't know what with it. > >> > >> For (D), the application will likely drop it on the floor (leading > to > >> hard-to-test-for problems if the channel is later configured by Open > >> or external negotiation), or buffer it waiting for the channel to > open. > >> > >> Supporting Open or not has little bearing on these scenarios > > > > So if that's true, then why do we need it? >=20 > This was a discussion of "what to do with data that arrives > unexpectedly > (i.e. before Open, or before the application installed the result of an > external negotiation); this was the original point of the thread before > you decided to question the selection of Open as a message. >=20 > The caveat at the top was "external negotiation of dynamic channels > must > do one of these" regardless of whether Open is supported. The options > for use with Open are the same, but the amount of data that can be > buffered is smaller (since with external negotiation there are no > limits > on the amount that could attempt to be queued -- the same applies SDP > if > you allow the sender to send data before the negotiation is complete; > SDP is effectively a form of external negotiation). >=20 > > > >> -- and in fact, since Open is in-channel, reliable, and ordered, it > >> reduces the problem set (when Open is used) to only unordered > >> channels (in ordered channels Open will always be first). > >> > >> Buffering unexpected data on channels (options B or C) is useful. It > >> means that in the external negotiation case, one side asking for a > >> new channel to open by some private means doesn't need to wait to > >> start sending data on that channel. > > > > Of course this is different from the TCP model, where the buffering > > happens at the *sender* until the handshake is complete. >=20 > Ok, but this isn't TCP. And handshakes (and the resultant delay before > onopen fired) were eliminated in order to respond to the requests of > multiple people, giving us a 0-RTT declarative protocol where you can > send immediately, which will help apps that need to exchange data > quickly at the start of a connection. >=20 > > The problem here is that we have an existing mechanism inside of SCTP > > and then we're adding another layer on top of that which is neither > > inside SCTP (where it probably belongs) or under the application > > developer's control (where I'd like to see it, if the data transport > > protocol can't have it), and this layer conflicts with what both of > > those might be doing. >=20 > If you're referring to Open, you can totally ignore Open and not use it > in your datachannels, and use all external negotiation or pre-defined > channels. If you want, you can just pre-define N open channels that > the > other side can then use to send data to you, and nothing will ever be > buffered, and you can handle it all yourself. >=20 > > > >> Note that with external negotiation (possibly on a non p2p path, > like > >> via signaling), the receiver might not know what to install for a > >> short while, especially if there's a routing issue or server issue > >> (not a problem that happens with Open). > > > > Which is fine if the sender doesn't start sending (like TCP). Or if > > the transport protocol itself handles the delivery of the channel > > metadata. (Which is what SCTP, or whatever transport we choose for > > RTCWEB, should do) then you just handle the label and whatever other > > metadata the receiver would like to know at that layer. >=20 > I.e. data streams from RTMFP, I take it? ;-) >=20 > > > >> > >> Since normal Open cases have very little chance of triggering this > >> problem (triggering buffering), some arbitrary size limit seems > >> reasonable (option C). Often in network protocols there are small > >> buffers (4, 16, 64KB). I prefer a larger value of say 256KB so that > >> apps using external negotiation can just send largish data > >> immediately - and note: actually buffering data is still an unlikely > >> occurrence even in most external negotiation cases. If people want > >> to bikeshed on the buffersize or timeout, that's fine. ;-) > >> > >> Also, external negotiation is the only case where more than a > trivial > >> amount of data can "pile up" in the buffer waiting for the receiving > >> side to finish it's side of the negotiation (i.e. if your external > >> negotiation channel fails or the app has a brain fart). > >> > >> > > > > Another great argument for having this negotiation happen within the > > transport itself. >=20 > If you want to argue for replacing SCTP as the base layer - we made > that > decision a good long while ago. And there's a good, maintained, > BSD-licensed implementation - and the authors of that are working with > us here in designing a DataChannel protocol to ride on top of it. If > you want to argue that the layer on top of SCTP should be handshaked > once again (as it was until people objected) that's up to you to make > the case for. >=20 > IMO: > I'd like to avoid continuing to circle through the range of all > possible > protocols one at a time, repeating every few months. I'll assert we > can > bikeshed on this until we all retire, and we'll never have something > that makes everyone entirely happy (unless most people get tired and > stop caring). All solutions have tradeoffs; none is perfect for all > use-cases and users. We arrived at a proposal that had general > agreement in the room to move forward with per the consensus call, and > I'm preparing a WG draft in response to that. Some may like it more > and > some less, but there was agreement that people could work with it. >=20 > -- > Randell Jesup > randell-ietf@jesup.org >=20 > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From stefan.lk.hakansson@ericsson.com Mon Apr 29 07:12:10 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4907821F9E30 for ; Mon, 29 Apr 2013 07:12:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.949 X-Spam-Level: X-Spam-Status: No, score=-5.949 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HELO_EQ_SE=0.35, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9CiRzm9BdS7Z for ; Mon, 29 Apr 2013 07:12:09 -0700 (PDT) Received: from mailgw2.ericsson.se (mailgw2.ericsson.se [193.180.251.37]) by ietfa.amsl.com (Postfix) with ESMTP id 2334521F9D75 for ; Mon, 29 Apr 2013 07:12:08 -0700 (PDT) X-AuditID: c1b4fb25-b7f366d000004d10-23-517e7fb8a3e7 Received: from esessmw0247.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw2.ericsson.se (Symantec Mail Security) with SMTP id 42.AC.19728.8BF7E715; Mon, 29 Apr 2013 16:12:08 +0200 (CEST) Received: from [150.132.141.119] (153.88.115.8) by esessmw0247.eemea.ericsson.se (153.88.115.94) with Microsoft SMTP Server id 8.3.279.1; Mon, 29 Apr 2013 16:12:01 +0200 Message-ID: <517E7FB1.8060009@ericsson.com> Date: Mon, 29 Apr 2013 16:12:01 +0200 From: =?windows-1252?Q?Stefan_H=E5kansson_LK?= User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: "rtcweb@ietf.org" Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrEJMWRmVeSWpSXmKPExsUyM+Jvre6O+rpAg/tfBC3W/mtnd2D0WLLk J1MAYxSXTUpqTmZZapG+XQJXxvX3u5kKrglXvN76kqWB8bFgFyMnh4SAicS6Q+eZIWwxiQv3 1rN1MXJxCAmcYpSYeX4PlLOWUeLTg0b2LkYODl4BbYmzXypAGlgEVCWu75/PCBJmEwiWmDHF CCQsKhAl8e/tbkYQm1dAUOLkzCcsILaIgLrE5YcXwKYIC9RK/H6cB2IyC9hLPNhaBlLBLCAv 0bx1Ntg1QgK6Eu9e32OdwMg3C8mgWQgds5B0LGBkXsXInpuYmZNebrSJERguB7f8Vt3BeOec yCFGaQ4WJXHeGVKVgUIC6YklqdmpqQWpRfFFpTmpxYcYmTg4pRoYe7dMvnGMZ0Otq+qCBb1R qwT7Ejuv6WmvU1RVveF/o/hkEnPMZ92IcJe8jrcSq23e8d7z7l3h/0vm8RaTS051s9urGGyq FRSiz/IaWZqe+pFa+ESnLOfszlliSVMivCu9p3uul/Yptcs/9aTl/AN/3alXF6+xdNm/8mSR 1/uG9t7Ihqt6O54psRRnJBpqMRcVJwIA3RAKNeUBAAA= Subject: [rtcweb] =?windows-1252?q?WG_last_call_comments_on_use-case_and_r?= =?windows-1252?q?equirement_document=2C_=93Details=94?= X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 14:12:10 -0000 This relates to the comments to the WG last call of the use-cases and requirements document [1]. This is the last mail in a series of mails related to that call that I plan to send. A lot of more detailed comments have been posted, and I plan to take them into account when updating: * W3C requirements: These are part of the document, but it will be clarified why, and I will move them to an appendix ([2]-[4]) * Clarifications proposed for F3, F5 and F23: [5] and [6] * Clarification of F3: [7] - [10] * Remove the word “Skype” [11] * Clarifying a lot of requirements discussed in [12] - [16] * Other requirements are discussed, and at least partially clarified, in [17] - [25]. Stefan [1] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06136.html [2] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06192.html [3] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06193.html [4] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06196.html [5] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06137.html [6] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06138.html [7] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06181.html [8] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06191.html [9] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06197.html [10] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06218.html [11] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06159.html [12] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06182.html [13] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06190.html [14] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06208.html [15] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06198.html [16] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06219.html [17] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06180.html [18] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06187.html [19] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06189.html [20] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06200.html [21] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06201.html [22] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06206.html [23] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06215.html [24] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06216.html [25] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06217.html From ted.ietf@gmail.com Mon Apr 29 08:08:04 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5AA7521F9E39 for ; Mon, 29 Apr 2013 08:08:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6ptpWMKvoq08 for ; Mon, 29 Apr 2013 08:08:03 -0700 (PDT) Received: from mail-ie0-x232.google.com (mail-ie0-x232.google.com [IPv6:2607:f8b0:4001:c03::232]) by ietfa.amsl.com (Postfix) with ESMTP id 76E3721F9E2A for ; Mon, 29 Apr 2013 08:08:03 -0700 (PDT) Received: by mail-ie0-f178.google.com with SMTP id aq17so7289809iec.23 for ; Mon, 29 Apr 2013 08:08:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=DLoc/joTbAsV/pX/htjDJl5thnYgYoVNBOgOvO3CU/8=; b=PYRF36Pm28C86rXvASXsnUV1w8lkT2tISBefgHXpRDjgKoD/A6k1iyVNERZweC1SpU BByxkrKHbP74BWnhrENgSZoHPEP2aTXJpC6LLW2M3MjIxV57c/jr6BLqZ78jJlm+HTvr GDh41u4KfBPPAcyeNUen2z1gTpzqFqon3KubRg9FFwXSvvAYErG7/2tE26bNTcPfFnBu cy7sEMFJvmfOcRPan2Rm5o/FM+TeOHWSVHuZ7c3C5eMwtiIt4TWL1yGZAnMRHGCGkG0N Ad1DPULpd3yDfLV+phLeR0sM+KQup4SCRYVAOdzKbxuEQTlNgiPvQdRo4HyO0LGZNlP+ PmZw== MIME-Version: 1.0 X-Received: by 10.50.27.10 with SMTP id p10mr1194465igg.20.1367248083024; Mon, 29 Apr 2013 08:08:03 -0700 (PDT) Received: by 10.42.211.16 with HTTP; Mon, 29 Apr 2013 08:08:02 -0700 (PDT) In-Reply-To: <8AC9604B-CBC7-482E-A60E-0096A45CC9B6@iii.ca> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <5179BEEF.4000600@jesup.org> <517A0237.9030008@matthew.at> <8AC9604B-CBC7-482E-A60E-0096A45CC9B6@iii.ca> Date: Mon, 29 Apr 2013 08:08:02 -0700 Message-ID: From: Ted Hardie To: Cullen Jennings Content-Type: multipart/alternative; boundary=047d7b10cd294f029b04db8140f1 Cc: rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 15:08:04 -0000 --047d7b10cd294f029b04db8140f1 Content-Type: text/plain; charset=ISO-8859-1 Hi Cullen, Sorry for the delay in replying; it was a long transit back from Australia. Some comments in-line. On Fri, Apr 26, 2013 at 11:23 AM, Cullen Jennings wrote: > > On Apr 25, 2013, at 11:55 PM, Ted Hardie wrote: > > > On Thu, Apr 25, 2013 at 9:27 PM, Matthew Kaufman > wrote: > > O > > Yes, some gateway scenarios might be cheaper/easier with SDES, but I see > the primary use-cases for WebRTC to be browser-to-browser, not > browser-legacy. > > > > Just because the charter was mistakenly written that way doesn't mean it > is true. > > > > I remind you that the actual title of the group is: > > > > "Real-Time Communication in WEB-browsers (rtcweb)". While you may > disagree with the charter, please remember that it's not fundamentally a > prediction about what the eventual balance of flows will be. It's a > statement about where the balance of effort in the group should go. To me > as an individual, it implies that we should not make trade-offs that > optimize a non-browser use case at the expense of the browser use case > except in pretty extraordinary circumstances. > > > > regards, > > Ted, I think rtcweb is about a web brewer being able to communicate to > lots of things, not just one currently very small island. Our uses and > discussion from well before this WG was chartered have recognized that to > be successful, rtrcweb endpoints were going to need to be able to call > things other than web browsers. You were one of the people that pushed hard > on the non browser (but also not legacy) uses. > > The non-browser, non-legacy case I believe we need to be particularly aware of is the mobile application case. While many of those are based on web technologies, they are distributed as stand-alone apps. That means they can be WebRTC "protocol native" without have the same chrome as a browser. Mostly that means we can't depend on the *browser* as distinct element just because we're using web protocols. That is significantly different from the legacy use case. I also think it is different from the "future legacy" use case that others have referred to. > I agree with your point that the design of any new communication system > has to deal with the tradeoff between how it work with previous system and > how easy it is to build. However, in the case here, I tend towards trying > to make the a new system that can take advantage of an early network effect > by being able to talk to lots of existing things. So, this is trade-off that I suspect we disagree on. I recognize that interop with existing systems gets you early traction, but it also tends to force the new system to match the odd angles and corners of whatever existing system you choose to align with. Having watched what happened to SIP with the focus on PSTN interoperability, I think that too much focus on that legacy interoperability can lose you generality. Once that's lost (even in perception among the developer community), it's very difficult to get back. It think the system we're building now potentially has useful general properties, so I don't want to over-optimize to a legacy use case that limits that generality (by reducing its security or in other terms). YMMV, Ted --047d7b10cd294f029b04db8140f1 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi Cullen,

Sorry for the delay in replying; it was a long transit ba= ck from Australia.=A0 Some comments in-line.

On Fri, Apr 26, 2013 at 11:23 AM, Cullen Jennings <= ;fluffy@iii.ca> wrote:

On Apr 25, 2013, at 11:55 PM, Ted Hardie <ted.ietf@gmail.com> wrote:

> On Thu, Apr 25, 2013 at 9:27 PM, Matthew Kaufman <matthew@matthew.at> wrote:
> O
> Yes, some gateway scenarios might be cheaper/easier with SDES, but I s= ee the primary use-cases for WebRTC to be browser-to-browser, not browser-l= egacy.
>
> Just because the charter was mistakenly written that way doesn't m= ean it is true.
>
> I remind you that the actual title of the group is:
>
> "Real-Time Communication in WEB-browsers (rtcweb)". =A0While= you may disagree with the charter, please remember that it's not funda= mentally a prediction about what the eventual balance of flows will be. =A0= It's a statement about where the balance of effort in the group should = go. =A0 To me as an individual, it implies that we should not make trade-of= fs that optimize a non-browser use case at the expense of the browser use c= ase except in pretty extraordinary circumstances.
>
> regards,

Ted, I think rtcweb is about a web brewer being able to communi= cate to lots of things, not just one currently very small island. Our uses = and discussion from well before this WG was chartered have recognized that = to be successful, rtrcweb endpoints were going to need to be able to call t= hings other than web browsers. You were one of the people that pushed hard = on the non browser (but also not legacy) uses.


The non-browser, non-legacy case I believe we nee= d to be particularly aware of is the mobile application case.=A0 While many= of those are based on web technologies, they are distributed as stand-alon= e apps.=A0 That means they can be WebRTC "protocol native" withou= t have the same chrome as a browser.=A0 Mostly that means we can't depe= nd on the *browser* as distinct element just because we're using web pr= otocols.

That is significantly different from the legacy use case.=A0 I also thi= nk it is different from the "future legacy" use case that others = have referred to.

=A0
I agree with your point that the design of any new communication system has= to deal with the tradeoff between how it work with previous system and how= easy it is to build. However, in the case here, I tend towards trying to m= ake the a new system that can take advantage of an early network effect by = being able to talk to lots of existing things.

So, this is trade-off that I suspect we disagree on.=A0 I recogniz= e that interop with existing systems gets you early traction, but it also t= ends to force the new system to match the odd angles and corners of whateve= r existing system you choose to align with.=A0 Having watched what happened= to SIP with the focus on PSTN interoperability, I think that too much focu= s on that legacy interoperability can lose you generality.=A0 Once that'= ;s lost (even in perception among the developer community), it's very d= ifficult to get back.

It think the system we're building now potentially has useful gener= al properties, so I don't want to over-optimize to a legacy use case th= at limits that generality (by reducing its security or in other terms).

YMMV,

Ted
--047d7b10cd294f029b04db8140f1-- From bernard_aboba@hotmail.com Mon Apr 29 09:14:04 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BABAC21F9E11 for ; Mon, 29 Apr 2013 09:14:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.147 X-Spam-Level: X-Spam-Status: No, score=-102.147 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, MIME_8BIT_HEADER=0.3, SARE_SUB_ENC_UTF8=0.152, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GmiCip9+vkr0 for ; Mon, 29 Apr 2013 09:14:04 -0700 (PDT) Received: from blu0-omc3-s36.blu0.hotmail.com (blu0-omc3-s36.blu0.hotmail.com [65.55.116.111]) by ietfa.amsl.com (Postfix) with ESMTP id 0815E21F9E10 for ; Mon, 29 Apr 2013 09:14:03 -0700 (PDT) Received: from BLU405-EAS76 ([65.55.116.73]) by blu0-omc3-s36.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Mon, 29 Apr 2013 09:14:03 -0700 X-EIP: [42F/9c2yQNYGLCPLvxproOCG6dWiDpjG] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 References: <517E7E7D.1040905@ericsson.com> From: Bernard Aboba MIME-Version: 1.0 (1.0) In-Reply-To: <517E7E7D.1040905@ericsson.com> Date: Mon, 29 Apr 2013 09:14:03 -0700 To: =?utf-8?Q?Stefan_H=C3=A5kansson_LK?= X-OriginalArrivalTime: 29 Apr 2013 16:14:03.0725 (UTC) FILETIME=[911737D0:01CE44F4] Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] =?utf-8?q?WG_last_call_comments_on_use-case_and_requirem?= =?utf-8?b?ZW50IGRvY3VtZW50LCDigJxoaWRlIElQIGFkZHJlc3PigJ0=?= X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 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[127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6758821F9E5C for ; Mon, 29 Apr 2013 09:40:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -101.675 X-Spam-Level: X-Spam-Status: No, score=-101.675 tagged_above=-999 required=5 tests=[AWL=-0.472, BAYES_00=-2.599, MIME_QP_LONG_LINE=1.396, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YHIUEsG-ZAsM for ; Mon, 29 Apr 2013 09:40:54 -0700 (PDT) Received: from blu0-omc4-s19.blu0.hotmail.com (blu0-omc4-s19.blu0.hotmail.com [65.55.111.158]) by ietfa.amsl.com (Postfix) with ESMTP id DD37921F9E5A for ; Mon, 29 Apr 2013 09:40:53 -0700 (PDT) Received: from BLU405-EAS394 ([65.55.111.137]) by blu0-omc4-s19.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Mon, 29 Apr 2013 09:40:53 -0700 X-EIP: [SGvkrAoVyGEe5+Hmmy0xU5v0fsHZi72f] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <5174C8D2.40504@matthew.at> <5177F7EE.1010909@matthew.at> <5179A362.2000309@jesup.org> <517A86CB.5020305@matthew.at> <517ABB06.5070807@jesup.org> <03FBA798AC24E3498B74F47FD082A92F3BB9C130@US70UWXCHMBA05.zam.alcatel-lucent.com> From: Bernard Aboba MIME-Version: 1.0 (1.0) In-Reply-To: <03FBA798AC24E3498B74F47FD082A92F3BB9C130@US70UWXCHMBA05.zam.alcatel-lucent.com> Date: Mon, 29 Apr 2013 09:40:52 -0700 To: "Ejzak, Richard P (Richard)" X-OriginalArrivalTime: 29 Apr 2013 16:40:53.0633 (UTC) FILETIME=[50ABAF10:01CE44F8] Cc: Randell Jesup , "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 16:40:55 -0000 I would also note that the maximum number of streams can be indicated in the= association negotiation. So if there is concern about unexpected data chan= nels and associated data, that mechanism can be used. If the application kno= ws how many streams it will need, might it not be wise to indicate this in a= ssociation setup? On Apr 29, 2013, at 7:12, "Ejzak, Richard P (Richard)" wrote: > After remaining neutral during most of this discussion about the need for O= PEN, I've finally come to the conclusion that Matthew is right. The only th= ing the OPEN provides is the label, which is just an opaque string with no m= eaning to the browser or any intermediaries. It only has application signif= icance. If this is the case, why not just use stream id? What can you poss= ibly do with label that you can't do with pre-assigned stream ids (this is a= serious question to Randell since it is fundamental to whether we need OPEN= )? Since label only has meaning when both browsers run the same application= , what does it matter if you agree on a set of opaque strings to correspond t= o various functions or just agree on a set of stream ids for these functions= ? It doesn't change the complexity of the code and it doesn't even change t= he readability of the code if you just enumerate the reserved stream ids and= "label" them in the code. =20 >=20 > You can even reserve stream ids in odd/even pairs so that either end can i= nitiate them. You can reserve blocks of stream ids if you want multiple ins= tances of the same type of DC. I don't see any significant limitation here.= >=20 > Getting rid of OPEN eliminates any issues around their handling in the uno= rdered case. >=20 > Getting rid of OPEN does not preclude use of new subprotocols as needed an= d does not preclude use of any other signaling to negotiate use of DataChann= els between heterogeneous applications. OPEN does not help in this case any= way. >=20 >=20 >> On 4/25/2013 12:36 PM, Randell Jesup wrote: >> On 4/26/2013 9:53 AM, Matthew Kaufman wrote: >>> On 4/25/2013 2:42 PM, Randell Jesup wrote: >>>> On 4/25/2013 5:10 PM, Cullen Jennings (fluffy) wrote: >>>>> So with my co-chair hat on here... >>>>>=20 >>>>> It seems we have been around the need for OPEN several times and >>>>> have come to consensus on it in the past. Can someone please: >>>>>=20 >>>>> 1) summarize the arguments that in the past that lead us to think >> we >>>>> need OPEN >>>>=20 >>>> The Open message has some important and useful properties: >>>>=20 >>>> 1) It's easier to work with. JS isn't an ideal language for writing >>>> network protocols, especially for non-network-programmers (i.e. a >>>> large portion of the expected developer community). Open makes it >>>> really easy for a developer to get the type of bidirectional stream >>>> them want with little fuss, and in a manner that maps easily to APIs >>>> they're already used to (e.g. WebSockets). In many cases the label >>>> field will avoid the JS programmer having to build their own >>>> mini-protocol to identify their channels (and this is especially >>>> painful for them if it's an unreliable channel). >>>=20 >>> Easier how? The initiating side needs to create their object without >>> the benefit of the contents of an open message. If a JS developer >>> isn't smart enough to set up the channel parameters they want at the >>> initiating end, then there's nothing we can do for them. There's then >>> several ways forward after that, including "the other side does the >>> same thing to create their end" (my preference) and "the parameters >>> are transported using the existing SDP O/A mechanism to the far end" >>> (generally how the WG solves this kind of problem). >>>=20 >>> As far as I can tell, the one useful thing in the OPEN message is the >>> label (as I pointed out in my very first inquiry about why anyone >>> thought it was needed), and yet the label is allowed to be null, so >> in >>> that case how can it be helpful? >>=20 >> It's helpful if you need it (if you're opening a number of channels, >> such as one per participant in a conference). Protocol is also helpful >> (note it's in the dictionary and is also optional); both for cross- >> application channels and for within an app to indicate what handling >> logic the channel should feed. >>=20 >> // pseudo-codey: >> function called_from_ondatachanne(event) { >> channel =3D event.channel; >> if (channel.protocol =3D=3D "file transfer") { channel.onmessage =3D >> handle_incoming_file; } >> else if (channel.protocol =3D=3D "chat") {chat =3D new >> chat_instance(channel.label); channel.onmessage =3D chat.incoming; } } >>=20 >>>=20 >>>>=20 >>>> 2) It makes it possible to have different applications exchange >> data, >>>> by having an IANA-registered protocol name, like WebSockets (and >>>> there was strong agreement on it's being needed for that at >>>> Atlanta.) With external-negotiation-only, it would be very hard for >>>> different apps to interoperate, since they'd need to agree on >>>> negotiation protocols as well, which are likely to be highly >>>> divergent between apps. >>>=20 >>> If we went with "negotiated via the SDP O/A mechanism" then we could >>> go to our favorite SDP-defining WG and have a negotiation protocol >>> that is standardized, so not divergent at all between apps. >>=20 >> We also don't have one that's divergent by using Open (and we leave the >> option of externally negotiating or pre-defining channels). And SDP is >> at least one signaling-RTT to complete, plus a bunch of logic to handle >> matching everything up (what if channels disappear in the offer or >> answer, or in an offer or answer they change properties? What if the >> signaling channel is slow or unavailable any more (server rebooted, >> server has network issues, etc)? >>=20 >> I'm not saying there aren't answers/solutions to all these. But those >> answers and solutions would need to be speced out or at least >> understood, and the code to handle all of them is likely to be similar >> in scope (though quite different in detail). And the less done in SDP, >> the better IMHO; I have no wish to increase our reliance on SDP. >>=20 >>>>=20 >>>> 3) The Open message, being in-channel, reliable and in-order, makes >>>> the issue that was the genesis of this thread (what to do with data >>>> that arrives unexpectedly) simpler. >>>=20 >>> I disagree. It increases the number of possible states... there's >>> cases where the OPEN message arrives but the application doesn't want >>> to be receiving that data, and the cases where the OPEN message >>> doesn't arrive but the application does want the data that is already >>> arriving. Both of those states don't exist if there's no OPEN >> message. >>=20 >> My point was you need to decide what to do with that data regardless of >> if the channel gets created with a delayed OPEN or with a delayed >> external negotiation. And with OPEN, those cases don't even arise for >> ordered channels. >>=20 >>>=20 >>>> With Open, only degenerate cases can cause more than a relatively >>>> small amount of data to be buffered. >>>=20 >>> Sure, but those degenerate cases occur many times per day on the real >>> Internet. >>=20 >> I doubt that. The degenerate cases for Open require that all the open >> packets get lost, while a sizable amount of non-open packets get >> through >> - and after a time, SCTP will fail the entire association if reliable >> data isn't getting through. Plus, as I indicated, we can also have >> limits on time and/or amount of data buffered. >>=20 >> Also: nothing *requires* that an application send data immediately on >> onopen. An application can institute it's own handshake trivially: >> function my_ondatachannel(event) { >> event.channel.send(ok_to_start_sending); ... } >>=20 >>>=20 >>>> With external notification, the external negotiation channel can >> fail >>>> (or be very slow), or the app can have a bug and fail to install the >>>> negotiated values, leading to larger or unbounded buffering >>>> requirements - or you punt the problem to the application by >>>> delivering the data, but the application is facing the same >> conundrum >>>> of buffer it or throw it away. >>>>=20 >>>>> 2) sketch out the range of possible solutions to deal with >>>>> unexpected data before the OPEN >>>>=20 >>>>=20 >>>> The issue exists regardless of whether Open is used or external >>>> negotiation (and in fact is much simpler for Open). >>>>=20 >>>> *tl;dr: *I'm ok with any setting of maximum sizes and/or times that >>>> would not adversely impact temporary buffering for normal cases with >>>> Open of unordered channels. This is option C below. I also would be >>>> ok with B, but I realize others may not be. >>>>=20 >>>> Regardless of supporting Open or not, any external negotiation of >>>> dynamic channels must use one of these: >>>>=20 >>>> A) a 2-or-3-way handshake so the sender knows the receiver is ready >>>> to receive the data on the specified channel before sending it, or >>>>=20 >>>> B) unbounded buffering of data if the external negotiation messages >>>> are delayed (again, what we're discussing in this thread), or >>>>=20 >>>> C) bounded buffering of data (bounded by time, size or both), with >>>> data being dropped and the channel closed if the limits are >> exceeded, or >>>>=20 >>>> D) deliver unexpected data to the application, which will do .... I >>>> don't know what with it. >>>>=20 >>>> For (D), the application will likely drop it on the floor (leading >> to >>>> hard-to-test-for problems if the channel is later configured by Open >>>> or external negotiation), or buffer it waiting for the channel to >> open. >>>>=20 >>>> Supporting Open or not has little bearing on these scenarios >>>=20 >>> So if that's true, then why do we need it? >>=20 >> This was a discussion of "what to do with data that arrives >> unexpectedly >> (i.e. before Open, or before the application installed the result of an >> external negotiation); this was the original point of the thread before >> you decided to question the selection of Open as a message. >>=20 >> The caveat at the top was "external negotiation of dynamic channels >> must >> do one of these" regardless of whether Open is supported. The options >> for use with Open are the same, but the amount of data that can be >> buffered is smaller (since with external negotiation there are no >> limits >> on the amount that could attempt to be queued -- the same applies SDP >> if >> you allow the sender to send data before the negotiation is complete; >> SDP is effectively a form of external negotiation). >>=20 >>>=20 >>>> -- and in fact, since Open is in-channel, reliable, and ordered, it >>>> reduces the problem set (when Open is used) to only unordered >>>> channels (in ordered channels Open will always be first). >>>>=20 >>>> Buffering unexpected data on channels (options B or C) is useful. It >>>> means that in the external negotiation case, one side asking for a >>>> new channel to open by some private means doesn't need to wait to >>>> start sending data on that channel. >>>=20 >>> Of course this is different from the TCP model, where the buffering >>> happens at the *sender* until the handshake is complete. >>=20 >> Ok, but this isn't TCP. And handshakes (and the resultant delay before >> onopen fired) were eliminated in order to respond to the requests of >> multiple people, giving us a 0-RTT declarative protocol where you can >> send immediately, which will help apps that need to exchange data >> quickly at the start of a connection. >>=20 >>> The problem here is that we have an existing mechanism inside of SCTP >>> and then we're adding another layer on top of that which is neither >>> inside SCTP (where it probably belongs) or under the application >>> developer's control (where I'd like to see it, if the data transport >>> protocol can't have it), and this layer conflicts with what both of >>> those might be doing. >>=20 >> If you're referring to Open, you can totally ignore Open and not use it >> in your datachannels, and use all external negotiation or pre-defined >> channels. If you want, you can just pre-define N open channels that >> the >> other side can then use to send data to you, and nothing will ever be >> buffered, and you can handle it all yourself. >>=20 >>>=20 >>>> Note that with external negotiation (possibly on a non p2p path, >> like >>>> via signaling), the receiver might not know what to install for a >>>> short while, especially if there's a routing issue or server issue >>>> (not a problem that happens with Open). >>>=20 >>> Which is fine if the sender doesn't start sending (like TCP). Or if >>> the transport protocol itself handles the delivery of the channel >>> metadata. (Which is what SCTP, or whatever transport we choose for >>> RTCWEB, should do) then you just handle the label and whatever other >>> metadata the receiver would like to know at that layer. >>=20 >> I.e. data streams from RTMFP, I take it? ;-) >>=20 >>>=20 >>>>=20 >>>> Since normal Open cases have very little chance of triggering this >>>> problem (triggering buffering), some arbitrary size limit seems >>>> reasonable (option C). Often in network protocols there are small >>>> buffers (4, 16, 64KB). I prefer a larger value of say 256KB so that >>>> apps using external negotiation can just send largish data >>>> immediately - and note: actually buffering data is still an unlikely >>>> occurrence even in most external negotiation cases. If people want >>>> to bikeshed on the buffersize or timeout, that's fine. ;-) >>>>=20 >>>> Also, external negotiation is the only case where more than a >> trivial >>>> amount of data can "pile up" in the buffer waiting for the receiving >>>> side to finish it's side of the negotiation (i.e. if your external >>>> negotiation channel fails or the app has a brain fart). >>>=20 >>> Another great argument for having this negotiation happen within the >>> transport itself. >>=20 >> If you want to argue for replacing SCTP as the base layer - we made >> that >> decision a good long while ago. And there's a good, maintained, >> BSD-licensed implementation - and the authors of that are working with >> us here in designing a DataChannel protocol to ride on top of it. If >> you want to argue that the layer on top of SCTP should be handshaked >> once again (as it was until people objected) that's up to you to make >> the case for. >>=20 >> IMO: >> I'd like to avoid continuing to circle through the range of all >> possible >> protocols one at a time, repeating every few months. I'll assert we >> can >> bikeshed on this until we all retire, and we'll never have something >> that makes everyone entirely happy (unless most people get tired and >> stop caring). All solutions have tradeoffs; none is perfect for all >> use-cases and users. We arrived at a proposal that had general >> agreement in the room to move forward with per the consensus call, and >> I'm preparing a WG draft in response to that. Some may like it more >> and >> some less, but there was agreement that people could work with it. >>=20 >> -- >> Randell Jesup >> randell-ietf@jesup.org >>=20 >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From martin.thomson@gmail.com Mon Apr 29 11:06:13 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C99AB21F96AC for ; Mon, 29 Apr 2013 11:06:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.548 X-Spam-Level: X-Spam-Status: No, score=-1.548 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, J_CHICKENPOX_53=0.6, MIME_8BIT_HEADER=0.3, NO_RELAYS=-0.001, SARE_SUB_ENC_UTF8=0.152] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9FLloPvsNY-B for ; Mon, 29 Apr 2013 11:06:12 -0700 (PDT) Received: from mail-wg0-x236.google.com (mail-wg0-x236.google.com [IPv6:2a00:1450:400c:c00::236]) by ietfa.amsl.com (Postfix) with ESMTP id 6064721F9AE8 for ; Mon, 29 Apr 2013 11:06:12 -0700 (PDT) Received: by mail-wg0-f54.google.com with SMTP id y10so4028061wgg.9 for ; Mon, 29 Apr 2013 11:06:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type:content-transfer-encoding; bh=KSXvC190tUlstmS5d5s47rbDtSb+j6IpA5+g2wlBCeY=; b=enEWQqJL08L4lZ2/y01uAYAeIzMo6CNG/cjjYmbPMNm9bk3np6oNvgYLF5gkdJa6IV XANLRY0xS6c3AX2kgsMTHwMluJYM5gHDic6OvtUHCH8MVwu/5Qkcfbp7T+r8l4XKP9b7 jdH1kuj9svmff3QZNmx99/YOn8xWlLgowwZvAmzj8rAcXWgMLptL1uJmM6euf8yrU5lH HT25GwRzamsNylU/X6/oJyJ+tdUN6wKGi0JE9OwLA/PF28hG/GMAmZX421kVD9lfOqTX EKX52XIhl3nc2QB83ffilwGcGBJe6iVXqqm//say5cv+ha6KOgHlEEeSyqFiKlj+Iz9v MRsg== MIME-Version: 1.0 X-Received: by 10.180.83.199 with SMTP id s7mr19612023wiy.19.1367258771540; Mon, 29 Apr 2013 11:06:11 -0700 (PDT) Received: by 10.194.33.102 with HTTP; Mon, 29 Apr 2013 11:06:11 -0700 (PDT) In-Reply-To: References: <517E7E7D.1040905@ericsson.com> Date: Mon, 29 Apr 2013 11:06:11 -0700 Message-ID: From: Martin Thomson To: Bernard Aboba Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] =?utf-8?q?WG_last_call_comments_on_use-case_and_requirem?= =?utf-8?b?ZW50IGRvY3VtZW50LCDigJxoaWRlIElQIGFkZHJlc3PigJ0=?= X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 18:06:13 -0000 Here's how I see it. 1. Is where I, as a user of the browser (or, more likely, as administrator for the user of the browser) decide that I don't want host candidates exposed to *anyone*. This means that I would like to be able to request that the browser do the following: a) use the TURN server that I configure b) don't provide base addresses or provide bogus base addresses This is entirely a negotiation that occurs between browser users and browsers. API requirements are zero. That doesn't mean that we're off the hook entirely. We can do a), perhaps, with some DHCP and DNS messing around, but it's not possible to convey b) through those channels. I'm sure that some people will argue that we don't want to try to solve this problem, but given the complete mess that has been made of HTTP proxy discovery (wpad, proxy.pac, ...) and the way that users use browsers, I think that this is something that needs to be done. (I've just thought of some actual feedback on Andy's draft...) 2. is a no-brainer. If I want to use a service that I trust to protect my anonymity, then that's great. Here I agree with Bernard, this is common enough, important enough, and easy enough to solve. Adding a means to request anonymity is a good thing. 3. is a security considerations problem On 29 April 2013 09:14, Bernard Aboba wrote: > For Case 2 there are real customers out there (e.g. Women's shelters, For= ensic psychologists dealing with criminals, etc.) so I would favor includin= g it. > > For case 1, I think we need a bit more detail on the adversary model. Is = this the same as Case 2 (e.g. Hiding from another user, not the web server = or STUN server?) I can imagine scenarios where granular candidate control w= ould be useful. Not sure I would put all those cases in the privacy bucket,= though. > > On Apr 29, 2013, at 7:12, "Stefan H=C3=A5kansson LK" wrote: > >> >> >> This relates to the comments to the WG last call of the use-cases and re= quirements document [1]. >> >> This is a discussion starting from A25 =E2=80=9C It must be possible for= the application to refrain from exposing the IP address=E2=80=9D. >> >> Discussed a lot ([2]-[24]). I think there are several aspects here that = are discussed, and we need to separate them to enable a more fruitful discu= ssion. The browser being configured to not reveal addresses applies to at l= east the following cases: >> >> 1) Private domain with NAT where the internal structure should be hidden= can configure their browsers to not reveal that inner structure by only pr= oviding relay or NAT external candidates, none from the private space. >> >> 2) An user wants to avoid having their actual location revealed to any o= ther user of the same service. >> >> 3) The user wants to be prevent revealing their point of attachment to t= he network even to the web service. >> >> This results in different functional requirements >> >> 1) Requires browser support but also configuration to determine which ca= ndidates are ok and which are not. It may be fine with server reflexive can= didates and not only relay candidates >> >> 2) A browser could help, but is not required for this. The browser may h= ave clearer understanding from where the different candidates were gotten a= nd thus understand if they reflect a privacy issue or not. >> >> 3) Needs additional anonymity service, like TOR and something that preve= nts any actual interface addresses to be revealed to the web-app. >> >> >> I think 3) is out of scope (that is how I interpret the discussion), but= it is not clear to me if we want to meet 1) or 2) or both with this requir= ement. I would like input on this topic. >> >> Stefan >> >> >> [1] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06136.html >> >> [2] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06198.html >> [3] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06219.html >> [4] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06220.html >> [5] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06221.html >> [6] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06222.html >> [7] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06223.html >> [8] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06233.html >> [9] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06234.html >> [10] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06235.html >> [11] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06236.html >> [12] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06238.html >> [13] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06240.html >> [14] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06241.html >> [15] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06245.html >> [16] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06247.html >> [17] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06248.html >> [18] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06253.html >> [19] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06256.html >> [20] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06259.html >> [21] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06260.html >> [22] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06261.html >> [23] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06262.html >> [24] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06180.html >> >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From randell-ietf@jesup.org Mon Apr 29 14:57:07 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EB47021F9BBB for ; Mon, 29 Apr 2013 14:57:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GHwpaUwAPRJ1 for ; Mon, 29 Apr 2013 14:57:01 -0700 (PDT) Received: from r2-chicago.webserversystems.com (r2-chicago.webserversystems.com [173.236.101.58]) by ietfa.amsl.com (Postfix) with ESMTP id E40EB21F9BA8 for ; Mon, 29 Apr 2013 14:57:00 -0700 (PDT) Received: from 173-164-135-225-sfba.hfc.comcastbusiness.net ([173.164.135.225]:57628 helo=[10.1.10.57]) by r2-chicago.webserversystems.com with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.80) (envelope-from ) id 1UWw4B-0004n3-Vx for rtcweb@ietf.org; Mon, 29 Apr 2013 16:57:00 -0500 Message-ID: <517EECAB.3010206@jesup.org> Date: Mon, 29 Apr 2013 14:56:59 -0700 From: Randell Jesup User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Thunderbird/21.0 MIME-Version: 1.0 To: rtcweb@ietf.org References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <5174C8D2.40504@matthew.at> <5177F7EE.1010909@matthew.at> <5179A362.2000309@jesup.org> <517A86CB.5020305@matthew.at> <517ABB06.5070807@jesup.org> <03FBA798AC24E3498B74F47FD082A92F3BB9C130@US70UWXCHMBA05.zam.alcatel-lucent.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - r2-chicago.webserversystems.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - jesup.org Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 21:57:07 -0000 On 4/29/2013 9:40 AM, Bernard Aboba wrote: > I would also note that the maximum number of streams can be indicated in the association negotiation. So if there is concern about unexpected data channels and associated data, that mechanism can be used. If the application knows how many streams it will need, might it not be wise to indicate this in association setup? The number of streams in the SDP is the initial number of streams (with a suggested default of 16). That's entirely an optimization to avoid the application needing to immediately need to renegotiate a larger number, or to have a large number of never-used channels if the default was set way too high. If streams are needed past the number currently allocated, an increase will be requested and the createDataChannel queued. (Note: this applies to pre-negotiated channels using streams past the currently allocated number as well). -- Randell Jesup randell-ietf@jesup.org From worley@shell01.TheWorld.com Mon Apr 29 14:59:53 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3F29E21F9C22 for ; Mon, 29 Apr 2013 14:59:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.38 X-Spam-Level: X-Spam-Status: No, score=-2.38 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, J_CHICKENPOX_14=0.6, RCVD_IN_DNSWL_LOW=-1, RCVD_IN_SORBS_WEB=0.619] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vDlgmxLkp505 for ; Mon, 29 Apr 2013 14:59:48 -0700 (PDT) Received: from TheWorld.com (pcls6.std.com [192.74.137.146]) by ietfa.amsl.com (Postfix) with ESMTP id 7D69E21F9C23 for ; Mon, 29 Apr 2013 14:59:48 -0700 (PDT) Received: from shell.TheWorld.com (root@shell01.theworld.com [192.74.137.71]) by TheWorld.com (8.14.5/8.14.5) with ESMTP id r3TLxgCI017242; Mon, 29 Apr 2013 17:59:44 -0400 Received: from shell01.TheWorld.com (localhost.theworld.com [127.0.0.1]) by shell.TheWorld.com (8.13.6/8.12.8) with ESMTP id r3TLxg1V3758048; Mon, 29 Apr 2013 17:59:42 -0400 (EDT) Received: (from worley@localhost) by shell01.TheWorld.com (8.13.6/8.13.6/Submit) id r3TLxgYw3758081; Mon, 29 Apr 2013 17:59:42 -0400 (EDT) Date: Mon, 29 Apr 2013 17:59:42 -0400 (EDT) Message-Id: <201304292159.r3TLxgYw3758081@shell01.TheWorld.com> From: worley@ariadne.com (Dale R. Worley) Sender: worley@ariadne.com (Dale R. Worley) To: Martin Thomson In-reply-to: (martin.thomson@gmail.com) References: <066.4c5db43349d3176acaa90d17617a02d6@trac.tools.ietf.org> <5173ECC7.7020909@jitsi.org> <51754363.3090300@ericsson.com> <201304222215.r3MMFqsE3199256@shell01.TheWorld.com> <201304231858.r3NIw4OJ3260483@shell01.TheWorld.com> <201304252220.r3PMKUjt3433388@shell01.TheWorld.com> Cc: pthatcher@gmail.com, rtcweb@ietf.org Subject: Re: [rtcweb] #15: Section 4.8: SSRC signaling X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 21:59:53 -0000 > From: Martin Thomson > > > Each SSRC is demultiplexed based on an RTCP SDES item that gives > > the mapping between the SSRC and the m= line via which it is > > presented to the application layer (that is, the constituent m= > > line sequence number). > > It's been proposed. I don't know exactly why it wasn't considered > worth pursuing. > > Maybe you can ask Peter Thatcher to share his document on demux. It's > a reasonable taxonomy of the available options. Better than what I'm > able to write up in a short time. What I can find is draft-pthatcher-mmusic-many-sources-00, but it doesn't seem to describe demultiplexing. That draft does contain a small error: o With BUNDLE, use of RFC5576 a=ssrc attributes is required in order for the recipient to be able to properly demultiplex incoming RTP. Payload type isn't sufficient as a demux point, since RTCP packets don't contain RTP payload types. Therefore, this approach requires both sides to understand RFC5576, just like the single-m- section approach. a=ssrc attributes are not strictly needed, because RTCP packets contain SSRC identifiers, and RTP packets contain both SSRC and PT. So caching the SSRC/PT correspondence seen in the RTP packets allows the RTCP packets to be assigned to the proper m= lines. This matters because a=ssrc attributes are problematic; we want to add, remove, and adjust video flows without additional offer/answer cycles, which precludes adding or changing a=ssrc attributes in the SDP to handle the new flow. (This is requirement 3 in http://www.ietf.org/proceedings/interim/2013/02/05/rtcweb/slides/slides-interim-2013-rtcweb-1-10.pdf, "Add/remove one way video flows with minimal chance of glare on non-legacy apps" and DES F11 in draft-worley-sdp-bundle.) Dale From bernard_aboba@hotmail.com Mon Apr 29 15:23:07 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2199021F9B18 for ; Mon, 29 Apr 2013 15:23:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -101.139 X-Spam-Level: X-Spam-Status: No, score=-101.139 tagged_above=-999 required=5 tests=[AWL=-0.536, BAYES_00=-2.599, J_CHICKENPOX_14=0.6, MIME_QP_LONG_LINE=1.396, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6EB-9WiP3myY for ; Mon, 29 Apr 2013 15:23:01 -0700 (PDT) Received: from blu0-omc4-s7.blu0.hotmail.com (blu0-omc4-s7.blu0.hotmail.com [65.55.111.146]) by ietfa.amsl.com (Postfix) with ESMTP id 3216121F9B16 for ; Mon, 29 Apr 2013 15:23:01 -0700 (PDT) Received: from BLU405-EAS385 ([65.55.111.136]) by blu0-omc4-s7.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Mon, 29 Apr 2013 15:23:00 -0700 X-EIP: [iW3XRf+iba1byKaWUKbXSv4FCJMSd944] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable References: <066.4c5db43349d3176acaa90d17617a02d6@trac.tools.ietf.org> <5173ECC7.7020909@jitsi.org> <51754363.3090300@ericsson.com> <201304222215.r3MMFqsE3199256@shell01.TheWorld.com> <201304231858.r3NIw4OJ3260483@shell01.TheWorld.com> <201304252220.r3PMKUjt3433388@shell01.TheWorld.com> <201304292159.r3TLxgYw3758081@shell01.TheWorld.com> From: Bernard Aboba MIME-Version: 1.0 (1.0) In-Reply-To: <201304292159.r3TLxgYw3758081@shell01.TheWorld.com> Date: Mon, 29 Apr 2013 15:22:57 -0700 To: "Dale R. Worley" X-OriginalArrivalTime: 29 Apr 2013 22:23:00.0890 (UTC) FILETIME=[1BDE87A0:01CE4528] Cc: "rtcweb@ietf.org" , "pthatcher@gmail.com" Subject: Re: [rtcweb] #15: Section 4.8: SSRC signaling X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 22:23:07 -0000 On Apr 29, 2013, at 2:59 PM, "Dale R. Worley" wrote: >> From: Martin Thomson >>=20 >>> Each SSRC is demultiplexed based on an RTCP SDES item that gives >>> the mapping between the SSRC and the m=3D line via which it is >>> presented to the application layer (that is, the constituent m=3D >>> line sequence number). >=20 > a=3Dssrc attributes are not strictly needed, because RTCP packets > contain SSRC identifiers, and RTP packets contain both SSRC and PT. > So caching the SSRC/PT correspondence seen in the RTP packets allows > the RTCP packets to be assigned to the proper m=3D lines. >=20 > This matters because a=3Dssrc attributes are problematic; we want to > add, remove, and adjust video flows without additional offer/answer > cycles, which precludes adding or changing a=3Dssrc attributes in the > SDP to handle the new flow. =20 [BA] The PT/SSRC mapping only works if each PT maps to only one m=3D line (a= nd you don't run out of PTs). Also, without a parameter in an SDES report yo= u might get a receiver report from an SSRC without corresponding RTP packets= to allow mapping the SSRC to an m=3D line.= From bernard_aboba@hotmail.com Mon Apr 29 15:29:45 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 00E6B21F9A81 for ; Mon, 29 Apr 2013 15:29:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -101.26 X-Spam-Level: X-Spam-Status: No, score=-101.26 tagged_above=-999 required=5 tests=[AWL=-0.057, BAYES_00=-2.599, MIME_QP_LONG_LINE=1.396, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7GOLa7Gn1tNF for ; Mon, 29 Apr 2013 15:29:40 -0700 (PDT) Received: from blu0-omc3-s14.blu0.hotmail.com (blu0-omc3-s14.blu0.hotmail.com [65.55.116.89]) by ietfa.amsl.com (Postfix) with ESMTP id 4842A21F9A7E for ; Mon, 29 Apr 2013 15:29:40 -0700 (PDT) Received: from BLU404-EAS197 ([65.55.116.72]) by blu0-omc3-s14.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Mon, 29 Apr 2013 15:29:40 -0700 X-EIP: [TYZ9hDFfKV5bW3RN82p+iAC3aITmHtnM] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <5174C8D2.40504@matthew.at> <5177F7EE.1010909@matthew.at> <5179A362.2000309@jesup.org> <517A86CB.5020305@matthew.at> <517ABB06.5070807@jesup.org> <03FBA798AC24E3498B74F47FD082A92F3BB9C130@US70UWXCHMBA05.zam.alcatel-lucent.com> <517EECAB.3010206@jesup.org> From: Bernard Aboba MIME-Version: 1.0 (1.0) In-Reply-To: <517EECAB.3010206@jesup.org> Date: Mon, 29 Apr 2013 15:29:36 -0700 To: Randell Jesup X-OriginalArrivalTime: 29 Apr 2013 22:29:40.0059 (UTC) FILETIME=[09CAE2B0:01CE4529] Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 22:29:45 -0000 Right. What I was trying to say is that an application has control over how m= any data channels it can need to handle.=20 On Apr 29, 2013, at 2:57 PM, "Randell Jesup" wrote:= > On 4/29/2013 9:40 AM, Bernard Aboba wrote: >> I would also note that the maximum number of streams can be indicated in t= he association negotiation. So if there is concern about unexpected data ch= annels and associated data, that mechanism can be used. If the application k= nows how many streams it will need, might it not be wise to indicate this in= association setup? >=20 > The number of streams in the SDP is the initial number of streams (with a s= uggested default of 16). That's entirely an optimization to avoid the appli= cation needing to immediately need to renegotiate a larger number, or to hav= e a large number of never-used channels if the default was set way too high.= >=20 > If streams are needed past the number currently allocated, an increase wil= l be requested and the createDataChannel queued. (Note: this applies to pre= -negotiated channels using streams past the currently allocated number as we= ll). >=20 > --=20 > Randell Jesup > randell-ietf@jesup.org >=20 > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From martin.thomson@gmail.com Mon Apr 29 15:58:25 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4414C21F9B79 for ; Mon, 29 Apr 2013 15:58:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jJOXdPwpcjTz for ; Mon, 29 Apr 2013 15:58:24 -0700 (PDT) Received: from mail-wi0-x234.google.com (mail-wi0-x234.google.com [IPv6:2a00:1450:400c:c05::234]) by ietfa.amsl.com (Postfix) with ESMTP id 8665621F9B78 for ; Mon, 29 Apr 2013 15:58:24 -0700 (PDT) Received: by mail-wi0-f180.google.com with SMTP id h11so3349892wiv.7 for ; Mon, 29 Apr 2013 15:58:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=XUzKsXPvvx1bscZFTHdiAzdpStsNSgO0AH5ljiXqOm8=; b=Yeyu/f+WzREnb0Z3WfTN+cZfkSSG+9v/lVNcOR2yOJivcSMRkUers6lh/NpBfufRnj SdQKE84s64i/PKQ4Kcf06A+58nAi4dP44JWhiMTfuHee32NRlZlUvtypGrBl6Nc/Nlfp 1sNrSS113ClVhlbg5pXZ+j9DVm7zBML2CKjsPw1/0IGrEv1ansAPljBKJqDyiWTYo41K IihC+67hI+8WVE/sVDTbwaul2xGznZdtWLBqRsDdfcsuMGPnX1nZX/AxYiYtgXMuWcya XQVxO0zYLsk5Aq0HPYcsUUbPx8PkJmu6Upw6vKjTIFlXyROBHOUBOk91Qwo+N52pm6ze rdAQ== MIME-Version: 1.0 X-Received: by 10.180.189.41 with SMTP id gf9mr10876696wic.32.1367276303716; Mon, 29 Apr 2013 15:58:23 -0700 (PDT) Received: by 10.194.33.102 with HTTP; Mon, 29 Apr 2013 15:58:23 -0700 (PDT) In-Reply-To: <517EECAB.3010206@jesup.org> References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <5174C8D2.40504@matthew.at> <5177F7EE.1010909@matthew.at> <5179A362.2000309@jesup.org> <517A86CB.5020305@matthew.at> <517ABB06.5070807@jesup.org> <03FBA798AC24E3498B74F47FD082A92F3BB9C130@US70UWXCHMBA05.zam.alcatel-lucent.com> <517EECAB.3010206@jesup.org> Date: Mon, 29 Apr 2013 15:58:23 -0700 Message-ID: From: Martin Thomson To: Randell Jesup Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 22:58:25 -0000 On 29 April 2013 14:56, Randell Jesup wrote: > The number of streams in the SDP is the initial number of streams (with a > suggested default of 16). That's entirely an optimization to avoid the > application needing to immediately need to renegotiate a larger number, or > to have a large number of never-used channels if the default was set way too > high. > > If streams are needed past the number currently allocated, an increase will > be requested and the createDataChannel queued. (Note: this applies to > pre-negotiated channels using streams past the currently allocated number as > well). Actually, I'm not sure where this has been discussed, but there is an assumption of SDP use that doesn't fit my model for SDP. That is, when I use SDP, I describe what I can do, i.e., my limits. That establishes an operating envelope within which I can change behavior. When I negotiate 16 streams, I had assumed that this would be a limit and that I might negotiate fewer than that initially and be open to attempts to open more. That is, up to but not exceeding 16. If this is something that doesn't make sense to negotiate in SDP, then let's not do that. As another issue, have we ever discussed the SCTP profile that we are expected to implement? Are we expected to have and use every SCTP feature ever defined or just a specific subset? Where is the right place to capture that? Does this have ramifications for SDP, or shall we let the SCTP extension mechanisms handle the feature negotiation? From randell-ietf@jesup.org Mon Apr 29 16:34:10 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 284F621F9BCD for ; Mon, 29 Apr 2013 16:34:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id H0EPaE1rqzCx for ; Mon, 29 Apr 2013 16:34:04 -0700 (PDT) Received: from r2-chicago.webserversystems.com (r2-chicago.webserversystems.com [173.236.101.58]) by ietfa.amsl.com (Postfix) with ESMTP id 2DC3A21F9BBC for ; Mon, 29 Apr 2013 16:34:03 -0700 (PDT) Received: from 173-164-135-225-sfba.hfc.comcastbusiness.net ([173.164.135.225]:50471 helo=[10.1.10.57]) by r2-chicago.webserversystems.com with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.80) (envelope-from ) id 1UWxa7-000F0K-36 for rtcweb@ietf.org; Mon, 29 Apr 2013 18:34:03 -0500 Message-ID: <517F0369.1050304@jesup.org> Date: Mon, 29 Apr 2013 16:34:01 -0700 From: Randell Jesup User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Thunderbird/21.0 MIME-Version: 1.0 To: rtcweb@ietf.org References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <5174C8D2.40504@matthew.at> <5177F7EE.1010909@matthew.at> <5179A362.2000309@jesup.org> <517A86CB.5020305@matthew.at> <517ABB06.5070807@jesup.org> <03FBA798AC24E3498B74F47FD082A92F3BB9C130@US70UWXCHMBA05.zam.alcatel-lucent.com> In-Reply-To: <03FBA798AC24E3498B74F47FD082A92F3BB9C130@US70UWXCHMBA05.zam.alcatel-lucent.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - r2-chicago.webserversystems.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - jesup.org Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Apr 2013 23:34:10 -0000 On 4/29/2013 7:11 AM, Ejzak, Richard P (Richard) wrote: > After remaining neutral during most of this discussion about the need f= or OPEN, I've finally come to the conclusion that Matthew is right. The = only thing the OPEN provides is the label, which is just an opaque string= with no meaning to the browser or any intermediaries. It only has appli= cation significance. If this is the case, why not just use stream id? W= hat can you possibly do with label that you can't do with pre-assigned st= ream ids (this is a serious question to Randell since it is fundamental t= o whether we need OPEN)? Since label only has meaning when both browsers= run the same application, what does it matter if you agree on a set of o= paque strings to correspond to various functions or just agree on a set o= f stream ids for these functions? It doesn't change the complexity of th= e code and it doesn't even change the readability of the code if you just= enumerate the reserved stream ids and "label" them in the code. ok, multi-point response: Please review the proposed JS API & dictionary posted here and the W3=20 list a while ago (4 weeks?) 1) Label isn't the only data transmitted in the Open message. Protocol=20 (which is particularly important to inter-operating apps, though can=20 still be useful for homogenous apps), and also having the channel=20 parameters be symmetric. Channels don't have to be symmetric, but if=20 they aren't then the receiver of the initial data would need to know by=20 some external method what the reverse channel parameters should be, and=20 then do operations to set it to the appropriate transfer mode. 2) labels can specify some easy tags for the channel. For example, in a = "Hangout", if the server opens up a private chat channel on behalf of=20 another participant, it might do "pc.createDataChannel("Tom", {=20 protocol: "application/funkychat"});". The server might also open one = with a label "Sarah", etc. I also envisioned (in this mailing list) an=20 FTP-like file transfer setup where the label is the filename being=20 transferred. (Think dragging a directory of files onto your chat=20 session to transfer to the other person.) That said, you can always push anything signaled in Open into an initial = message in an ordered reliable channel. When it's NOT ordered and=20 reliable, then it gets more complex for the application to get initial=20 setup done for simple uses (retries to handle packet loss,=20 in-application acks, out-of-order delivery, etc, just to set up the=20 channel, or run a separate reliable negotiation channel (more likely),=20 which would need to be at least 1RTT to avoid races with trying to use=20 the unreliable channel before it's set up, etc. Yes, applications can=20 deal with all this, but some applications will want a simple JS API and=20 simple setup. And it will be tough to get right in a 0-RTT use for=20 non-reliable channels. 3) I proposed something similar to your proposal a year ago, and=20 discussion and comments from people expecting to use this convinced me=20 to adapt the protocol proposal to include label (in particular comments=20 from Justin Uberti, but there were others). Perhaps some of them can=20 chime in, as I can only do so well at describing how they intend or hope = to use label. The other major piece, protocol, was added at the strong=20 request from the people in the room at IETF Atlanta. Matthew's proposal is effectively little different than Martin's=20 proposal from IETF Orlando (or Matthew's assumed proposal, as his=20 comments aren't exactly an alternative proposal and some of the comments = imply a different model with an RTMFP-like initial packet (i.e.=20 Open....). Per the minutes and earlier comments here, the agreement was = to adopt the Open draft, and not proceed with either of the two=20 alternatives given. I'll leave how to resolve this issue to the chairs, = and until told otherwise will continue to work on turning the personal=20 draft into a WG document. (And re-iterate my comments from before - I=20 think we have a solution here that everyone can work with, even if it's=20 not everyone's first choice.) --=20 Randell Jesup randell-ietf@jesup.org From dwing@cisco.com Mon Apr 29 22:12:55 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7A3EF21F9A01 for ; Mon, 29 Apr 2013 22:12:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -109.699 X-Spam-Level: X-Spam-Status: No, score=-109.699 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, J_CHICKENPOX_43=0.6, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id D4UkA2p9wz-N for ; Mon, 29 Apr 2013 22:12:51 -0700 (PDT) Received: from mtv-iport-4.cisco.com (mtv-iport-4.cisco.com [173.36.130.15]) by ietfa.amsl.com (Postfix) with ESMTP id 9063821F99FD for ; Mon, 29 Apr 2013 22:12:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2252; q=dns/txt; s=iport; t=1367298770; x=1368508370; h=mime-version:subject:from:in-reply-to:date:cc: content-transfer-encoding:message-id:references:to; bh=qdfXDYm3fRvjKBLsOWxDwPAtK4jRuZfc3I05v7+LM3o=; b=PEM4kchygzuUaLUTT2jYHbPZRHeaGPJGG0Apol7F9Kx/mNuoRZFbkEYq czEnL97dVDHUN3GIRIaH14ugz0oXTXAnzN4d99LQ1Bm0RwVM0xXDH/joU uzj6M3Qr6mvdjIbkbJfLbDk4hsFzC1eOamOhxogqDWXZlyBDXnl8Ko6Tn o=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AhQFAElSf1GrRDoI/2dsb2JhbABSgwc2Ab5WgQgWdIIfAQEBAwEBAQFrCwULC0YnMAYKCRuHdQUNvwkEjmczB2SCCmEDiRKODIYTixeDBC0c X-IronPort-AV: E=Sophos;i="4.87,579,1363132800"; d="scan'208";a="79910203" Received: from mtv-core-3.cisco.com ([171.68.58.8]) by mtv-iport-4.cisco.com with ESMTP; 30 Apr 2013 05:12:49 +0000 Received: from [10.32.240.196] ([10.32.240.196]) by mtv-core-3.cisco.com (8.14.5/8.14.5) with ESMTP id r3U5Cllq028057; Tue, 30 Apr 2013 05:12:47 GMT Content-Type: text/plain; charset=iso-8859-1 Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) From: Dan Wing In-Reply-To: Date: Mon, 29 Apr 2013 22:12:47 -0700 Content-Transfer-Encoding: quoted-printable Message-Id: <5F38A528-70D7-414D-8462-BE3591EA26C1@cisco.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <517E0322.2060303@oracle.com> <53B9C161-C492-4F07-A9BD-75E17AE79AC9@phonefromhere.com> To: =?iso-8859-1?Q?I=F1aki_Baz_Castillo?= X-Mailer: Apple Mail (2.1503) Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Apr 2013 05:12:55 -0000 On Apr 29, 2013, at 4:49 AM, I=F1aki Baz Castillo wrote: > 2013/4/29 Tim Panton : >> I've seen this asserted more than once, but I'd love to see a = _current_ example where >> you really have an existing network of SRTP/ICE/BUNDLE/RTCP-MUX = capable >> legacy endpoints that you want to connect to webRTC without a = media-level SBC or >> call recording. >>=20 >> My fear is that people are just basing anti-DTLS opinions on the = perceived difficulty of >> building such a network in the future. >>=20 >> I'm ok with legacy interop as a secondary goal of this WG , but = putative-future-legacy interop >> is going too far IMHO, especially since it further complicates the = already tricky problem of >> defining interoperable SDP. >>=20 >> If it is a choice between adding complexity in a legacy gateway or = every browser >> I'd rather add it in the gateway. >=20 >=20 > Hi Tim, let's please separate DTLS and DTLS+EKT: >=20 >=20 > - DTLS-SRTP: I agree with you. It seems that people consider it a > barrier for legacy interop (while it seems not so hard as implementing > ICE, bundle, rtcp-mix....). Anyhow a media gateway would do the job, > exactly as when using SDES-SRTP. >=20 > - DTLS-EKT-SRTP: This requires a gateway sending like "re-INVITE" for > common operations as multimedia session transfer, which involves the > gateway becoming both a media gateway and a complex signaling B2BUA > (and we hate that, right?). That re-INVITE is necessary because Security Descriptions changed the = SRTP key, and Security Descriptions needs to send that re-INVITE. It is = not the fault of DTLS-SRTP-EKT, because it doesn't send a re-INVITE when = the SRTP key changes (EKT handles key changes). =20 If the objection is the re-INVITE when SRTP keys change, the solution is = eliminating Security Descriptions. -d >=20 >=20 >=20 > So please let's separate DTLS and DTLS+EKT since they are really > different options. >=20 >=20 > Best regards. >=20 >=20 > -- > I=F1aki Baz Castillo > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From salvatore.loreto@ericsson.com Mon Apr 29 23:32:59 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 054A921F9A7F for ; Mon, 29 Apr 2013 23:32:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.248 X-Spam-Level: X-Spam-Status: No, score=-106.248 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_SE=0.35, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jplMj5ycjiA0 for ; Mon, 29 Apr 2013 23:32:52 -0700 (PDT) Received: from mailgw7.ericsson.se (mailgw7.ericsson.se [193.180.251.48]) by ietfa.amsl.com (Postfix) with ESMTP id DA4E621F9A93 for ; Mon, 29 Apr 2013 23:32:48 -0700 (PDT) X-AuditID: c1b4fb30-b7f266d000000cb5-c2-517f658f8bd3 Received: from esessmw0247.eemea.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw7.ericsson.se (Symantec Mail Security) with SMTP id 70.B5.03253.F856F715; Tue, 30 Apr 2013 08:32:47 +0200 (CEST) Received: from mail.lmf.ericsson.se (153.88.115.8) by esessmw0247.eemea.ericsson.se (153.88.115.94) with Microsoft SMTP Server id 8.3.279.1; Tue, 30 Apr 2013 08:32:47 +0200 Received: from nomadiclab.lmf.ericsson.se (nomadiclab.lmf.ericsson.se [131.160.33.3]) by mail.lmf.ericsson.se (Postfix) with ESMTP id B4F7F2368; Tue, 30 Apr 2013 09:32:46 +0300 (EEST) Received: from nomadiclab.lmf.ericsson.se (localhost [127.0.0.1]) by nomadiclab.lmf.ericsson.se (Postfix) with ESMTP id 4978E543D7; Tue, 30 Apr 2013 09:32:46 +0300 (EEST) Received: from n94.nomadiclab.com (localhost [127.0.0.1]) by nomadiclab.lmf.ericsson.se (Postfix) with ESMTP id EC86953CA8; Tue, 30 Apr 2013 09:32:45 +0300 (EEST) Message-ID: <517F658E.8010204@ericsson.com> Date: Tue, 30 Apr 2013 09:32:46 +0300 From: Salvatore Loreto User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: "Ejzak, Richard P (Richard)" References: <03FBA798AC24E3498B74F47FD082A92F3BB9C0F6@US70UWXCHMBA05.zam.alcatel-lucent.com> In-Reply-To: <03FBA798AC24E3498B74F47FD082A92F3BB9C0F6@US70UWXCHMBA05.zam.alcatel-lucent.com> Content-Type: multipart/alternative; boundary="------------020307040703080507040505" X-Virus-Scanned: ClamAV using ClamSMTP X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrBLMWRmVeSWpSXmKPExsUyM+JvrW5/an2gwfF14hb7l1xmtuhtCLdY +6+d3YHZo/XZXlaPxz1n2DyWLPnJFMAcxWWTkpqTWZZapG+XwJVx4ugc1oLHixkrtr93a2Bc VdrFyMkhIWAi8frvbHYIW0ziwr31bF2MXBxCAqcYJfY1vmOCcDYwSvxee54ZwtnNKLH5eitU Zh2jxM+/K6CcZYwSjy9sYwIZxiugLTHn6xWwwSwCqhKr900Cs9kEzCSeP9wCNIqDQ1QgWeL/ Dm+IckGJkzOfsIDYIgLOEgcmzAEbwywQKjFl22w2EFtYwFXiYcd6dohdvYwSG3sngs3hFIiV uDipHKI+TGLqk1PMEP+oSVw9twnMFhLQkug928k0gVFkFpJ1s5C0QNgWEovfHGSHsOUlmrfO hoprSCy4s48RWXwBI9sqRvbcxMyc9HLzTYzA2Dm45bfBDsZN98UOMUpzsCiJ886QqgwUEkhP LEnNTk0tSC2KLyrNSS0+xMjEwSnVwDhjuR/76xdzs/lshPRN+fjE+HokjW6JTlzEFj2z8W6s SlVl+aIGbuYknebWqjVmSZKhn7N0TupMmeTmy3xnVceb2TuenLsZdsjp0Lveu/udvAVP2+cd D2fMjpj1rdxfN2bB9LZZItuPlO+fxOR0aO+JjNmFHBMbfDO57O/Pr99s43LXoCfAWYmlOCPR UIu5qDgRAAywymJrAgAA Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Apr 2013 06:32:59 -0000 --------------020307040703080507040505 Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit Hi Richard I think that we have two aspects here that we have to consider and see what the working group opinion is about them: the first is related to the use cases you are describing below in your mail.. the second is related to what means or should mean "to have an SDES option for DataChannel" here I am considering only the latter trying to understand if as you know the DataChannels run directly on top of the DTLS stack, so it is the DTLS sessios as such that provides security, confidentiality etc etc.. SRTP relies on an external key management protocol to set up the key necessary to perform the job, and SDES is just a possible exchange method. so when you propose "to have an SDES option for DataChannel" are you proposing that when/if we will eventually use SDES we have to assure that the key exchanged is the same key used by the DTLS session, on top of which runs Datachannel? or is something different ? if this is the case can you explain it? br /Sal On 4/29/13 4:40 PM, Ejzak, Richard P (Richard) wrote: > > I responded to this question earlier so didn’t want to repeat myself, > but see now that it was either missed or otherwise not accepted. > > Quoting my earlier email from 4/25: > > “Legacy devices support more than just audio and video media. We will > need to occasionally transport protocols like T.140, MSRP, BFCP, > and/or RTSP in some cases, and the primary options are to transport > them over DataChannels or WebSockets. A network server will be needed > to do transport level interworking, of course. It would be useful in > these cases to have an SDES option for DataChannels. Not essential, > but useful. End-to-end security is not even an issue in this case due > to the need for transport level interworking.†> > After further consideration, I don’t currently see a use case for > RTSP, but I still do for the others. If we have a legacy endpoint > doing T.140 and audio, for example, it would be useful to be able to > multiplex the audio together with T.140/DC at the browser, and to put > a box in the network to adapt them as necessary for the legacy > endpoint (decode, demux, DC-to-RTP i/w for T.140, possibly > transcoding). SDES for DC just makes this easier to do. > > *From:*rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] *On > Behalf Of *Bernard Aboba > *Sent:* Saturday, April 27, 2013 10:53 AM > *To:* Salvatore Loreto > *Cc:* rtcweb@ietf.org > *Subject:* Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > I don't understand it either. > > Salvatore Loreto > wrote: > > > I am also puzzled about the request for SDES also in DataChannel. > > /Salvatore > > On 4/26/13 2:35 PM, Iñaki Baz Castillo wrote: > > SDES is obviously requested for legacy interop at RTP layer. Why > do we need SDES in DataChannel if this is a complete new technology? > > -- > Iñaki Baz Castillo > > > > El 25/04/2013 23:55, "Ejzak, Richard P (Richard)" > > escribió: > > I also agree that we should support SDES in addition to DTLS-SRTP. > > This raises a further question about SCTP/DTLS for DataChannels. > It seems that if we support SDES-SRTP, don't we also need to > provide an SDES keying mechanism for DataChannels? Ekr: What is > needed to realize this? > > Richard Ejzak > > > -----Original Message----- > > From: rtcweb-bounces@ietf.org > [mailto:rtcweb-bounces@ietf.org ] On > > Behalf Of Matthew Kaufman (SKYPE) > > Sent: Thursday, April 25, 2013 3:28 PM > > To: Bogineni, Kalyani; 'Cullen Jennings'; rtcweb@ietf.org > > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and > RTCWeb > > > > I agree. The ability to set the cipher suite and keys from > JavaScript > > is critical for certain applications. SDES is the best we'll get > with > > SDP as the API. DTLS-SRTP-only would be unacceptably limiting. > > > > Matthew Kaufman > > > > > -----Original Message----- > > > From: rtcweb-bounces@ietf.org > [mailto:rtcweb-bounces@ietf.org ] On > > > Behalf Of Bogineni, Kalyani > > > Sent: Thursday, April 25, 2013 1:21 PM > > > To: 'Cullen Jennings'; rtcweb@ietf.org > > > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and > RTCWeb > > > > > > We would like to support the use of SDES as a keying method for > > WebRTC. > > > > > > Kalyani Bogineni > > > Verizon > > > > > > -----Original Message----- > > > From: rtcweb-bounces@ietf.org > [mailto:rtcweb-bounces@ietf.org ] On > > > Behalf Of Cullen Jennings > > > Sent: Thursday, April 25, 2013 11:57 AM > > > To: rtcweb@ietf.org > > > Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb > > > > > > > > > The working groups committed some time ago to have a further > > > discussion on whether SDP Security Descriptions (RFC 4568 aka > SDES) > > > would be usable as a keying method for WebRTC. As we prepare for > > that > > > discussion, we'd like to have expressions of interest or > support for > > > that approach which indicate the general outlines of support > > proposed. > > > If you wish to make such an expression of support, please send > it to > > the chairs or the list. > > > > > > Cullen, Magnus, & Ted > > > > > > > --------------020307040703080507040505 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: 8bit
Hi Richard

I think that we have two aspects here that we have to consider and see what the working group opinion is about them:
the first is related to the use cases you are describing below in your mail..
the second is related to what means or should mean "to have an SDES option for DataChannel"

here I am considering only the latter trying to understand if

as you know the DataChannels run directly on top of the DTLS stack, so it is the DTLS sessios as such
that provides security, confidentiality etc etc..
SRTP relies on an external key management protocol to set up the key necessary to perform the job,
and SDES is just a possible exchange method.

so when you propose "to have an SDES option for DataChannel"
are you proposing that when/if we will eventually use SDES we have to assure that the key exchanged
is the same key used by the DTLS session, on top of which runs Datachannel?
or is something different ? if this is the case can you explain it?

br

/Sal



On 4/29/13 4:40 PM, Ejzak, Richard P (Richard) wrote:

I responded to this question earlier so didn’t want to repeat myself, but see now that it was either missed or otherwise not accepted.

 

Quoting my earlier email from 4/25:

 

“Legacy devices support more than just audio and video media.  We will need to occasionally transport protocols like T.140, MSRP, BFCP, and/or RTSP in some cases, and the primary options are to transport them over DataChannels or WebSockets.  A network server will be needed to do transport level interworking, of course.  It would be useful in these cases to have an SDES option for DataChannels.  Not essential, but useful.  End-to-end security is not even an issue in this case due to the need for transport level interworking.â€

 

After further consideration, I don’t currently see a use case for RTSP, but I still do for the others.  If we have a legacy endpoint doing T.140 and audio, for example, it would be useful to be able to multiplex the audio together with T.140/DC at the browser, and to put a box in the network to adapt them as necessary for the legacy endpoint (decode, demux, DC-to-RTP i/w for T.140, possibly transcoding).  SDES for DC just makes this easier to do.

 

From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of Bernard Aboba
Sent: Saturday, April 27, 2013 10:53 AM
To: Salvatore Loreto
Cc: rtcweb@ietf.org
Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb

 

I don't understand it either.

Salvatore Loreto <salvatore.loreto@ericsson.com> wrote:


I am also puzzled about the request for SDES also in DataChannel.

/Salvatore

On 4/26/13 2:35 PM, Iñaki Baz Castillo wrote:

SDES is obviously requested for legacy interop at RTP layer. Why do we need SDES in DataChannel if this is a complete new technology?

--
Iñaki Baz Castillo
<ibc@aliax.net>

El 25/04/2013 23:55, "Ejzak, Richard P (Richard)" <richard.ejzak@alcatel-lucent.com> escribió:

I also agree that we should support SDES in addition to DTLS-SRTP.

This raises a further question about SCTP/DTLS for DataChannels.  It seems that if we support SDES-SRTP, don't we also need to provide an SDES keying mechanism for DataChannels?  Ekr: What is needed to realize this?

Richard Ejzak

> -----Original Message-----
> From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On
> Behalf Of Matthew Kaufman (SKYPE)
> Sent: Thursday, April 25, 2013 3:28 PM
> To: Bogineni, Kalyani; 'Cullen Jennings'; rtcweb@ietf.org
> Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb
>
> I agree. The ability to set the cipher suite and keys from JavaScript
> is critical for certain applications. SDES is the best we'll get with
> SDP as the API. DTLS-SRTP-only would be unacceptably limiting.
>
> Matthew Kaufman
>
> > -----Original Message-----
> > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On
> > Behalf Of Bogineni, Kalyani
> > Sent: Thursday, April 25, 2013 1:21 PM
> > To: 'Cullen Jennings'; rtcweb@ietf.org
> > Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb
> >
> > We would like to support the use of SDES as a keying method for
> WebRTC.
> >
> > Kalyani Bogineni
> > Verizon
> >
> > -----Original Message-----
> > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On
> > Behalf Of Cullen Jennings
> > Sent: Thursday, April 25, 2013 11:57 AM
> > To: rtcweb@ietf.org
> > Subject: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb
> >
> >
> > The working groups committed some time ago to have a further
> > discussion on whether SDP Security Descriptions (RFC 4568 aka SDES)
> > would be usable as a keying method for WebRTC.  As we prepare for
> that
> > discussion, we'd like to have expressions of interest or support for
> > that approach which indicate the general outlines of support
> proposed.
> > If you wish to make such an expression of support, please send it to
> the chairs or the list.
> >
> > Cullen, Magnus, & Ted <The Chairs>
> >
> >


--------------020307040703080507040505-- From gunnar.hellstrom@omnitor.se Tue Apr 30 02:58:37 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B3C6F21F9A4D for ; Tue, 30 Apr 2013 02:58:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.449 X-Spam-Level: X-Spam-Status: No, score=-2.449 tagged_above=-999 required=5 tests=[AWL=-0.149, BAYES_00=-2.599, MIME_8BIT_HEADER=0.3] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uc3AwZQtzati for ; Tue, 30 Apr 2013 02:58:32 -0700 (PDT) Received: from vsp-authed-03-02.binero.net (vsp-authed02.binero.net [195.74.38.226]) by ietfa.amsl.com (Postfix) with SMTP id 38FA421F9B38 for ; Tue, 30 Apr 2013 02:58:31 -0700 (PDT) Received: from smtp01.binero.se (unknown [195.74.38.28]) by vsp-authed-03-02.binero.net (Halon Mail Gateway) with ESMTP for ; Tue, 30 Apr 2013 11:58:23 +0200 (CEST) Received: from [192.168.50.38] (h79n2fls31o933.telia.com [212.181.137.79]) (Authenticated sender: gunnar.hellstrom@omnitor.se) by smtp-09-01.atm.binero.net (Postfix) with ESMTPA id C54513A032 for ; Tue, 30 Apr 2013 11:58:23 +0200 (CEST) Message-ID: <517F95C3.90101@omnitor.se> Date: Tue, 30 Apr 2013 11:58:27 +0200 From: Gunnar Hellstrom User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <517E7D25.2030706@ericsson.com> In-Reply-To: <517E7D25.2030706@ericsson.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Subject: Re: [rtcweb] =?windows-1252?q?WG_last_call_comments_on_use-case_and_r?= =?windows-1252?q?equirement_document=2C_=93Emergency_Services=94?= X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Apr 2013 09:58:37 -0000 I see a need to create a whole new strand of documents standardizing "application of RTCWEB". It would contain items that are not directly linked to details of the media streams standardized in rtcweb, but are important in apparent applications of the technology. It would contribute to the ambition to not create silos. Emergency service access is mainly one such application area. RFC 6881 says: ---------------------------------------------------------------------- SP-1: If a device or application expects to be able to place a call for help, the service provider that supports it MUST facilitate emergency calling. Some jurisdictions have regulations governing this. ED-2: Devices that create media sessions and exchange real-time audio, video, and/or text and that have the capability to establish sessions to a wide variety of addresses and communicate over private IP networks or the Internet SHOULD support emergency calls. Some jurisdictions have regulations governing this. ----------------------------------------------------------------------- These requirements will clearly apply to some rtcweb applications, and it will be important to both remind rtcweb implementers about them and to develop common approaches to how to meet the requirements. One aspect that touches the recent discussion on SRTP usage in RTCWEB is that the specifications from the emergency service organisations EENA and NENA prefer DTLS-SRTP but accept SDES. In summary: Emergency service requirements surely needs to be described in rtcweb related specifications. If it is not mentioned among the kernel use-cases it should be in specifications about application of rtcweb. Gunnar On 2013-04-29 16:01, Stefan Håkansson LK wrote: > > > This relates to the comments to the WG last call of the use-cases and > requirements document [1]. > > The topic in this mail is Emergency Services. This was discussed in > [2] - [16] (i hope I found all the relevant mails, please correct me > if I missed any), and my conclusion is that we should not add specific > use-cases or requirements for Emergency Services. > > Stefan > > > [1] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06136.html > > [2] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06160.html > > [3] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06226.html > [4] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06227.html > [5] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06229.html > [6] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06231.html > [7] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06232.html > [8] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06239.html > [9] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06230.html > [10] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06237.html > [11] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06242.html > [12] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06243.html > [13] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06244.html > [14] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06246.html > [15] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06267.html > [16] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06268.html > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From gunnar.hellstrom@omnitor.se Tue Apr 30 04:44:36 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1516721F9BAD for ; Tue, 30 Apr 2013 04:44:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.374 X-Spam-Level: X-Spam-Status: No, score=-2.374 tagged_above=-999 required=5 tests=[AWL=-0.075, BAYES_00=-2.599, MIME_8BIT_HEADER=0.3] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id DOChjiFvy4Wz for ; Tue, 30 Apr 2013 04:44:31 -0700 (PDT) Received: from vsp-authed-02-02.binero.net (vsp-authed02.binero.net [195.74.38.226]) by ietfa.amsl.com (Postfix) with SMTP id 6006C21F9BB9 for ; Tue, 30 Apr 2013 04:44:27 -0700 (PDT) Received: from smtp01.binero.se (unknown [195.74.38.28]) by vsp-authed-02-02.binero.net (Halon Mail Gateway) with ESMTP for ; Tue, 30 Apr 2013 13:44:18 +0200 (CEST) Received: from [192.168.50.38] (h79n2fls31o933.telia.com [212.181.137.79]) (Authenticated sender: gunnar.hellstrom@omnitor.se) by smtp-09-01.atm.binero.net (Postfix) with ESMTPA id 63BAF3A277 for ; Tue, 30 Apr 2013 13:09:55 +0200 (CEST) Message-ID: <517FA686.8080109@omnitor.se> Date: Tue, 30 Apr 2013 13:09:58 +0200 From: Gunnar Hellstrom User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: rtcweb@ietf.org References: <517E7D65.7020805@ericsson.com> In-Reply-To: <517E7D65.7020805@ericsson.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Subject: Re: [rtcweb] =?windows-1252?q?WG_last_call_comments_on_use-case_and_r?= =?windows-1252?q?equirement_document=2C_=93Real-time_text=94?= X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Apr 2013 11:44:36 -0000 On 2013-04-29 16:02, Stefan Håkansson LK wrote: > > This relates to the comments to the WG last call of the use-cases and > requirements document [1]. > > The topic in this mail is Real-time text. This was discussed in [2] - > [8] (i hope I found all the relevant mails, please correct me if I > missed any). > > My reading of the discussion is that although there was some interest > in the use-case it was shown that it can be implemented on top of the > existing WebRTC environment and thus does not necessary drive any new > requirements. The counter argument was the need for common > interoperability for real-time text rather than silos, especially in > the context of emergency services. However as there no consensus on > any special requirements regarding emergency services it doesn't > appear that real-time text support requires that either. > > This can be summarized to that there was no consensus for additional > requirements and the basic functionality can clearly be implemented > using JS and suitable data transport,, and there is no need to add a > specific use-case for real-time text. > > Another way to view this is that the real-time text use-case is a > "telephony terminal" use-case with the codec being something like > T.140, which would narrow the discussion to a codec discussion. > > Anyway, with the current input I don’t think there is support to add a > new use-case on “Real-time text”. > > Stefan There was interest in having real-time text included in a uniform way in rtcweb applications. We took a pause in discussing the topic and agreed that a discussion document would be needed describing characteristic and pros and cons of three implementation alternatives: 1. RTP implementation alongside with the video and audio media, using T.140 on the presentation level and RFC 4103 as RTP packetization. This is well defined and easiest to achieve interoperability with SIP and emergency services. 2. Rtcweb data channel transport of T.140. This requires a standard protocol identity in the data channel so that it can be declared and agreed to be used between users of different servers. It is more complex to gateway it to SIP and coordinate with the other real-time media in a session. The discussion lately about SRTP keys have made me unsure if it is really feasible to have real-time text using anything else than RTP, because of the need to have all three media coordinated in the session. 3. JS implementation in same application as rtcweb usage, but transported with another web related mechanism, e.g. XMPP over BOSH. Possibly using draft XEP-0301 for the real-time text presentation and transmission. A bit complex to do SIP and emergency service interop, but nice as IM improvement. This would also need good work on JS libraries to make it convenient to use and opportunities for interop between rtcweb applications high. It is still my intention to contribute to such document. On 2013-01-30 I sent a proposal for how to include real-time text in the use-case document without indicating the exact solution. I think that line should be followed and that it is in line with your discussion of "no solution defined". /Gunnar > > > [1] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06136.html > > [2] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06160.html > [3] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06161.html > [4] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06202.html > [5] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06212.html > [6] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06213.html > [7] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06224.html > [8] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06228.html > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From ibc@aliax.net Tue Apr 30 07:52:14 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2506721F9AD8 for ; Tue, 30 Apr 2013 07:52:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.227 X-Spam-Level: X-Spam-Status: No, score=-2.227 tagged_above=-999 required=5 tests=[AWL=0.450, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id I4NpBODNAENw for ; Tue, 30 Apr 2013 07:52:05 -0700 (PDT) Received: from mail-qe0-f51.google.com (mail-qe0-f51.google.com [209.85.128.51]) by ietfa.amsl.com (Postfix) with ESMTP id DCA6321F9AB9 for ; Tue, 30 Apr 2013 07:52:04 -0700 (PDT) Received: by mail-qe0-f51.google.com with SMTP id cz11so335322qeb.10 for ; Tue, 30 Apr 2013 07:52:04 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:content-transfer-encoding :x-gm-message-state; bh=ToYCLlkqgnzv3OdYmPV6mH1AGbAiMxErWihHwiiz5Jc=; b=Gmuv2fjGqaNjXjWuv6mug3iWPi1pAMfs932iiuO1Hkoof9FL6gZifc6tzKeRWSIoZ4 7nCAjQRaLPqcNc2PpiiV7wGT5+zkrnIz+GHH7g6Jiaa8AsIk4pSC/KjZb+qW7CyUPPDH sPYmuFcHADSfu3nqZoTf0SwD5awoTAKc8v8CzOcVL4Gy/iEm1BjpZ+cGXPR3PywwFiDu G0C8jZmvrxnA8M/OY3WOH+i56ojL5jAj2lfPIsYSJWuhwdrtfNvxVLaX3I0FET18FdkI OKCDj1STIn6O6XmQXDyu3lSmCcoEXmw+eS+lm9XdwCjWECfst29A2p4svg503bcQQCOs a3cg== X-Received: by 10.224.66.136 with SMTP id n8mr19128170qai.84.1367333524165; Tue, 30 Apr 2013 07:52:04 -0700 (PDT) MIME-Version: 1.0 Received: by 10.49.81.175 with HTTP; Tue, 30 Apr 2013 07:51:43 -0700 (PDT) In-Reply-To: <5F38A528-70D7-414D-8462-BE3591EA26C1@cisco.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <517E0322.2060303@oracle.com> <53B9C161-C492-4F07-A9BD-75E17AE79AC9@phonefromhere.com> <5F38A528-70D7-414D-8462-BE3591EA26C1@cisco.com> From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= Date: Tue, 30 Apr 2013 16:51:43 +0200 Message-ID: To: Dan Wing Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Gm-Message-State: ALoCoQlusypYY1OJ2E5c8XUheIWDiPntTNr4IssJOjVH2Gxi8ampUg1eC501JU6B1mxgduGIZnF2 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Apr 2013 14:52:14 -0000 2013/4/30 Dan Wing : >> - DTLS-EKT-SRTP: This requires a gateway sending like "re-INVITE" for >> common operations as multimedia session transfer, which involves the >> gateway becoming both a media gateway and a complex signaling B2BUA >> (and we hate that, right?). > > That re-INVITE is necessary because Security Descriptions changed the SRT= P key, and Security Descriptions needs to send that re-INVITE. It is not t= he fault of DTLS-SRTP-EKT, because it doesn't send a re-INVITE when the SRT= P key changes (EKT handles key changes). > > If the objection is the re-INVITE when SRTP keys change, the solution is = eliminating Security Descriptions. The "solution" cannot be a media gateway that also must behave as a complex signaling B2BUA originating re-INVITEs by itself, since that means that a simple signaling pure proxy scenario is unfeasible. -- I=C3=B1aki Baz Castillo From richard.ejzak@alcatel-lucent.com Tue Apr 30 08:14:23 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D3EF821F9AD4 for ; Tue, 30 Apr 2013 08:14:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.598 X-Spam-Level: X-Spam-Status: No, score=-10.598 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id g4wIHEKSVf+H for ; Tue, 30 Apr 2013 08:14:16 -0700 (PDT) Received: from ihemail1.lucent.com (ihemail1.lucent.com [135.245.0.33]) by ietfa.amsl.com (Postfix) with ESMTP id 6F6D221F9BE3 for ; Tue, 30 Apr 2013 08:14:16 -0700 (PDT) Received: from us70tusmtp2.zam.alcatel-lucent.com (h135-5-2-64.lucent.com [135.5.2.64]) by ihemail1.lucent.com (8.13.8/IER-o) with ESMTP id r3UFECwq007628 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Tue, 30 Apr 2013 10:14:13 -0500 (CDT) Received: from US70TWXCHHUB04.zam.alcatel-lucent.com (us70twxchhub04.zam.alcatel-lucent.com [135.5.2.36]) by us70tusmtp2.zam.alcatel-lucent.com (GMO) with ESMTP id r3UFEA1p030376 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Tue, 30 Apr 2013 11:14:12 -0400 Received: from US70UWXCHMBA05.zam.alcatel-lucent.com ([169.254.10.44]) by US70TWXCHHUB04.zam.alcatel-lucent.com ([135.5.2.36]) with mapi id 14.02.0247.003; Tue, 30 Apr 2013 11:14:08 -0400 From: "Ejzak, Richard P (Richard)" To: Salvatore Loreto Thread-Topic: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb Thread-Index: AQHOQ19D/Cgh8/1Iw0eB7cqfjULVv5jtM2PAgAFh+gCAAEqnYA== Date: Tue, 30 Apr 2013 15:14:07 +0000 Message-ID: <03FBA798AC24E3498B74F47FD082A92F3BB9D535@US70UWXCHMBA05.zam.alcatel-lucent.com> References: <03FBA798AC24E3498B74F47FD082A92F3BB9C0F6@US70UWXCHMBA05.zam.alcatel-lucent.com> <517F658E.8010204@ericsson.com> In-Reply-To: <517F658E.8010204@ericsson.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [135.5.27.16] Content-Type: multipart/alternative; boundary="_000_03FBA798AC24E3498B74F47FD082A92F3BB9D535US70UWXCHMBA05z_" MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.57 on 135.245.2.33 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Apr 2013 15:14:24 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localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 357FE21F9BF8 for ; Tue, 30 Apr 2013 08:25:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -109.999 X-Spam-Level: X-Spam-Status: No, score=-109.999 tagged_above=-999 required=5 tests=[AWL=0.300, BAYES_00=-2.599, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pnhg8ygW0VZy for ; Tue, 30 Apr 2013 08:25:35 -0700 (PDT) Received: from mtv-iport-4.cisco.com (mtv-iport-4.cisco.com [173.36.130.15]) by ietfa.amsl.com (Postfix) with ESMTP id E52A721F9BFD for ; Tue, 30 Apr 2013 08:25:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1512; q=dns/txt; s=iport; t=1367335534; x=1368545134; h=mime-version:subject:from:in-reply-to:date:cc: content-transfer-encoding:message-id:references:to; bh=m9UD5iuUn2AVPWfff1bZPHOILmpOAqs3MrMWOHSLlLg=; b=IFG4pWoAwhHFrsXAb7gFSw5sCSXIPj1SJFXFhsMDK+/PjZHaYACQucfM OE/pJZOiDebofPzWxrMkp4pitKRwCbIpoBhQclSTGGx9mFvtneKrwkWh9 c+akMWT7tcXG1CnSAamHJSDS9ONmE5fBEM33tuwJVyXDzpn8PTZ+fy+Ad g=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AhAFAPzgf1GrRDoH/2dsb2JhbABSgwc3vlt+FnSCHwEBAQMBeQULC0ZXBgoJG4drBbFOjkGOZjMHgm9hA4kXjg+GE4sagy0c X-IronPort-AV: E=Sophos;i="4.87,582,1363132800"; d="scan'208";a="79946168" Received: from mtv-core-2.cisco.com ([171.68.58.7]) by mtv-iport-4.cisco.com with ESMTP; 30 Apr 2013 15:25:31 +0000 Received: from [10.32.240.196] ([10.32.240.196]) by mtv-core-2.cisco.com (8.14.5/8.14.5) with ESMTP id r3UFPQX0014969; Tue, 30 Apr 2013 15:25:30 GMT Content-Type: text/plain; charset=iso-8859-1 Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) From: Dan Wing In-Reply-To: Date: Tue, 30 Apr 2013 08:25:30 -0700 Content-Transfer-Encoding: quoted-printable Message-Id: <9F765AE3-A724-4F46-905F-C024954920E5@cisco.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <517E0322.2060303@oracle.com> <53B9C161-C492-4F07-A9BD-75E17AE79AC9@phonefromhere.com> <5F38A528-70D7-414D-8462-BE3591EA26C1@cisco.com> To: =?iso-8859-1?Q?I=F1aki_Baz_Castillo?= X-Mailer: Apple Mail (2.1503) Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Apr 2013 15:25:40 -0000 On Apr 30, 2013, at 7:51 AM, I=F1aki Baz Castillo wrote: > 2013/4/30 Dan Wing : >>> - DTLS-EKT-SRTP: This requires a gateway sending like "re-INVITE" = for >>> common operations as multimedia session transfer, which involves the >>> gateway becoming both a media gateway and a complex signaling B2BUA >>> (and we hate that, right?). >>=20 >> That re-INVITE is necessary because Security Descriptions changed the = SRTP key, and Security Descriptions needs to send that re-INVITE. It is = not the fault of DTLS-SRTP-EKT, because it doesn't send a re-INVITE when = the SRTP key changes (EKT handles key changes). >>=20 >> If the objection is the re-INVITE when SRTP keys change, the solution = is eliminating Security Descriptions. >=20 >=20 > The "solution" cannot be a media gateway that also must behave as a > complex signaling B2BUA originating re-INVITEs by itself, since that > means that a simple signaling pure proxy scenario is unfeasible. Webrtc has already made decisions that make a pure proxy unfeasible with = most legacy SIP networks: ICE-Lite, RTP/RTCP multiplexing on the same = port, and bundling. Those are trade-offs against interoperability but in = favor of a better webrtc design. =20 I would rather the complexity and security weakness of Security = Descriptions be confined to the interworking device, rather than exist = forever in webrtc. -d >=20 >=20 >=20 > -- > I=F1aki Baz Castillo > From richard.ejzak@alcatel-lucent.com Tue Apr 30 08:57:36 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7C48C21F9900 for ; Tue, 30 Apr 2013 08:57:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.599 X-Spam-Level: X-Spam-Status: No, score=-10.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7r1RFhkmL7sU for ; Tue, 30 Apr 2013 08:57:30 -0700 (PDT) Received: from ihemail2.lucent.com (ihemail2.lucent.com [135.245.0.35]) by ietfa.amsl.com (Postfix) with ESMTP id 670BB21F9A7F for ; Tue, 30 Apr 2013 08:57:28 -0700 (PDT) Received: from us70tusmtp2.zam.alcatel-lucent.com (h135-5-2-64.lucent.com [135.5.2.64]) by ihemail2.lucent.com (8.13.8/IER-o) with ESMTP id r3UFvOwY027469 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Tue, 30 Apr 2013 10:57:24 -0500 (CDT) Received: from US70UWXCHHUB01.zam.alcatel-lucent.com (us70uwxchhub01.zam.alcatel-lucent.com [135.5.2.48]) by us70tusmtp2.zam.alcatel-lucent.com (GMO) with ESMTP id r3UFvNrw023551 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Tue, 30 Apr 2013 11:57:24 -0400 Received: from US70UWXCHMBA05.zam.alcatel-lucent.com ([169.254.10.44]) by US70UWXCHHUB01.zam.alcatel-lucent.com ([135.5.2.48]) with mapi id 14.02.0247.003; Tue, 30 Apr 2013 11:57:23 -0400 From: "Ejzak, Richard P (Richard)" To: Randell Jesup , "rtcweb@ietf.org" Thread-Topic: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN Thread-Index: AQHOPxk/vGZCo0bYYE+LkWxcJO5/cpjlwv8AgACZxICAAFNvAIABBywAgAAJMQCAAQ8YgIAAPkQAgAQ0J1CAAObXgIAAw6eA Date: Tue, 30 Apr 2013 15:57:22 +0000 Message-ID: <03FBA798AC24E3498B74F47FD082A92F3BB9D580@US70UWXCHMBA05.zam.alcatel-lucent.com> References: <066.3120a55540cacaa74ee5fda0b5273a48@trac.tools.ietf.org> <5174C8D2.40504@matthew.at> <5177F7EE.1010909@matthew.at> <5179A362.2000309@jesup.org> <517A86CB.5020305@matthew.at> <517ABB06.5070807@jesup.org> <03FBA798AC24E3498B74F47FD082A92F3BB9C130@US70UWXCHMBA05.zam.alcatel-lucent.com> <517F0369.1050304@jesup.org> In-Reply-To: <517F0369.1050304@jesup.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [135.5.27.16] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.57 on 135.245.2.35 Subject: Re: [rtcweb] #13: Transport of DATA_CHANNEL_OPEN X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Apr 2013 15:57:36 -0000 > On 4/29/2013 6:34 PM, Randell Jesup wrote: > On 4/29/2013 7:11 AM, Ejzak, Richard P (Richard) wrote: > > After remaining neutral during most of this discussion about the need > for OPEN, I've finally come to the conclusion that Matthew is right. > The only thing the OPEN provides is the label, which is just an opaque > string with no meaning to the browser or any intermediaries. It only > has application significance. If this is the case, why not just use > stream id? What can you possibly do with label that you can't do with > pre-assigned stream ids (this is a serious question to Randell since it > is fundamental to whether we need OPEN)? Since label only has meaning > when both browsers run the same application, what does it matter if you > agree on a set of opaque strings to correspond to various functions or > just agree on a set of stream ids for these functions? It doesn't > change the complexity of the code and it doesn't even change the > readability of the code if you just enumerate the reserved stream ids > and "label" them in the code. >=20 > ok, multi-point response: >=20 > Please review the proposed JS API & dictionary posted here and the W3 > list a while ago (4 weeks?) >=20 > 1) Label isn't the only data transmitted in the Open message. Protocol > (which is particularly important to inter-operating apps, though can > still be useful for homogenous apps), and also having the channel > parameters be symmetric. Channels don't have to be symmetric, but if > they aren't then the receiver of the initial data would need to know by > some external method what the reverse channel parameters should be, and > then do operations to set it to the appropriate transfer mode. For homogeneous apps, the choice of channel parameters can as easily be tie= d to the stream id as the label. =20 The SCTP protocol id field should indicate the subprotocol being carried in= the data channel, so I don't see the need to separately announce this.=20 For non-homogeneous apps, there is no basis to negotiate anything until som= e standard subprotocols (beyond "raw data") are defined. In some cases the= subprotocol will dictate the channel parameters to be used (or will at lea= st severely constrain the options), so defaults could be assumed in simple = cases. In most more complex cases you will need a real negotiation mechani= sm (instead of OPEN) since most protocols require negotiation of additional= parameters that can't be expressed or negotiated using OPEN (e.g., the t.1= 40 cps). >=20 > 2) labels can specify some easy tags for the channel. For example, in > a "Hangout", if the server opens up a private chat channel on behalf of > another participant, it might do "pc.createDataChannel("Tom", { > protocol: "application/funkychat"});". The server might also open > one > with a label "Sarah", etc. I also envisioned (in this mailing list) an > FTP-like file transfer setup where the label is the filename being > transferred. (Think dragging a directory of files onto your chat > session to transfer to the other person.) This might be useful for some homogeneous apps, but the repeated use of the= word "might" in your text implies that this is not a necessity and that th= ere are reasonable alternatives. My real point is just that the justification for OPEN is weak and we could = easily do without it (assuming the proper handling of the protocol id). Pl= ease consider this as a friendly proposal to enhance/simplify the current D= ataChannel proposal that should be considered if there is enough support. >=20 > That said, you can always push anything signaled in Open into an > initial message in an ordered reliable channel. When it's NOT ordered > and reliable, then it gets more complex for the application to get > initial setup done for simple uses (retries to handle packet loss, in- > application acks, out-of-order delivery, etc, just to set up the > channel, or run a separate reliable negotiation channel (more likely), > which would need to be at least 1RTT to avoid races with trying to use > the unreliable channel before it's set up, etc. Yes, applications can > deal with all this, but some applications will want a simple JS API and > simple setup. And it will be tough to get right in a 0-RTT use for > non-reliable channels. >=20 > 3) I proposed something similar to your proposal a year ago, and > discussion and comments from people expecting to use this convinced me > to adapt the protocol proposal to include label (in particular comments > from Justin Uberti, but there were others). Perhaps some of them can > chime in, as I can only do so well at describing how they intend or > hope to use label. The other major piece, protocol, was added at the > strong request from the people in the room at IETF Atlanta. >=20 > Matthew's proposal is effectively little different than Martin's > proposal from IETF Orlando (or Matthew's assumed proposal, as his > comments aren't exactly an alternative proposal and some of the > comments imply a different model with an RTMFP-like initial packet > (i.e. > Open....). Per the minutes and earlier comments here, the agreement > was to adopt the Open draft, and not proceed with either of the two > alternatives given. I'll leave how to resolve this issue to the > chairs, and until told otherwise will continue to work on turning the > personal draft into a WG document. (And re-iterate my comments from > before - I think we have a solution here that everyone can work with, > even if it's not everyone's first choice.) >=20 >=20 >=20 > -- > Randell Jesup > randell-ietf@jesup.org >=20 >=20 > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb From richard@shockey.us Tue Apr 30 09:06:23 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5275C21F9428 for ; Tue, 30 Apr 2013 09:06:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -103.599 X-Spam-Level: X-Spam-Status: No, score=-103.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id adHHQyTQZtGh for ; Tue, 30 Apr 2013 09:06:18 -0700 (PDT) Received: from oproxy12-pub.bluehost.com (oproxy12-pub.bluehost.com [50.87.16.10]) by ietfa.amsl.com (Postfix) with SMTP id ABA8621F9C4A for ; Tue, 30 Apr 2013 09:06:18 -0700 (PDT) Received: (qmail 8700 invoked by uid 0); 30 Apr 2013 16:05:55 -0000 Received: from unknown (HELO box462.bluehost.com) (74.220.219.62) by oproxy12.bluehost.com with SMTP; 30 Apr 2013 16:05:55 -0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=shockey.us; s=default; h=Content-Transfer-Encoding:Content-Type:MIME-Version:Message-ID:Date:Subject:In-Reply-To:References:To:From; bh=21scHVjc/F3XklD3RJ0MCijfMghVGtjvKiOTYi2urxw=; b=Q5HUx3DPVbpO3lC0zjwQCe5nQ2JBzZdaChfdZG0yNXPtfWt3fo37qlkAzh2Q/oD/SZljIoI5pQkXOjEeM5Jm3VuMx8dcjn5/cugjesQLbOD/v76OVakoQXVbA8sWL01i; Received: from [72.66.111.101] (port=51145 helo=RSHOCKEYPC) by box462.bluehost.com with esmtpa (Exim 4.80) (envelope-from ) id 1UXD3y-0005lb-D6; Tue, 30 Apr 2013 10:05:54 -0600 From: "Richard Shockey" To: "'Gunnar Hellstrom'" , References: <517E7D25.2030706@ericsson.com> <517F95C3.90101@omnitor.se> In-Reply-To: <517F95C3.90101@omnitor.se> Date: Tue, 30 Apr 2013 12:05:50 -0400 Message-ID: <008601ce45bc$96b49bb0$c41dd310$@shockey.us> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQHXrB8OdXvw+A/V13wkLPQ/HfK/SgIsQWWcmMq+zSA= Content-Language: en-us X-Identified-User: {3286:box462.bluehost.com:shockeyu:shockey.us} {sentby:smtp auth 72.66.111.101 authed with richard@shockey.us} Subject: Re: [rtcweb] =?iso-8859-1?q?WG_last_call_comments_on_use-case_and_req?= =?iso-8859-1?q?uirement_document=2C_=22Emergency_Services=22?= X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Apr 2013 16:06:23 -0000 And http://www.fcc.gov/document/section-718-accessibility-requirements-intern= et- browsers-mobile-0 -----Original Message----- From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf = Of Gunnar Hellstrom Sent: Tuesday, April 30, 2013 5:58 AM To: rtcweb@ietf.org Subject: Re: [rtcweb] WG last call comments on use-case and requirement document, =93Emergency Services=94 I see a need to create a whole new strand of documents standardizing "application of RTCWEB". It would contain items that are not directly linked to details of the = media streams standardized in rtcweb, but are important in apparent = applications of the technology. It would contribute to the ambition to not create silos. Emergency service access is mainly one such application area. RFC 6881 says: ---------------------------------------------------------------------- SP-1: If a device or application expects to be able to place a call for help, the service provider that supports it MUST facilitate emergency calling. Some jurisdictions have regulations governing this. ED-2: Devices that create media sessions and exchange real-time audio, video, and/or text and that have the capability to establish sessions to = a wide variety of addresses and communicate over private IP networks or = the Internet SHOULD support emergency calls. Some jurisdictions have = regulations governing this. = ----------------------------------------------------------------------- These requirements will clearly apply to some rtcweb applications, and = it will be important to both remind rtcweb implementers about them and to develop common approaches to how to meet the requirements. One aspect that touches the recent discussion on SRTP usage in RTCWEB is that the specifications from the emergency service organisations EENA = and NENA prefer DTLS-SRTP but accept SDES. In summary: Emergency service requirements surely needs to be described = in rtcweb related specifications. If it is not mentioned among the kernel use-cases it should be in specifications about application of rtcweb. Gunnar On 2013-04-29 16:01, Stefan H=E5kansson LK wrote: > > > This relates to the comments to the WG last call of the use-cases and=20 > requirements document [1]. > > The topic in this mail is Emergency Services. This was discussed in=20 > [2] - [16] (i hope I found all the relevant mails, please correct me=20 > if I missed any), and my conclusion is that we should not add specific = > use-cases or requirements for Emergency Services. > > Stefan > > > [1] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06136.html > > [2] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06160.html > > [3] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06226.html > [4] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06227.html > [5] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06229.html > [6] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06231.html > [7] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06232.html > [8] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06239.html > [9] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06230.html > [10] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06237.html > [11] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06242.html > [12] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06243.html > [13] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06244.html > [14] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06246.html > [15] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06267.html > [16] http://www.ietf.org/mail-archive/web/rtcweb/current/msg06268.html > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb _______________________________________________ rtcweb mailing list rtcweb@ietf.org https://www.ietf.org/mailman/listinfo/rtcweb From ibc@aliax.net Tue Apr 30 09:09:39 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 897F521F9766 for ; Tue, 30 Apr 2013 09:09:39 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.317 X-Spam-Level: X-Spam-Status: No, score=-2.317 tagged_above=-999 required=5 tests=[AWL=0.360, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Pzy2OL5QcBjh for ; Tue, 30 Apr 2013 09:09:34 -0700 (PDT) Received: from mail-qe0-f41.google.com (mail-qe0-f41.google.com [209.85.128.41]) by ietfa.amsl.com (Postfix) with ESMTP id 4E5C421F9851 for ; Tue, 30 Apr 2013 09:09:34 -0700 (PDT) Received: by mail-qe0-f41.google.com with SMTP id b10so392835qen.14 for ; Tue, 30 Apr 2013 09:09:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:content-transfer-encoding :x-gm-message-state; bh=cVt5sfGow3dpiMIRvYPuYLeI36FUva7/61r0sHyUerQ=; b=AJbSijLqfs0aTWnowZztZqmFeFJL6AQtSjX9eCAhqdjnXIoQENs5mJtI3LgmOy74BB P7+szQcD/pZvyMUQT6bEpQORxsGRBiD/X3GCiPR4xON8DMHS4xTUDZ5gy0jUNwR896ts 6QA3rkmsVZbvNy9rnESv73GetBqMaRrd09MVrm9qE1dWFSM3XHtydtXRVdfI4n7qnduT wCSDuaF5SKYtNeNbNQdZBI2fbFxCayiExNf9WOzag/vtLi+rZy+TLVqSy80ab4UmGK/I xqII4d6ms67eSs7Syzai3NT7GUAM0wHQ1cVxnGRNf3pNLMqL/nfybVfR/e9HnsFHJLO6 6YmA== X-Received: by 10.49.74.226 with SMTP id x2mr67689050qev.63.1367338171689; Tue, 30 Apr 2013 09:09:31 -0700 (PDT) MIME-Version: 1.0 Received: by 10.49.81.175 with HTTP; Tue, 30 Apr 2013 09:09:11 -0700 (PDT) In-Reply-To: <9F765AE3-A724-4F46-905F-C024954920E5@cisco.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <517E0322.2060303@oracle.com> <53B9C161-C492-4F07-A9BD-75E17AE79AC9@phonefromhere.com> <5F38A528-70D7-414D-8462-BE3591EA26C1@cisco.com> <9F765AE3-A724-4F46-905F-C024954920E5@cisco.com> From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= Date: Tue, 30 Apr 2013 18:09:11 +0200 Message-ID: To: Dan Wing Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Gm-Message-State: ALoCoQkGhQC8v1OhdliBTkL5d/whM5AJVVnwHyhubow1ncj8SgVWht8fPVATbBU2d9r0WQhxg5KW Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Apr 2013 16:09:39 -0000 2013/4/30 Dan Wing : > Webrtc has already made decisions that make a pure proxy unfeasible with = most legacy SIP networks: ICE-Lite, RTP/RTCP multiplexing on the same port= , and bundling. ICE / rtcp-mux / bundle does not require sending a reINVITE by an intermediary signaling server *at all*, but just a media gateway. -- I=C3=B1aki Baz Castillo From dwing@cisco.com Tue Apr 30 09:23:37 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6388A21F9814 for ; Tue, 30 Apr 2013 09:23:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.149 X-Spam-Level: X-Spam-Status: No, score=-110.149 tagged_above=-999 required=5 tests=[AWL=0.150, BAYES_00=-2.599, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6PoE5GucttoQ for ; Tue, 30 Apr 2013 09:23:16 -0700 (PDT) Received: from mtv-iport-3.cisco.com (mtv-iport-3.cisco.com [173.36.130.14]) by ietfa.amsl.com (Postfix) with ESMTP id 5783C21F97FA for ; Tue, 30 Apr 2013 09:23:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=649; q=dns/txt; s=iport; t=1367338995; x=1368548595; h=mime-version:subject:from:in-reply-to:date:cc: content-transfer-encoding:message-id:references:to; bh=NaajQnvwcMwmUefnoeuJyNj36ftlGrJ8f4RqurmPObg=; b=EpBUYGTqjr+cvc1NOKlXExXhJQRIf+uGLw4LzfITYuhtvWaAiGduW9TL jl+bhi7USp+q9tHST5z7fDCw9famCvnzxhj7ScVIJnjAzbNv8GsO0zDIX GvPQxeVs3rD//xdm2jlPLpZvjkRUiFuSFfI5uqurv5/nYMpshW3TdoH9B o=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AhUFAFvvf1GrRDoG/2dsb2JhbABSgwc3gm+7bH4WdIIfAQEBAwF5BQsLRlcGE4gGBbFhjlyOZjMHgm9hA4kXjg+GE4sagy0c X-IronPort-AV: E=Sophos;i="4.87,582,1363132800"; d="scan'208";a="77445491" Received: from mtv-core-1.cisco.com ([171.68.58.6]) by mtv-iport-3.cisco.com with ESMTP; 30 Apr 2013 16:23:15 +0000 Received: from [10.32.240.196] ([10.32.240.196]) by mtv-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id r3UGNDlJ012400; Tue, 30 Apr 2013 16:23:14 GMT Content-Type: text/plain; charset=iso-8859-1 Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) From: Dan Wing In-Reply-To: Date: Tue, 30 Apr 2013 09:23:13 -0700 Content-Transfer-Encoding: quoted-printable Message-Id: <2F6AE875-D030-457D-A056-37B2E4783FA8@cisco.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <517E0322.2060303@oracle.com> <53B9C161-C492-4F07-A9BD-75E17AE79AC9@phonefromhere.com> <5F38A528-70D7-414D-8462-BE3591EA26C1@cisco.com> <9F765AE3-A724-4F46-905F-C024954920E5@cisco.com> To: =?iso-8859-1?Q?I=F1aki_Baz_Castillo?= X-Mailer: Apple Mail (2.1503) Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Apr 2013 16:23:38 -0000 On Apr 30, 2013, at 9:09 AM, I=F1aki Baz Castillo wrote: > 2013/4/30 Dan Wing : >> Webrtc has already made decisions that make a pure proxy unfeasible = with most legacy SIP networks: ICE-Lite, RTP/RTCP multiplexing on the = same port, and bundling. >=20 > ICE / rtcp-mux / bundle does not require sending a reINVITE by an > intermediary signaling server *at all*, but just a media gateway. Agreed, they work differently. =20 But ICE and RTP/RTCP multiplexing require participation on the media = path (that is, an SBC or SBC-like function), and cannot be accomplished = with a SIP proxy. -d From ibc@aliax.net Tue Apr 30 09:29:27 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 61FE821F9AB1 for ; Tue, 30 Apr 2013 09:29:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.078 X-Spam-Level: X-Spam-Status: No, score=-1.078 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, J_CHICKENPOX_43=0.6, MIME_8BIT_HEADER=0.3, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rXSQhfAVjnRS for ; Tue, 30 Apr 2013 09:29:27 -0700 (PDT) Received: from mail-qc0-x235.google.com (mail-qc0-x235.google.com [IPv6:2607:f8b0:400d:c01::235]) by ietfa.amsl.com (Postfix) with ESMTP id DA03121F98F7 for ; Tue, 30 Apr 2013 09:29:26 -0700 (PDT) Received: by mail-qc0-f181.google.com with SMTP id a22so317504qcs.12 for ; Tue, 30 Apr 2013 09:29:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:content-transfer-encoding :x-gm-message-state; bh=0TZ5QXWO/D54+3f5J1AxHZap0acnmnKhURNCN1B0ook=; b=mJ3DemTiUunbRfRm/68P6h5RiMrpupvxxOdj52UBieia+67xbQwOSioS6lzGYYl10r +rW8hmhueNnuJzfOSPQy9gYkHVdqsIYy0W++6HPF0rVt+OG2s8xnBHrbPG6KrQlGsZwb Edr/st7YO9OZlDo6IYcSuqNEydIfHjlFAJKHgeT6ZrRWqXDQieFC0HPYTalSzvAD7IrU BeueApN/ltaIROlvrNbYhaLOAlqgV3JU8G5SDn3R509Yn8K98/2nadzHVV6ujWmRHAqm ygrNZVLGepODX29BdhXqp1aXlJsj9b0Xsuf6eXVdbaTYdIvyU5Qs+PYdLvf+guzbrJng DZlQ== X-Received: by 10.49.81.200 with SMTP id c8mr68503184qey.50.1367339366055; Tue, 30 Apr 2013 09:29:26 -0700 (PDT) MIME-Version: 1.0 Received: by 10.49.81.175 with HTTP; Tue, 30 Apr 2013 09:29:04 -0700 (PDT) In-Reply-To: <2F6AE875-D030-457D-A056-37B2E4783FA8@cisco.com> References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <517E0322.2060303@oracle.com> <53B9C161-C492-4F07-A9BD-75E17AE79AC9@phonefromhere.com> <5F38A528-70D7-414D-8462-BE3591EA26C1@cisco.com> <9F765AE3-A724-4F46-905F-C024954920E5@cisco.com> <2F6AE875-D030-457D-A056-37B2E4783FA8@cisco.com> From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= Date: Tue, 30 Apr 2013 18:29:04 +0200 Message-ID: To: Dan Wing Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Gm-Message-State: ALoCoQlbNokCw4i/pgzG5HxO0hm4tstVKaWuhvQxMNYUpNbI3MLugi5U/CjHoUWrBo9k7R6otvDz Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Apr 2013 16:29:27 -0000 2013/4/30 Dan Wing : > But ICE and RTP/RTCP multiplexing require participation on the media path= (that is, an SBC or SBC-like function), and cannot be accomplished with a = SIP proxy. Of course, but a SIP proxy (which cannot generate a reINVITE by itself) is really different than a B2BUA (which breaks pure signaling scenarios). DTLS+EKT requires a B2BUA so that's not good. -- I=C3=B1aki Baz Castillo From bernard_aboba@hotmail.com Tue Apr 30 10:47:11 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1019F21F9B7C for ; Tue, 30 Apr 2013 10:47:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.074 X-Spam-Level: X-Spam-Status: No, score=-102.074 tagged_above=-999 required=5 tests=[AWL=0.524, BAYES_00=-2.599, HTML_MESSAGE=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XUK85OJCfxfx for ; Tue, 30 Apr 2013 10:47:06 -0700 (PDT) Received: from blu0-omc3-s27.blu0.hotmail.com (blu0-omc3-s27.blu0.hotmail.com [65.55.116.102]) by ietfa.amsl.com (Postfix) with ESMTP id 2069821F9B2F for ; Tue, 30 Apr 2013 10:47:06 -0700 (PDT) Received: from BLU169-W11 ([65.55.116.74]) by blu0-omc3-s27.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Tue, 30 Apr 2013 10:47:05 -0700 X-EIP: [mjOD/o4lWJ5+2PgWSgRFq8awddw14pTy] X-Originating-Email: [bernard_aboba@hotmail.com] Message-ID: Content-Type: multipart/alternative; boundary="_741fb516-2033-4363-8f9c-8750a6dd3cee_" From: Bernard Aboba To: Richard Shockey , "rtcweb@ietf.org" Date: Tue, 30 Apr 2013 10:47:05 -0700 Importance: Normal In-Reply-To: <008601ce45bc$96b49bb0$c41dd310$@shockey.us> References: <517E7D25.2030706@ericsson.com> <517F95C3.90101@omnitor.se>, <008601ce45bc$96b49bb0$c41dd310$@shockey.us> MIME-Version: 1.0 X-OriginalArrivalTime: 30 Apr 2013 17:47:05.0832 (UTC) FILETIME=[BAB2E680:01CE45CA] Subject: Re: [rtcweb] WG last call comments on use-case and requirement document, "Emergency Services" X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Apr 2013 17:47:11 -0000 --_741fb516-2033-4363-8f9c-8750a6dd3cee_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable The below reference is significant for WebRTC because it indicates that bro= wsers are regulated under Section 716 of CVAA with respect to "Advanced Com= munications Services". Are there also provisions of the Report & Order re= levant to emergency services?Richard pointed to: http://www.fcc.gov/document/section-718-accessibility-requirements-interne= t-browsers-mobile-0 = --_741fb516-2033-4363-8f9c-8750a6dd3cee_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
The below reference is significa= nt for WebRTC because it =3Bindicates that browsers are regulated under= Section 716 of CVAA =3Bwith respect to "Advanced =3BCommunications= Services". =3B =3B Are there also provisions of the Report &=3B= Order relevant to emergency services?
= --_741fb516-2033-4363-8f9c-8750a6dd3cee_-- From martin.thomson@gmail.com Tue Apr 30 11:28:49 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2011621F9AF5 for ; Tue, 30 Apr 2013 11:28:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cjXmrnIa+Hsm for ; Tue, 30 Apr 2013 11:28:48 -0700 (PDT) Received: from mail-wg0-x232.google.com (mail-wg0-x232.google.com [IPv6:2a00:1450:400c:c00::232]) by ietfa.amsl.com (Postfix) with ESMTP id 73FAF21F99D8 for ; Tue, 30 Apr 2013 11:28:48 -0700 (PDT) Received: by mail-wg0-f50.google.com with SMTP id m15so781019wgh.5 for ; Tue, 30 Apr 2013 11:28:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=riQy7hbpt8Q7croH+/tTCrkRPchZ9NWCdrFDUVau0RM=; b=TN5Oc1kHNrgy4pEy6QhpsEuYHVqTOYTgnz5xfwEjOvklZQ/Pb3oIPXFX5DnaqC4u18 48hmutNdyABqvS6NqGI9tuZd2gbWUxWBbU57RqFS61JEewmLVhswNhr3Taroc+SGQM8I s8XvkV6WnlUxJVNEqmK2sbI0YBSsaGHpoXHu25MwBQ4V34Z7Y+vqmStiarfQHtBnmECh dcq1qi+QEllcspNE0gUg7Hy7I0qQDx/78AW/SLoZzMsH98Y9eyo0rfOyIZzJETI7lD+E dAOKUYk5nJQyDPLLmn+r1BcVTJ9tEFfrMhsKuGZ3sc59LkQig5ZJoREazLF19JhzWx6l cGoA== MIME-Version: 1.0 X-Received: by 10.194.109.227 with SMTP id hv3mr41218210wjb.32.1367346527655; Tue, 30 Apr 2013 11:28:47 -0700 (PDT) Received: by 10.194.33.102 with HTTP; Tue, 30 Apr 2013 11:28:47 -0700 (PDT) In-Reply-To: <03FBA798AC24E3498B74F47FD082A92F3BB9D535@US70UWXCHMBA05.zam.alcatel-lucent.com> References: <03FBA798AC24E3498B74F47FD082A92F3BB9C0F6@US70UWXCHMBA05.zam.alcatel-lucent.com> <517F658E.8010204@ericsson.com> <03FBA798AC24E3498B74F47FD082A92F3BB9D535@US70UWXCHMBA05.zam.alcatel-lucent.com> Date: Tue, 30 Apr 2013 11:28:47 -0700 Message-ID: From: Martin Thomson To: "Ejzak, Richard P (Richard)" Content-Type: text/plain; charset=UTF-8 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Apr 2013 18:28:49 -0000 On 30 April 2013 08:14, Ejzak, Richard P (Richard) wrote: > We could > mix SDES for voice/video with DTLS for DataChannels in these scenarios, but > an all-SDES approach (for keying) would be more efficient. I'm going to be blunt: this is crazy talk. DTLS doesn't work that way. What you are talking about is a whole new protocol. I'm sorry to say that I cannot wish you success and good fortune if you intend to continue down that path. Now, you could do what people do in the real world and send data as an RTP payload. None of this SCTP mess. But we decided not to do that for a number of reasons (i.e., the number of hands that were raised) and by grim we don't go back on our decisions in this working group. From ekr@rtfm.com Tue Apr 30 11:53:06 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 55D3421F9C5D for ; Tue, 30 Apr 2013 11:53:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -100.425 X-Spam-Level: X-Spam-Status: No, score=-100.425 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FH_RELAY_NODNS=1.451, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RDNS_NONE=0.1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xksDVVnH5LTY for ; Tue, 30 Apr 2013 11:53:01 -0700 (PDT) Received: from mail-qc0-x22c.google.com (mail-qc0-x22c.google.com [IPv6:2607:f8b0:400d:c01::22c]) by ietfa.amsl.com (Postfix) with ESMTP id 2190F21F9A86 for ; Tue, 30 Apr 2013 11:53:01 -0700 (PDT) Received: by mail-qc0-f172.google.com with SMTP id b25so380910qca.17 for ; Tue, 30 Apr 2013 11:52:59 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:x-originating-ip:in-reply-to:references :from:date:message-id:subject:to:cc:content-type:x-gm-message-state; bh=1ykk5eSA3IyYEFjTNC6pwWRj7F5r6NCFC0dsLUYgLmk=; b=el0phXgE6fHAxBPz23HeYB3m14ozylEsMd8H2TUdJKS82uSddL8s1mRsz/v1/Rav+j S3WYcAyQfaKOs9X6h3yP6wJaXVM9DQOY6pLOgFzZVT7ve+vapNXz55D1s/vxCoCCWzMM MXHt2HamL3PxQXkYNE7BxKywvB97Wei6AqP+H6dcyHGXAU9/T6ckACeHpnQdhqRgCkw9 EL0yFA9UQ/Lbeh2pq7VfTWAEIyS9QSVP342OU2XB7TrkqorBx+rGvfk3exMSDATSoZrp Dl+BazF7gP5nhq3GG8sLrsLXzIfiqPqqy2rqsmf6OVLNHCleIlYhofEhGoDZ7CwODt76 aCzw== X-Received: by 10.49.3.6 with SMTP id 6mr40135818qey.64.1367347979296; Tue, 30 Apr 2013 11:52:59 -0700 (PDT) MIME-Version: 1.0 Received: by 10.49.17.66 with HTTP; Tue, 30 Apr 2013 11:52:19 -0700 (PDT) X-Originating-IP: [74.95.2.173] In-Reply-To: <03FBA798AC24E3498B74F47FD082A92F3BB9D535@US70UWXCHMBA05.zam.alcatel-lucent.com> References: <03FBA798AC24E3498B74F47FD082A92F3BB9C0F6@US70UWXCHMBA05.zam.alcatel-lucent.com> <517F658E.8010204@ericsson.com> <03FBA798AC24E3498B74F47FD082A92F3BB9D535@US70UWXCHMBA05.zam.alcatel-lucent.com> From: Eric Rescorla Date: Tue, 30 Apr 2013 11:52:19 -0700 Message-ID: To: "Ejzak, Richard P (Richard)" Content-Type: multipart/alternative; boundary=047d7bdc0aba97331104db98822d X-Gm-Message-State: ALoCoQk2z4IMzmXA3qV4aNkdSj8uzQbIVFlGbiFCMQMQrNIrsO5GmfEdrs9O/Q75xy7iw7O1lhaN Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Apr 2013 18:53:06 -0000 --047d7bdc0aba97331104db98822d Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On Tue, Apr 30, 2013 at 8:14 AM, Ejzak, Richard P (Richard) < richard.ejzak@alcatel-lucent.com> wrote: > Hi Salvatore,**** > > =93are you proposing that when/if we will eventually use SDES we have to > assure that the key exchanged > is the same key used by the DTLS session, on top of which runs Datachanne= l?=94 > is a reasonable interpretation of what I am proposing, although I would > have described this as my =93preference=94 rather than a concrete proposa= l. We > could mix SDES for voice/video with DTLS for DataChannels in these > scenarios, but an all-SDES approach (for keying) would be more efficient.= * > *** > > ** ** > > I know that this option is not currently defined, although it does seem > technically feasible (which is why I asked to ekr to comment). > I don't think this is really practical. It would require defining a new crypto protocol to carry the SCTP. -Ekr --047d7bdc0aba97331104db98822d Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On Tue, Apr 30, 2013 at 8:14 AM, Ejzak, Richard P (Richard) <richard.ejzak@alcatel-lucent.com> wrote:

Hi Salvatore,

=93are you proposi= ng that when/if we will eventually use SDES we have to assure that the key = exchanged
is the same key used by the DTLS session, on top of which runs Datachannel?= =94 is a reasonable interpretation of what I am = proposing, although I would have described this as my =93preference=94 rather than a concrete proposal. =A0We could mix SDES for voice/video with= DTLS for DataChannels in these scenarios, but an all-SDES approach (for ke= ying) would be more efficient.

=A0<= /p>

I know that this option i= s not currently defined, although it does seem technically feasible (which = is why I asked to ekr to comment).


I don't think this is real= ly practical. It would require defining a new crypto protocol
to = carry the SCTP.

-Ekr
=A0
--047d7bdc0aba97331104db98822d-- From richard.ejzak@alcatel-lucent.com Tue Apr 30 12:28:25 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 05AA021F9A50 for ; Tue, 30 Apr 2013 12:28:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.598 X-Spam-Level: X-Spam-Status: No, score=-10.598 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id w8CBJsCVkvQK for ; Tue, 30 Apr 2013 12:28:18 -0700 (PDT) Received: from ihemail2.lucent.com (ihemail2.lucent.com [135.245.0.35]) by ietfa.amsl.com (Postfix) with ESMTP id 5835221F984B for ; Tue, 30 Apr 2013 12:28:17 -0700 (PDT) Received: from us70tusmtp2.zam.alcatel-lucent.com (h135-5-2-64.lucent.com [135.5.2.64]) by ihemail2.lucent.com (8.13.8/IER-o) with ESMTP id r3UJSAso020920 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Tue, 30 Apr 2013 14:28:11 -0500 (CDT) Received: from US70UWXCHHUB01.zam.alcatel-lucent.com (us70uwxchhub01.zam.alcatel-lucent.com [135.5.2.48]) by us70tusmtp2.zam.alcatel-lucent.com (GMO) with ESMTP id r3UJS7T8028457 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Tue, 30 Apr 2013 15:28:10 -0400 Received: from US70UWXCHMBA05.zam.alcatel-lucent.com ([169.254.10.44]) by US70UWXCHHUB01.zam.alcatel-lucent.com ([135.5.2.48]) with mapi id 14.02.0247.003; Tue, 30 Apr 2013 15:28:08 -0400 From: "Ejzak, Richard P (Richard)" To: Eric Rescorla Thread-Topic: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb Thread-Index: AQHOQ19D/Cgh8/1Iw0eB7cqfjULVv5jtM2PAgAFh+gCAAEqnYIAAg/mA//++3cA= Date: Tue, 30 Apr 2013 19:28:08 +0000 Message-ID: <03FBA798AC24E3498B74F47FD082A92F3BB9E658@US70UWXCHMBA05.zam.alcatel-lucent.com> References: <03FBA798AC24E3498B74F47FD082A92F3BB9C0F6@US70UWXCHMBA05.zam.alcatel-lucent.com> <517F658E.8010204@ericsson.com> <03FBA798AC24E3498B74F47FD082A92F3BB9D535@US70UWXCHMBA05.zam.alcatel-lucent.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [135.5.27.16] Content-Type: multipart/alternative; boundary="_000_03FBA798AC24E3498B74F47FD082A92F3BB9E658US70UWXCHMBA05z_" MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.57 on 135.245.2.35 Cc: "rtcweb@ietf.org" Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Apr 2013 19:28:25 -0000 --_000_03FBA798AC24E3498B74F47FD082A92F3BB9E658US70UWXCHMBA05z_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Ekr, Thanks for your response. I really just wanted to raise awareness of this = issue, and to get clarification of what "SDES for WebRTC" really means. "I= mpractical" and "crazy talk" in this case are other ways of saying that it'= s more work than someone wants to do, but I respect that. Most of the bene= fit of SDES keying for WebRTC comes from addressing audio and video media. Richard From: Eric Rescorla [mailto:ekr@rtfm.com] Sent: Tuesday, April 30, 2013 1:52 PM To: Ejzak, Richard P (Richard) Cc: Salvatore Loreto; rtcweb@ietf.org Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWeb On Tue, Apr 30, 2013 at 8:14 AM, Ejzak, Richard P (Richard) > wrote: Hi Salvatore, "are you proposing that when/if we will eventually use SDES we have to assu= re that the key exchanged is the same key used by the DTLS session, on top of which runs Datachannel?= " is a reasonable interpretation of what I am proposing, although I would h= ave described this as my "preference" rather than a concrete proposal. We = could mix SDES for voice/video with DTLS for DataChannels in these scenario= s, but an all-SDES approach (for keying) would be more efficient. I know that this option is not currently defined, although it does seem tec= hnically feasible (which is why I asked to ekr to comment). I don't think this is really practical. It would require defining a new cry= pto protocol to carry the SCTP. -Ekr --_000_03FBA798AC24E3498B74F47FD082A92F3BB9E658US70UWXCHMBA05z_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Ekr,

Thanks for your response.=   I really just wanted to raise awareness of this issue, and to get cl= arification of what “SDES for WebRTC” really means.  ̶= 0;Impractical” and “crazy talk” in this case are other ways of saying that it= ’s more work than someone wants to do, but I respect that.  Most= of the benefit of SDES keying for WebRTC comes from addressing audio and v= ideo media.

 <= /p>

Richard=

 <= /p>

From: Eric Res= corla [mailto:ekr@rtfm.com]
Sent: Tuesday, April 30, 2013 1:52 PM
To: Ejzak, Richard P (Richard)
Cc: Salvatore Loreto; rtcweb@ietf.org
Subject: Re: [rtcweb] SDP Security Descriptions (RFC 4568) and RTCWe= b

 

On Tue, Apr 30, 2013 at 8:14 AM, Ejzak, Richard P (R= ichard) <richard.ejzak@alcatel-lucent.com> wrote:

Hi Salvatore,

“are you proposing that wh= en/if we will eventually use SDES we have to assure that the key exchanged
is the same key used by the DTLS session, on top of which runs Datachannel?= ” is a reasonable interpretation of what I= am proposing, although I would have described this as my “preference= ” rather than a concrete proposal.  We could mix SDES for voice/video w= ith DTLS for DataChannels in these scenarios, but an all-SDES approach (for= keying) would be more efficient.

 

I know that this option is not currentl= y defined, although it does seem technically feasible (which is why I asked to ekr to comment).

 

I don't think this is really practical. It would req= uire defining a new crypto protocol

to carry the SCTP.

 

-Ekr

 

--_000_03FBA798AC24E3498B74F47FD082A92F3BB9E658US70UWXCHMBA05z_-- From fluffy@cisco.com Tue Apr 30 22:10:42 2013 Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7118521F8605 for ; Tue, 30 Apr 2013 22:10:32 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.299 X-Spam-Level: X-Spam-Status: No, score=-110.299 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WXNKifjWxK-P for ; Tue, 30 Apr 2013 22:10:26 -0700 (PDT) Received: from rcdn-iport-1.cisco.com (rcdn-iport-1.cisco.com [173.37.86.72]) by ietfa.amsl.com (Postfix) with ESMTP id 398BF21F896E for ; Tue, 30 Apr 2013 22:10:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=805; q=dns/txt; s=iport; t=1367385023; x=1368594623; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-id:content-transfer-encoding: mime-version; bh=DLZfOtp1OmhgwEcHwmel0BMjbAW3iyMAA6W76NaW3Wk=; b=CKh4GNUQSswu6D7QzAya2JRKubu2o5VPogCA+SMjYPN962gJXq44+e5u yWoOsnnWVdatLprvQ0ygbDPGLCe/XopuO56G+lKqRgEF315yizxL6E7gG g6gMK/eGFAanzNaOUwwh16o718qd6LfX8Ypi22C7jKZaR36vY8Yb3GQfq E=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AkAFABeigFGtJXG+/2dsb2JhbABSgweDJrwmfhZ0gh8BAQEDAXkFCwIBKiQyJQIEDgUIh34Gvx+NZYEDMQeCb2EDqFODDYIn X-IronPort-AV: E=Sophos;i="4.87,587,1363132800"; d="scan'208";a="204875467" Received: from rcdn-core2-3.cisco.com ([173.37.113.190]) by rcdn-iport-1.cisco.com with ESMTP; 01 May 2013 05:10:21 +0000 Received: from xhc-aln-x06.cisco.com (xhc-aln-x06.cisco.com [173.36.12.80]) by rcdn-core2-3.cisco.com (8.14.5/8.14.5) with ESMTP id r415ALNK025334 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Wed, 1 May 2013 05:10:21 GMT Received: from xmb-aln-x02.cisco.com ([169.254.5.192]) by xhc-aln-x06.cisco.com ([173.36.12.80]) with mapi id 14.02.0318.004; Wed, 1 May 2013 00:10:21 -0500 From: "Cullen Jennings (fluffy)" To: Harald Alvestrand Thread-Topic: =?Windows-1252?Q?Network_times_=85_was_SDP_Security_Descriptions_(RFC_456?= =?Windows-1252?Q?8)_and_RTCWeb?= Thread-Index: AQHORiot3hT0toA1x0SAjJDE87njGw== Date: Wed, 1 May 2013 05:10:21 +0000 Message-ID: References: <3FA2E46D-C98E-4FC0-9F1D-AD595A861CE1@iii.ca> <20130425202238.74EF321F96A5@ietfa.amsl.com> <03FBA798AC24E3498B74F47FD082A92F3BB8FAF7@US70UWXCHMBA04.zam.alcatel-lucent.com> <9F33F40F6F2CD847824537F3C4E37DDF0E6C04AF@MCHP04MSX.global-ad.net> <4AA3A95D6033ED488F8AE4E45F47448742B13620@WABOTH9MSGUSR8B.ITServices.sbc.com> <829F9A35-5F23-4A0F-9831-80478F70965E@phonefromhere.com> <517E2F6A.30905@alvestrand.no> In-Reply-To: <517E2F6A.30905@alvestrand.no> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.20.249.164] Content-Type: text/plain; charset="Windows-1252" Content-ID: <56D0ED8C9724C4468E31FBD4C769E7CB@emea.cisco.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Cc: "rtcweb@ietf.org" Subject: [rtcweb] =?windows-1252?q?Network_times_=85_was_SDP_Security_Desc?= =?windows-1252?q?riptions_=28RFC_4568=29_and_RTCWeb?= X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 May 2013 05:10:43 -0000 On Apr 29, 2013, at 2:29 AM, Harald Alvestrand wrote= : > Would it be possible to get real data on 1) and 2) here, so that we can s= top talking about "slow" and instead talk about "N milliseconds"? >=20 I did try and round up a bunch of data for ping times from India to Singapo= re as some people were suggesting these were 1500ms.=20 I got measurements from both home DSL and more business class from a range = of sources in India. It seems that anywhere one could run video, you can pi= ng any of Singapore, Tokyo, Boston, Palo Alto, and London in less than 250 = ms one way. If someone has an actually link that is getting 1500 ms out of = India, I'd love to get the info so I can see what I can learn (the buffer b= loat folks want to hear about this :-)