From owner-malloc@catarina.usc.edu  Mon Jun 11 12:36:36 2001
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Date: Mon, 11 Jun 2001 11:59:46 +0200 (MET DST)
From: Erik Guttman <Erik.Guttman@sun.com>
Reply-To: Erik Guttman <Erik.Guttman@sun.com>
Subject: ZMAAP - please review
To: mboned@network-services.uoregon.edu, malloc@catarina.usc.edu
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The Zeroconf WG has issued two internet drafts related to IP multicast.
These (short) documents have not received technical review.  

  draft-ietf-zeroconf-zmaap-01.txt      Standards Track

     We intend to recommend ZMAAP be published as a Proposed 
     Standard, so I am seeking your assistance.

  draft-ietf-zeroconf-zmaap-api-00.txt  Informational (or not needed?)

     This document specifies additional considerations not
     present in RFC 2771 and specifies concrete APIs in Java
     and C.  Is this document useful?

Please send comments on these documents to zeroconf@merit.edu

Erik Guttman
ZEROCONF WG cochair


From owner-malloc@catarina.usc.edu  Wed Jun 20 09:08:35 2001
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From: Arne Hauenschild <ahauensc@TechFak.Uni-Bielefeld.DE>
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Date: Wed, 20 Jun 2001 14:09:17 +0200
To: malloc@catarina.usc.edu
Cc: pgmuscal@TechFak.Uni-Bielefeld.DE
Subject: Questions about MZAP
Message-ID: <20010620140917.B14114@stromboli.TechFak.Uni-Bielefeld.DE>
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Hello!

We are a group of students trying to develop a simulation of administratively
scoped multicast including MZAP. 

While implementing MZAP we had some problems understanding several points
in the RFC 2776.

The first problem is about the announcing of a router's ID using ZCMs.
According to the definition of the MZAP header in the RFC the source 
IP address of a zam is the address of the interface originated the message.
But does that mean that if a ZBR has 2 interfaces in a scope-zone it announces
itself with different addresses?

Example 1:
          :   [B]
          :  / |  
          : /  | 
          :/   | 
          X1   |  
  -----[A]:    | 
          X2   | 
          :\   | 
          : \  | 
          :  \ |
          :   [C]
          :
	
 _____________________________
| .... zone boundary          |
|                             |
|  ---- network connection    |
|                             |
|  X    boundary on interface |
 -----------------------------
	  
In this example ZBR A announces itself with the IP address of the 
interface X1 to B and with the address of interface X2 to C. 
When we use a routing protocol like DVMRP the ZBRs B and C won't forward
the packets received from A towards each other. So B will signal a convexity 
problem because it reads about X2 in the ZCMs from C but doesn't receive a 
ZCM from the interfaceX2 directly.
That won't happen if the source address in the ZCMs is always the lowest address 
used by a interface in the scope zone but that isn't the way described in the 
RFC. 
Another problem is about the configuration of a ZBR for the Local-Scope zone.

RFC 2776: 
"When a ZBR is configured correctly, it can deduce which side of the
boundary is inside the scope zone and which side is outside it."

If there is only one interface with a boundary on it the router can assume that 
this interface is in one zone and the other interfaces are in the other one.
But how could a ZBR with multiple interfaces configured with boundaries decide 
which of these interfaces belong to the same zone?


Example 2: 
                          :   [B]-----[D]----
                          :  /         |
        local zone 1      : /          |
                          :/           |
                          X1          [E]----
              ---------[A]:          /
                          X2        /
                          :\       /
                          : \     /  local zone 2
                          :  \   /
                          :   [C]
                          :
 
  fig 1: router A has two interfaces in local zone 2
 
 
                          :
                          :   [B]-----[D]----
                          :  /    local zone 3
        local zone 1      : /    ..............
                          :/     :
                          X      :    [E]----
              ---------[A]:......:   /
                          X         /
                          :\       /
                          : \     /  local zone 2
                          :  \   /
                          :   [C]
                          :
 
  fig 2: router A has one interface in local zone 2
         and one in local zone 3


How can router A decide which of the two possibilities is the correct one?

In this context we got a little confused about the definition of a boundary.
Packets sent by router B must be forwarded by router A in order to arrive router
C. This can only be done if the packets are received over the boundary on X1
and leave router A again over a boundary on interface X2. Is that the correct
behaviour although the packet has to cross two boundaries?
In RFC 2365, line 102 a ZBR is defined this way:

   Such a router, called a boundary router, does not forward
   packets matching an interface's boundary definition in either
   direction (the bi-directional check prevents problems with multi-
   access networks)

There is no exception mentioned for the Local-Scope zone.

The last question is about sending ZAMs. In RFC 2776, line 1058
is written

  In addition, the ZBR re-originates the ZAM out each interface with a
  Local Scope boundary [...]

In figure 2 in the same RFC the router B receives the ZAM over a boundary
but re-originates it out an interface without a boundary on it. 

Thanks in advance.

-- 
Arne Hauenschild




From owner-malloc@catarina.usc.edu  Wed Jun 27 08:57:30 2001
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Date: Wed, 27 Jun 2001 08:21:02 -0400
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From: "Brian Haberman" <haberman@nortelnetworks.com>
Reply-To: "Brian Haberman" <haberman@nortelnetworks.com>
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To: MALLOC Mailing List <malloc@catarina.usc.edu>
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Subject: Updated IPv6 allocation draft
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I have updated the IPv6 allocation guidelines draft to incorporate
comments made during IESG review.  A key change to the document is
clarification of the role IANA plays.  Please take a look and post
any comments or questions to the list.  Editorial nits can be sent
to the author.

If you can't wait for the I-D editor's announcement, the draft can
be found at the following URL:

http://www.innovationslab.net/~haberman/draft-ietf-malloc-ipv6-guide-03.txt

Brian


From owner-malloc@catarina.usc.edu  Thu Jun 28 09:47:03 2001
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From: Internet-Drafts@ietf.org
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Subject: I-D ACTION:draft-ietf-malloc-ipv6-guide-03.txt
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--NextPart

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Multicast-Address Allocation Working Group of the IETF.

	Title		: Dynamic Allocation Guidelines for IPv6 Multicast 
                          Addresses
	Author(s)	: B. Haberman
	Filename	: draft-ietf-malloc-ipv6-guide-03.txt
	Pages		: 6
	Date		: 27-Jun-01
	
This document specifies guidelines that must be implemented by any 
entity responsible for allocating IPv6 multicast addresses.  The 
purpose of these guidelines is to reduce the probability of IPv6 
multicast address collision, not only at the IPv6 layer, but also at 
the MAC layer of media that utilizes IEEE 802 addressing.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-malloc-ipv6-guide-03.txt

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