RE: 6MAN WG Last Call:draft-ietf-6man-ipv6-subnet-model-00.txt

"Wojciech Dec (wdec)" <wdec@cisco.com> Thu, 26 June 2008 14:05 UTC

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Subject: RE: 6MAN WG Last Call:draft-ietf-6man-ipv6-subnet-model-00.txt
Date: Thu, 26 Jun 2008 16:05:21 +0200
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Thread-Topic: 6MAN WG Last Call:draft-ietf-6man-ipv6-subnet-model-00.txt
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From: "Wojciech Dec (wdec)" <wdec@cisco.com>
To: "Brian Haberman" <brian@innovationslab.net>, <ipv6@ietf.org>
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Cc: MILES DAVID <David.Miles@alcatel-lucent.com.au>, Bob Hinden <bob.hinden@nokia.com>
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Based on a recent thread
(http://www.ops.ietf.org/lists/v6ops/v6ops.2008/msg00896.html) the
following paragraph from the draft appears to warrant some more thought
if not outright a revision

"   In addition to the Prefix List, individual addresses are on-link if
   they are the target of a Redirect Message indicating on-link, or the
   source of a valid Neighbor Solicitation or Neighbor Advertisement
   message.  Note that Redirect Messages can also indicate an address is
   off-link.  Individual address entries can be expired by the Neighbor
   Unreachability Detection mechanism."

Using unconditionally the source address of a neighbour solicitation or
NA to determine on-link would indeed appear to be undesirable, unless
the intent is allow some direct host-host cross subnet/prefix
communication without a router involved at any stage (this is not a good
idea IMO). A constraint could be introduced such as: A host only learns
on-link addresses from the source of NS and NA messages iff it already
has an on-link prefix that would cover that address. Learning from
Redirect messages would continue to be allowed.

My 2c.
-Woj.
 

> -----Original Message-----
> From: ipv6-bounces@ietf.org [mailto:ipv6-bounces@ietf.org] On 
> Behalf Of Brian Haberman
> Sent: 26 June 2008 14:17
> To: ipv6@ietf.org
> Cc: Bob Hinden
> Subject: 6MAN WG Last Call:draft-ietf-6man-ipv6-subnet-model-00.txt
> 
> All,
>       This message starts a 3-week 6MAN Working Group Last Call on
> advancing:
> 
>       Title     : IPv6 Subnet Model: the Relationship between
>                   Links and Subnet Prefixes
>       Author(s) : H. Singh, et al.
>       Filename  : draft-ietf-6man-ipv6-subnet-model-00.txt
>       Pages     : 8
>       Date      : 2008-05-08
> 
> as a Proposed Standard.  Substantive comments and statements 
> of support for advancing this document should be directed to 
> the mailing list. 
> Editorial suggestions can be sent to the document editor.  
> This last call will end on July 10, 2008.
> 
> Regards,
> Brian & Bob
> 6MAN co-chairs
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