Re: Last Call: <draft-ietf-6man-rfc4291bis-07.txt> (IP Version 6 Addressing Architecture) to Internet Standard

David Farmer <farmer@umn.edu> Mon, 13 February 2017 22:32 UTC

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From: David Farmer <farmer@umn.edu>
Date: Mon, 13 Feb 2017 16:32:27 -0600
Message-ID: <CAN-Dau0kDiSNXsyq9-xEdS5mzLt-K+MYHqoV8aC8jDVREw8OPQ@mail.gmail.com>
Subject: Re: Last Call: <draft-ietf-6man-rfc4291bis-07.txt> (IP Version 6 Addressing Architecture) to Internet Standard
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Cc: 6man WG <ipv6@ietf.org>, draft-ietf-6man-rfc4291bis@ietf.org, Suresh Krishnan <suresh.krishnan@ericsson.com>, IETF-Announce <ietf-announce@ietf.org>, 6man-chairs@ietf.org
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I have concerns with the following text;

   IPv6 unicast routing is based on prefixes of any valid length up to
   128 [BCP198].  For example, [RFC6164] standardises 127 bit prefixes
   on inter-router point-to-point links. However, the Interface ID of
   all unicast addresses, except those that start with the binary value
   000, is required to be 64 bits long.  The rationale for the 64 bit
   boundary in IPv6 addresses can be found in [RFC7421]

The third sentence seems to limit exceptions to 64 bit IIDs to exclusively
addresses that start with binary vale of 000.  There are at least two other
exceptions from standards track RFCs, that should be more clear accounted
for in this text.  First is [RFC6164] point-to-point links, as mentioned in
the previous sentence.  I think the clear intent of [RFC6164] is to allow
one(1) Bit IIDs for point to point-to-point links using any Global Unicast
Address, not just those that start with 000.  Second is, [RFC6052], which
updates [RFC4921] and seems to allow 32 bit IIDs or /96 prefixes for any
Global Unicast Address when used for IPv4/IPv6 translation, referred to as
""Network-Specific Prefix" unique to the organization deploying the address
translators," in section 2.2 of [RFC6052].

Thanks.

On Wed, Feb 1, 2017 at 5:51 PM, The IESG <iesg-secretary@ietf.org>; wrote:

>
> The IESG has received a request from the IPv6 Maintenance WG (6man) to
> consider the following document:
> - 'IP Version 6 Addressing Architecture'
>   <draft-ietf-6man-rfc4291bis-07.txt> as Internet Standard
>
> The IESG plans to make a decision in the next few weeks, and solicits
> final comments on this action. Please send substantive comments to the
> ietf@ietf.org mailing lists by 2017-03-01. Exceptionally, comments may be
> sent to iesg@ietf.org instead. In either case, please retain the
> beginning of the Subject line to allow automated sorting.
>
> Abstract
>
>
>    This specification defines the addressing architecture of the IP
>    Version 6 (IPv6) protocol.  The document includes the IPv6 addressing
>    model, text representations of IPv6 addresses, definition of IPv6
>    unicast addresses, anycast addresses, and multicast addresses, and an
>    IPv6 node's required addresses.
>
>    This document obsoletes RFC 4291, "IP Version 6 Addressing
>    Architecture".
>
>
>
>
> The file can be obtained via
> https://datatracker.ietf.org/doc/draft-ietf-6man-rfc4291bis/
>
> IESG discussion can be tracked via
> https://datatracker.ietf.org/doc/draft-ietf-6man-rfc4291bis/ballot/
>
>
> No IPR declarations have been submitted directly on this I-D.
>
>
>
>
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> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> --------------------------------------------------------------------
>



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