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Re: <draft-ietf-6man-rfc4291bis-09.txt>

Brian E Carpenter <brian.e.carpenter@gmail.com> Sat, 08 July 2017 20:35 UTC

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Subject: Re: <draft-ietf-6man-rfc4291bis-09.txt>
To: ipv6@ietf.org
References: <20150804195752.5065.13523.idtracker@ietfa.amsl.com> <5AB14F48-2799-4A86-830D-E8A89CCADAAC@gmail.com> <CAN-Dau0O6hrxmWiWa7yPNDkq7Dz_m1y8wA7bYx_1wYuTpM0ruw@mail.gmail.com> <CAKD1Yr1BdJ9aj0WCqrpLbnDbxjJ0rgxWfrveZNzsbKO6NJxpyw@mail.gmail.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Sun, 09 Jul 2017 08:35:48 +1200
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On 08/07/2017 17:47, Lorenzo Colitti wrote:
> On Tue, Jul 4, 2017 at 5:22 AM, David Farmer <farmer@umn.edu> wrote:
>>
>>    Interface Identifiers are 64 bit long except if the first three bits
>>    of the address are 000, or when the addresses are manually
>>    configured, or by exceptions defined in standards track documents.
>>
>>
> I don't think we should say "by exceptions defined in standards track
> documents". Whatever document wants to allow non-64-bit prefixes should
> formally update RFC 4291. Anything else will be confusing for implementers.

We're trying to find a compromise between excessive rigidity and excessive
flexibility. I don't see any confusion in the present text: if you've read
4291bis and you come upon a standards track document specifying a value
!=64, you can use it. If you've only read RFC4291, you're out of date.

You can certainly argue that RFC6164 should have formally updated RFC4291.

    Brian

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