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

Brian E Carpenter <brian.e.carpenter@gmail.com> Sat, 22 July 2017 23:55 UTC

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Subject: Re: <draft-ietf-6man-rfc4291bis-09.txt>
To: "Manfredi, Albert E" <albert.e.manfredi@boeing.com>, "ipv6@ietf.org" <ipv6@ietf.org>
References: <20150804195752.5065.13523.idtracker@ietfa.amsl.com> <5AB14F48-2799-4A86-830D-E8A89CCADAAC@gmail.com> <CAKD1Yr0Bt4hhBvtSVWrLpns4odzek3U5WJkuQoS1NGsPozW0sg@mail.gmail.com> <CAN-Dau3vVREsYc4Y6AAdDpLKsMjwH_2saS7JTn8P6fRDXRKV7Q@mail.gmail.com> <596F63F4.9010501@foobar.org> <fe7a1def-e656-c6d8-5336-ed5595331b74@gmail.com> <ed0fde09ae2a4a598c9a84eb0df659e8@XCH15-06-11.nw.nos.boeing.com> <69a7f9f2-584e-a2bc-1200-64fad8f9baf7@gmail.com> <652efa7dcb414b7ba6128bb4f93a3d7e@XCH15-06-11.nw.nos.boeing.com> <CAJE_bqfbLzfSYBBuS58CB6EWYkLLoqgGnb==v0CSScfZBFp=HQ@mail.gmail.com> <m1dYUCB-0000F6C@stereo.hq.phicoh.net> <bf2ab8d8-9070-c53f-90bd-831630021749@gmail.com> <m1dYwTM-0000FzC@stereo.hq.phicoh.net> <be9f995c-b717-e87b-3ab9-3a1faa35d770@gmail.com> <1f01821f068b42839f238dfb06cf53ad@XCH15-06-11.nw.nos.boeing.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
Message-ID: <0a87d897-05f6-0834-3eb6-a72b36e29378@gmail.com>
Date: Sun, 23 Jul 2017 11:55:06 +1200
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On 23/07/2017 11:42, Manfredi, Albert E wrote:
> -----Original Message-----
> From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Brian E Carpenter
> 
>> Here's a thought. How would it be if the contentious sentence in
>> 4291bis read, in its entirety:
>>
>> "Interface Identifiers are 64 bits long when used for Stateless
>> Address Autoconfiguration (SLAAC) [RFC4862]."
> 
> I think that is a pointless semantic complication 

Actually, by removing all the exceptions in the -09 text, I contend
it is a considerable semantic simplification.

> for no benefit other than to make non-64-bit IIDs appear to be more outcasts. 

Not at all. It sticks to the principle that an Internet Standard doesn't
change the existing protocol but clarifies the applicability of the
64 bit rule. You need to compare it with RFC4291, not with the -09 text.

If you want to *change* the rule for SLAAC IID lengths, that's outside
the scope of promoting 4291 to IS status. 

Regards,
     Brian

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