Re: Review of draft-ietf-6man-rfc4291bis-06
Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 13 January 2017 01:56 UTC
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Subject: Re: Review of draft-ietf-6man-rfc4291bis-06
To: Randy Bush <randy@psg.com>
References: <148406593094.22166.2894840062954191477.idtracker@ietfa.amsl.com> <m2fukqbbwv.wl-randy@psg.com> <F6953234-3F85-4E28-9861-433ADD01A490@gmail.com> <m2wpdzhncn.wl-randy@psg.com> <82245ef2-cd34-9bd6-c04e-f262e285f983@gmail.com> <m2d1frhjfn.wl-randy@psg.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Fri, 13 Jan 2017 14:55:59 +1300
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Cc: IPv6 List <ipv6@ietf.org>, int-dir@ietf.org, Bob Hinden <bob.hinden@gmail.com>, draft-ietf-6man-rfc4291bis.all@ietf.org, IETF <ietf@ietf.org>
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On 13/01/2017 13:50, Randy Bush wrote: >> RFC7421 (which is Informational) calls out RFC 6164 (not 6141!) as an exception. >> To be precise it says: >> >> The de facto length of almost all IPv6 interface identifiers is >> therefore 64 bits. The only documented exception is in [RFC6164], >> which standardizes 127-bit prefixes for point-to-point links between >> routers, among other things, to avoid a loop condition known as the >> ping-pong problem. >> >> I would suggest adding a similar exception statement in 4291bis. > > and then next year we will go through another draft and have another > exception. just get rid of classful addressing. we went through this > in the '90s. The problem is (and why we wrote 7421) is that stuff breaks with subnet prefixes longer than 64, *except* for the point-to-point case covered by 6164. Yes, I see the problem in enshrining this but I think we face signifcant issues if we do otherwise. What we could conceivably say is that /64 is mandatory except for links where SLAAC will never be used. (SLAAC itself is designed to work with any reasonable length of IID, but again in practice it only works with /64, because we need mix-and-match capability. So although IID length is a parameter in the SLAAC design, it's a parameter whose value needs to be fixed globally.) Brian
- Review of draft-ietf-6man-rfc4291bis-06 Brian Haberman
- Re: Review of draft-ietf-6man-rfc4291bis-06 Bob Hinden
- Re: Review of draft-ietf-6man-rfc4291bis-06 Randy Bush
- Re: Review of draft-ietf-6man-rfc4291bis-06 Punana Lebo
- Re: Review of draft-ietf-6man-rfc4291bis-06 Brian Haberman
- Re: Review of draft-ietf-6man-rfc4291bis-06 Bob Hinden
- Re: Review of draft-ietf-6man-rfc4291bis-06 Bob Hinden
- Re: Review of draft-ietf-6man-rfc4291bis-06 Bob Hinden
- Re: Review of draft-ietf-6man-rfc4291bis-06 Randy Bush
- Re: Review of draft-ietf-6man-rfc4291bis-06 Brian E Carpenter
- Re: Review of draft-ietf-6man-rfc4291bis-06 David Farmer
- Re: Review of draft-ietf-6man-rfc4291bis-06 Randy Bush
- Re: Review of draft-ietf-6man-rfc4291bis-06 Randy Bush
- Re: Review of draft-ietf-6man-rfc4291bis-06 Brian E Carpenter
- Re: Review of draft-ietf-6man-rfc4291bis-06 Lorenzo Colitti
- Re: Review of draft-ietf-6man-rfc4291bis-06 heasley
- Re: Review of draft-ietf-6man-rfc4291bis-06 Suresh Krishnan
- AW: Review of draft-ietf-6man-rfc4291bis-06 Karsten Thomann
- Re: Review of draft-ietf-6man-rfc4291bis-06 Randy Bush
- Re: Review of draft-ietf-6man-rfc4291bis-06 Randy Bush
- Re: Review of draft-ietf-6man-rfc4291bis-06 sthaug
- Re: Review of draft-ietf-6man-rfc4291bis-06 Lorenzo Colitti
- Re: Review of draft-ietf-6man-rfc4291bis-06 Randy Bush
- Re: Review of draft-ietf-6man-rfc4291bis-06 Lorenzo Colitti
- Re: AW: Review of draft-ietf-6man-rfc4291bis-06 Brian E Carpenter
- Re: Review of draft-ietf-6man-rfc4291bis-06 Fernando Gont
- Re: Review of draft-ietf-6man-rfc4291bis-06 Fernando Gont
- Re: Review of draft-ietf-6man-rfc4291bis-06 Brian E Carpenter
- Re: Review of draft-ietf-6man-rfc4291bis-06 heasley
- Re: Review of draft-ietf-6man-rfc4291bis-06 Mark Smith
- Re: Review of draft-ietf-6man-rfc4291bis-06 Fernando Gont
- Re: Review of draft-ietf-6man-rfc4291bis-06 John C Klensin
- Re: Review of draft-ietf-6man-rfc4291bis-06 Brian E Carpenter
- Re: Review of draft-ietf-6man-rfc4291bis-06 David Farmer
- Re: Review of draft-ietf-6man-rfc4291bis-06 Mark Smith
- Re: Review of draft-ietf-6man-rfc4291bis-06 Brian E Carpenter
- Re: Review of draft-ietf-6man-rfc4291bis-06 Lorenzo Colitti