Re: Review of draft-ietf-6man-rfc4291bis-06
Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 13 January 2017 19:58 UTC
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Subject: Re: Review of draft-ietf-6man-rfc4291bis-06
To: Fernando Gont <fgont@si6networks.com>, 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> <18e6e13c-e605-48ff-4906-2d5531624d64@gmail.com> <513edeeb-1713-13c5-3e44-97d79f19da6f@si6networks.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
Message-ID: <23b17a55-35e1-cf1d-3ab7-dba6bf7390e3@gmail.com>
Date: Sat, 14 Jan 2017 08:58:15 +1300
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Cc: Bob Hinden <bob.hinden@gmail.com>, IETF <ietf@ietf.org>, IPv6 List <ipv6@ietf.org>, draft-ietf-6man-rfc4291bis.all@ietf.org, int-dir@ietf.org
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Regards Brian Carpenter On 14/01/2017 08:44, Fernando Gont wrote: > On 01/12/2017 10:55 PM, Brian E Carpenter wrote: >> 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.) > > Well, yes and no. With the traditional slaac (embed the mac address) it > only works with 64-bit IIDs. With something like RFC7217 (grab as many > bits as needed to for an IID), it could work. Technically that's true, but you can't mix IID sizes on a given link and expect it to work, so any legacy system will force the whole link to use /64. 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