Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop
Brian E Carpenter <brian.e.carpenter@gmail.com> Wed, 07 November 2012 15:00 UTC
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Date: Wed, 07 Nov 2012 15:00:10 +0000
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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To: Brian E Carpenter <brian.e.carpenter@gmail.com>
References: <CAKD1Yr13cNspdWvTaXxHt4R_8UB-CKeA4nq8_XWrkbFGCgW7Gg@mail.gmail.com> <5090DECF.3050100@gmail.com> <CAKD1Yr1dUy-f78A2+kfA7NjpzD0WQRT8iwqGYAm5A=Erodpn-A@mail.gmail.com> <20121031.122110.41655699.sthaug@nethelp.no> <50910E41.2030100@gmail.com> <CAKD1Yr0mTTcVeq+Qf0fLv3UCBP_90QmStkK3Ha4tDdm3FxJjVA@mail.gmail.com> <50915F86.7050304@gmail.com> <509165B8.404@si6networks.com> <509169C2.9040208@isi.edu> <50916F21.6030303@si6networks.com> <509174F1.8080809@isi.edu> <50924264.7040300@gmail.com> <5092C0BA.4090000@isi.edu> <5092C846.5090009@gmail.com>
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Cc: Fernando Gont <fgont@si6networks.com>, v6ops@ietf.org
Subject: Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop
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On 01/11/2012 19:06, Brian E Carpenter wrote: > Joe, > > On 01/11/2012 18:34, Joe Touch wrote: >> >> On 11/1/2012 2:35 AM, Brian E Carpenter wrote: >>> On 31/10/2012 18:58, Joe Touch wrote: >>>> >>>> On 10/31/2012 11:34 AM, Fernando Gont wrote: >>>>> On 10/31/2012 04:11 PM, Joe Touch wrote: >>>>>> Yes, but the whole point of the IPv6 option architecture was to avoid >>>>>> the issues seen with IPv4 options. >>>>> The only thing in that IPv6 would avoid is requiring routers to parse >>>>> *all* options, just to find the ones that need to be processed by >>>>> routers. >>>> Yes. >>> No. The only extension header that *needs* to be parsed by intermediate >>> routers is the hop-by-hop options header, and that is the first one (if >>> present). >> The first one could be: >> >> A. a known HBH option >> indicating there are HBH options >> B. a known E2E option >> indicating there are no HBH options >> C. an unknown option or a pad option >> indicating NOTHING > > Actually there is another unfortunate aspect of RFC 2460 here. It would > be better if it said that the hbh options extension header MUST be > first, instead of just recommending it. I think I will add that to my draft. I was wrong. 2460 does have this as a lower case "must". Brian > >> In the case of C, the router needs to keep looking at subsequent options >> until one of three things happens: >> >> 1. a known HBH option is seen >> indicating there are HBH options >> 2. a known E2E option is seen >> indicating there are no HBH options >> 3. there are no more options >> indicating there are no HBH options >> >> As a result, it's entirely possible that a router could need to parse >> the entire option chain before it can determine whether there are any >> HBH options. > > Yes, because of the point I just mentioned. That's a bug IMHO. > However, the observed problems come from middleboxes that don't > parse regular extension headers, not hbh option headers. > > Brian > >>> (You can legitimately argue that the hbh header and the routing header >>> are effectively useless, but that doesn't break fundamental >>> connectivity.) >>> >>> IPv6 routers should have nothing to do with fragmentation. >> +1 >> >>> The problem is due to middleboxes that break the IPv6 spec by inspecting >>> any part of the packet beyond the hop-by-hop header and discarding what >>> they don't understand. >> +1 >> >> Joe >> >
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- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Nick Hilliard
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Nick Hilliard
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop David Farmer
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Nick Hilliard
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop james woodyatt
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Nick Hilliard
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Nick Hilliard
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Warren Kumari
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop C. M. Heard
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Nick Hilliard
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Nick Hilliard
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop joel jaeggli
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop joel jaeggli
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Brian E Carpenter
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Warren Kumari
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Warren Kumari
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Mark Andrews
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Nick Hilliard
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Tom Taylor
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Warren Kumari
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop C. M. Heard
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Nick Hilliard
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Mikael Abrahamsson
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop joel jaeggli
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop joel jaeggli
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Fernando Gont
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Fernando Gont
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Fernando Gont
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- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Fred Baker (fred)
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Merike Kaeo
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Mark Smith
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- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Brian E Carpenter
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Mark Andrews
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Andrew Yourtchenko
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Andrew Yourtchenko
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Mark Andrews
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop sthaug
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Fernando Gont
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Lorenzo Colitti
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Fernando Gont
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop KK Chittimaneni
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Mark Smith
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Lorenzo Colitti
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Brian E Carpenter
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Brian E Carpenter
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Lorenzo Colitti
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Brian E Carpenter
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Tim Chown
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Lorenzo Colitti
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Brian E Carpenter
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Mark Smith
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Mark Smith
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Lorenzo Colitti
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Brian E Carpenter
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Lorenzo Colitti
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- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Randy Bush
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Nick Hilliard
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- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Lorenzo Colitti
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Havard Eidnes
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Brian E Carpenter
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Fernando Gont
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Fernando Gont
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Fernando Gont
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
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- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Fred Baker (fred)
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Lorenzo Colitti
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- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Brian E Carpenter
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Brian E Carpenter
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop joel jaeggli
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Fernando Gont
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Fernando Gont
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Fernando Gont
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop sthaug
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Templin, Fred L
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joel Jaeggli
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Brian E Carpenter
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop joel jaeggli
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Brian E Carpenter
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop joel jaeggli
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Randy Bush
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Brian E Carpenter
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Randy Bush
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Mark Andrews
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Brian E Carpenter
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Brian E Carpenter
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Ole Trøan
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Bob Hinden
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Joe Touch