Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop
Lorenzo Colitti <lorenzo@google.com> Thu, 01 November 2012 00:35 UTC
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References: <201210161245.q9GCj0i26478@ftpeng-update.cisco.com> <E1829B60731D1740BB7A0626B4FAF0A65E0DEDF3A2@XCH-NW-01V.nw.nos.boeing.com> <507DA6A3.20807@inex.ie> <E1829B60731D1740BB7A0626B4FAF0A65E0DEDF3C3@XCH-NW-01V.nw.nos.boeing.com> <507DAB13.2010704@inex.ie> <E1829B60731D1740BB7A0626B4FAF0A65E0DEDF3CE@XCH-NW-01V.nw.nos.boeing.com> <507DDF8A.9010607@inex.ie> <E1829B60731D1740BB7A0626B4FAF0A65E0DEDF5AB@XCH-NW-01V.nw.nos.boeing.com> <BB219517-B488-4777-AE9C-35C57BE91263@kumari.net> <E1829B60731D1740BB7A0626B4FAF0A65E0DEDF778@XCH-NW-01V.nw.nos.boeing.com> <507F265E.6030000@inex.ie> <E1829B60731D1740BB7A0626B4FAF0A65E0DF5BFAE@XCH-NW-01V.nw.nos.boeing.com> <507F32DA.30600@inex.ie> <E1829B60731D1740BB7A0626B4FAF0A65E0DF5BFC3@XCH-NW-01V.nw.nos.boeing.com> <E1829B60731D1740BB7A0626B4FAF0A65E0DF5C234@XCH-NW-01V.nw.nos.boeing.com> <8C48B86A895913448548E6D15DA7553B18E941@xmb-rcd-x09.cisco.com> <5091907E.3090206@isi.edu>
From: Lorenzo Colitti <lorenzo@google.com>
Date: Thu, 01 Nov 2012 09:35:07 +0900
Message-ID: <CAKD1Yr2nzYmH07b=FXC4wQmYjC85vc6Sp2SzCsLVc8p7o_ayrg@mail.gmail.com>
To: Joe Touch <touch@isi.edu>
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Cc: "v6ops@ietf.org" <v6ops@ietf.org>, "draft-taylor-v6ops-fragdrop@tools.ietf.org" <draft-taylor-v6ops-fragdrop@tools.ietf.org>
Subject: Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop
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On Thu, Nov 1, 2012 at 5:56 AM, Joe Touch <touch@isi.edu> wrote: > I'm wondering whether routers that drop fragments do so only when that's > the first option, or do they just drop packets with *any* options? > Routers just do what operators configure them to do. Operators who want to have their routers do things like: - Attack (e.g., SYN flood) rate-limiting - Stateless ACL processing for security purposes - QoS classification - ... and so on configure their routers to look at upper-layer headers. If the routers cannot parse the extension header chain but only look at the next header value in the IPv6 header, then the operators have a choice: 1. Give up the above functionality. 2. Drop all packets with extension headers. It's not just the fragment header, it's all extension headers. The fragment header is just the most important one. In general: I'm not an expert, but I think the situation where processing an IPv6 packet may require 8 or 10 lookups, arbitrarily spaced within a 1500-byte packet, is not easy to implement in hardware. It doesn't work on today's architectures, and I suspect supporting it might increase the cost of forwarding hardware Supporting extension header chain parsing at anything other than wire speed exposes operators to a resource exhaustion attacks where attackers can increase load on routers (e.g., force packets to be software switched) simply by sending legitimate packets with lots of extension headers. So really it's not practical to say that you can simply provision / build for partial load since "packets with lots of extension headers are rare".
- [v6ops] new draft: draft-taylor-v6ops-fragdrop fred
- 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
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Lorenzo Colitti
- 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 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
- [v6ops] ODP: new draft: draft-taylor-v6ops-fragdr… Czerwonka Michał - Hurt TP
- 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
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Havard Eidnes
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Randy Bush
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Nick Hilliard
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Randy Bush
- 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
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Mark Smith
- 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
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Ole Trøan
- 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 Philipp Kern
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Brian E Carpenter
- Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop Ole Trøan
- 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 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