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Re: [v6ops] IPv6 EHs Packet Drops (Fwd: New Version Notification for draft-gont-v6ops-ipv6-ehs-packet-drops-02.txt)

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 12 February 2016 00:07 UTC

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To: Tom Herbert <tom@herbertland.com>
References: <20160204214639.14168.48254.idtracker@ietfa.amsl.com> <56B4F1A6.7080402@foobar.org> <CAO42Z2yG_85ASJKbgMwXBzAAT41_DTsgYTpHm4ZtiPyjL0ZeVQ@mail.gmail.com> <56B668C3.8090009@foobar.org> <CAO42Z2zfXymKK_jPUXnV+e-6-BxJBvui2EOi7XAdo-5o5vj2ag@mail.gmail.com> <56B67671.3010409@foobar.org> <CAO42Z2zXd17fNsArj-JFGNo+s7PtiwLKLaWPkkcHiEHybO49Fw@mail.gmail.com> <56B742AC.7010307@foobar.org> <CAO42Z2wQHftEMQUPPfjvz3d+j_5ag0hV0cP1FcufGDk27WbqNg@mail.gmail.com> <56B7B919.8090001@foobar.org> <56B83BB9.7040704@isi.edu> <56B8BA32.3010505@foobar.org> <56B8F12F.30307@isi.edu> <56B90B6C.9060105@si6networks.com> <56B90E16.1090402@gmail.com> <56B933A4.6060405@si6networks.com> <B9EACBEF-0C11-4BC9-BDC4-FC720EA38985@employees.org> <74B4E9A1-E6FE-40C0-9EC9-0C2C5172A246@employees.org> <6E0AE4AB-330D-4670-9EF0-21F8E43AC6CB@employees.org> <4044B8C3-844A-40E7-A98E-D26961FADD39@employees.org> <56BBE231.9030706@gmail.com> <CALx6S36+5GBfhshcQ3fWFp+E6kXQJ6VLX8cFrHAkUVrRK9J7+Q@mail.gmail.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Fri, 12 Feb 2016 13:07:43 +1300
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Cc: IPv6 Operations <v6ops@ietf.org>
Subject: Re: [v6ops] IPv6 EHs Packet Drops (Fwd: New Version Notification for draft-gont-v6ops-ipv6-ehs-packet-drops-02.txt)
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On 11/02/2016 22:57, Tom Herbert wrote:
...
> Suppose we define an "EH chain length" extension header. This would
> include the length of the chain starting from the first byte of the EH
> and also a next header value for the header that follow the chain.
> This EH could follow HBP. Network nodes can use this to skip over a
> long chain to parse the transport header. The receiver would need to
> validate the length and protocol are correct in order to prevent
> someone from spoofing transport headers.

https://tools.ietf.org/html/draft-zhang-6man-offset-option-01

But it doesn't help, because any middlebox that insists on trying
to parse all the headers will not make use of this feature.

   Brian

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