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Re: [tsvwg] UDP Options Implementation Update

Tom Herbert <tom@herbertland.com> Mon, 05 November 2018 15:24 UTC

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From: Tom Herbert <tom@herbertland.com>
Date: Mon, 05 Nov 2018 07:24:17 -0800
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To: Derek Fawcus <dfawcus+lists-tsvwg@employees.org>
Cc: G Fairhurst <gorry@erg.abdn.ac.uk>, tsvwg <tsvwg@ietf.org>, Joe Touch <touch@strayalpha.com>
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Subject: Re: [tsvwg] UDP Options Implementation Update
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On Mon, Nov 5, 2018 at 4:22 AM, Derek Fawcus
<dfawcus+lists-tsvwg@employees.org> wrote:
> On Mon, Nov 05, 2018 at 06:33:00AM +0000, tom@erg.abdn.ac.uk wrote:
>>
>> At IETF-103 we are presenting the CCO
>> (draft-fairhurst-udp-options-cco, see maprg and tsvwg second meeting).
>> We think use of the CCO is required on the internet and an checksum
>> using the CCO pseudo header should replace the OCS.
>>
>>  xx      4         Checksum Compensation Option (CCO)    - An alternative approach to OCS
>
> Oh - I like that.
>
> Have you actually observed any middlebox corruption or mis-checking along the lines mentioned?
>

That should be explicitly tested by sourcing bad packets. I believe
that a single bit flip in the option type of a OCS will not be
detected as an error.

Tom

> If so, then it would seem this new option would be mandatory to include in
> all UDP packets containing UDP options.
>
> DF
>

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