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Re: [tsvwg] UDP Options Implementation Update

Joe Touch <touch@strayalpha.com> Mon, 05 November 2018 15:51 UTC

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From: Joe Touch <touch@strayalpha.com>
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Date: Mon, 05 Nov 2018 07:51:05 -0800
Cc: Derek Fawcus <dfawcus+lists-tsvwg@employees.org>, G Fairhurst <gorry@erg.abdn.ac.uk>, tsvwg <tsvwg@ietf.org>
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References: <5BDFE320.9030802@erg.abdn.ac.uk> <20181105063300.GA14271@tom-desk.erg.abdn.ac.uk> <20181105122227.GA12854@bugle.employees.org> <CALx6S35-iVdQv7w0raC7+OM6t4HQ0c=x+Ciycz_fxD3a3t5sYA@mail.gmail.com>
To: Tom Herbert <tom@herbertland.com>
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Subject: Re: [tsvwg] UDP Options Implementation Update
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I keep repeating this, but AGAIN:
	
	OCS is NOT intended as a check against bit errors

That is the role of ACS.

Joe

> On Nov 5, 2018, at 7:24 AM, Tom Herbert <tom@herbertland.com> wrote:
> 
> 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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