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Re: [tsvwg] UDP Options Implementation Update

Joe Touch <touch@strayalpha.com> Mon, 05 November 2018 16:00 UTC

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From: Joe Touch <touch@strayalpha.com>
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Date: Mon, 05 Nov 2018 08:00:47 -0800
Cc: 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> <D545954C-8C2C-4138-A72B-6197C849B120@strayalpha.com>
To: Tom Herbert <tom@herbertland.com>
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Subject: Re: [tsvwg] UDP Options Implementation Update
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FWIW, before everyone jumps in, ACS is for the UDP payload not the options.
We don’t really have a ‘strong’ checksum for the header itself, but that’s no different from IP (which uses a weak checksum) and especially IPv6 (which uses no checksum at all).

There’s simply no reason that UDP should be stronger than IP in this regard. 

Joe

> On Nov 5, 2018, at 7:51 AM, Joe Touch <touch@strayalpha.com> wrote:
> 
> 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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