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Re: [tsvwg] UDP options and header-data split (zero copy)

Joe Touch <touch@strayalpha.com> Mon, 02 August 2021 23:15 UTC

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From: Joe Touch <touch@strayalpha.com>
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Date: Mon, 02 Aug 2021 16:15:05 -0700
Cc: Sebastian Moeller <moeller0@gmx.de>, Tom Herbert <tom@herbertland.com>, TSVWG <tsvwg@ietf.org>
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To: "C. M. Heard" <heard@pobox.com>
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Subject: Re: [tsvwg] UDP options and header-data split (zero copy)
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> On Aug 2, 2021, at 4:01 PM, C. M. Heard <heard@pobox.com> wrote:
> 
> 
>> On Mon, Aug 2, 2021 at 3:54 PM Joe Touch <touch@strayalpha.com> wrote:
> 
>> 
>> 
>>>> On Aug 2, 2021, at 3:13 PM, C. M. Heard <heard@pobox.com> wrote:
>>>> 
>>> 
>>>> On Mon, Aug 2, 2021 at 12:31 PM Joe Touch wrote:
>>> 
>>>> At a minimum, because there are options that could be used in either place, eg. OCS, AUTH, and ENCR at least.
>>> 
>>> The per-fragment OCS icovers both the fragment data and the options. Is there really a justification for a per-datagram version? I think not ... though of course opinions vary ...
>> 
>> It would be a reassembly check, if that were desired. 
> 
> We went through this discussion regarding a reassembly checksum for the data and decided NOT to have one of those that uses the same checksum algorithm as the one that covers the fragments. An extension of ACS to cover reassembled per-datagram options (or another option similar to it but covering just the options) would be a better choice, I think.

Right - thanks. 

Joe. 


> 
> Mike

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