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Re: [tsvwg] design assumptions - draft-ietf-udp-options

Joe Touch <touch@strayalpha.com> Wed, 17 July 2019 21:13 UTC

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From: Joe Touch <touch@strayalpha.com>
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Date: Wed, 17 Jul 2019 14:13:13 -0700
Cc: 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] design assumptions - draft-ietf-udp-options
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> On Jul 17, 2019, at 2:04 PM, C. M. Heard <heard@pobox.com> wrote:
> 
> 
> 
>> On Wed, Jul 17, 2019 at 12:16 PM Joe Touch <touch@strayalpha.com> wrote:
>> And no, doing security, integrity checks, etc., on fragments is not the same as doing it over the reassembled whole.
> 
> But that's EXACTLY how TCP works -- both TCP checksums and TCP-AO cover individual segments.
> 
> Mike Heard

TCP delivers fragments in order as soon as they’re ACKd. It can’t do much else because data is used by the app later before other segments arrive. TCP is thus a poor analogy imo.

A better one is the need for file transfer checks using sha or md5 - exactly because it’s lacking in TCP.  There was a proposal to add this to ftp a few years ago fwiw (search for fro hash)

Joe

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