Re: [tsvwg] UDP-Options: UDP has two ???maximums???

Joseph Touch <touch@strayalpha.com> Sat, 03 April 2021 23:07 UTC

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From: Joseph Touch <touch@strayalpha.com>
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Date: Sat, 3 Apr 2021 16:07:22 -0700
Cc: Gorry Fairhurst <gorry@erg.abdn.ac.uk>, "tsvwg@ietf.org" <tsvwg@ietf.org>
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To: Paul Vixie <paul@redbarn.org>
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Subject: Re: [tsvwg] UDP-Options: UDP has two ???maximums???
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> On Apr 3, 2021, at 1:23 PM, Paul Vixie <paul@redbarn.org> wrote:
> 
> PLPMTUD is exactly what i wanted for DNS over UDP, and we refer to it here:
> 
> https://www.ietf.org/archive/id/draft-ietf-dnsop-avoid-fragmentation-04.txt <https://www.ietf.org/archive/id/draft-ietf-dnsop-avoid-fragmentation-04.txt>
> 
> note, a lot of others expect DNS to move to HTTP/3 or TCP, but even in
> those cases i would like to use the largest discrete PDUs that will fit.

You might take a closer look at UDP options:
https://tools.ietf.org/html/draft-ietf-tsvwg-udp-options-09

It supports UDP-layer fragmentation and reassembly with a 32-bit ID field.

Joe