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Re: [tsvwg] A review of draft-ietf-tsvwg-udp-options-12

"C. M. Heard" <heard@pobox.com> Sun, 13 June 2021 22:00 UTC

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From: "C. M. Heard" <heard@pobox.com>
Date: Sun, 13 Jun 2021 15:00:35 -0700
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To: Joseph Touch <touch@strayalpha.com>
Cc: "C. M. Heard" <heard@pobox.com>, Gorry Fairhurst <gorry@erg.abdn.ac.uk>, mohamed.boucadair@orange.com, TSVWG <tsvwg@ietf.org>
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Subject: Re: [tsvwg] A review of draft-ietf-tsvwg-udp-options-12
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Responding to just this one specific point ...

On Sun, Jun 13, 2021 at 12:55 PM Joseph Touch wrote:

> And no, I do not think we should rely on RMSS to indicate that this is
> available. Note that a receiver would have to indicate RMSS and know the
> path MTU to know how many fragments it would actually take; we don’t
> require path MTU discovery for UDP options, so that’s an undue burden.
> Besides again injecting state into UDP.
>
>
For IPv6 -- where fragmentation has the greatest issues -- we are
guaranteed a minimum MTU of 1280 bytes. A DNS server operating over IPv6
would be able to serve up a fragmented response with the right number of
1280 byte fragments (or else set the TC bit) if it received the MRSS option
in the request from the client.

Mike Heard

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