On 05. 07. 24 12:50, Nick Hilliard wrote:
Philip Homburg wrote on 05/07/2024 11:01:
Can we go back to reality? There is no PMTU discovery for DNS replies
over UDP that works at scale. It doesn't work, it never worked.
specifically, short of implementing end-to-end circuits, it can't work
reliably. There is no way for an endpoint to detect intermediate
topology changes between itself and another endpoint, short of heuristic
and/or post-hoc interpretation of what's going on in the data plane.
I understand why Paul Vixie does not like 1400 set in stone.
Having said that I think it's in fact _not_ set in stone because the
text says RECOMMENDED.
My interpretation is that it means "if you don't know any better use
1400", but RECOMMENDED is more concise.
--
Petr Špaček
Internet Systems Consortium
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