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[v6ops] Re: [DNSOP] Re: Fwd: New Version Notification - draft-ietf-dnsop-avoid-fragmentation-18.txt

Nick Hilliard <nick@foobar.org> Fri, 05 July 2024 10:51 UTC

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To: Philip Homburg <pch-v6ops-13@u-1.phicoh.com>
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From: Nick Hilliard <nick@foobar.org>
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Date: Fri, 05 Jul 2024 11:50:58 +0100
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Subject: [v6ops] Re: [DNSOP] Re: Fwd: New Version Notification - draft-ietf-dnsop-avoid-fragmentation-18.txt
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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.

Nick

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