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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