I don't think a MUST would be totally inappropriate but it's possible to
get into a state where you have a mismatch due to DNS latency or partial
rollback, so this MUST will be violated in practice in some cases (though
as you indicate, that's not good). ECH has a way to recover from these
conditions,

-Ekr


On Wed, Oct 23, 2024 at 9:45 AM Barry Leiba via Datatracker <
nore...@ietf.org> wrote:

> Reviewer: Barry Leiba
> Review result: Ready with Nits
>
> Just two small comments on this straightforward document:
>
> — Section 3 —
>
>  Figure 1: ECH SvcParam with a public_name of "ech-sites.example.com"
>
> The example actually encodes example.net, not example.com
> [This was a test to see if we check these things, right? :-) ]
>
> — Section 4 —
>
>    These servers SHOULD support a protocol version that is compatible
>    with ECH.
>
> Why is this not a MUST?  What might be a reason to publish an ECH record
> for a
> server that doesn’t support ECH?
>
>
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