> I don't 100% agree. In the case that PMTUD is broken, there'd be
> nothing to stop a current DNSSEC implementation from always assuming a
> default path MTU of 1280, without awaiting confirmation from PMTUD, and
> fragmenting the UDP packet pre-emptively [assuming fragmentation was
> not equally broken along the path as ICMP PTB was].
>
Do any implementations actually do this?
If they do, how well are they working, today?
Ron
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