On 22/10/2023 13.18, Mirja Kühlewind
via Datatracker wrote:
3) In R8 you mention a timeout. Is it already anywhere specified how to set such a time for DNS retransmissions? If so, I think a reference would be useful. If not, more guidance is need to avoid network overload.
No, I don't think so.
Retransmissions tend to become complex alchemy, exactly because too many things could go wrong with the request, and different remedies work well for different causes. I believe this was among the motivations in both of https://www.dnsflagday.net occurrences (EDNS handling and default UDP size limits), so it's at least somewhat better recently - but as a resolver vendor I don't consider these parameters suitable for tinkering by users. (though some other vendors/people surely might have a different opinion)
--Vladimir | knot-resolver.cz
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