[dns-operations] Retrying with TCP on timeout?

Stephane Bortzmeyer bortzmeyer at nic.fr
Fri Apr 20 10:51:03 UTC 2018

DNS resolvers retry with TCP when they receive a response with the TC
(truncated) bit. But when the authoritative name servers timeout?

Use case: the two authoritative name servers for .pf no longer reply
over UDP, only TCP. Apparently, no resolver (I tried several, plus
the RIPE Atlas probes) retry with TCP.

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