[dns-operations] DNSviz and G-root: EDNS issue?

Stephane Bortzmeyer bortzmeyer at nic.fr
Tue Oct 12 15:14:12 UTC 2021


DNSviz currently always flags the root with a warning "./DNSKEY (alg
8, id 14748): No response was received until the UDP payload size was
decreased, indicating that the server might be attempting to send a
payload that exceeds the path maximum transmission unit (PMTU)
size. (192.112.36.4, UDP_-_EDNS0_4096_D_KN)".

Testing G-root/192.112.36.4 with the RIPE Atlas probes, bit DO and
bufsize=4096 shows no evidence of a problem (and the answer is well
below 4096 bytes). It seems it affects only the path between G-root
and DNSviz.

Any idea?


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