[dns-operations] DNSviz and G-root: EDNS issue?
bortzmeyer at nic.fr
Wed Oct 13 07:07:14 UTC 2021
On Tue, Oct 12, 2021 at 01:01:08PM -0400,
Matthew Pounsett <matt at conundrum.com> wrote
a message of 11 lines which said:
> > This might be a known intermittent IPv6 routing issue with DNSviz, do
> > you see this problem for v4 and/or v6 ?
> That would show up as a non-answer over IPv6, rather than an apparent
> PMTU/EDNS problem.
DNSviz (and similar tools) may wrongly diagnose a PMTU problem if
there are random losses.
1) Try with bufsize=4096. No answer, because of a random packet loss.
2) Retry with bufsize=1024. Answer received, therefore it must be a
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