ping6 www.freebsd.org hangs

[Pierre Dupond]

Hi All,
      Sometime when I try to pass the command
"ping6 www.freebsd.org" or "ping6 www.google.org" on 12.0-RELEASE-p7
 the ping hangs. But after a moment (perhaps 5 minutes),
if the command is tried again it works.

If I do the same command at the same time from some other machines
(FreeBSD 8, many different Linux) the command succeeds
without problems.

Normally the routers inside the network let pass the ICMP
traffic about packet size problem.

Do you have an idea what could happens?

Thanks
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