I see NTP packets coming from the monitoring server (2607:f238:2::11) to port
123 of my server, and my server responds, but the monitoring server is
repeatedly sending ICMP port unreachables in response to my response:
19:03:40.250572 IP6 (hlim 55, next-header ICMPv6 (58) payload length: 104)
2607:f238:2::11 > leo.asperger-marriage.info: [icmp6 sum ok] ICMP6, destination
unreachable, length 104, unreachable port, 2607:f238:2::11 udp port 17819
At least they look like port unreachable. Perhaps this is normal behaviour for
the monitoring server, i.e. all it's trying to do is to get a valid response
from the public NTP servers. I stand ready to be corrected!
--Chris Slater-Walker
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