How to debug IPv6 issues after PPPoE reconnect

[laczik]

I have a native IPv6 connection running on top of my Zen (UK) PPPoE connection. IPv6 is set up using DHCPv6. Every time PPPoE reconnects, the IPv6 link also reconnects, but most of the time gets marked as link/gateway down by dpinger. When this happens, most of the time dpinger is still running, but occasionally it crashes completely. Re/starting dpinger fixes the issue, and it seems that the IPv6 link actually comes back up OK, only dpinger does not see it.

What is the best way of debugging this problem?

Thanks, John

P.S.
This may be the same problem as the one reported in the past:
https://forum.opnsense.org/index.php?topic=13375.0
https://forum.opnsense.org/index.php?topic=13660.0

--
OPNsense 20.7.3-amd64
FreeBSD 12.1-RELEASE-p10-HBSD
LibreSSL 3.1.4

[marjohn56]

It's a known issue, but no-one has ever got to the bottom of it. Here's how I get around it.


https://forum.opnsense.org/index.php?topic=18745.msg90703#msg90703


Use the attachment on Msg #14 on that thread, follow the instructions in the thread and dpinger then gets restarted no matter what causes it to shutdown.