Friday, December 30, 2022

"/bsd: cannot forward" ip6 traffic messages

I'm seeing messages like these frequently in /var/log/messages:

/bsd: cannot forward from fd58:6af3:2ff6:aa:895:e4a:8bf9:5759 to
fd58:6af3:2ff6:c8:97:5360:bd73:6a88 nxt 17 received on interface 9

The two hosts are on separate networks (one is the lan, the other a
vlan). I've tracked it down to traffic on udp port 3722 between
Apple devices; the messages stop if I block traffic on that port.
When unblocked, I can see the traffic is passed successfully by using
tcpdump on both vlans. Maybe some packets are occsionally dropped?

I'm wondering if anyone knows why this message is logged, and if there
is anything I can tune with sysctl or pf to prevent it. I'm on 7.2
with the latest patches.

Thanks,
Brian

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