Error while writing to Generic BSD tap device /dev/tinc0

[mjh]

Hey everybody, first and foremost fantastic smooth migration I've been waiting for to get some development done.

One of the things that I'm doing is building my own version of the dn42 network: https://wiki.dn42.us/Home

Where I am presently, is building layer 2 with tinc. I'm using the Plugin and GUI and switch mode. I can ICMP/ping and tcp/ssh around to the other nodes, but the OPNsense nodes give this error:

Error while writing to Generic BSD tap device /dev/tinc0: Address family not supported by protocol family

I've added very permissive rules allowing any and allowing specific protocols between the Interface and Gateway networks but nothing seems to be helping. Any troubleshooting recommendations? Let me know what info you need from me, aside from the tap vs. tun interface this is a pretty standard tinc configuration.

Cheers,
M.