Subject: FreeBSD/OSPF: ospf1: Socket error on wg0: Network is unreachable

[adam at adammccarthy.co.uk]

Hello,

I run OSPFv2 between multiple Linux hosts over wireguard tunnels between 
them in a full mesh. This works fine in Ubuntu Linux 20.04, but if I try 
to add a FreeBSD 12.2-RELEASE-p1 host, I receive the following error:

bird[9767]: ospf1: Socket error on wg-lon1: Network is unreachable

Could this be related to changes in FreeBSD 12, like FreeBSD 11 e.g., 
https://github.com/BIRD/bird/pull/1?

Thanks for any advice you can give me.

Best,
Adam

BIRD and Wireguard are built from FreeBSD ports.

$ bird --version
BIRD version 2.0.7

$ wg --version
wireguard-tools v1.0.20200827 - https://git.zx2c4.com/wireguard-tools/

$ uname -a
FreeBSD <hostname> 12.2-RELEASE-p1 FreeBSD 12.2-RELEASE-p1 GENERIC  
amd64

wg0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1420
     options=80000<LINKSTATE>
     inet 10.1.5.5 --> 10.1.5.5 netmask 0xfffffff8
     groups: tun
     nd6 options=101<PERFORMNUD,NO_DAD>
     Opened by PID 9459

$ netstat -rn
[...]
10.1.5.1           wg-lon1            UHS     wg-lon1
10.1.5.5           link#5             UH      wg-lon1
[...]

$ cat /etc/bird/bird.conf
[...]
protocol ospf {
     ipv4{
         import all;
         export all;
     };

     graceful restart on;

     area 0 {
         interface "wg0" {
             type nbma;
             authentication none;
             neighbors {
                 10.1.5.1 eligible;
             };
         };
     };
}
[...]