What you see in ifconfig? I have line like that: ifconfig pair1 pair1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,\ MULTICAST> rdomain 1 mtu 1500
and the content of config file for interface: cat /etc/hostname.pair1 inet 172.10.0.1 255.255.255.0 172.10.0.255 rdomain 1 and probably less importantly: sysctl net.inet.ip.forwarding net.inet6.ip6.forwarding
