ipfw add 9 allow tcp from me to me
ipfw add 10 allow tcp from x.x.x.0/24 to me
ipfw add 12 allow udp from me to any 53 keep-state #allow DNS
ipfw add 13 allow tcp from me to any keep-state
ipfw add 14 allow udp from me to any keep-state
ipfw add 100 deny all from any to me