gistfile1.txt

root@nucklehead:~ # for i in 0 1 2; do 
ipfw add 25${i} fwd 10.10.0.2${i} ip from any to 10.100.${i}.0/24 keep-state
done
00250 fwd 10.10.0.20 ip from any to 10.100.0.0/24 keep-state :default
00251 fwd 10.10.0.21 ip from any to 10.100.1.0/24 keep-state :default
00252 fwd 10.10.0.22 ip from any to 10.100.2.0/24 keep-state :default
root@nucklehead:~ #