$IPTABLES -A FORWARD -p tcp --dport 1224 -j ACCEPT
$IPTABLES -t nat -I PREROUTING -p tcp -i $EXTIF --dport 1224 -j DNAT --to 192.168.0.2:1224
$IPTABLES -A FORWARD -p udp --dport 1224 -j ACCEPT
$IPTABLES -t nat -I PREROUTING -p udp -i $EXTIF --dport 1224 -j DNAT --to 192.168.0.2:1224