BTFORWARDADDR=192.168.2.20 PORTSTART=6881 PORTEND=6999 /sbin/iptables -t nat -A PREROUTING -i ppp0 -p tcp --dport $PORTSTART:$PORTEND -j DNAT --to-destination $BTFORWARDADDR /sbin/iptables -A FORWARD -s $BTFORWARDADDR -p tcp --dport $PORTSTART:$PORTEND -j ACCEPT