Hello everyone, this is my problem: My LAN is connected to Internet via Linux machine with 2 interface ( ppp0 - for internet and eth1 for local net). I need to connect from local host, service that is running on port 23073 and 23083 UDP in internet. For this i wrote afew rules with PREROUTING but when I start script with rules below i receive: Bad argument `PREROUTING' Try `iptables -h' or 'iptables --help' for more information. Bad argument `PREROUTING' Try `iptables -h' or 'iptables --help' for more information. iptables -t nat -A PREROUTING -p udp -d 80.50.60.185 --dport 23073 -j DNAT --to-destination 192.168.1.2 iptables -t nat -A PREROUTING -p udp -d 80.50.60.185 --dport 23083 -j DNAT --to-destination 192.168.1.2 iptables -A FORWARD -p udp -d 192.168.1.2 --dport 23073 -j ACCEPT iptables -A FORWARD -p udp -d 192.168.1.2 --dport 23083 -j ACCEPT What maybe a reason of this msg? Im using slackware 8.1 with iptables 1.2.6a -- Best regards, mailto:netfilter_user@xxxxx