PREROUTING

[netfilter_user <netfilter_user@o2.pl>]

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@o2.pl