HOw do I Port Forward when using Linux ???

I was just wondering how to port forward using Linux as a router.. I'm trying to use Azureus and I keep on getting a NAT Error .. so if anyone can help me with this it would be greatly appreciated.

 

Some more info would be handy...
What Linux distribution are you using?
What application are you using to do manage your connection?
How experienced are you in using linux?

 

I have a Linux machine acting as a router for me, using iptables. Coincidentally, I started using Azureus last week. To pass the Azureus required port 6881 from my Linux router to my Linux desktop (192.168.0.2) I used the following bash script:

#!/bin/sh

export ETH=`ifconfig eth0 | awk '{print $2}' | grep addr | cut -b 6-`
export PORT="6881"

for j in ${PORT}
do
iptables -t nat -I POSTROUTING -s 192.168.0.2 -p udp \
--dport $j -j SNAT --to-source ${ETH}:$j
iptables -t nat -I POSTROUTING -s 192.168.0.2 -p udp \
--sport $j -j SNAT --to-source ${ETH}:$j

iptables -t nat -I PREROUTING -p udp -d ${ETH} --dport $j \
-j DNAT --to-destination 192.168.0.2

iptables -t nat -I POSTROUTING -s 192.168.0.2 -p tcp \
--dport $j -j SNAT --to-source ${ETH}:$j
iptables -t nat -I POSTROUTING -s 192.168.0.2 -p tcp \
--sport $j -j SNAT --to-source ${ETH}:$j

iptables -t nat -I PREROUTING -p tcp -d ${ETH} --dport $j \
-j DNAT --to-destination 192.168.0.2
done

To tell the truth, I'm not 100% the UDP port needs to be passed, but I thought I read that when Azureus first reported NAT problems.

I hope that helps.

 

ya thnx man It helped a lot I tried It and It worked.. Thnx man P