Network Troublshooting > General Networking Support in Linux

Port forwarding with iptables?

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MiG-15:
i want to forward, for example port 82, to 192.168.1.20 behind my router when it receives the port request from my outside ip....  any help on the rule. i tried PREROUTING in the nat table, but it didnt work, maybe i did it wrong...

Ricky:
Have enabled the following??


--- Code: ---echo 1 > /proc/sys/net/ipv4/ip_forward
--- End code ---

MiG-15:
yup, i have all the forwarding and masquerading working fine, i have a cable modem shared to my lan, but i want to forward ports to certain computers in my lan

jayakrishnan:
[code]#!/bin/bash

echo 1 >/proc/sys/net/ipv4/ip_forward

iptables -t nat -A POSTROUTING -s 192.168.0.0/255.255.255.0 -d 192.168.0.0/255.255.255.0 -j ACCEPT

iptables -t nat -A POSTROUTING -s 202.88.186.76/255.255.255.0  -j ACCEPT

iptables -t nat -A POSTROUTING -s 192.168.0.0/255.255.255.0 -o eth0  -j SNAT    --to-source 202.88.186.76



This may help. this is what i use on my gateway server

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