Two-way NAT routing
 

Hello,

I have network like that:


(CLIENT1) (CLIENT2)

((( MY ROUTER)))

(Gateway-192.168.0.1) (Gateway-192.168.0.2)



Client 1 and 2 now is using an internet connection with iptables NAT from gateway-1. But the main idea is to make some ports (ex.6667) from client1 to be forwarded to gateway2's internet connection.

How I can do that?

Depends... Are you saying that your router is the gateway with both IP addresses bound to a single or multiple interfaces, or are you saying that your router is a separate entity from the two gateways?

If your router is the gateway with two IP addresses you can use "iptables -j SNAT" to define what traffic leaves what IP.

If your router sends traffic to one of two external gateways you are looking at policy routing.

The gateways is another computers on another interfaces

This means you will need to do policy routing. I recommend using the firewall mark in iptables and routing packets based on this mark.

Here is a good reference site: http://www.compendium.com.ar/policy-routing.txt

Section 6 talks about the fwmark method.

Another good resource I found on Google: http://www.monkeynoodle.org/comp/net...ing-HOWTO.html

Hope this helps :)