Hi.

I have 2 computers, i run fedora core 3 on my main and winxp on the secondary.
the main has 2 NICs 192.168.0.1 for my LAN connection at home and 10.0.0.1 which connects to a router (10.0.0.138).
I want to get the secondary connected to the internet through the primary but when i try to ping the router NIC (10.0.0.138) from the secondary (192.168.0.100) it just wont ping it though it manages to ping the 10.0.0.1.
The router does allow ICMP because i can ping it from 10.0.0.1.
It confuses me because they are the same network and i see no reason why 192.168.0.100 can reach 10.0.0.1 but not 10.0.0.138.

What should i add to the routing table for this configuration to work?

Thanks.

Do you have NAT operating on the 10.0.0.1 interface..

If not, the router doesn't know where to send the replies..
It would use the gateway it is programmed with to find the non-local 192.168.0.0 network..

Oh.. how do i install NAT on this interface?

NAT is part of the netfilter system, operated by iptables..

If you have SNAT (or MASQUERADE) operating on the 10.0.0.1 interface, any 192.168.0.x numbers get changed to 10.0.0.1.
The router can find 10.0.0.1 but doesn't know where 192.168.0.x is..
When the the packets return from the router, they are changed back to the original 192.168.0.x number.

This tutorial can help..