Ibrahim Hamouda <[email protected]> wrote:

> Assuming eth2 is 50.50.50.1, eth1 is 192.168.170.1 on one firewall, eth2 is 
> 50.50.50.2, eth1 is 192.168.171.1 on the other.
> 
> How can I make 192.168.170.0 network see 192.168.171.0 network through the 
> 50.50.50 interfaces?

That's very basic routing, and nothing to do with Shorewall. You need to add a 
route on each end :
ip route add 192.168.171.0/24 via 50.50.50.2 dev eth2
and
ip route add 192.168.170.0/24 via 50.50.50.1 dev eth2

To make this persistent, add it to your network setup. Eg, in Debian (and 
derivatives), in your /etc/network/interfaces you'd have something like :
iface eth2 inet static
  address 50.50.50.1
  netmask 255.255.255.252
  post-up ip route add 192.168.171.0/24 via 50.50.50.2 dev eth2


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