Re: Forward 2 networks

[Christopher Hicks <chicks () chicks net>]

On Mon, 29 Nov 2004, Rudi Starcevic wrote:

> I've been trying to figure this one out but am getting a little lost and 
> confused. I have 2 NICs:
> eth0 192.168.2.7
> eth1 192.168.3.7
> each has it's own 10/100 switch.

Good.

> On eth0, 192.168.2.7, I have a small network of PC happily using NAT 
> with a default gateway of 192.168.2.1 I'd like to forward traffic for 
> eth1, 192.168.3.7 out eth0, 192.68.2.7

Sure.

> With one NIC I'm confident but with two, or more, I'm lost. I have 
> checked out Lartc but am still unsure, perhaps I should be posting this 
> there?

This is a firewall question so it seems relevant here to me, but a 
Linux-specific forum would be fine too.

The answer:

- make sure the box with two NIC's has proper routing for itself.  Can it 
ping hosts on both networks and the Internet in general?

- enable forwarding in the kernel.  Doing something like:
        echo 1 > /proc/sys/net/ipv4/ip_forward
in your /etc/rc.d/rc.local should do it.

With that you should be able to ping the real world from a host on the 
192.168.3 network.  See if it works.

--
</chris>

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