Take a look at http://www.tldp.org/HOWTO/Adv-Routing-HOWTO/, search for
Quote:> Hi all,
> we have two ADSL lines with dynamic ips (pppoe). i have installed four
> nics in the linux router, two for the ADSL-connection and the other for
> two differen subnets (192.168.0.x/192.168.1.x).
> What do i have to do that clients from subnet 192.168.0.x can use ADSL
> line 1 and clients from subnet 192.168.1.0 ADSL line two? is it possible?
> tia Aziz