Multiple NIC set up

[Lee]

This is a general networking question that's probably trivial to those who know what they're doing but its turning into a real time sink for me:

I have a PC with two NICs as eth0 and eth1.

I want to be able to network with my office LAN (IP addresses 10.0.X.X) on eth1 and a DSL router at 192.168.0.1 on eth0.  Internet traffic has to go through the DSL router and not through the LAN firewall at 10.0.2.1 as a large part of the project here is to test access to internal and DMZ hosts from an "external" host.

I do not need to route traffic from other hosts to the DSL router - I just need internet traffic originating on this host to go out on the DSL line and to be able to ssh to it from either side.

I have complete freedom in configuring the TC host as far as assigning static IPs or using DHCP.

The DSL gateway at 192.168.0.1 acts a a caching DNS server as does the gateway/firewall at 10.0.2.1.

I'm thinking a couple of "ifconfig"s and "route add" or two will do the job, but I have yet to get both interfaces working at the same time.

Can anyone help me with this?

[curaga]

Set eth0 as default route, done. Using static IPs would probably be best for a more complex setup like this.

edit: Start with everything down, no dhcp.

ifconfig eth0 blabla up
ifconfig eth1 blabla up
route add default gw 192.168.0.1 dev eth0

[Lee]

Thanks curaga!

I'm hoping to get some time to tinker with it today, but it already is working better than any of my previous attempts.