Hello. I would like to use a linux box as a firewall between my gateway and my webserver. This is how I would like it to look

internet---router/gateway/dhcp-----switch-----linux firewall-----webserver

It is setup like this now...

internet---router/gateway/dhcp-----switch-----webserver

I would like to start tinkering with the iptables for a firewall, but before I do I would like to make sure Linux can act as a go between for the webserver and the internet.

The Linux box is RH8 and has two nics. When I boot it up it gets the dhcp fine for itself. When I plug the second nic into a test machine I dont get connectivity, obviously I havent done anything. How do I make the linux box act as a go between? Thank you for any help!