internet connection sharing with 2 network cards

[Stephen]

This is a classic internet sharing problem.
My PC has 2 network cards. Eth0 to be my internet side (with fixed IP address 213.xxx/255.255.255.24 and eth1 my intranet side (192.168.0.1).
Under windows, it easy to share the internet connection (eth0) with other PCs on the intranet side.
Does any one know how to do this with knoppix?

There are a couple of programs available firestarter and Bastille-Linux you can get them with apt or there is Arno's Iptables which works well you would have to install the script and change a few lines in the config files.