As you may see from this diagram I have given each computer an IP address and a simple name. Of course you can change these to suite your own system. We'll discuss proxy servers a bit later. All the other software needed for this exercise I was able to find on my Linux distribution disk. First set up the firewall computer.
Arrow keys navigate the menu.
Some people might like to set IP accounting or IP firewall packet logging but for an initial test these settings will do fine. When compiled and rebooted check that the system is set up correctly. If this is the case then so far so good. If this is the case then you have successfully installed a firewall. This seems pretty silly because now I can't use the internet from my main system.