Setting up a simple Linux firewall
This is an overview of the things I think you need to know if you're going to try and set up a simple firewall using linux on an old PC.
For a PC to be used as a firewall, it needs two ethernet cards (aka NICs or "Network Interface Cards"). If you need to buy a second card to do this with, see the above point. Ditto if you need to buy a 10baseT hub.
By Joseph Brenner at obsidianrook.com
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