Linux Firewall with a computer
 

Well i was thnking about using a old pc i have and use a linux distro for a firewall i have heard there is one for it. is that true and which is it. And how does one use it?

Smoothwall is a great Linux based Firewall. This firewall has many of the basics that most people would need to have in a firewall, plus many add-on packages that most power users would need. The main site is http://www.smoothwall.org. The forum community is very helpful at resolving any problem that you might run into. Cheers!