I've been looking into trying a bunch of different this this summer with my older systems. I know I'm going to make a file/print server, but I also saw that you can turn an old system into a firewall. Is there a certain firewall software that's free you would recommend over another?
I've looked at some of this. It's a list of Linux Firewalls.
Then there's Smoothwall.
That's all I've seen so far. Anything better or recommended?