Hardware Firewall

The best firewall is a hardware firewall that is completely separate from your operating system. It need not be a dedicated router, could be an old pentium box running Linux. Below I have found some sites that have How To's on setting up an outside hardware router using an old computer and using a little linux program that fits on a single floppy disk.

Brief Description:
floppyfw is a router with the advanced firewall-capabilities in Linux that fits on one single floppy disc.

Features:
Access lists, IP-masquerading (Network Address Translation), connection tracked packet filtering and (quite) advanced routing. Package for traffic shaping is also available.
Requires only a 386sx or better with two network interface cards, a 1.44MB floppy drive and 12MByte of RAM ( for less than 12M and no FPU, use the 1.0 series, which will stay maintained. )
Very simple packaging system. Is used for editors, PPP, VPN, traffic shaping and whatever comes up. (now this is looking even more like LRP (may it rest in peace) but floppyfw is not a fork.)
Logging through klogd/syslogd, both local and remote.
Serial support for console over serial port.
DHCP server and DNS cache for internal networks.