Floppyfw

floppyfw was a Linux distribution running BusyBox to provide a firewall/gateway/router on a single bootable floppy disk, but was later available in CD format.

Reviews concluded that it was a very simple and reliable gateway/firewall that could be established on small to medium-sized networks at low cost and with ease. One independent study concluded that it was " best possible security provided by a floppy-based firewall" for the repurposing of old, redundant hardware into Linux-based firewalls or routers.

Requirements

 * Intel 80386SX or better
 * two network interface cards
 * 1.44MB floppy drive
 * 12MByte of RAM

Features
Floppyfw's features include:
 * Access lists
 * IP-masquerading (network address translation)
 * Connection tracked packet filtering
 * Quite advanced routing
 * Traffic shaping
 * PPPoE
 * Very simple packaging system. Is used for editors, PPP, VPN, traffic shaping and whatever comes up
 * Logging through klogd/syslogd, both local and remote
 * Serial support for console over serial port
 * DHCP server and DNS cache for internal networks