Sentry Firewall
Sentry Firewall CD-ROM is a Linux based bootable CD-ROM suitable for use as an inexpensive and easy to maintain Firewall or IDS (Intrusion Detection System) Node. The system is designed to be immediately configurable for a variety of different operating environments via a configuration file located on a floppy disk or a local hard drive. Version 1.2.0 was released March 27, 2002. Version 1.5.0-rc16 was released January 13, 2005. According to the website the project is stalled, posted March 18, 2006.
Sentry FirewallOfficial website
Download link to the distribution ISO