Falcon Firewall Project:
UNIX/Linux open firewall project that intends to develop a free,
secure and OS independent firewall system. Includes an overview,
FAQs, documentation, and software downloads.
http://falcon.naw.de
The Firewall Toolkit (FWTK):
A set of proxies to build a firewall. Provides information and
software on building free firewall and security solutions.
http://www.fwtk.org/
Interhack.net: Firewalls Frequently Asked Questions:
Features a background, basics, design, implementation issues, port
and protocol issues. By Matt Curtin and Marcus Ranum.
http://www.interhack.net/pubs/fwfaq/
Linux Firewall and Security:
Features FAQs and links of interest. Also contains information on
building and configuring of LAN security.
http://www.linux-firewall-tools.com/
Linux Firewall and Proxy Server HOWTO:
White paper outlining the basics of firewall systems and giving
details on setting up both, a filtering and proxy firewall on a
Linux based system.
http://www.grennan.com/Firewall-HOWTO.html
How Stuff Works: Internet Firewalls:
An introductory explanation of how a firewall works and the various
filtering methods used, with related links.
http://www.howstuffworks.com/firewall.htm
Ipchains Log Parser:
A Perl script to parse ipchains log entries from the syslog and
store them into a MySQL database.
http://www.tu-chemnitz.de/~als/software/ipchains/index.html
COAST Internet Firewalls Hotlist:
A comprehensive list of firewall vendors, white papers, resources,
and FAQs.
http://www.cerias.purdue.edu/coast/firewalls/
GNAC Inc.: Firewalls Mailing List:
For discussions of Internet firewall security systems and related
issues. Also features searchable archives and digests.
http://www.isc.org/services/public/lists/firewalls.html