- DShield
 - Provides a platform for users of firewalls to share intrusion information. - Home PC Firewall Guide
- Offers information on improving Internet security by using secure email, firewall router and personal firewall, anti-virus, anti-Trojan, and anti-spyware software on desktop computers. Also includes product reviews.
- Nmap
- Audit firewall configuration using this stealth port scanner.
- HowStuffWorks: Firewalls
- Overview of what they do and how they work.
- FAQ - TIS FireWallToolKit
- Information on the popular freely-available firewall.
- Personal Firewall Day
- Information about protecting computers with personal firewalls.
- FAQ - Internet Firewalls:
- Background, design and implementation issues, how-tos, and other technical information.
- Firewallpedia
- Firewall resource guide covering the basics, network layers, and application layers.
- Perimeter Defense Architecture
- Lengthy illustrated paper by Lenny Zeltser provides instructions for configuring firewalls and routers and describes steps for auditing the defence perimeter.
- LevelSecurity.com
- Providing a broad overview and comparison of available firewall technologies and the TCP/IP model.
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