Interhack.net: Firewalls Frequently Asked Questions
Features a background, basics, design, implementation issues, port and protocol issues. By Matt Curtin and Marcus Ranum. Documents are also available in Postscript and PDF.
Distributed Firewalls
A preliminary research paper exploring the benefits and possible implementations of a distributed firewall paradigm.
Firewalls and Internet Security: Repelling the Wily Hacker
Web site for the book Firewalls and Internet Security: Repelling the Wily Hacker Second Edition by William R. Cheswick, Steven M. Bellovin, and Aviel D. Rubin. Contains some sample sections and a link to the complete contents of the First Edition.
Firewall-net
Provides security and firewall comparisons, compare tools, configuration tips. Also includes a user forum.
KnowPlace Firewalling
An overview of firewalls and security with particular reference to firewalling with Linux 2.4 and Netfilter/Iptables.
InfoSysSec: Firewall Security and the Internet
A portal for professionals, features links, FAQs, tutorials, product information, magazine articles and downloads.
Shields Up: Personal Firewalls
Features FAQs, reviews, ratings, white papers, and tools to test Internet security and firewall vulnerabilities by Steve Gibson.
"Personal Firewalls" are Mostly Snake-oil
The author explains his opinion that a personal firewall "provides no real additional security over turning off the services that you don't use".
Beginners Guide to Firewalls and Internet Security
This article is intended to provide some basic guidelines for securing your computer, and a better understanding of how some of these technologies work. It is intended primarily for users of high-speed Internet connections, but most of the article is applicable to dial-up Internet users also.
Firewall Appliance Defined
A brief but succinct discussion of what a firewall appliance is, their use and why they are needed. Covers basic firewall technology and firewall appliance and firewall software.
More FAQs, Help, and Tutorials Sites
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