Internet Protection and Security by Firewalls Paper
General overview of firewalls and their roles in mitigating various forms of network attacks. Includes case studies.
http://www.geocities.com/francis_abraham/tech_docs/firewall.html

Wie Personal Firewalls ausgetrickst werden können
Der Text behandelt Unzulänglichkeiten von Desktop-Firewalls beim Kontrollieren des Datentransfers und externer Zugriffsmöglichkeiten. (veraltet, zum Löschen vorgesehen)
http://home.arcor.de/nhb/pf-austricksen.html

[de.comp.security.firewall] Personal-Firewalls austricksen
Konzeptbasierte Grenzen von Personal-Firewalls und dadurch entstehende Gefahren.
http://home.arcor.de/nhb/pf-austricksen.html

Personal Firewalls - what they can do and what they can't
If you read articles about what firewalls do, how firewalls work, how firewalls defend against hackers, and it just added to your confusion. I hope this article is different.
http://www.geocities.com/uzipaz/eng/pfnt.html

Building Internet Firewalls, 2nd Edition
Completely revised and much expanded, the new edition of the highly respected and bestselling Building Internet Firewalls now covers Unix, Linux, and Windows NT. This practical and detailed guide explains in step-by-step fashion how to design and install...
http://www.oreilly.com/catalog/fire2/

Proxy Server und Firewalls
Einführung in Proxy Server, Firewalls und Anonymität im Internet sowie ein Anonymitätstest.
http://anonymsurfen.net/

Network Security, Filters and Firewalls
This article is a general introduction to network security issues and solutions in the Internet; emphasis is placed on route filters and firewalls. It is intended as an overview. Some knowledge of IP networking is assumed, although not crucial.
http://www.acm.org/crossroads/xrds2-1/security.html

Bundesamt für Sicherheit in der Informationstechnik - BSI Studien Firewall 2001
Firewallstudie des BSI
http://www.bsi.de/literat/studien/firewall/fwstud.htm

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.
http://www.wilyhacker.com/

Freewarepage.de - Firewall Programme
Kostenlose Firewall Software - Personal Firewall Download als Freeware
http://www.freewarepage.de/internet_und_dfue/firewalls/