Veghead's Guide to OpenBSD Firewalls
- Introductory guide to implementing a firewall using OpenBSD.
- http://www.fatsquirrel.org/veghead/wot/openbsd.html

Design and Performance of the OpenBSD Stateful Packet Filter (pf)
- This paper from Usenix 2002 describes the design of the new OpenBSD packet filter (pf) and compares performance of stateful vs. stateless filtering.
- http://www.benzedrine.cx/pf-paper.html

IPSEC Bridging Under OpenBSD
- 'Plugging holes with your fingers' - a guide to configuring IPSEC in OpenBSD.
- http://default.co.yu/~bc/docs/ipsec_bridging-1.txt

OpenBSD Packet Filter (pf)
- Information regarding history and design of the new OpenBSD packet filter (pf).
- http://www.benzedrine.cx/pf.html

IPSec HOWTO [Linux, OpenBSD, PGPNet]
- Configuration document on IPSec interoperations for Linux, OpenBSD and PGPNet.
- http://www.rommel.stw.uni-erlangen.de/~hshoexer/ipsec-howto/HOWTO.html

Future-Adaptable Password Scheme
- Whitepaper by OpenBSD developers Niels Provos and David Mazières discussing ways of building systems in which password security keeps up with hardware speeds.
- http://www.usenix.org/events/usenix99/provos.html

Cryptography in OpenBSD: An Overview
- Whitepaper presented at USENIX 99 by OpenBSD developers Theo de Raadt, Niklas Hallqvist, Artur Grabowski, Angelo D. Keromytis, and Niels Provos discussing the cryptography employed in OpenBSD.
- http://www.usenix.org/events/usenix99/deraadt.html

Hardening OpenBSD Internet Servers
- Tutorial on hardening and improving security on OpenBSD systems.
- http://geodsoft.com/howto/harden/

Dealing with Public Ethernet Jacks
- Whitepaper from the University of Alberta on using OpenBSD to block unauthorized users on unprotected Ethernet jacks.
- http://www.ualberta.ca/~beck/authgw.html

S/Key configuration on OpenBSD
- How to configure and use the S/Key 'one-time password' scheme on OpenBSD.
- http://tika.arnholm.nu/skey.html

Secure Internet Servers/Firewalls with OpenBSD
- Outline notes for the half-day tutorial presented at the O'Reilly Open Source Conference in Monterey, California on July 17, 2000.
- http://www.openbsd.org/papers/oreilly2000/

Transparent Network Security Policy Enforcement
- Whitepaper by OpenBSD developers Angelos Keromytis and Jason Wright presented at USENIX Technical Conference, June 2000.
- http://www.thought.net/jason/bridgepaper/

IP Filter HOWTO
- Usage guide for the IP Filter firewall software formerly included with OpenBSD.
- http://www.obfuscation.org/ipf/

PGPnet & OpenBSD
- How to configure isakmpd on OpenBSD to use the PGPnet client.
- http://www.allard.nu/openbsd/

Authentication using X.509v3 certificates with isakmpd.
- How to use X.509v3 certificates for authentication with OpenBSD's isakmpd.
- http://hem.passagen.se/hojg/isakmpd/