Introduction to OpenBSD Networking
"In today's Internet-centric computing world, networking components are a paramount feature of any system worth its salt. Easily falling into that category, OpenBSD contains strong network code and configuration interfaces which, with a little research and learning, can be put to powerful use. This series of articles aims to illustrate that with practical examples and direct application to real-world situations." Read the article at OnLamp. In the meantime, patch 001 for OpenBSD 3.2 was posted.