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The Book of PF, 2nd Edition by Peter N.M. Hansteen

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The Rise of PF

If you have a taste for history, you probably already know that OpenBSD and the other BSDs[3] are direct descendants of the BSD system (sometimes referred to as BSD Unix), the operating system that contained the original reference implementation of the TCP/IP Internet protocols in the early 1980s.

As the research project behind BSD development started winding down in the early 1990s, the code was liberated for further development by small groups of enthusiasts around the world. Some of these enthusiasts were responsible for keeping vital parts of the emerging Internet’s infrastructure running reliably, and BSD development continued along parallel lines in several groups. The OpenBSD group became known as the most security-oriented ...

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