References and resources

The following resources are always useful in an OpenBSD context:

The OpenBSD FAQ, http://www.openbsd.org/faq/index.html

Michael W. Lucas, Absolute OpenBSD, 2nd edition, No Starch Press 2013

Peter N. M. Hansteen, The Book of PF, 2nd Edition, No Starch Press November 2010. The third edition is coming soon! (and likely available here).