Firewalling with PF manuscript
Peter N. M. Hansteen released an updated version of the »Firewalling with PF manuscript«.
This lecture is about firewalls and related functions, starting from a little theory along with a number of examples of filtering (from real life with the OpenBSD project's Packet Filter - PF) and other network traffic directing. He discusses PF firewall configuration on various BSDs - FreeBSD, OpenBSD and NetBSD. The lecture is a work in progress and will be updated periodically.