Building the network you need with PF, the OpenBSD packet filter

"This (one day or half day) session is aimed at experienced or aspiring
network administrators who want to expand their knowledge of PF, the
OpenBSD packet filter, and related tools. A basic knowledge of Unix and
TCP/IP network configuration is expected and required. Topics covered
include

* Configuration on OpenBSD, FreeBSD and NetBSD
* PF ruleset basics and rule interactions: block, pass, match
* Writing maintainable rulesets
* Address families: IPv4 NAT vs IPv6
* Redirections and services with odd dependencies (ftp-proxy, spamd)
* Adaptive rulesets (state tracking tricks)
* ALTQ traffic shaping
* Per user filtering with authpf
* High availability with CARP, relayd
* Wireless vs wired networks
* Filtering bridges
* Logging and monitoring - pflog, pflow and others
* Testing, debugging, and optimizing your configuration

The session will provide updates on the new PF syntax and features
introduced in OpenBSD 4.7 (with samples presented in the old and new
syntax where appropriate), with newer updates and previews of relevant
new features in the upcoming OpenBSD 5.1 release (planned release date
May 1st, 2012)."