Every tuesday, at AWeber, we have a Tutorial Tuesday. Engineers submit topics they would live to present, and everyone vote for the ones they are interested in. A few weeks ago, I presented on Netfilter and Iptables. The goal was to give a quick overview of the firewall of Linux, show some basic and advanced features, and give some tools to help developers debug firewall issues.
I will present some of this material again at FOSSCON Philadelphia, on August 11th. So if you are in the area, come to the workshop: http://fosscon.org/
