Summary An explanation of firewalls, types of firewalls, stateless vs stateful filtering, placement of firewalls within a network, examples of firewall rules, and the importance of having an established security policy. 19:54 - Windows firewall settings 29:10 - Listing of firewall rules in iptables 30:58 - Viewing incoming packet information in iptables Reference Materials Guide to Network Defense and Countermeasures - Chapter 9 Additional Information Building a firewall, Part 1 (of 3): http://www.windowsecurity.com/whitepapers/Building_your_firewall_Part_1.html