IPTables is a firewall, installed by default on most Linux distributions. With IPTables you can set up a host-based firewall to keep ACCEPT what you want and DROP what you don't. Would'nt you like to make your firewall more than just filter packets? How about fingerprinting the OS's of systems that touch your firewall? Maybe rate limiting incoming packets appeals to you? Are Denial-of-Service attacks eating up your bandwidth and causing security concerns? You can use iptables to limit the number of connections from a system. Using IPTables, you can make your laptop more secure at the local coffee bar and your servers more resistant to attack. These tips and tricks will show how and you'll realize there's more to IPTables than just ACCEPT and DROP. Slides are at: linuxfestnorthwest.org/sites/default/files/slides/IPtables Tips and Tricks-3.ppt Previous Presentations at LinuxFest NW: Open Source Vs. Network Attackers linuxfestnorthwest.org/sites/default/files/slides/Whats in Your Arsenal.ppt null: https://www.youtube.com/watch?v=ModN8Flz89Y The Linux Audit Framework: http://linuxfestnorthwest.org/2013/sessions/linux-audit-framework null: https://www.youtube.com/watch?v=x2u_prS2HmM SELinux for Dummies: http://linuxfestnorthwest.org/2013/sessions/selinux-dummies null: https://www.youtube.com/watch?v=q_y30qZ_plQ