Prank on WiFi leeches

Forget those cheesy in-store firewall routers, considering rolling your own instead with a Linux option!

Everyone knows that you should be behind a firewall whenever you go online. However, not everyone knows that it’s easy to create a personal firewall for a FreeBSD (or PC-BSD or DesktopBSD) system. This article shows how even a casual home user can get a firewall up and running in about ten minutes.

The Software

Like all of the BSDs, FreeBSD has always been security conscious. It offers several built-in firewalls to choose from: ipfw, ipf, and pf. I use pf because it is built into all of the BSDs, including OpenBSD, NetBSD, and DragonFly BSD.

I also recommend using a GUI firewall editor called fwbuilder. While my examples will demonstrate this utility from a FreeBSD system, it is available for Linux, Mac OS X, and Windows XP and supports iptables, ipfilter, pf and ipfw.

pf comes with FreeBSD, but double-check that it is loaded on your system by typing the following as the superuser:… Source: onlamp.com