You may have heard mention of DD-WRT on the PC Perspective Podcast, which enables you to flash a compatible router into a Linux based firewall with significanly more capabilities than it originally had.  There is another tool out available call Fwbuilder which lets you make a PC running Linux into a powerfull firewall with an easyto use graphical interface for those not up on their VIM skills.  Drop by Linux.com for a look.

"Fwbuilder is a unique graphical firewall tool that allows the user to create objects and then drag and drop those objects into firewalls, to build a powerful security system for a single PC or a network of PCs. Fwbuilder supports a wide range of firewalls (Cisco ASA/PIX, Linux iptables, FreeBSD’s ipfilter, OpenBSD’s pf, and more), so its rules can be deployed on multiple platforms. Let’s take a look at using Fwbuilder on Linux, which might just become a life-long affair with a powerful security system."

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