10 iptables rules to help secure your Linux box | 10 Things | TechRepublic.com
http://blogs.techrepublic.com.com/10things/?p=539

allow you to actually work normally on your desktop. All network traffic going out of your machine will be allowed out, but all TCP/IP traffic coming into your m

Mastering iptables could take a while, but if you have a few rules to cover the basic security needs, you’ll be well on your way to protecting your Linux system. Jack Wallen explains some key rules to get you started.