Additional Resources

See the sources below for additional information on packet filtering with iptables.

Installed Documentation

The iptables man page contains a comprehensive description of various commands, parameters, and other options.

http://netfilter.samba.org — Contains assorted information about iptables, including an FAQ addressing specific problems you may experience and various helpful guides by Rusty Russell, the Linux IP firewall maintainer. The HOWTO documents here cover subjects such as basic networking concepts, 2.4 kernel packet filtering and NAT configurations.
http://www.linuxnewbie.org/nhf/Security/IPtables_Basics.html — A basic and general look at the way packets move through the Linux kernel, plus an introduction to constructing simple iptables commands.
http://www.redhat.com/support/resources/networking/firewall.html — This webpage contains update-to-date links to a variety of packet filter resources.