Additional Resources

The Official Red Hat Linux Reference Guide has a comprehensive chapter on iptables, including definitions for all command options.

The iptables manual page contains a brief summary of the various options, as well.

http://www.netfilter.org — The official homepage of the Netfilter/iptables project.

http://www.redhat.com/support/resources/networking/firewall.html — Red Hat Support firewall resource page.

http://www.tldp.org — The Linux Documentation Project contains several useful guides relating to firewall creation and administration.

Linux Firewalls, by Robert Ziegler, contains a wealth of information on building firewalls using both 2.2 kernel ipchains as well as Netfilter and iptables. Additional security topics such as remote access issues and Intrusion Detection Systems are also covered.