Additional Resources

There are several aspects to firewalls and the Linux Netfilter subsystem that could not be covered in this chapter. For more information, refer to the following resources.

Installed Documentation

Refer to "IPTables" for more detailed information on the iptables command, including definitions for many command options.

The iptables man page contains a brief summary of the various options.

Useful Websites

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

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

http://www.iana.org/assignments/port-numbers - The official list of registered and common service ports as assigned by the Internet Assigned Numbers Authority.

Related Documentation

CentOS Linux Firewalls, by Bill McCarty; CentOS Press - a comprehensive reference to building network and server firewalls using open source packet filtering technology such as Netfilter and iptables. It includes topics that cover analyzing firewall logs, developing firewall rules, and customizing your firewall using various graphical tools.

Linux Firewalls, by Robert Ziegler; New Riders Press - 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.