18.9.2. 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.