Refer to the following sources for additional information on packet
filtering with iptables.
16.5.1. Installed Documentation
man iptables — Contains a
comprehensive description of various commands, parameters, and
16.5.2. Useful Websites
— Contains assorted information about
iptables, including a FAQ addressing specific
problems and various helpful guides by Rusty Russell, the Linux IP
firewall maintainer. The HOWTO documents on the site cover
subjects such as basic networking concepts, 2.4 kernel packet
filtering, and NAT configurations.