Refer to the following sources for additional information on packet filtering with iptables.
man iptables — Contains a comprehensive description of various commands, parameters, and other options.
http://netfilter.samba.org — Contains assorted information about iptables 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 links to a variety of update-to-date packet filter resources.
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