ADMIN - Explore the new world of system administration! Special introductory offer! Order by September 30th to save 10% off the regular subscription price! Each issue delivers technical solutions to the real-world problems you face every day. Learn the latest techniques for better:
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on Windows, Linux, Solaris, and popular varieties of Unix.
We’ll show you how to build your own Netfilter extension with this example of a musical firewall.
Netfilter is the Linux kernel subsystem behind firewall tools such as the famous Iptables. The Netfilter subsystem provides the structure for packet filtering and address translation by offering a series of hooks into the network protocol stack. You can find many commands, scripts, and front-end applications for accessing the Netfilter subsystem – including tools such as Shorewall and Firestarter, as well as the native Iptables – so you don’t have to be a programmer to access the powers of Netfilter. However, if you are ready for a little programming, you can use the built-in Netfilter hooks to create your own custom firewall modules.
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