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Building a Linux Firewall
How do you use netfilter to build a firewall? Netfilter is composed of several different modules that can help you with packet filtering. The most commonly used module is iptables, which uses chains to direct traffic, and rules to modify the chains. Iptables is a replacement for the ipchains program found in the 2.2 and earlier kernels.
- Oskar Andreasson IP Tables Tutorial
- Linux 2.4: Next Generation Kernel Security
- Linux Kernel 2.4 Firewalling Matures: netfilter
- Scanning and Defending Networks with Nmap
The link for this article located at Linux Business Week Magazine is no longer available.