Introduction to netfilter/iptables (IBM developerWorks) [LWN.net]

Mugdha Vairagade explains how to set up IP filtering with Linux 2.4. "The netfilter/iptables is the IP packet filtering system that is integrated with the latest 2.4.x versions of the Linux kernel. This system facilitates greater control over IP packet filtering and firewall configuration on Linux systems, be they systems connected to the Internet or a LAN, servers, or proxy servers interfacing between a LAN and the Internet. Mugdha Vairagade provides an introduction to the netfilter/iptables system, how it works, its advantages, installing and configuring, and how to use it to configure firewalls on Linux systems to filter IP packets."

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