Understanding iptables and Netfilter: Hook Points, Tables, and Rule Processing

This article provides a detailed walkthrough of how iptables interacts with the Netfilter framework, covering the five Netfilter hook points, table and chain structures, NAT handling, rule syntax, and the kernel registration process for hook functions, all illustrated with concrete code examples.

Linux firewallNATNetworking

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Understanding iptables and Netfilter: Hook Points, Tables, and Rule Processing