Translations:Home router/13/en
From Gentoo Wiki
The next thing needed is support for IP tables and NAT (and packet shaping if desired). The following list is split up into always required (*), required only for ADSL via PPPoE (a), suggested for everyone (x), and only for shaper (s) features. It does not matter whether the features are built into the kernel or as modules as long as when the feature is needed, the correct module(s) are loaded. For more information on loading modules see the Kernel Modules Guide.