Very nice introduction, explaining what a network is, and how it is
connected to other networks.
Linux Networking-HOWTO (Previously the Net-3 HOWTO)
Great stuff, although very verbose. It teaches you a lot of stuff
that's already configured if you are able to connect to the Internet.
Should be located in /usr/doc/HOWTO/NET3-4-HOWTO.txt
but can be also be found
online.
