Linux HOWTO on using remote serial consoles.

Linux ipchains guide including details on firewalling, masqerading, and port forwarding.

The Linux Networking Overview HOWTO provides well-organized information regarding Internet protocols, networking hardware, interconnecting devices, and network management.

How to install and configure IPX networking for Linux.

Linux Benchmarking HOWTO

Linux PPP HOWTO at Linux DOC.

This document will describe how to get your Linux box to connect to a generic site via a SLIP/PPP emulator, such as SLiRP or TIA.

Security issues that face the administrator, security philosophy, examples of how to secure the system from intruders.

Describes how to obtain, install and configure the enhanced IP firewalling chains software for Linux, and how they might be used, by Paul Russell.

Teaches the basics of firewall systems and give you some detail on setting up both a filtering and proxy firewall on a Linux based PC, by Mark Grennan.