Brass Cannon Consulting: Networking howtos.
DECnet for Linux: A project to provide DECnet phase IV connectivity for Linux
Introduction to Linux Networking and Security: Brief introduction to the IP networking services, how to configure them, and how to set up a relatively secure Linux workstation.
LinNeighborhood: GUI frontend for Samba. Browse your LAN in style.
Linux IP Masquerade Resource: Contains an introduction, a HOWTO, and information about masquerading with 1.x, 2.0.x, and 2.2.x Linux kernels.
LinuxPlanet Network Security Tutorials: Provides a short introduction to Linux network security.
LISa - LAN Information Server: LAN networking with the TCP/IP protocol.
Sangoma Home Page: Sangoma
Snafu Hall: Linux 2.2 Networking: Information about ipchains, ipmasqadm, and net-tools. Site is based on the 2.2.14 kernel.
X/OS: Linux IP Firewall and Accounting Services: Information regarding ipfwadm, including papers, and source code.