Linux Home Networking - Information and tips for home users. - http://www.linuxhomenetworking.com/
Networking Overview HOWTO - The Linux Networking Overview HOWTO provides well-organized information regarding Internet protocols, networking hardware, interconnecting devices, and network management. - http://en.tldp.org/HOWTO/Networking-Overview-HOWTO.html
Linux IPCHAINS-HOWTO - Linux ipchains guide including details on firewalling, masqerading, and port forwarding. - http://en.tldp.org/HOWTO/IPCHAINS-HOWTO.html
Linux IPX HOWTO - How to install and configure IPX networking for Linux. - http://en.tldp.org/HOWTO/IPX-HOWTO.html
Linux IPsec HOWTO (kernel 2.4 & 2.6) - This HOW-TO document describes using IPsec in the Linux 2.4 (FreeS/WAN) and 2.6 kernels. - http://www.ipsec-howto.org/
Linux 2.4 Advanced Routing HOWTO - Covers bridging, traffic shaping, arp and proxy-arp, packet queueing, reverse path filtering, firewalling, IPSEC, and IPv6 tunneling with Cisco and/or 6Bone. - http://lartc.org/howto/
IPSEC VPN Masquerade HOWTO - Contains details for adding support for the ESP and GRE protocols to the Linux kernel masquerading code. - http://www.impsec.org/linux/masquerade/VPN-howto/VPN-Masquerade.html
Linux Network Administrator's Guide, 2nd Edition - Second edition. Also published as a book by O'Reilly. Includes information about configuring TCP/IP, IP accounting, masquerading/NAT, NFS, IPX, and NCP. - http://www.oreilly.com/catalog/linag2/book/index.html
Home Networking HOWTO - Includes material on configuring proxy, webserver, FTP, SSH, and more on a home Linux machine (dial-up). - http://www.fandelem.com/nhf.html