Old Linux Guides
You may find these useful. I have not updated them in some time (circa 1999), but they are generally still accurate.
- A simple VI reference sheet
- Configuring Linux as an IP Masquerade Router
- Using Samba for Windows networking and file share
- Quick steps to protect your Linux host
- Configuring ftp and telnet
- Writing a firewall in ipchains
- Configuring a new kernel
- Hosting a DNS server
- Hosting a Sendmail based mail system
- Configuring PPP for modem dial-up connections
- Mounting diverse filesystems
- A guide to subnetting
- Using WAN cards, including PCI T1/E1 and DS3