Books
Interconnecting Cisco Network Devices by Steve McQuerry. Cisco Press, 2001.
Mastering Linux, Premium Edition by Arman Danesh. Sybex, 1999.
Red Hat Linux 7 Unleashed by Bill Ball, David Pitts, et al. Sams Publishing, 2001.
Web Sites
Charles Steinkuehler's LEAF/LRP Web Site: lrp.steinkuehler.net
Cisco Systems: www.cisco.com
Geocrawlwer: www.geocrawler.com
Linux.com: www.linux.com
Linux Embedded Appliance Firewall: leaf.sourceforge.net
Linux Router Project: www.linuxrouter.org and lrp.ramhb.co.nz
Sangoma Technologies: www.sangoma.com