Centralize Your Network Protection for Free: Copfilter Reviewed
With a spare notebook or PC and a little time and Copfilter, you can centralize your network virus, spam and email protection.
IPCop
IPCop Linux Firewall
IPCop is a full-featured Linux firewall that can convert an old system into a router that has features not normally found on store-bought products. Daniel Schuhmann takes you through the details.