Radius is a server for remote user authentication and accounting. Its primary use is for Internet Service Providers, though it may as well be used on any network that needs a centralized authentication and/or accounting service for its workstations.
The package includes an authentication and accounting server and some administrator tools.
Downloads:
freeradius_tutorial.pdf Patrick Brandao
Links:
http://www.gnu.org/software/radius/
http://www.freeradius.org/
vergenet.net/linux/radius/download.shtml
vivaolinux.com.br/artigos/verArtigo.php?codigo=1842#