Authentication, authorization, and accounting (AAA) are the important elements in
network security. Resources in the network can be used by users after they have been
authenticated and authorized by authentication server. Nowadays, one of the popular
authentication server used is Remote Authentication Dial In User Service (RADIUS) server.
Many open source softwares are available for free of charge and they can be developed further.
Among RADIUS servers, FreeRADIUS is one of the popular open source software that is
implemented in Linux. Thus, open source FreeRADIUS can be used as the substitution of the
current commercial product