Installed, available, and missing modules

In the previous chapters we were already exposed to various modules that helped with Authorization, Authentication, and Accounting (AAA). As a refresher and introduction to this chapter the following table lists some of them:

Module	Function
files	Makes use of the users file located in the FreeRADIUS configuration directory to find a user's detail.
sql	A module that is configured to make use of a database-specific sub-module to find a user's details. Also used to store accounting records inside an SQL database and to check for simultaneous connections.
logintime	A module that looks for the presence of the Login-Time check attribute to see if a user is authorized to access the network.
perl	A module that causes FreeRADIUS to load the Perl interpreter plus a specified Perl script into memory during start-up. This ensures super-fast execution.
pap	Used when Auth-Type = PAP to authenticate a user.