802.1X Port-Based Authentication HOWTO
The binaries are installed in /usr/local/bin and /usr/local/sbin. The configuration files are found under /usr/local/etc/raddb.
If something went wrong, check the INSTALL and README included with the source. The [http://www.freeradius.org/faq/] RADIUS FAQ also contains valuable information.
3.2. Configuring FreeRADIUS
FreeRADIUS has a big and mighty configuration file. It's so big, it has been split into several smaller files that are just "included" into the main radius.conf file.
There is numerous ways of using and setting up FreeRADIUS to do what you want: i.e., fetch user information from LDAP, SQL, PDC, Kerberos, etc. In this document, user information from a plain text file, users, is used.
Tip The configuration