Installing FreeRadius

Installing freeradius in Ubuntu 16.10:

sudo apt-get install freeradius

Configuration

Edit the freeradius users:

sudo nano /etc/freeradius/users

Uncomment the user 'John Doe':

"John Doe" Auth-Type := Local, User-Password == "hello"
Reply-Message = "Hello, %u"

Test teh connectivity from local machine:

sudo radtest "John Doe" hello 127.0.0.1 0 testing123

Remote access to the radius server

sudo nano /etc/freeradius/clients.conf

And add the following snippet:

client 0.0.0.0/0 {  
  secret = "mysecret"
  shortname = name
}

Now from another machine, try the following:

radtest "John Doe" "hello" example.com 0 "mysecret"

You will get Access-Accept packet and "Hello, John Doe" messages.

= Logging

The "log" section of the radiusd.conf file is where the primary logging configuration for the FreeRADIUS server is located.

log {
    destination = files
    file = ${logdir}/radius.log     # If Server is running in debugging mode, this file is NOT used.
#   requests = ${logdir}/radiusd-%{%{Virtual-Server}:-DEFAULT}-%Y%m%d.log
    syslog_facility = daemon
    stripped_names = no
    auth = no
    auth_badpass = no
    auth_goodpass = no
#   msg_goodpass = ""
#   msg_badpass = ""
}

Destination options:

files - log to "file", as defined below.
syslog - send log messages to syslog 
stdout - log to standard output.
stderr - log to standard error.

References

{{#widget:DISQUS |id=networkm |uniqid=Radius Server |url=https://aman.awiki.org/wiki/Radius_Server }}