Add client to /etc/freeradius/3.0/clients.conf
client someclient.tek {
ipaddr=172.22.42.4
secret=xxxxxxxxxxxxxxxxx
shortname=internal-network
login = !root
}
Set daemon to run with group shadow in /etc/freeradius/3.0/radiusd.conf
Uncomment unix type in /etc/freeradius/3.0/sites-available/default to enable reading of passwd/shadow information.