radius.conf
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The radius.conf file specifies the server, port and shared secret necessary to authenticate against a RADIUS server.

You must specify the server (by IP), the port, and the shared secret. Put a :R after the User Type in the accounts.conf file to specify that the user should be authenticated with RADIUS, instead of the Built-In authentication.

radius.conf.sample file
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# The IP address or hostname of the radius server
server=a.b.c.d
#
# The port of the radius-server, if it is zero it will take the
# one specified in /etc/services. 1645 is a well known one.

port=1645
#
# Shared secret for the server
#
secret=sharedsecret
#
# Whether to send the domain when authenticating
# 0 - Send john_doe    1 - Send john_doe@domain.com
# If usedomain is not set, then it defaults to 1
#
usedomain=1