/usr/share/doc/php-radius-legacy/examples/server.conf is in php-radius-legacy 1.2.5-2.4build1.
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# $Id: radius_authentication.conf.template,v 1.1 2001/08/24 14:19:10 mavetju Exp $
#
# 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 0
#
# Suffix for the userids (if no @ in the userid yet)
#
# This might be a little bit tricky to understand. Normally, you can
# authenticate via "user" or "user@domain". To make it easier for
# people, the "@domain" is often defaulted to a special domain. For
# example, if the suffix is foo.bar, the users will be authenticated
# as "user@foo.bar", while it is still possible for somebody else,
# who is not in domain foo.bar to give "admin@foo2.bar" for his userid.
#
#
suffix ""
#
# Shared secret for the server
#
secret sharedsecret
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