/etc/freeradius/preproxy_users is in freeradius 2.1.12+dfsg-1.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Configuration file for the rlm_files module.
# Please see rlm_files(5) manpage for more information.
#
# $Id$
#
# This file is similar to the "users" file. The check items
# are compared against the request, but the "reply" items are
# used to update the proxied packet, not the reply to the NAS.
#
# You can use this file to re-write requests which are about to
# be sent to a home server.
#
#
# Requests destinated to realm "extisp" are sent to a RADIUS
# home server hosted by an other company which doesn't know about
# the IP addresses of our NASes. Therefore we replace the value of
# the NAS-IP-Address attribute by a unique value we communicated
# to them.
#
#DEFAULT Realm == "extisp"
# NAS-IP-Address := 10.1.2.3
#
# For all proxied packets, set the User-Name in the proxied packet
# to the Stripped-User-Name, if it exists. If not, set it to the
# User-Name from the original request.
#
#DEFAULT
# User-Name := `%{Stripped-User-Name:-%{User-Name}}`
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