take a look, in french http://www.pervasive-network.org/SPIP/forum.php3?id_article=22 in italian http://trashware.linux.it/wiki/Faber_Libertatis/HotspotDebianSarge in english debain /usr/share/doc/freeradius-dialupadmin/HOWTO.gz
is not difficult - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html
