try radcheck table if you want to restrict each user or radgroupcheck if you want top restrict certain group. here's my config....
radius=> select * from radcheck where username = 'cache'; id | username | attribute | op | value -----+----------+---------------------+----+----------------- 261 | cache | Expiration | := | 01 January 2005 257 | cache | Max-Monthly-Session | := | 12300 766 | cache | Simultaneous-Use | := | 1 1 | cache | User-Password | := | cache (4 rows) - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html