Anonymuser Limitation

[myxmail1919 at yahoo.com]

Hello, 
its a log time i tm trying to limit anonymusers in freeradius, i have tried many things but somehow not working or not stable !have an idea  ! is it possible to put anonym user in the group and make some group policies ?im trying to limit time and data usage for anonymusers who login with mac address ! im really get mad about this !  i got this task  2 month ago and i cant finish it !
would you please help me ? Thanks