freeradius+mysql

Hi, I am using mysql with free radius for user authorization and accounting with assignment of ip pools from iptables in mysql. These all are working. But, I would like to know if we can bypass the authorization phase with mysql and use only ip pool assignment. Can you help in this part. Like even if the user is not authenticate, I wanted to send always access accept message with a framed ip from the ip pool table. Thanks, Nanthitha