separating Useres

[myxmail1919 at yahoo.com]

Hi Guys, 

 i have freeradius 3.0.15 and Mysql DB 


we use MAC authentication 
so everyone allowed to connect if they are not exceeded their limits. (anonymusers ,  not exist in DB ) 

In   /etc/freeradius/3.0/sites-available/default   I have 

 update control {

                Max-Daily-Session= 1800

         }

         update control {

        Acct-Output-Octets := 307200

         }



 So by default every user has 1800 Seconds and 300 Mb daily limit

is there anyway to  make exception for some users ?  like 7200 seconds and 1 Gb daily limit


Thanks