radius problem

hi
iam new to radius and i setup freeradius since 2 days and all fine to use it with pppoe-server on mikrotik and all fine i create username andpass and it work now i need to bind this things with mac address verification

so if a username and password want to access i need to see if the mac is valid or not for this username and pass

i need help plz any one can help ??? :blush:

Access-request:
Calling-Station-Id - PPPoE - client MAC address in capital letters