Hi I am newbie at this help please

Description
O. System Windos Vista
With 1 application of Oracle VM VirtualBox Virtual Machine
O. System Ubuntu 10.10
with a server radiusd
aser nesesito mac filtering equipment through this server

Well my question is if the users file I register users with their password to be linia file that I register the MAC addresses

Well I hope and I can help because it is very important to me as it is for a practice School Thanks