..::Multiple Devices::..

Hi List. I'm new to the radius Server, We want to use the radius for all the connections on our network, the thing is that we want to allow a group of users to a group of access points, and use the same radius to control our vpn connections. As far as I understand if we allow anyone on the radius, it will be allowed on all the devices. The question is: Is there a way to limit the users connections to some devices? Thanks for your advice; We look forward to read your answer. Have a great day. Alfonso