Hi Ronald
I   have tried this option but the clients do not disconnect or their   device remembers the credentials and reconnects automatically.
I need an option that disconnects the client and the client has to re-enter the radius credentials to reconnect again.
The   most similar option I have found is through captive portal with radius   authentication with guest users with access duration time. After   this time, the client is disconnected and to reconnect the client  have to enter username and password in the captive portal again.
I need an option like this but without going through the captive portal.
Thanks