This works fine for me. It is POD message (packet of disconnect) Check port number and check NAS and radius log files if it doesn't work. If you have some programming skills, you can create schedule script to disconnect all active users at specific time...
User-Name = xxx@xxxx.com <mailto:xxx@xxxx.com> Acct-Status-Type = Start Acct-Session-Id = "12345678.90.123" NAS-Identifier = "router" NAS-IP-Address = 200.10.50.100 NAS-Port-Type = Virtual Framed-IP-Address = 200.10.50.1 Acct-Delay-Time = 0 Client-IP-Address = 200.10.50.100 Acct-Unique-Session-Id = "8d120506b2972302"
I put this in packet.txt
I tried : cat packet.txt | radclient -x 200.10.50.100:3799 disconnect mysecret //