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Cisco VPN: Single user authentication

This is a follow-up to this post: http://www.experts-exchange.com/Networking/Q_21699158.html

How can ensure that mulitple users do not logon with the same userid? ie: when someone has authenticated using "jolly" & has an active tunnel, noone else can authenticate using the same userid.
1 Solution
use a Windows RADIUS server to authenticate and set the concurrent logons to 1, this will prevent other users to authenticate using the same username.

I am not aware of any way to do this directly on the IOS, as i believe there is noo function for this. but anyone correct me if i am wrong.

RADIUS is the only way i know to do this.

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