Our customers are randomly being disconnected with a termination reason of Port-Preempted, what can cause this?
Oct 30 2007
Air Marshal continually checks to make sure the users MAC address has not changed. If a change is detected the session is disconnected with the message port-preempted requiring the user to re-authenticate. Possible causes of a detected change are:
Routers or other devices configured with Proxy ARP enabled. Proxy ARP should be disabled on all customer facing routers.
New customer re-assigned an existing sessions address via DHCP
Hacking / Attempt to reuse an authenticated IP address.
