We have a wireless setup including a Cisco ACS RADIUS server. I was checking the reports and under "Failed Attempts" , I found a failed attempt of description "Unknows NAS" and NAS IP address which does not belong to our network.
Can someone explain me what does that mean. Normally any user trying to get to our network and barred by network (for wrong password etc) shows up in this area. Additionally the NAS IP address shown in the report is not part of ACS configuration, so how it showed up the RADIUS server.