A method, apparatus, and computer-readable media for detecting a security
breach in a network comprising an access point and a plurality of
transceivers each having a different media access control address
comprises, at one of the transceivers, receiving a signal from the access
point, the signal representing one or more packets of data; determining a
source media access control address for each of the packets; and
transmitting an alert packet to the access point when the source media
access control address of one of the packets is the media access control
address of the transceiver.