Port Stealing
Is a technique for attachment to the layer 2 E thernet in local networks LAN switched (i.e. with switch) which has as its purpose to intercept packets destined for another host through the theft of the respective switch port. Port Stealing Scheme When a switch receives a packet on a port performs the backward learning, stores in a CAM the association between the source MAC of the packet and the port from which this package arrives . In this way when you receive the response packet will send it only on the port to which the source is connected. This process is free of security mechanisms for which anyone connected to the same switch can send a packet with the Mac to another host to receive and sniffing his return traffic. The port stealing consists precisely in the send packets with the Mac to another host with the intention of creating a false entry in CAM (the port is "stolen", port-stealing means precisely the theft of the door). This technique is
