Mobility and physical-layer protection is one of the challenging research issues in vehicular ad-hoc network. A NEtwork MObility (NEMO)-based Vehicular Ad hoc NETwork (VANET) is a new approach to integrate the NEMO protocol with VANETs. This integration supports communications between Road Side Units (RSUs) and vehicles and provides Internet access through public hotspots located inside public transportation systems. Passengers inside these public transportation systems enjoy full Internet access by using different Mobile Network Nodes (MNNs), such as cell phones and personal digital assistants. Physical-layer attackers can easily localize the MNNs by measuring their Received Signal Strength (RSS).