The invention relates to a network and to a method of operating a network. The network comprises a plurality of stations each able to transmit and receive data so that the network can transmit data between stations via at least one selected intermediate station. The network further comprises a plurality of levels of stations including a first level comprising user and/or seed stations, a second level comprising auxiliary stations providing access to auxiliary networks, a third level comprising at least one location management station, and a fourth level comprising at least one authentication station. The method comprises transmitting, from or on behalf of a station on the first level requiring authentication, to an authentication station via one or more stations, an authentication request message. In response, the authentication station transmits authentication data to authenticate the station on the first level.