A wireless communication system for a moving vehicle, said wireless communication system comprising: a plurality of routers (3; 200-203; 303), each router being configured to: receive and transmit wireless data communication to and from a stationary communication server outside said moving vehicle through at least one exterior mobile network via at least one antenna, wherein said at least one exterior mobile network provides at least one data link; receive and transmit data packets to and from at least one client onboard the moving vehicle; communicate with every other router (3; 200-203; 303) in said moving vehicle in order to receive and transmit data packets to and from said every other router, thereby forming an onboard router network; characterized in that each router (3; 200-203; 303) is arranged to receive a media access control address, MAC address, from any client connecting to the onboard router network, and in that each router is provided with a set of MAC address representations, representing MAC addresses to accept or to ignore, wherein each router (3; 200-203; 303) is arranged to analyze said received MAC address and compare it to its set of MAC address representations, and to determine, based on said analysis whether to accept or ignore said client, wherein the sets of MAC address representations for the different routers are mutually exclusive, whereby a client can only be accepted by one router in the onboard router network, and in that the system further comprises a controller, wherein the sets of MAC address representations is created by the controller, and wherein the controller is arranged to detect malfunction of any of the routers (3; 200-203; 303) in the onboard router network, and upon detection of a malfunctioning router, being arranged to create an updated set of MAC address representations for the remaining at least one router. a plurality of routers (3; 200-203; 303), each router being configured to: receive and transmit wireless data communication to and from a stationary communication server outside said moving vehicle through at least one exterior mobile network via at least one antenna, wherein said at least one exterior mobile network provides at least one data link; receive and transmit data packets to and from at least one client onboard the moving vehicle; communicate with every other router (3; 200-203; 303) in said moving vehicle in order to receive and transmit data packets to and from said every other router, thereby forming an onboard router network; receive and transmit wireless data communication to and from a stationary communication server outside said moving vehicle through at least one exterior mobile network via at least one antenna, wherein said at least one exterior mobile network provides at least one data link; receive and transmit data packets to and from at least one client onboard the moving vehicle; communicate with every other router (3; 200-203; 303) in said moving vehicle in order to receive and transmit data packets to and from said every other router, thereby forming an onboard router network; characterized in that each router (3; 200-203; 303) is arranged to receive a media access control address, MAC address, from any client connecting to the onboard router network, and in that each router is provided with a set of MAC address representations, representing MAC addresses to accept or to ignore, wherein each router (3; 200-203; 303) is arranged to analyze said received MAC address and compare it to its set of MAC address representations, and to determine, based on said analysis whether to accept or ignore said client, wherein the sets of MAC address representations for the different routers are mutually exclusive, whereby a client can only be accepted by one router in the onboard router network, and in that the system further comprises a controller, wherein the sets of MAC address representations is created by the controller, and wherein the controller is arranged to detect malfunction of any of the routers (3; 200-203; 303) in the onboard router network, and upon detection of a malfunctioning router, being arranged to create an updated set of MAC address representations for the remaining at least one router.