A connection device for connecting to all bus systems of a motor vehicle is provided for communicating between different vehicle systems and is included in a gateway for the motor vehicle. A computing device designed for controlling the exchange of data between the bus systems is also included in the gateway. The gateway additionally has at least one communication device for wireless Communication in a network having at least one device external to the motor vehicle and the computing device is designed for controlling the data exchange between the several bus systems and the network.