A method for controlling a network system, the network system comprising a wireless network including a plurality of access points to which one or more clients (107, 109, 111, 113) are connected wirelessly, and a backbone network to which the access points and a client control device are connected, comprising the steps of: - establishing tunnels (123, 125, 127, 129) between the client control device and a respective client (107, 109, 111, 113) via the backbone network, via one of the access points and via the wireless network for transferring data; - receiving, by the client control device, Ethernet telegrams and/or Ethernet packets transmitted by the client via the tunnel, and bridging the Ethernet telegrams and/or Ethernet packets into the backbone network; - receiving, by the client control device, Ethernet telegrams from the backbone network, and delivering the Ethernet telegrams to the client via the tunnel; wherein in logical terms the client control device is a switch with a tunnel end point as a switch port; - transmitting status information from the client (107, 109, 111, 113) to the client control device via the tunnel (123, 125, 127, 129); - evaluating the transmitted status information by the client control device; - transmitting, in dependence of the evaluated status information, a control signal for controlling a transmission power of the client (107, 109, 111, 113), a roaming threshold, or the types of modulation to be used by the client (107, 109, 111, 113), from the client control device to the client (107, 109, 111, 113) via the tunnel (123, 125, 127, 129); - connecting an end subscriber (131, 133) to at least two clients and thus, via the corresponding at least two tunnels, to the client control device; - deciding, by the client control device, to enable one of the redundant tunnel connections on the basis of diagnostic data or quality data for transmitting data from the end subscriber to a receiver in the backbone network; - transmitting control signals to the clients for executing the enabling. - establishing tunnels (123, 125, 127, 129) between the client control device and a respective client (107, 109, 111, 113) via the backbone network, via one of the access points and via the wireless network for transferring data; - receiving, by the client control device, Ethernet telegrams and/or Ethernet packets transmitted by the client via the tunnel, and bridging the Ethernet telegrams and/or Ethernet packets into the backbone network; - receiving, by the client control device, Ethernet telegrams from the backbone network, and delivering the Ethernet telegrams to the client via the tunnel; wherein in logical terms the client control device is a switch with a tunnel end point as a switch port; - transmitting status information from the client (107, 109, 111, 113) to the client control device via the tunnel (123, 125, 127, 129); - evaluating the transmitted status information by the client control device; - transmitting, in dependence of the evaluated status information, a control signal for controlling a transmission power of the client (107, 109, 111, 113), a roaming threshold, or the types of modulation to be used by the client (107, 109, 111, 113), from the client control device to the client (107, 109, 111, 113) via the tunnel (123, 125, 127, 129); - connecting an end subscriber (131, 133) to at least two clients and thus, via the corresponding at least two tunnels, to the client control device; - deciding, by the client control device, to enable one of the redundant tunnel connections on the basis of diagnostic data or quality data for transmitting data from the end subscriber to a receiver in the backbone network; - transmitting control signals to the clients for executing the enabling.