The present invention relates to a method, devices, and a program for using IP multicast addresses for mobile terminals (UE) connected to a communication gateway in a wireless communication network. The IP multicast address is used for updating routers in the infrastructure network of where to transport data to the UE when the UE connects to another communication gateway, this may be updated from the new communication gateway or from a mobility management entity relieving a network gateway (e.g. a SAE gateway) of control traffic reducing the risk of bottle necks in the infrastructure network.