Method and apparatus for use in a communications network

Method and apparatus in a communication network, wherein the mobile node via a proxy node access the communication network. Acting on behalf of the mobile node is arranged to handle mobility signaling node. In the first care-of address such as a mobile anchor function of the local mobility anchor and the like, registered with the mobile node is associated. When the mobility anchor function receives a registration request for a second care-of address registered with the mobile node is associated, it sends a request message to the proxy node on behalf of the mobile node act. The request message indicates whether the check using the first proxy node care-of address can reach the mobile node.