A method comprising, at a mobility access gateway on a network domain: receiving a data flow binding : request message from a mobile host device, the data flow binding request message comprising a request that the mobile host device be assigned a common network address for simultaneous use on multiple network interfaces of the mobile host device through which the mobile host device is attached to the network domain and an indication of an existing data flow between the mobile host device and the network domain and of a preferred network interface of the multiple network interfaces of the mobile host device to which the network domain should route the data flow; sending a proxy binding update message to a local mobility anchor, wherein the proxy binding update message comprises an indication that the mobile host device requested to be assigned a common network address for simultaneous use on the multiple network interfaces of the mobile host device; receiving a proxy binding acknowledgement message from the local mobility anchor, wherein the proxy binding acknowledgement message comprises network address information indicating a network address assigned to the mobile host device; extracting the network address information from the proxy binding acknowledgement message; and sending a message comprising the extracted network address information to the mobile host device, the message indicating that the mobile host device has been assigned the network address for simultaneous use on the multiple network interfaces of the mobile host device through which the mobile host device is attached to the network domain. receiving a data flow binding : request message from a mobile host device, the data flow binding request message comprising a request that the mobile host device be assigned a common network address for simultaneous use on multiple network interfaces of the mobile host device through which the mobile host device is attached to the network domain and an indication of an existing data flow between the mobile host device and the network domain and of a preferred network interface of the multiple network interfaces of the mobile host device to which the network domain should route the data flow; sending a proxy binding update message to a local mobility anchor, wherein the proxy binding update message comprises an indication that the mobile host device requested to be assigned a common network address for simultaneous use on the multiple network interfaces of the mobile host device; receiving a proxy binding acknowledgement message from the local mobility anchor, wherein the proxy binding acknowledgement message comprises network address information indicating a network address assigned to the mobile host device; extracting the network address information from the proxy binding acknowledgement message; and sending a message comprising the extracted network address information to the mobile host device, the message indicating that the mobile host device has been assigned the network address for simultaneous use on the multiple network interfaces of the mobile host device through which the mobile host device is attached to the network domain. <EOS>