Abstract: Methods and systems are provided for identifying, to an external device, a client device having an external IP address assigned by a Network Address Translation (NAT) device. Initially, the NAT device provides an external IP address assigned to a client device to access an external device. Upon the client device communicating with the external device, the NAT device also provides an internal IP address assigned to the client device in an option field of the external IP address. If the external device later requests to communicate with the client device, and includes in the request the internal IP address in the option field of the external IP address assigned to the client device, the NAT device checks for sessions mapping to the client device. Upon determining there are no sessions mapped to the client device, a new connection is opened to the client device utilizing the internal IP address.

Abstract: Disclosed is a method and system to help better manage resources when a mobile terminal is roaming while within a home-carrier coverage hole or while otherwise threshold close to home carrier coverage. In accordance with the disclosure, a mobile terminal's home carrier will determine that the mobile terminal is being served by a roaming carrier's cell site that is threshold close to a home carrier's cell site, and the home carrier will responsively assign to the mobile terminal an IP address that the home carrier is configured to block.