Large scale mobile network address translation

It is a method and a device which make it possible to transmit a move machine (MS) to another NAT domain from a certain network-address-translation (NAT) domain. A dynamic rule generated in the 1st NAT domain is transmitted to the 2nd NAT domain through a media policy routing function. In order to transmit MS session, a tunnel is generated between the 2nd NAT domain and the 1st MPR. If the new session from MS is generated outside a tunnel and MS session times out, All the State that exists in the 2nd NAT domain that uses the new set of a dynamic NAT rule generated in MS session, and the 1st MPR and the 2nd NAT domain is removed. And a tunnel is removed and use of communication which led the 2nd MPR and the 2nd NAT domain is attained.