Patent ID: 7760674

Claim:
A translator connected to a first network for transferring data in a first protocol and a second network for transferring data in a second protocol, the translator connected to a translation server connected to the first network and the second network and a third network for transferring data in the first protocol, and to a first terminal which has moved from the third network to the first network, and to a second terminal in the second network, the translation server being connected to another translator, which is connected to the second network and the third network, comprising: an interface for receiving a packet from the first terminal according to the first protocol, and sending the packet to the second terminal according to the second protocol, wherein the translator sends a translation informing query to the translation server upon receiving the packet from the first terminal, receives translation information from the translation server, updates an address of the first terminal in the translation information using a source address in the packet, and translates a destination address of the packet according to the translation information before sending the packet to the second terminal, the translation information in the translation server is sent from said another translator, and the translation information is exchanged between the translator and said another translator via the translation server.