Patent ID: 8588251

Claim:
A packet transfer apparatus connected to a first communication network over which data communication is performed with a first communication protocol, and a second communication network over which data communication is performed with a second communication protocol, the packet transfer apparatus comprising: a receiving unit that receives a packet of the first communication protocol generated by conversion of a packet of a third communication protocol from the first communication network, a processing unit that converts the received packet of the first communication protocol to a packet of the third communication protocol with terminating the first communication protocol, and converts the packet of the third communication protocol generated by the conversion with terminating the first communication protocol, into a packet of the second communication protocol by adding a header of the packet of the second communication protocol which is generated based on destination information of the received packet of the second communication protocol corresponding to destination information of a header of the received packet of the first communication protocol to the packet of the third communication protocol generated by the conversion with terminating the first communication protocol, and a transmitting unit that transmits the packet of the second communication protocol generated by the conversion to the second communication network.