Control apparatus, communication apparatus and control method

A communication apparatus comprising:

• a network interface configured to couple a first network included in a plurality of networks, the plurality of networks coupling each other via a plurality of relaying apparatus;
• and
• a processor configured to:
• detect a beginning of communication performed by a specific terminal that is provided with a first address from the first network and couples to a second network in the plurality of networks using a second address provided from the second network, and
• transmit a request packet for controlling at least one relaying apparatus so that a packet addressed to the first address is relayed to the second address, the at least one relaying apparatus being the plurality of relaying apparatus that lies between the communication apparatus and the specific terminal that couples to the second network.

A control method comprising:

• coupling, by a specific terminal, to a second network in a plurality of networks including a first network, the plurality of networks coupling each other via a plurality of relaying apparatus, the first network including a communication apparatus that receives a packet addressed to a first address and transmits the received packet to a second address, the first address being provided for the specific terminal from the first network, the second address being provided for the specific terminal from the second network when the specific terminal couples to the second network;
• identifying, by a control apparatus, at least one relaying apparatus from among the plurality of relaying apparatus, the at least one relaying apparatus lying between the communication apparatus and the specific terminal that couples to the second network;
• and
• transmitting at least one control packet from the control apparatus to the at least one relaying apparatus, the at least one control packet controlling the at least one relaying apparatus so that a packet addressed to the first address is relayed to the second address.