Communication control method, communication control device, and computer program

1. A communication control method which performs route control in a communication system, communication control method comprising

a specific network constituting the Internet;

a first network configured to accommodate a specific device connected to the specific network;

a second network provided between the specific network and the first network;

a network configured to accommodate a processing device and connected to the second network; and

the processing device configured to perform predetermined processing on the basis of a packet transmitted between the specific network and the first network,

the communication control method comprises:

controlling a path so that a first path of the path leading from the first network to the specific network is branched in the second network is set as a path leading to the specific network via the network;

controlling a path so that second path of the path leading from the first network to the specific network is branched in the second network is set as a path leading to the specific network without passing through the network;

a plurality of redirection destinations of at least a part of communication from the specific device is provided in the network and

the communication control method further includes a process of controlling a path so that a tunnel is formed for each redirection destination, and controlling the transferring of a packet to the redirection destination according to the information in the packet sent from the specific device.

2. The communication control method according to claim 1 , wherein

the communication control method further comprising:

controlling a path so that communication leading to the specific network via the first path leads to the processing device.

3. The communication control method according to claim 1 , further comprising:

outputting to the second network first routing information illustrated below using a first routing protocol for controlling a path between the specific network and the first network; and

the first routing information includes information which designates a transmission destination so that at least a part of communication from the specific device is transferred to a relay device connected to the second network; and

the relay device is accommodated the network and sets so that the processing device is designated to a default route such that a packet flows to the processing device.

4. The communication control method according to claim 1 , further comprising:

controlling a path so that a tunnel is formed in a part of the first path,

wherein a packet of communication via the processing device is transferred via the tunnel.

5. The communication control method according to claim 1 , further comprising:

controlling a path in the second network in accordance with second routing information defining a path leading from the specific network to the first network is branched in the second network;

controlling a path so that a third path of the path leading from the specific network to the first network is branched in the second network is set as a path leading to the first network via the network; and

controlling a path so that a fourth path of the path leading from the specific network to the first network to be branched in the second network is set as a path leading to the first network without passing through the network.

6. The communication control method according to claim 5 , further comprising:

controlling a path so that the third path is set as a path leading to a predetermined address space including an address of the specific device via the processing device,

controlling a path so that the fourth path is set as a path leading to the first network in which the predetermined address space is excluded from an address space of the first network.

7. The communication control method according to claim 6 , further comprising:

controlling a path so that the communication leading to the specific device via the third path leads to the processing device.

8. The communication control method according to claim 5 , further comprising:

outputting to the second network second routing information and third routing information illustrated below using a second routing protocol for controlling a path between the specific network and the first network;

the second routing information includes address information indicating an address space of the first network; and

the third routing information includes address information indicating a predetermined address space set to be smaller than the address space of the first network.

9. A communication control device which performs route control in a communication system comprising:

a specific network constituting the Internet;

a first network configured to accommodate a specific device connected to the specific network;

a second network provided between the specific network and the first network;

a network configured to accommodate a processing device and connected to the second network: and

the processing device configured to perform predetermined processing on the basis of a packet transmitted between the specific network and the first network, the communication control device comprising:

a path setting device configured to set a path;

wherein the path setting device controls a path in the second network in accordance with first routing information defining a path leading from the first network to the specific network to be branched in the second network;

wherein the path setting device controls a path so that a first path of the path leading from the first network to the specific network is branched in the second network is set as a path leading to the specific network via the network; and

wherein the path setting device controls a second path of the path leading from the first network to the specific network is branched in the second network is set as a path leading to the specific network without passing through the network;

the network includes a plurality of redirection destinations of at least a part of communication from the specific device: and

the path setting device controls a path so that a tunnel is formed for each redirection destination, and controls the transferring of a packet to the redirection destination according to the information in the packet sent from the specific device.

10. A non-transitory computer readable storage medium that stores program a to be executed by the computer of a communication system comprising:

a specific network constituting the Internet,

a first network configured to accommodate a specific device connected to the specific network,

a second network provided between the specific network and the first network,

a network configured to accommodate a processing device and connected to the second network, and

the processing device configured to perform predetermined processing on the basis of a packet transmitted between the specific network and the first network;

controlling a path in the second network in accordance with first routing information defining a path leading from the first network to the specific network is branched in the second network;

controlling a path so that a first path of the path leading from the first network to the specific network is branched in the second network is set as a path leading to the specific network via the network; and

controlling a path so that a second path of the path leading from the first network to the specific network is branched in the second network is set as a path leading to the specific network without passing through network

a plurality of redirection destinations of at least a part of communication from the specific device is provided in the network, and

the communication control system further includes a process of controlling a path so that a tunnel is formed for each redirection destination, and controlling the transferring of a packet to the redirection destination according to the information in the packet sent from the specific device.