Communication devices, communication systems, communication methods, and programs

Abstract

To determine the appropriate communication path without requiring any effort from the user. [Solution] The table management unit 112 registers a first record in the routing table 50, which is a record that includes the IP address of the first proxy server as the destination network ID, the full-bit subnet mask as the subnet mask, and the identifier of the first communication adapter as the communication adapter identifier, and updates the routing table 50 to indicate the second route, which goes through the second communication network, as the default route, out of the first route which goes through the first communication network and the second route which goes through the second communication network. When the communication unit 113 communicates with a communication partner connected to the communication device 100 via the first communication network, it accesses the first proxy server using the first communication adapter identified by the first record, and communicates with the communication partner via the first proxy server.

Claims

1. A first communication adapter for connecting to the first communication network, which is a mobile phone network, A second communication adapter for connecting to the second communication network, which is a LAN, A storage means for storing a routing table in which records including the destination network ID, subnet mask, and communication adapter identifier are registered, A table management means registers a first record in the routing table, which is a record that includes the IP address of a first proxy server connected to the communication device via the first communication network as the destination network ID, a full-bit subnet mask as the subnet mask, and the identifier of the first communication adapter as the identifier of the communication adapter, and updates the routing table so that the second route, which is a route via the second communication network, is shown as the default route, out of a first route which is a route via the first communication network and a second route which is a route via the second communication network. The system includes a communication means that, when communicating with a communication partner connected to the communication device via the first communication network, accesses the first proxy server using the first communication adapter identified by the first record registered in the routing table, and communicates with the communication partner via the first proxy server. Communication device.

2. The aforementioned communication partner holds the first server certificate and the first root certificate, The storage means stores a first client certificate authenticated by the first root certificate and a second root certificate used for authenticating the first server certificate. The first proxy server holds a duplicate root certificate which is a copy of the first root certificate, The communication means establishes a first encrypted communication between the communication device and the first proxy server, which is encrypted communication using the authentication of the first client certificate by the duplicated root certificate; establishes a second encrypted communication between the communication device and the communication partner, which is encrypted communication using the authentication of the first client certificate by the first root certificate and the authentication of the first server certificate by the second root certificate, via the first encrypted communication; and communicates with the communication partner via the second encrypted communication. The communication device according to claim 1.

3. The aforementioned communication partner holds the second server certificate and the third root certificate, The first proxy server holds the second client certificate, which is authenticated by the third root certificate, and the fourth root certificate and third server certificate used for the authentication of the second server certificate. The storage means stores the fifth root certificate used for authentication of the third server certificate, The communication means establishes a third encrypted communication between the communication device and the first proxy server using authentication of the third server certificate by the fifth root certificate, and establishes a fourth encrypted communication between the first proxy server and the communication partner using authentication of the second client certificate by the third root certificate and authentication of the second server certificate by the fourth root certificate via the third encrypted communication, and communicates with the communication partner via the first proxy server using the third encrypted communication and the fourth encrypted communication. The communication device according to claim 1.

4. The system includes a designation acceptance means that accepts a designation from a user for a second proxy server connected to the communication device via the second communication network, When the designated receiving means receives a designation of the second proxy server, the communication means accesses the second proxy server using the second communication adapter and communicates with the communication partner via the second proxy server without going through the first proxy server. A communication device according to any one of claims 1 to 3.

5. A communication system comprising a communication device, a first proxy server connected to the communication device via a first communication network which is a mobile phone network, and a server connected to the communication device via the first communication network, The aforementioned communication device is A first communication adapter for connecting to the aforementioned first communication network, A second communication adapter for connecting to the second communication network, which is a LAN, A storage means for storing a routing table in which records including the destination network ID, subnet mask, and communication adapter identifier are registered, A table management means registers a first record in the routing table, which is a record that includes the IP address of the first proxy server as the destination network ID, the full-bit subnet mask as the subnet mask, and the identifier of the first communication adapter as the identifier of the communication adapter, and updates the routing table so that the second route, which is a route that goes through the second communication network, is shown as the default route, out of a first route which is a route that goes through the first communication network and a second route which is a route that goes through the second communication network. When communicating with the server, the system includes a communication means that accesses the first proxy server using the first communication adapter identified by the first record registered in the routing table, and communicates with the server via the first proxy server. The first proxy server relays communication between the communication device and the server. Communication system.

6. A first communication adapter for connecting to the first communication network, which is a mobile phone network, A second communication adapter for connecting to the second communication network, which is a LAN, A communication method performed by a communication device comprising: a storage means for storing a routing table in which records including the destination network ID, subnet mask, and communication adapter identifier are registered; A first record is registered in the routing table, which is a record that includes the IP address of the first proxy server connected to the communication device via the first communication network as the destination network ID, a full-bit subnet mask as the subnet mask, and the identifier of the first communication adapter as the identifier of the communication adapter; and the routing table is updated to show the second route as the default route among the first route which is a route via the first communication network and the second route which is a route via the second communication network. When communicating with a communication partner connected to the communication device via the first communication network, the first proxy server is accessed using the first communication adapter identified by the first record registered in the routing table, and communication with the communication partner is performed via the first proxy server. Communication method.

7. A first communication adapter for connecting to the first communication network, which is a mobile phone network, A second communication adapter for connecting to the second communication network, which is a LAN, A computer comprising: a storage means for storing a routing table in which records including the destination network ID, subnet mask, and communication adapter identifier are registered; A table management means registers a first record in the routing table, which is a record that includes the IP address of a first proxy server connected to the communication device via the first communication network as the destination network ID, a full-bit subnet mask as the subnet mask, and the identifier of the first communication adapter as the identifier of the communication adapter, and updates the routing table so that the second route, which is a route via the second communication network, is shown as the default route, out of a first route which is a route via the first communication network and a second route which is a route via the second communication network. When communicating with a communication partner connected to the communication device via the first communication network, the first communication adapter identified by the first record registered in the routing table is used to access the first proxy server, and the communication means is configured to communicate with the communication partner via the first proxy server. program.

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