COMMUNICATION SYSTEM, SERVER, AND CLIENT DEVICE

摘要

A communication system includes: a client device and a server. The server can store first address information specifying at least one first global IP address and is configured to: receive, from the client device, an IP packet containing first information and a second global IP address; determine whether the second global IP address coincides with the specified first global IP address; and when the second global IP address coincides with the specified first global IP address, transmit second information to the client device. The client device stores an object program and is configured to: transmit the first information to the server when the client device is in a restricted state in which the client device is not permitted to execute the object program; receive the second information from the server; and cancel the restricted state of the client device when the second controller receives the second information.

主权项

1. A communication system, comprising:
a client device; and a server comprising:
a first communication device configured to be electrically connected with the client device in a method which complies with an IP protocol;a first storage storing first address information specifying at least one first global IP address; anda first controller configured to execute:
a first reception process for receiving an IP packet from the client device via the first communication device, the IP packet containing first information, a second global IP address being set in the received IP packet;a determination process for determining whether the second global IP address set in the received IP packet coincides with one of the at least one first global IP address specified by the first address information; anda second information transmission process for transmitting second information to the client device via the first communication device, when the first controller determines in the determination process that the second global IP address coincides with one of the at least one first global IP address, the client device comprising:
a second communication device configured to be electrically connected with the server connected to the Internet, in a method which complies with the IP protocol;a program storage configured to store an object program; anda second controller configured to execute:
a first information transmission process for transmitting the first information to the server via the second communication device when the client device is in a restricted state in which the client device is not permitted to execute the object program;a second reception process for receiving the second information from the server via the second communication device; anda restriction cancellation process for canceling the restricted state of the client device, when the second controller receives the second information in the second reception process.