Abstract: A communication packet processing apparatus and method for absorbing coexistence of different methods of communication packet reception processing is provided by the same software. A communication packet processing apparatus for transmitting and receiving packets possesses a communication interface for transmitting and receiving packets and a first table storing correspondent information of the communication interface. The correspondent information includes a method of communication packet reception processing that the communication interface can correspond to. The method of communication packet reception processing includes a first method and a second method. The communication interface operates under one or both of the first method and the second method.

Abstract: The communications between terminals are encrypted, and even a gateway device is permitted to analyze the encrypted communications, thereby to incarnate censorship for the prevention of information leakage. A gateway device 3 prepares a public key and a secret key in a pair on the basis of a public key encryption system, and distributes the public key to terminals 2a-2c which are managed by the gateway device 3. The terminals 2a-2c subject a communication packet to a prior-art common key encryption, and they thereafter encrypt a common key with the public key and bestow the encrypted common key on the packet. The gateway device 3 decrypts the common key by using the secret key, censors the packet and returns the packet into a prior-art encrypted packet format, and it thereafter transfers the packet to a network 1c where opposite terminals 2d-2f exist.

Abstract: In cases where the system which performs service provision includes plural kinds of OS, the plural kinds of OS are operated simultaneously on one standby server provided with the virtual control unit. When a failure etc. occurred in the operation system server necessitates the system switchover from the operation system server to the standby server, the virtual control unit of the standby server distinguishes an operation system server in which the failure has occurred, and takes over the processing to the switching control unit on a suitable OS on the standby server.

Abstract: A service interruption time is shortened in redundancy switching, thereby to render a vocal service of good quality, in addition to a data service of good quality by a server. In case of redundancy switching, an IP filter is set in a standby system server, and the standby system server is given the same IP address as an IP address given to an operation system server and is thereafter shifted into an operating state. On the other hand, the original operation system server deletes the given IP address and is thereafter shifted from an operating state into a standby state. The original standby system server releases the set IP filter, and thereafter starts the provision of a service.

Abstract: In cases where the system which performs service provision includes plural kinds of OS, the plural kinds of OS are operated simultaneously on one standby server provided with the virtual control unit. When a failure etc. occurred in the operation system server necessitates the system switchover from the operation system server to the standby server, the virtual control unit of the standby server distinguishes an operation system server in which the failure has occurred, and takes over the processing to the switching control unit on a suitable OS on the standby server.

Abstract: A service interruption time is shortened in redundancy switching, thereby to render a vocal service of good quality, in addition to a data service of good quality by a server. In case of redundancy switching, an IP filter is set in a standby system server, and the standby system server is given the same IP address as an IP address given to an operation system server and is thereafter shifted into an operating state. On the other hand, the original operation system server deletes the given IP address and is thereafter shifted from an operating state into a standby state. The original standby system server releases the set IP filter, and thereafter starts the provision of a service.

Abstract: The communications between terminals are encrypted, and even a gateway device is permitted to analyze the encrypted communications, thereby to incarnate censorship for the prevention of information leakage. A gateway device 3 prepares a public key and a secret key in a pair on the basis of a public key encryption system, and distributes the public key to terminals 2a-2c which are managed by the gateway device 3. The terminals 2a-2c subject a communication packet to a prior-art common key encryption, and they thereafter encrypt a common key with the public key and bestow the encrypted common key on the packet. The gateway device 3 decrypts the common key by using the secret key, censors the packet and returns the packet into a prior-art encrypted packet format, and it thereafter transfers the packet to a network 1c where opposite terminals 2d-2f exist.