Communications relay device, communications relay method, communications terminal apparatus and program storage medium

A communications relay method in a communications relay device for implementing relay processing between an external network and a local network in which a plurality of control terminals are connected to the local network, said method comprising:

• controlling a first session status of a first data communication session on a first of the plurality of control terminals in which data associated with the first session is received from the external network via the communications relay device;
• controlling access to the first session in accordance with a processing request received from one of the control terminals and a session control table, the session control table including each session status for each data communication session on each of the control terminals in which data associated with the respective session is received from the external network via the communications relay device, each session status in the session control table including at least one permit address, each permit address corresponding to a respective one of the control terminals permitted to receive data associated with the respective session;
• and
• converting a destination address of data associated with the first session and received from the external network via the communications relay device, wherein:
• the step of controlling the first session status comprises, when the processing request is a resume request, rewriting the first session status in the session control table in accordance with the processing request from said one control terminal when the one control terminal providing the processing request corresponds to the at least one permit address of the first session status, and generating an address rewrite processing request, and
• the step of converting a destination address comprises rewriting the destination address of the data associated with said the first session based on the address rewrite processing request.

A communications terminal device for receiving data by way of a communications relay device, said communications relay device being operatively connected between an external network and a local network in which a plurality of control terminals are connected, the communications relay device including:

• session control means for controlling a first session status of a first data communication session on a first of the plurality of control terminals in which data associated with the first session is received from the external network and for controlling access to the first session in accordance with a processing request received from one of the control terminals, the session control means has a session control table that includes each session status for each data communication session on each of the control terminals in which data associated with the respective session is received from the external network via the communications relay device, each session status in the session control table including at least one permit address, each permit address corresponding to a respective one of the control terminals permitted to receive data associated with the respective session;
• and
• address conversion means for converting a destination address of data associated with the first session and received from the external network via the communications relay device, wherein:
• when the processing request is a resume request, said session control means rewrites the first session status in the session control table in accordance with the resume request from said one control terminal when the one control terminal providing the processing request corresponds to the at least one permit address of the first session status, and outputs an address rewrite processing request to said address conversion means, and said address conversion means rewrites the destination address of the data associated with the first session based on the address rewrite processing request from said session control means, and
• wherein said communications terminal device is the one control terminal operatively configured to output to said communications relay device the resume request as the processing request.

A program storage medium for providing a computer program for executing relay processing between an external network and a local network on a computer system, the computer system comprising a plurality of control terminals connected to the local network, wherein said computer program comprises:

• controlling a first session status of a first data communication session on a first of the plurality of control terminals in which data associated with the first session is received from the external network via the communications relay device;
• receiving a processing request from one of the control terminals;
• controlling access to the first session in accordance with the processing request and a session control table, the session control table including each session status for each data communication session on each of the control terminals in which data associated with the respective session is received from the external network via the communications relay device, each session status in the session control table including at least one permit address, each permit address corresponding to a respective one of the control terminals permitted to receive data associated with the respective session;
• and
• converting a destination address of data associated with the first session and received from the external network via the communications relay device, wherein:
• the step of controlling the first session status comprises rewriting the first session status in the session control table in accordance with the processing request from said one control terminal when the one control terminal providing the processing request corresponds to the at least one permit address of the first session status, and generating an address rewrite processing request, and
• the step of converting a destination address comprises rewriting the destination address of the data associated with the first session based on the address rewrite processing request.

A communications relay device operatively connected between an external network and a local network in which a plurality of control terminals are connected, the communications relay device comprising:

• memory storing a session control table that includes each session status for each data communication session on each of the control terminals in which data associated with the respective session is received from the external network via the communications relay device, each session status in the session control table including at least one permit address, each permit address corresponding to a respective one of the control terminals permitted to receive data associated with the respective session;
• a controller operatively configured to control a first session status of a first data communication session on a first of the plurality of control terminals in which data associated with the first session is received from the external network, and to control access to the first session in accordance with a processing request received from one of the control terminals and the session control table;
• and
• address conversion means for converting a destination address of data associated with the first session and received from the external network via the communications relay device, wherein:
• when the processing request is a resume request, said controller rewrites the first session status in the session control table in accordance with the resume request from said one control terminal when the one control terminal providing the processing request corresponds to the at least one permit address of the first session status, and outputs an address rewrite processing request to said address conversion means, and said address conversion means rewrites the destination address of the data associated with the first session based on the address rewrite processing request from said session control means.