JP2001203760A - Address exchange system between networks in different address system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize connection through the user of an address after it is transferred on communication data between networks different in address system. SOLUTION: A server which is to transfer the address by communication data decides whether a terminal which is to attain a connection by using the transferred address is in the network of the address system the same as that of the server or in the network of a different address system across an address conversion device and the address of the address system the same as that of the terminal is transferred. Thus, the pertinent terminal can realizes connection based on the transferred address.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an address system for managing a department server which manages addresses of all department servers and which department servers have what information and functions. The present invention relates to an optimum data notification method in a system for notifying a client of an address of a department server on communication data of an application over different network areas.

[0002]

2. Description of the Related Art Conventionally, instead of an address from a central server, a name is passed on a communication data of an application to a client in a network having an address system different from the network in which the server exists, and the name is sent to a name server in a client-side network A setting that enables the connection of the connection from the client to the server by setting so that the name on the network side with the server can be resolved beyond the address translator between the networks with two different address systems. Had gone.

[0003]

In the above prior art, it is assumed that the two networks have the same name system, that is, there is no duplication of names between the two networks, and consideration is given to duplication of names. There was no problem.

[0004] For example, as a condition under which a client can connect to a department server, in the example of the prior art described above, there is a condition that there is no terminal having the same name as the desired department server in the global network. That is,
If a terminal having the same name already exists in the global network, it becomes impossible to make settings so that the name of the department server in the private network can be resolved by the name server in the global network. The connection from the client to the department server becomes impossible.

An object of the present invention is to allow a client to connect a connection to a department server by passing the address of the department server on application data even if a name is duplicated between networks having two different address systems.

[0006]

In order to achieve the above-mentioned object, the general server which passes the address of the department server to which the client wishes to connect in the form of application data to the client uses the first connection from the client or the first connection from the client. By the notification from the department server that received the connection, the client address is
Judge whether the address is under the address system of the network where the central server is located, or whether it is an address under an address system different from that of the network with the central server. In the latter case, the address of the department server, which is seen from the outside of the address translator, is loaded on the application data and passed directly to the client or via the department server which has first received the connection.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a system configuration on which the present invention is performed. A network A (101) and a network B (120) having different address systems are connected by an address translator (13), and a server group including a central server (10), a department server A (11), and a department server B (12) and a client. (14) exists in different networks having different address systems. FIG. 2 shows one embodiment of the present invention. FIG. 3 is an overall system service information management table of the central server in this embodiment. FIG. 4 is a data format of an inquiry to the central server in this embodiment.
5 is a flowchart for explaining the logic of the determination mechanism of the central server in the present embodiment.

[0008] As an inquiry to the central server, there is a service request from the department server, and the service cannot be provided by the department server. Therefore, there are cases where the department server inquires about which department server can provide the service to the central server. It is conceivable that the client directly inquires about the department server that can provide the service to the general server.

First, the operation on the department server side will be described. The service request to the department server is accepted using the data transmission / reception unit (201) of the department server. The received service request is sent to the data extracting / creating unit (20
The service is taken out using the section 2), and the section service information management section (2)
04), it is confirmed whether the requested service can be provided by the department server. If the requested service can be provided by the department server, the service is executed by the service execution unit (203),
After creating the service response by the creating unit (202), the data transmitting / receiving unit (201) returns a response to the service request.
If the requested service cannot be provided by the department server, a data inquiry / creation unit is used to create a service inquiry (202), and then a data transmission / reception unit (201)
Sends a service inquiry to the master server. At this time, the functions newly required on the department server side in the present invention are the indirect inquiry flag set and the inquiry source IP address set when the service inquiry is created by the data extracting / creating unit (202) in FIG. When creating a service inquiry in the data extracting / creating unit (202), the IP address of the request source is detected based on the IP header of the service request data to the department server, and the “inquiry source” of the application data of the service inquiry in FIG. "IP address" part (402) At the same time as setting the IP address of the client, the "indirect inquiry flag" is turned on (401).

On the central server side, after the data transmission / reception unit (205) receives the inquiry, the data retrieval / creation unit
At (206), the service inquiry data is extracted and passed to the judgment mechanism (207). The operation of the determination mechanism will be described with reference to FIG. The determination mechanism refers to the “indirect inquiry flag” (401) of the application data of the inquiry. If the flag is ON (branch to NO in 51), the “inquiry source” of the application data of the inquiry is used as the IP address of the client. IP address "(402)
Is taken out (52). If the indirect inquiry flag is OFF (branch to YES in 51), the IP address of the client is set via the transport layer API.
The source IP address in the P header is taken out (53), and the judgment mechanism (207) is used by the system service information management unit (2).
08), an inquiry is made as to which server provides the inquiry service. At this time, as shown in FIG. 3, in the all system service information management table of the all system service information management unit, the IP address corresponding to the server is: It has an internal IP address and an external IP address. The IP address of the client obtained in the above procedure is the internal IP
In the case of the address (YES branch of 54), the internal IP address is selected as the response data from the all system service information management table, and in the case of the external IP address (N of 54).
Branch to O), select an external IP address as response data from the all system service information management table, create a service inquiry response in the data extracting / creating unit (206), and then inquire the service in the data transmitting / receiving unit (205). Respond to The internal IP address and the external IP address are, for example, a private address and a global address, respectively. Private address is 10.0.0.0 defined in RFC1597 among IP addresses.
~ 10.255.255.255,172.16.0.0 ~ 172.31.255.255,192.
Indicates 168.0.0 to 192.168.255.255.

FIG. 6 shows an example of a system as a premise of the present invention and a network configuration for explaining how the present invention is used. The client 54 in the global network 620, the central server 60 in the private network 610, the department server A6
1, department server B62, global network 620
And a private network 610. The client 64 communicates with the department server A61 (60
1). If the department server A61 does not have the information and functions required by the client 64, the department server A61
An inquiry is made as to which department server has the information and function necessary for 0 (602). At this time, the department server 61 uses the logic 66 for extracting the source IP address via the API, extracts the IP address IP-E of the client 64, puts it on the application data, and passes it to the central server 60. The general server 60 indicates that the department server to be sought is the department server B62 by setting the IP address IP-B of the department server B62 on the application data.
1 is transmitted by transmitting the message (603). At this time, the department server B62 passed to the department server A61
Of the IP address is determined to be a private address or a global address visible from the global network by using the determination mechanism 65. In this example, since the IP address IP-E of the client is a global address, the IP address of the department server B62 passed to the department server A11 is IP-B. Thereafter, the department server A61 receives the department server B received from the central server 60.
The IP address 62 is notified to the client 64 using the application data. (604) As a result, the client 64 transmits the IP address of the department server B62 notified from the department server 61 on the application data.
It is possible to connect to the department server B62 based on the address IP-B (605).

FIG. 7 shows another example of a system on which the present invention is based, and a network configuration for explaining how the present invention is used. The client 74 in the global network 720, the central server 70 in the private network 710, the department server A7
1, department server B72, global network 720
And a private network 710. When the client 74 directly inquires of the department server that the requested information and function are located in the department server 70 (701), the department server B72 also determines that the department server to be sought is the department server B72. IP
Client 7 in the address on the application data
4 is transmitted (702). At this time, the department server B7 notified to the client 74
The IP address 2 determines whether it is a private address or a global address visible from the global network using the determination mechanism 75. The IP address of the client 74 required for the determination mechanism 75 to determine is the source IP address extracted by the determination mechanism 75 via the API. In this example, the client IP address I
Since PE is a global address, client 7
The IP address of the department server B72 passed to No. 4 is the global address IP-B. As a result, the client 74 sends the department server B notified from the
It is possible to connect to the department server B72 based on the IP address IP-B of 72 (703).

In FIG. 6 and FIG. 7, the IP-PC is the private address of the central server, IP-PA, IP-PB.
Indicates the private addresses of the department server A and the department server B, respectively. In addition, IP-C is a global address of the central server that can be seen from outside the address translator,
-A and IP-B indicate the global addresses of the department server A and the department server B, respectively, which can be seen from outside the address translator. IP-E is the global address of the client.

[0014]

According to the present invention, when a client communicates with a group of servers via an address translator between networks having different address systems, one of the group of servers can be connected without knowing which department server the client should connect to. It is possible to receive an address to be connected using application data and to connect to a specific server again using that address, regardless of the address system in the server group and client network. It is to be.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram on which the present invention is premised.

FIG. 2 is an explanatory diagram of one embodiment of the present invention.

FIG. 3 is a view showing an overall system service information management table of the central server.

FIG. 4 is a diagram showing a data format of an inquiry to a central server.

FIG. 5 is a diagram showing logic of a determination mechanism of the central server.

FIG. 6 is a diagram showing an example of a system image according to the present invention.

FIG. 7 is a diagram showing an example of a system image of the present invention.

[Explanation of symbols]

201/205: data transmission / reception unit, 202/206: data extraction / creation unit, 204: department service information management unit, 208: all system service information management unit, 203 ...
Service execution unit, 207: judging mechanism, 60, 70: general server, 61, 62, 71, 72: department server, 63
73 ... address translator, 64/74 ... client,
65/75: determination mechanism, 66: inquiry IP address information set unit, 610/710: private network, 620/720: global network.

Claims (1)

[Claims] In a client / server system in which a plurality of servers are available from a client and an integrated server that manages addresses of the servers and services provided by the servers is provided, even if the client and server address systems are different, the client Is an address notification method that can connect to an appropriate server based on an inquiry to the central server.