JPH024059A - Method for updating user registration in electric mail system - Google Patents

Abstract

PURPOSE:To utilize one generating of an unregistered packet to the check and updating of the user registration information every host by broadcast- communicating the packet reception information of a destination address unregistration in adding the latest updating date of a destination address. CONSTITUTION:A host 1 to receive an electronic mail transmits the information, to which at least the registration date where the destination address in the host 1 is registered is added, to every host 1 in a system when the destination address of the electronic mail and the destination address registered in a RAM 11 in the host 1 do not coincide. The host 1 to receive the information, to which the registration date is added, updates the registration information in the host 1 based on the user registration information registered in the host 1 to transmit the information when the registration date in the information and the latest registration date of the user registration information to contain the destination address in the host 1 do not coincide.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for updating user registration in an e-mail system running on a wide area network.

[Conventional technology] An example of a wide area network configuration is shown in FIG.

In FIG. 5, subsystems SA within the three regions,
Sa and Sc are connected to the wide area network NW via respective hosts HA, HB, and HC.

The regional subsystems SA, SB, and So are configured with LANs (local area networks), and a plurality of terminals T are connected to them. Terminal T is connected to host and wide area network N
via W, e-mail communication is performed with terminals T of other intra-area subsystems. A conventional example of the user registration table confirmation/update operation in the above system configuration is shown below.
7 is a flowchart of FIGS. 6 and 7; FIG.

The operation of the receiving host shown in FIG. 6 will be explained first.

When an e-mail is received from the wide area network in step S20, the user registration table in the receiving host is referred to in step S21 to confirm the correctness of the destination of the e-mail.

Then, in step S22, it is checked whether the destination address is registered in the user registration table. If it is registered, the process proceeds to step S23, where it is addressed to the corresponding terminal and transferred onto the LAN.

If the e-mail is not registered, the process proceeds to step S24, where a cause code indicating "no registration" is obtained, and in step S25, a NACK packet with the cause code added is sent to the host that sent the e-mail.

The flowchart in FIG. 7 shows the operation of the transmitting host that received the NACK packet. Upon receiving the NACK packet in step 326, step S2
In step 7, check the cause code added to the packet. If it is a code indicating that it is not registered in the user registration table, step S28 to step S
Proceeding to step 30, the table information update operation begins.

In step S30, a packet requesting user registration table information is sent to the receiving host. Then, the information requested in step S31 is received, and step S32
updates the registration table in the sending host based on that information. This means that the updating of the user registration table in the sending host is completed.

Note that if the code in step S28 is not caused by address registration, a process corresponding to the code will be performed in step S29.

[Problems to be Solved by the Invention] However, in the above conventional example, even if the updating of the user registration table of the sending host is completed, there is a possibility that other hosts still have unupdated user registration tables. If so, the e-mail users of that in-host subsystem will repeatedly make the same address error.

The present invention eliminates the conventional drawbacks and provides a method for updating user registration in an e-mail system that constantly updates user registration information in all hosts connected to the e-mail system to the latest information.

[Means and effects for solving the problem] In order to solve this problem, the user registration update method in the e-mail system of the present invention provides an e-mail update method for e-mail between subsystems connected to a wide area network via a host computer. In an e-mail system that performs communication, if the destination address of the e-mail and the destination address registered in the host do not match, the host that receives the e-mail will check whether at least the destination address in the host is registered. The information with the registered registration date added is sent to all hosts in the system, and the host that receives the information with the registration date added has the latest user registration information including the registration date in the information and the destination address in the host. If the registration dates do not match, the registration information in the host that sent the information is updated based on the user registration information registered in the host that sent the information.

[Embodiment] The system configuration of this embodiment is based on the fifth example already explained in the conventional example.
Although it is the same as the figure, FIG. 1 is a diagram further showing the block configuration inside the host computer of this embodiment. In FIG. 1, 1 is a host computer, 2 is a wide area network, 3 is a wide area network communication control unit that controls communication with the wide area network 2, 4 is a wide area network buffer memory that buffers communication data with the wide area network,
5 is a LAN buffer memory that buffers communication data with the LAN, 6 is a LAN communication control unit that controls communication with the LAN, 7 is a CPU for calculation and processing, 8 is a program memory that stores the control memory of the CPU 7, 9 is CPU (7)
7 - RAM for transfer; 10 is a DMAC 111 for controlling DMA between each memory; RAM for storing a user registration table;
12 represents a LAN cable, and 13 represents a terminal T.

FIG. 2 is a diagram showing the contents of RAM II for storing user tables. 21 is a LAN side address table in which the node address of each terminal is written, and 22 is a wide area network side address in which the wide area network addresses of other hosts connected to the wide area network and the LAN node addresses of the terminals connected to the hosts are written. Table 23 is a cause code table that collects causes when a communication abnormality occurs, 24 is a communication parameter table that describes parameters necessary for communication within the LAN and with the wide area network, 2
5 is an update date history table of the above table information.

The flowcharts in FIGS. 3 and 4 are diagrams showing the operation of the e-mail system of this embodiment with the above configuration.

First, in step S1, an e-mail from the wide area network 2 is received. The destination address of the e-mail stored in the wide area buffer memory 4 through the wide area network communication control unit 3 is confirmed in step S2, and further in the LAN side address table 2 in the user registration table storage RAM II in step S3.
1, it is determined in step S4 whether the destination address is registered in the LAN side address table 21. If it is registered, the process advances to step S5, where the e-mail is sent to the LAN cable 12 and delivered to the destination terminal.

If it is not registered, an unregistered code indicating unregistered is obtained from the cause code table 23 of the user registration table storage RAM 11 in step S6, and an unregistered code indicating unregistered is obtained from the update date history table 25 in step S7.
The latest update date is obtained, and in step S8, the NACK packet with information on the cause code and the latest update date is sent to the work RA.
Generate in Me. Then, in step S9, the NACK
The packets are sequentially transmitted to all hosts connected to the wide area network 2 by broadcast communication.

FIG. 4 is a flowchart showing the operation of the receiving host that receives the broadcast communication. NAC at step S10
When the K packet is received, the additional information of the NACK packet is checked in step Sll to obtain the cause code. If the cause code is not an unregistered code, processing according to the cause code is executed in step S13. If the cause code is an unregistered code for the destination address in step S12, the process advances to step S14 to obtain the latest update date added to the NACK packet, and in step S15, the user registration table storage RAM II is updated. The latest update date of the LAN side address table 21 is obtained from the change date history table 25.

In step S16, step S14. It is checked whether the two latest update dates obtained in S15 match. If they match, updating of the table information is unnecessary; if they do not match, the update operation of the table is started. Step S
At step 17, a packet requesting the LAN side address table 21 within the host is sent to the host that sent the NACK packet. Then, in step S18, the LAN side address table 2I is received from the host in the form of a response,
In step S19, the corresponding user registration table storage RAM II is updated and the process ends.

Through the above operations, hosts that have tables with old user registration table update dates will update their tables one after another.

As explained above, by broadcasting the reception information of packets with unregistered destination addresses with the latest update date of the destination address added, the occurrence of - times of unregistered packets can be reduced to the user registration table information of all hosts. It can be used for checking and updating, and has the effect of preventing the same trouble from occurring.

Note that the additional communication information requires at least the update date, but is not limited to this.

If a user registration table or a LAN side address table is added, there is no need to request information again from the host that sent the NACK packet.

Further, the present invention updates the information of all hosts connected to an e-mail system to the latest information based on the difference in the registration date of destination addresses, and it is obvious that the present invention is not limited to updating destination addresses or user registration tables. It is.

[Effects of the Invention] According to the present invention, it is possible to provide a method for updating user registration in an e-mail system that updates user registration information in all hosts connected to the e-mail system to the latest information.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the internal block configuration of the host computer of this embodiment. FIG. 2 is a diagram of the table configuration of the table storage RAM of this embodiment. FIG. 3 is an operation flowchart of the receiving host of this embodiment. Figure 5 is a system configuration diagram of the e-mail system; Figure 6 is a flowchart of operation of the receiving host in the conventional example; Figure 7 is the sending side in the conventional example. It is an operation flowchart of a host. In the figure, l: host computer, 2: wide area WJ
, 3... wide area network communication control unit, 4... wide area network buffer memory, 5... LAN buffer memory, 6... LA
N communication control unit, 7... CPU, 8... program memory, 9... work RAM, 10... DMAC. 11... RAM for table storage, 12... LAN table, 13... Terminal T.

Claims (1)

[Claims] In an e-mail system that performs e-mail communication between subsystems connected to a wide area network via a host computer, a host that receives an e-mail sends the destination address of the e-mail and the host If the destination address registered in the host does not match, at least information with the registration date added on which the destination address in the host was registered is sent to all hosts in the system, and the information with the registration date added is sent to all hosts in the system. If the registration date in the information does not match the latest registration date of the user registration information including the destination address in the host, the receiving host will update the user registration information registered in the host that sent the information. A method for updating user registration in an e-mail system, the method comprising updating registration information in the host based on the information.