JPH05197657A - Logical address inspecting system - Google Patents

Abstract

PURPOSE:To investigate whether an address allocated to a computer can be used or not when newly adding the computer to a network. CONSTITUTION:Address numbers making the inspection data transmission request parts of a computer 1 empty are simultaneously broadcasted through a communication control program 7 to a network 4. When the address is coincident to that of the own station, the other computer receiving this information transmits it by a use inhibit data transmission request part 11 that the address can not be used. The computer 1 receiving this information displays a use inhibit message.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a logical address checking system for checking a logical address used on a network constructed by a computer.

[0002]

2. Description of the Related Art Conventionally, "a non-rewritable physical address for making a computer on a network physically unique" and "a rewritable logical address for logically constructing and managing a network" are As a result of the correspondence, in a network constructed by a computer on which a "communication control program for identifying a communication partner computer by a logical address" operates, the logical address is "an arbitrary logical address that does not exist in the above-mentioned network for a computer user or It is determined and set by a manual search by the network administrator.

[0003]

However, according to such a conventional method, when a new computer is added to the already constructed local area network,
The user of the newly added computer or the network administrator must search for a logical address that is not currently used and set it in the newly added computer. However, at this time, if there is an error or omission in the original information obtained by retrieving the logical address that is not currently used, there may occur a state in which there are a plurality of computers holding the same logical address on the network. In such a case, not only the newly added computer cannot perform normal communication, but also the computer having the same logical address that existed earlier may not be able to perform normal communication. Was there.

[0004]

A non-rewritable physical address for making a computer on a network physically unique and a rewritable logical address for logically constructing / managing a network are made to correspond to each other. By
In the computer connected to the network where the communication control program that identifies the communication partner computer by the logical address operates, the logical address check data that uses the data type, the own station logical address, and the own station physical address as data is sent to the communication control program. A test data transmission request unit that requests transmission all at once in the network, a data reception unit that receives the test data sent via the network from the communication control program, and a logical address in the received logical address test data And a logical address inspection unit that inspects whether the own station logical address is the same address,
If the logical address in the received logical address check data is the same as the own station's logical address, the prohibited data that requests the communication control program to send the logical address use prohibition data to the physical address in the logical address check data A transmission request unit and a message display unit for displaying a logical address use prohibition message are provided.

[0005]

When adding a computer to the network 4, when the computer 1 tries to check the logical address, the computer 1 sets a logical address which does not exist in the network, and the inspection data transmission requesting unit 8 sets the logical address. Is simultaneously requested as a logical address check data. As a result, the logical address check data is broadcast at the same time. To explain the computer 3, for example, the logical address check unit 1
0 is the source logical address 2 in the logical address check data
0 is compared with the own station logical address. If they match, the communication control program 7 of the computer 3 requests the prohibition data transmission request unit 11 to transmit the logical address use prohibition data to the computer 1 having the transmission source physical address 19 in the logical address check data. As a result, the computer 1 receives the logical address use prohibition data, and the data receiving unit 9 notifies the message display unit 12 of it.
Therefore, the message display unit 12 displays a logical address use prohibition message on the display 5.

[0006]

[Embodiment] In the case where the present invention is realized as "a host program of a data link layer program on a computer connected to a network constructed by Ethernet", a logical address check data transmission request is made by input from a keyboard. Will be described as an example with reference to the drawings.

FIG. 1 is a functional block diagram of an embodiment of the present invention, FIG. 2 is a frame format of a data link layer, FIG. 3 is logical address check data, and FIG. 4 is logical address use prohibition data. Now, in the case of adding a computer to the network 4, a case will be described in which an arbitrary address not existing in the network is given to the additional computer. This is started by using the input of the processing start request from the keyboard 6 as the activation factor. For example, when an address not existing in the network is to be given to the additional computer, the inspection data transmission request unit 8
Performs the following processing.

"Logical address inspection data transmission process" The inspection data transmission requesting unit 8 transmits a "logical address whose transmission data is the data type 18, own station physical address 19, own station logical address (source logical address) 20 in FIG. examination data"
Is sent to the communication control program 7 at the same time, and at the same time, a timer request is made for a fixed time. The communication control program 7 that has received the transmission request transmits the frame of the logical address check data shown in FIG.

"Logical address check data reception processing" The logical address check data sent via the network 4 is received by the communication control program 7 from the upper layer protocol number (FIG. 2) 15 of the received frame. If it is determined that the “upper program to be delivered” is the program of the present invention, the communication control program 7 operates the data receiving unit 9 to deliver the received data to the data receiving unit 9. The data receiving unit 9 determines from the data type 18 in the delivered data whether it is the logical address check data or the logical address use prohibition data, and if it is the logical address check data, the logical address check unit 10 Is operated to deliver this data to the logical address inspection unit 10.

The logical address inspecting unit 10 inspects whether or not the logical address 20 in the delivered logical address inspecting data coincides with the address of its own station, and if not, discards this data. The communication control program 7 on the computer 3 performs the following processing by using the reception of the frame by the computer 3 connected to the computer 1 and the network 4 as an activation factor.

"Logical address use prohibition data transmission process"
Upper layer protocol number on received frame (Fig. 2) 1
When the communication control program 7 determines from 5 that the "upper program to which the received data should be delivered" is the program of the present invention, the communication control program 7 causes the data receiving unit 9 to operate, and the received data is sent to the data receiving unit 9. hand over. The data receiving unit 9 judges from the data type (FIG. 3) 18 in the delivered data whether it is the logical address check data or the logical address use prohibition data. The address check unit 10 is operated, and this data is delivered to it.

The logical address checking unit 10 checks whether or not the logical address 19 in the delivered logical address checking data matches the own station logical address, and if they match, the prohibition data transmission requesting unit 11 is operated and the logical address is checked. At the same time as requesting the transmission of the prohibited data, the logical address check data is delivered. The prohibited data transmission request unit 11 requests the communication control program 7 to transmit the logical address prohibited data addressed to the computer 1 having the source physical address 19 in the delivered logical address check data.

The communication control program 7, which has received the logical address use prohibition data transmission request, transmits a logical address use prohibition frame addressed to the computer 1 to the network 4. When the computer 1 connected to the computer 3 via the network 4 receives a frame as an activation factor, the communication control program 7 on the computer 1 performs the following processes.

"Reception processing of logical address use prohibited data"
The communication control program 7, which determines from the upper protocol number 15 of the received frame that the “upper program to which the received data should be delivered” is the program of the present invention,
The data receiving unit 9 is operated to deliver the received data to the data receiving unit 9. The data receiving unit 9 judges from the data type (FIG. 4) 21 in the delivered data whether it is the logical address check data or the logical address use prohibition data, and if it is the logical address use prohibition data, Is canceled and the timer set when the logical address check data transmission request is released. In addition, the message display unit 12
To request the display of the logical address prohibition message.

The message display unit 12 displays a logical address use prohibition message on the screen of the display 5. The computer 1 uses the timeout of the timer set when requesting the transmission of the logical address check data as the activation factor.
The inspection data transmission request unit 8 above performs the following processing.

[Timeout Processing] If no logical address use prohibition is notified from any computer on the network 4, the message display unit 12 is operated to request the display of the logical address use permission message. The message display unit 12 displays a logical address use permission message on the screen of the display 5.

[0017]

As described above, according to the present invention, one computer inquires of another computer whether or not a logical address may be used, and the computer inquired when the own station is using it. The computer that made the inquiry informs that the logical address should not be used, and the computer that receives the information indicates that the logical address cannot be used. Therefore, multiple computers using the same logical address on the network. It is possible to prevent a network communication failure that occurs due to the existence of the.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a frame format of a data link layer in a network constructed by Ethernet.

FIG. 3 is a diagram showing logical address check data.

FIG. 4 is a diagram showing logical address use prohibition data.

[Explanation of symbols]

 1, 2 and 3 computer 4 network 5 display 6 keyboard 7 communication control program 8 inspection data transmission request section 9 data receiving section 10 logical address inspection section 11 prohibited data transmission request section 12 message display section

Claims (1)

[Claims] 1. Communication is performed by associating a non-rewritable physical address for making a computer on a network physically unique with a rewritable logical address for logically constructing and managing a network. In a computer connected to a network in which a communication control program for identifying a partner computer by a logical address operates, logical address check data having data of a local station logical address and a local station physical address for the communication control program is stored in the network. An inspection data transmission requesting unit for requesting simultaneous transmission to the device, a data receiving unit for receiving the data sent via the network from the communication control program, and a logical address in the received logical address inspection data. Check if the local logical address is the same address If the logical address in the received logical address check data and the own station logical address are the same, the logical address check unit communicates the request to send the logical address use prohibition data to the physical address in the logical address check data. A logical address inspection method comprising: a prohibited data transmission requesting unit for a control program; and a message display unit for displaying a logical address use prohibition message.