JP5266997B2 - Network connection station information output device, network connection station information output method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically detect an IP address of an instrument linked to a network and to easily determine whether or not the instrument is a target to be connected. <P>SOLUTION: A device includes: a search address generating means 201 for generating a search address for searching the instrument connected to the network by use of its own network logic address; a physical address collecting means 202 for collecting a network physical address of the instrument correlating with this search address; an address determining means 203 for determining whether or not the collected network physical address satisfies the predetermined extraction condition; and an output means 204 for outputting the search address as a network logic address corresponding to the network physical address when it is determined by the address determining means 203 that the network physical address satisfies the extraction condition. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a network connection station information output device, a network connection station information output method, and a program for automatically detecting a network logical address of a connection target device among an unspecified number of devices connected to a network.

  In general, devices connected to a network such as a LAN or the Internet establish a connection between devices by registering a network logical address (IP address).

  For example, a programming device that communicates with a programmable controller at high speed via a network has been put to practical use. This programming device can register a programmable controller by registering an IP address set in a connected programmable controller. To establish a connection with. Therefore, it is necessary for the user to remember the IP address set in the connected programmable controller for communication.

  However, since this IP address may change even when the system configuration is changed even in the same network device, there is a complication that it is necessary to remember the IP address every time it is changed. In addition, there may be a plurality of programmable controllers that can be connected in the network. Usually, the number of connected stations cannot be accurately grasped without referring to a drawing such as a configuration diagram.

On the other hand, as a conventional technique for managing connectable devices in a network, Patent Document 1 discloses device configuration management data that combines a communication unit's individual identification code and communication parameters such as an IP address. There has been proposed an apparatus for storing and sending to a communication unit that a solid identification code corresponding to a communication parameter set for each type of communication unit matches a solid identification code in an actual communication unit.
JP 2004-302735 A

  However, in the above-described conventional technology, for a device whose IP address is originally known, it is possible to obtain a solid identification code by communicating with the device based on this IP address, but in the first place the IP address is known. If not, it is not possible to communicate with the device and obtain a solid identification code. That is, how to obtain a solid identification code of a device whose IP address is unknown is a problem.

  The present invention has been made in view of the above-described circumstances, and can automatically detect a network logical address (IP address) of a device connected to a network, and simply and reliably whether or not the device is a connection target device. It is an object of the present invention to provide a network connection station information output device, a network connection station information output method, and a program that can be determined and connected.

  In order to achieve the above object, a connection station information output apparatus according to the present invention is a network connection station information output apparatus that outputs connection information of devices connected to a network, and uses its own network logical address. A search address generating means for generating a search address for searching for a device connected to the network, a physical address collecting means for collecting a network physical address of the device in association with the search address, and a physical address collecting means Address determination means for determining whether or not the collected network physical address satisfies a predetermined extraction condition; and when the address determination means determines that the network physical address satisfies the extraction condition, the search address is Network logic corresponding to the network physical address Characterized by comprising an output means for outputting as a dress, a.

  The network connection station information output method according to the present invention is a method for outputting connection information of a device connected to the network, and searches for the device connected to the network using its own network logical address. Generating a search address for performing, collecting a network physical address of the device in association with the search address, and determining whether the collected network physical address satisfies a predetermined extraction condition And a step of outputting the search address as a network logical address corresponding to the network physical address when it is determined that the network physical address satisfies the extraction condition.

  The program according to the present invention is a program that operates on a device that outputs connection information of devices connected to the network, and searches for devices connected to the network using its own network logical address. Search address generation processing for generating a search address for performing a search, physical address collection processing for collecting a network physical address of a device in association with the search address, and whether the collected network physical address satisfies a predetermined extraction condition An address determination process for determining whether or not, and an output process for outputting a search address as a network logical address corresponding to the network physical address when it is determined in this address determination process that the network physical address satisfies the extraction condition; , Special To.

  In the present invention, a search address for searching for a device connected to the network is generated from its own network logical address, a transmission request for the network physical address is made to this search address, and then the network physical address Is received in association with the network physical address and the search address. If the stored network physical address satisfies a predetermined extraction condition, the search address associated with the network physical address is output as a connectable network logical address.

  In the connection station information output device according to the present invention, the network logical address further includes a network address part for identifying a segment (subnet) in the network and a host address part for identifying a device in the segment. The search address generating means extracts a network address portion from its own network logical address, and searches by combining the extracted network address portion and a host address portion that is generated by incrementing sequentially from a predetermined initial value. An address is generated.

  The network address part and the host address part may determine the information length (bit length or byte length) in advance, or calculate the respective information length from the subnet mask set by the local station. Also good.

  The network address portion only needs to be able to substantially identify a segment (subnet) in the network, and the host address portion only needs to be able to substantially identify a device (computer or host) in the segment. For example, in Ipv6, so-called global routing prefix and segment ID correspond to the network address part, and interface ID corresponds to the host address part.

  The physical address collection means makes a network physical address transmission request to each of a plurality of search addresses generated by incrementing the host address portion. When a transmission request is made, it is transmitted by broadcast so that all stations connected to the network can receive the transmission request. Then, only the station whose search IP address matches its own IP address returns its own network physical address in response to this transmission request. The physical address collection means stores the search address and the collected network physical address in association with each other.

  This protocol can be realized, for example, by executing an address resolution protocol (ARP) by starting a network diagnostic program (PING) in TCP / IP.

As the extraction conditions for the address determination means, the following conditions are preferably used alone or in combination.
(1) Of the network physical addresses collected by the physical address collecting means, the OUI part, which is a code part assigned to each manufacturer, matches a predetermined manufacturer code.
(2) For the network physical address, a part of the unique address part managed for each manufacturer is assigned as a group code part for identifying the device group, and the group among the network physical addresses collected by the physical address collecting means The code part must match the code of a given device group.

  In particular, by identifying the type of device with a group identification code that combines a manufacturer code and a group code, it is possible to accurately manage connections even when multiple models of multiple manufacturers (vendors) are connected to the same network. It can be carried out.

  According to the present invention, it is possible to automatically detect a network logical address of a device connected to a network. In addition, the network logical address can be updated even if the system configuration is changed, and it can be easily and reliably determined whether or not the device is a connection target device based on the collected network physical address.

  Embodiments of the present invention will be described below. In the present embodiment, a PLC will be described as a connection target device by taking as an example a programming device of a programmable controller (hereinafter referred to as PLC) as a network connection station information output device.

  FIG. 1 is a system configuration diagram of a network connection station information output device according to the first embodiment and each device connected to the network connection station information output device via a network.

  Here, the network connection station information output device 1 is connected to the PLCs 111 and 112 that are connection stations (connection target devices) and other network devices 113 via the network 110.

  The network connection station information output device 1 includes a central processing unit (hereinafter referred to as CPU) 101, a system memory 102, a program memory 103, an input device 04 including a mouse and a keyboard, a display unit 105 including a display, and a network module. Each of these units 101 to 106 exchanges data via a common bus 107. The network connection station information output device 1 communicates with each station connected to the network 110 via the network module 106, that is, the PLCs 111 and 112 or the network device 113.

  FIG. 2 is a software functional configuration diagram of the network connection station information output device 1. The search address generation means 201 for generating a network logical address (hereinafter referred to as IP address) group belonging to the network address of the network 110 to which the network connection station information output apparatus 1 is connected, and the search address generation means 201 connects to the network 110. A physical address collecting unit 202 that collects network physical addresses (hereinafter referred to as MAC addresses) of the devices that are connected, and a MAC address corresponding to a predetermined PLC is selected from the MAC addresses collected by the physical address collecting unit 202 The address determination unit 203 includes an output unit 204 that outputs an IP address corresponding to the selected MAC address to the display unit 105. Each means 201-204 is realizable by a program as a function of CPU101.

  Note that the substance of the program is stored in the program memory 103 and loaded into the CPU 101 for execution. Further, the PLCs 111 and 112 have a function of responding to connection confirmation by the physical address collection unit 202, for example, a function of sending an ARP response to an ARP (Address Resolution Protocol) request.

3 to 8 are information resources used in the present embodiment.
FIG. 3 is a data configuration diagram of the IP address. As shown in FIG. 3A, the IP address is composed of a network address part for identifying a segment (subnet) in the network and a host address part for identifying a host (connection station) in the segment. . As shown in FIG. 3B, the system memory 102 stores the bit positions and information lengths of the network address portion and the host address portion. These pieces of information are input from the input device 104.

  FIG. 4 is a data configuration diagram of the search IP address table 300 that stores the IP addresses generated by the search address generation unit 201. In the search IP address table 300, the MAC addresses collected by the physical address collection unit 202 are stored in association with the corresponding search IP addresses. The record area composed of the pair of the IP address and the MAC address exists within the range of values that the host address can take.

  FIG. 5 is a data configuration diagram of the display IP address table 301 used by the address determination unit 203 to write an identification flag indicating whether or not an IP address with a registered MAC address belongs to a connectable PLC. A pair of IP address and connectable PLC flag forms one record. It has the same number of record areas as the search IP address.

  FIG. 6 is an explanatory diagram of a MAC address pattern used as a determination criterion when the address determination unit 203 selects connectable PLCs.

  These information resources are stored in the system memory 102, and are referred to or saved in order for the CPU 101 to execute the units 201 to 204.

  FIG. 7 is a diagram showing parameter data for socket communication of the OS that is necessary when issuing a PING (Packet Internet Groper) command. An ARP request is transmitted to the IP address set in the socket connection table.

  FIG. 8 is a diagram showing parameter data necessary for obtaining the ARP table from the OS. Based on the ARP response, the MAC address and IP address of the connected device are stored in association with each other. By executing the ARP protocol, the ARP table is refreshed.

Next, the operation of the network connection station information output apparatus 1 having the above configuration will be described.
FIG. 9 is a flowchart showing the overall flow of processing of the network connection station information output device 1. In this figure, the network connection station output device 1 is a search IP address, which is a table of IP addresses that should be first confirmed by the search address generation means 201 when an activation request from a user or periodic operation is started. A table 300 is generated (S101).

  Next, the physical address collection unit 202 executes an address resolution protocol (ARP) by issuing a PING command to each search IP address according to the search IP address table 300, and the MAC address which is the response Is acquired to confirm the presence of a device connected to the network 110 (S102). Subsequently, the address determination unit 203 is activated, and it is determined whether or not the PLC is connectable by collating the registered MAC address pattern with the MAC address by the ARP response (S103). If it is a connectable PLC, the output means 204 converts the search IP address issued to this PLC into a display character string, and outputs it to the display unit 105 as the IP address of this PLC. (S104).

Hereinafter, each process of said step S101-step S104 is explained in full detail.
(Search address generation process)
FIG. 10 is a flowchart showing the processing procedure of the search address generation means 201. In the present embodiment, as shown in FIG. 3, an IP address is composed of 4-byte data, and an address form in which the upper 3 bytes are used as a network address and the lower 1 byte is used as a host address will be described as an example. Stations having the same network address are defined as the same segment.

  The search address generation unit 201 acquires the IP address of itself (network connection station information output device 1) from the OS, and saves the network address part of the IP address to the system memory 102 (S201). Next, a host address which is a variable for sequentially accessing the search IP address table 300 and the display IP address table 301 is initialized. Specifically, “1”, which is the initial value of the host address part of the search IP address, is set (S202). In this embodiment, the host address is processed in order from 1 to 255. However, the present invention is not limited to this, and an appropriate value can be set according to the range of values that the host address can take. good.

  Next, it is determined whether or not the search IP address table 300 has been processed to the end, that is, whether or not the host address has been executed to 255 (S203). If not, an IP address belonging to the same segment as the network connection station information output device 1 is generated by combining the value of the network address saved in step S201 and the variable value of the host address, and the current IP address table 300 is searched. Is stored in the IP address portion of the record area corresponding to the host address value (S204). In the figure, the search IP address table [host address] means a record area corresponding to the value of the current host address in the search IP address table.

  Then, the host address is incremented to sequentially access the search IP address table 300 (S205), and the process returns to step S203.

(Physical address collection processing)
FIG. 11 is a flowchart showing a processing procedure of the physical address collection unit 202.
First, a host address, which is a variable for sequentially accessing the search IP address table 300, is initialized (S301).

  Next, it is determined whether or not the search IP address table 300 has been processed to the end (S302). If it has been processed to the end, the process ends. If it has not been processed to the end, the search IP address table [host address] PING is sent to the IP address (S303). As a result, ARP is executed, and when the network device responds, the IP address and MAC address of the responding network device are registered in the ARP table of the network connection station information output device 1 that is the transmission source. The physical address collection unit 202 acquires this ARP table from the OS (S304).

  Next, it is searched whether there is a search IP address in the ARP table (S305), and if it exists, the MAC address in the ARP table is stored in the MAC address part of the search IP address table [host address]. (S306).

  Thereafter, the host address is incremented (S307), and the process returns to step S302.

(Address judgment processing)
FIG. 12 is a flowchart showing a processing procedure of the address determination unit 203.
When the address determination unit 203 is started by the end of the processing of the physical address collection unit 202, first, the host address for sequentially accessing the search IP address table 300 and the display IP address table 301 is initialized. (S401).

  Next, it is determined whether or not the display IP address table 301 has been processed to the end (S402). If it has been processed to the end, the process ends. If it has not been processed to the end, the search IP address table [host address] The IP address stored in the IP address portion is transferred to the IP address portion of the display IP address table [host address] (S403). Then, with reference to the MAC address pattern data 302, it is determined whether or not the MAC address in the search IP address table [host address] matches any of the MAC address patterns (S404). The MAC address pattern is a value defining the upper 4 bytes of the MAC address as shown in FIG. The number of bytes may be arbitrarily settable.

  If YES in step S404, it is determined that the PLC is connectable, and the connectable PLC flag in the display IP address table [host address] is turned ON (S405). Thereafter, the host address is incremented (S406), and the process returns to step S402.

(Display output processing)
FIG. 13 is a flowchart showing the processing procedure of the output means 204.
When the output unit 204 is activated by a request from a user or the end of the processing of the address determination unit 203, first, a host address variable for sequentially accessing the display IP address table 301 is initialized (S501).

  Next, it is determined whether or not the display IP address table 301 has been processed to the end (S502). If the display IP address table 301 has been processed to the end, the process ends. If not, the search IP address table [host address] It is determined whether or not the MAC address is registered in the MAC address part (S503). If the MAC address is registered, it is determined that the network device having the IP address stored in the IP address part exists on the network. .

If Yes in step S503, the IP address value in the IP address portion of the display IP address table [host address] is converted into a display character string (S504).
Next, the ON / OFF state of the connectable PLC flag in the display IP address table [host address] is determined (S505). If the flag is ON, the connectable PLC is represented in the display IP address character string. Display data to which “PLC” is added is generated (S506). Then, display data is output to the display unit 105 (S507).
When the display output process ends, the host address is incremented (S508), and the process returns to step S502.

  Through the above processing, the network connection station information output device 1 can acquire the IP address of the device connected to the network, specifies the connection target device, and displays only the IP address information of the connection target device. be able to.

  As described above, according to the present embodiment, the device (connection station) connected to the network can be easily specified via the network, so that the IP address of the connection station is stored. This reduces the burden of address management. Also, there is an effect that it is possible to easily search for a connection station whose IP address has been changed. Furthermore, even if the IP address of the connecting station is set by mistake, the correct IP address can be easily grasped.

  Furthermore, since it is possible to easily search for devices that can be connected to the network connection station information output device without having specialized knowledge of the network, the load on the device user can be reduced.

  In addition, in order to grasp the IP address of the connecting station, it is not necessary to go to the place where the connecting station is installed and it is not necessary to reconnect the communication cable. Can be reduced.

  Further, according to the present embodiment, it is possible to grasp the connection state of all the connected stations, so that it is possible to monitor the dropout or failure of the station by periodically checking the connection. In addition, since all the IP addresses used by network devices in the network can be confirmed, the actual free IP address can be easily grasped, and the burden of IP address assignment work when a new network module is added. Can be reduced.

Next, a second embodiment of the present invention will be described.
The hardware configuration of the network connection station information output apparatus according to this embodiment is the same as that of FIG. 1, and can be realized by a general-purpose computer apparatus such as a personal computer.

  FIG. 14 is a software functional configuration diagram of the network connection station information output device 1 according to the present embodiment. The main difference from FIG. 2 is that the connection station management table 306 shown in FIG. 15 is used instead of the display IP address table 301, and the processing procedure of the address determination means 203a and output means 204a will be described later. It has changed.

  In FIG. 15, the connected station management table 306 registers the MAC address of the station connected to the network, and stores an IP address, a connection target flag, and a connection non-target flag in association with each MAC address.

  Hereinafter, the operation of the network connection station information output apparatus according to the present embodiment will be described focusing on the difference from the first embodiment. Note that the search address generation process and the physical address collection process are the same as those in the first embodiment, and a description thereof will be omitted.

(Address judgment processing)
FIG. 16 is a flowchart illustrating a processing procedure of the address determination unit 203a according to the second embodiment.
When the address determination unit 203a is activated, first, only the IP address column of the connection station management table 306 is cleared (S601), and a host address for sequentially accessing the search IP address table 300 is initialized (S602). ).

  Next, it is determined whether or not the search IP address table 300 has been processed to the end (S603). If it has been processed to the end, the process ends. If not, the search IP address table [host It is determined whether or not the MAC address is stored in [Address] (S604). If the MAC address is stored, the MAC address is extracted (S605). Then, the access point management table 306 is accessed to determine whether or not the MAC address extracted in step S605 is registered in the table 306 (S606). If it exists, the IP of the extracted MAC address is determined. The address is updated (S607), and it is determined whether or not the flag information has been registered (S608). As a result of this determination, if either the connection target flag or the connection non-target flag has been registered (“Yes” in S608), the host address is incremented (S616), and the process returns to step S603 to repeat the process.

  On the other hand, if the MAC address extracted in step S605 is not registered in the connected station management table 306 in step S606 (“No” in S606), the extracted MAC address is registered in the table 306 (S609). The IP address of the MAC address is registered (S610). Next, it is determined whether or not the MAC address extracted in step S605 matches the MAC address pattern (S611). If no flag information is registered in step S608, the process proceeds to step S611.

  If the MAC address pattern does not match in step S611 (“No” in S611), a message for prompting confirmation of whether or not to be connected is output to the display unit 105 (S612) and input via the input device 104. If the received answer is a connection target (“Yes” in S613), the connection target flag of the MAC address is turned ON (S614). In the case of Yes in step S611, the process proceeds to step S614.

On the other hand, if it is not a connection target in step S613, the connection non-target flag of the MAC address is turned ON (S615).
Thereafter, the host address is incremented (S616), and the process returns to step S603.

(Display output processing)
FIG. 17 is a flowchart illustrating a processing procedure of the output unit 204a according to the second embodiment.
When the output unit 204a is activated, it accesses the connected station management table 306 (S701), determines whether or not the MAC address is registered (S702), and ends if it is not registered. If registered, the first MAC address is accessed (S703).

  Then, it is determined whether or not the IP address is registered (S704). If it is registered, it is determined whether or not the connection target flag is set (S705). If it is set, then the MAC address pattern is determined. The device information and model information corresponding to are extracted (S706).

  For example, device information such as manufacturer name and brand name is registered corresponding to the OUI part of the MAC address pattern, and a table in which model information such as group name is registered corresponding to the group code part is provided. Can be realized.

  Also, the IP address is converted into a display character string (S707), and the device information, the model information, and the IP address display character string are output to the display unit 105 (S708).

Then, it is determined whether or not all MAC addresses have been implemented (S709). If it has been implemented, the process ends. If not (“No” in S709), the next MAC address is accessed (S710). Return to step S704.
On the other hand, if “No” in steps S704 and S705, the process proceeds to step S709.

  Through the above processing, the network connection station information output device 1 creates a connection station management table, updates the IP address using the MAC address as an index, and manages a flag indicating whether the connection is made or not.

  As described above, according to the present embodiment, connection station information is managed for each MAC address by the connection station management table, and when the group identification code of the MAC address is other than a specific code system, the connection target is individually Registration of whether or not. Thereby, it is possible to manage when the connection target determination based on the MAC address pattern and the individual connection target determination are mixed.

  Normally, the MAC address is set directly in the network module, and since this network module has been generalized, if the network module fails, it can be replaced with a different general-purpose product from the manufacturer and continue to operate. it can. This makes it possible to share maintenance products.

Of course, a function for additionally registering individual MAC addresses in the MAC address pattern data 302 may be provided so that they can be managed as connection targets. However, the complexity of MAC address registration and the occurrence of data input errors are suppressed. Can do.
In addition, since this connection station management table uses the MAC address as an index, it is easy to display the device information of the newly detected MAC address or the device information of the MAC address from which the IP address has been deleted. It can be carried out.

  The network connection station information output apparatus according to the present invention can be used as a PLC programming apparatus or other apparatus that extracts stations connected to a network under specific conditions.

1 is a system configuration diagram of a network connection station information output device according to a first embodiment of the present invention and devices connected to the network connection station information output device via a network. It is a software function block diagram of the network connection station information output device 1 of FIG. FIG. 3A is a data configuration diagram of IP address configuration data 303 according to an embodiment of the present invention, FIG. 3A is an explanatory diagram of an IP address, and FIG. 3B is an IP address configuration stored in the system memory 102 of FIG. It is a figure which shows an example of data. FIG. 3 is a data configuration diagram of a search IP address table 300 in FIG. 2. FIG. 3 is a data configuration diagram of a display IP address table 301 in FIG. 2. It is a data block diagram of the MAC address pattern data 302 of FIG. It is a data block diagram of the socket connection table 304 of FIG. It is a data block diagram of the ARP table 305 of FIG. It is a flowchart showing the flow of the whole process of the network connection station information output device 1 by this Embodiment. 10 is a flowchart showing a processing procedure of a search address generation means 201 in FIG. 2 and a detailed procedure in step S101 in FIG. 10 is a flowchart showing a processing procedure of the physical address collecting means 202 of FIG. 2 and a detailed procedure of step S102 of FIG. 10 is a flowchart showing a processing procedure of address determination means 203 in FIG. 2 and a detailed procedure in step S103 in FIG. 10 is a flowchart showing a processing procedure of the output means 204 of FIG. 2 and a detailed procedure of step S104 of FIG. It is a software function block diagram of the network connection station information output device 1 by the 2nd Embodiment of this invention. It is a data block diagram of the connecting station management table 306 of FIG. It is a flowchart which shows the process sequence of the address determination means 203a of FIG. It is a flowchart which shows the process sequence of the output means 204a of FIG.

Explanation of symbols

1 Network connection station information output device 101 Central processing unit (CPU)
DESCRIPTION OF SYMBOLS 102 System memory 103 Program memory 104 Input device 105 Display part 106 Network module 107 Common bus 110 Network 111,112 Connection object apparatus (programmable controller)
113 Network equipment 201 Search address generation means 202 Physical address collection means 203, 203a Address determination means 204, 204a Output means 300 Search IP address table 301 Display IP address table 302 MAC address pattern data 303 IP address configuration data 304 Socket connection table 305 ARP table 306 Connection station management table

Claims (7)

A network connection station information output device that outputs connection information of devices connected to a network,
A connection station management table in which a network logical address and flag information indicating whether or not to be connected are associated with each network physical address;
Search address generation means for generating a search address for searching for devices connected to the network using its own network logical address;
Physical address collection means for collecting a network physical address of the device in association with the search address;
Of the network physical address, network logical address, and flag information in the connection station management table, only the network logical address is cleared, and the network physical address collected by the physical address collection means is already registered in the connection station management table. If the network physical address collected by the physical address collecting means is not registered in the connection station management table, the connection station management is registered. Register the network physical address in the table, register the network logical address corresponding to the network physical address,
If the flag information corresponding to the network physical address collected by the physical address collecting means is not registered in the connected station management table, it is determined whether or not the network physical address satisfies a predetermined extraction condition And
As a result of the determination, when the network physical address registered in the connection station management table satisfies a predetermined extraction condition, the flag information associated with the network physical address is set as a connection target, As a result of the determination, if the network physical address registered in the connected station management table does not satisfy a predetermined extraction condition, a message indicating whether or not it is a connection target is displayed and output based on an answer input. Address determining means for setting the flag information associated with a network physical address ;
Output means for outputting a network logical address in which the flag information is set as a connection target ;
A network connection station information output device comprising: The network logical address has a network address part for identifying a segment in the network and a host address part for identifying a device in the segment,
The search address generation means extracts the network address portion from its own network logical address, and combines the extracted network address portion and a host address portion that is generated by incrementing sequentially from a predetermined initial value. The network connection station information output device according to claim 1, wherein the search address is generated.   The physical address collecting means executes an address resolution protocol (ARP) by starting a network diagnostic program (PING) in TCP / IP for each of a plurality of search addresses generated by incrementing the host address portion. The network connection station information output device according to claim 2, wherein the network physical address for each search address is collected.   The address determination means uses the network physical address collected by the physical address collection means as an extraction condition that an OUI part that is a code part assigned for each manufacturer matches a predetermined manufacturer code. The network connection station information output device according to any one of claims 1 to 3.   In the network physical address, a part of a unique address part managed for each manufacturer is assigned as a group code part for identifying a device group, and the address determination means is collected by the physical address collection means. The network connection station information output according to any one of claims 1 to 4, wherein the extraction condition is that the group code portion matches a code of a predetermined device group among the network physical addresses. apparatus. A method for outputting connection information of a device connected to a network,
Generating a search address for searching for a device connected to the network using its own network logical address;
Collecting a network physical address of the device in association with the search address;
For each network physical address, clear only the network logical address out of the network physical address, network logical address, and flag information in the connection station management table that associates the network logical address with flag information indicating whether or not to connect, and If the network physical address collected by the physical address collecting means is already registered in the connection station management table, the network logical address is registered in association with the network physical address, while being collected by the physical address collecting means When the network physical address is not registered in the connection station management table, the network physical address is registered in the connection station management table and the network corresponding to the network physical address is registered. To register the physical address,
If the flag information corresponding to the network physical address collected by the physical address collecting means is not registered in the connected station management table, it is determined whether or not the network physical address satisfies a predetermined extraction condition And
As a result of the determination, when the network physical address registered in the connection station management table satisfies a predetermined extraction condition, the flag information associated with the network physical address is set as a connection target, As a result of the determination, if the network physical address registered in the connected station management table does not satisfy a predetermined extraction condition, a message indicating whether or not it is a connection target is displayed and output based on an answer input. Setting the flag information associated with a network physical address ;
Outputting a network logical address in which the flag information is set as a connection target ;
A network connection station information output method comprising: A program that operates on a device that outputs connection information of devices connected to a network,
A search address generation process for generating a search address for searching for devices connected to the network using its own network logical address;
A physical address collection process for collecting a network physical address of the device in association with the search address;
For each network physical address, clear only the network logical address out of the network physical address, network logical address, and flag information in the connection station management table that associates the network logical address with flag information indicating whether or not to connect, and If the network physical address collected by the physical address collecting means is already registered in the connection station management table, the network logical address is registered in association with the network physical address, while being collected by the physical address collecting means When the network physical address is not registered in the connection station management table, the network physical address is registered in the connection station management table and the network corresponding to the network physical address is registered. To register the physical address,
If the flag information corresponding to the network physical address collected by the physical address collecting means is not registered in the connected station management table, it is determined whether or not the network physical address satisfies a predetermined extraction condition And
As a result of the determination, when the network physical address registered in the connection station management table satisfies a predetermined extraction condition, the flag information associated with the network physical address is set as a connection target, As a result of the determination, if the network physical address registered in the connected station management table does not satisfy a predetermined extraction condition, a message indicating whether or not it is a connection target is displayed and output based on an answer input. An address determination process for setting the flag information associated with a network physical address ;
An output process for outputting a network logical address in which the flag information is set as a connection target ;
A program that causes a computer to execute.

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