JP5088971B2 - Network test apparatus, network test method, and program - Google Patents

Description

  The present invention relates to a network test apparatus that monitors IP packets flowing on a network, identifies the cause of occurrence of a failure, and supports repair work when an IP device connected to the network cannot normally use a network service. .

  Conventionally, when a network connection malfunctions and cannot be used normally in ordinary homes or offices, IP packets flowing over the network are monitored to check whether the protocol is operating normally and operate normally. If not, the cause of the failure is identified and repaired.

  In general, a method of monitoring IP packets flowing in a network is widely used as a method for detecting a network abnormality. For example, a protocol monitor tool is known that acquires IP packets transmitted over a network and displays details of the IP packets, a protocol composed of the IP packets, and an IP address of an IP terminal that transmits and receives the IP packets (WireShark). , http://www.wireshark.org/).

  In addition, as a means for monitoring the operating state of the IP device connected to the network, the connection configuration of the IP device is estimated by visualizing the connection configuration of the IP device based on the monitored IP packet. There is known a method that can be easily determined by a person (for example, see Non-Patent Document 1).

Yoichi Kato and Masaru Miyamoto “Study of Home Network Fault Isolation-Visualization for Efficient Fault Diagnosis (Network Management)” IEICE Technical Report, ICM2008-64, 108 (481), pp35-40 , 2009

  When an IP device such as a PC connected to the network becomes unable to use the network service normally, the IP packet flowing from the IP device is monitored, and various protocols necessary for using the network service operate normally. In order to accurately identify the cause and problem of the occurrence, it is necessary to operate the IP device, sequentially generate the protocols necessary for using the network service, and monitor the protocol with a protocol monitor or the like. is there.

  However, the operation procedure for generating a protocol differs depending on various factors such as the type of protocol, the type of IP device, and the version of the OS installed when the IP device is a PC. Therefore, it takes time to learn the operation procedure, which is a heavy burden on the user who repairs. In addition, depending on the type of protocol, a procedure having a large number of steps must be sequentially executed, and the work time becomes long.

  On the other hand, when analyzing the acquired protocol and diagnosing whether or not the protocol has arrived normally, if it has reached normal operation, or whether it has reached but an error has occurred, a specific protocol It is necessary to execute the operation of the IP device for generating the error and the operation of the protocol monitor tool for monitoring in parallel. However, in an environment such as a general home or office, the network wiring configuration and the location of the network terminal Vary greatly depending on the environment. When the installation position of the IP device for generating a specific protocol and the installation position of the protocol monitor tool for monitoring are separated, the installation room for the IP device for generating a specific protocol and for monitoring Therefore, there is a problem that a lot of labor is required to move to and from the room where the protocol monitor tool is installed.

  The present invention analyzes the acquired protocol and specifies whether or not the protocol has arrived normally, if it has arrived, whether it is operating normally, or whether it has arrived but an error has occurred. When the operation of the IP device for generating the protocol and the operation of the protocol monitor tool for monitoring are executed in parallel, it is not necessary for the worker to move between different rooms, and the burden on the worker for the diagnostic work An object of the present invention is to provide a network test apparatus, a network test method, and a program that can reduce the operation time for diagnosis.

The network test apparatus of the present invention is a network test apparatus including a protocol generator and a protocol analyzer, and the protocol generator is connected to an IP device and can use a predetermined network service. Protocol list management means for holding a protocol for diagnosing the protocol, and a protocol type selection for displaying the protocol list held by the protocol list management means on the display and allowing the user to select the type of protocol used for diagnosis And protocol generation means for generating a selected protocol and transmitting it to the network. The protocol analyzer is connected to the network, monitors IP packets, and the IP device can use the network normally. Protocol diagnosis means for determining whether or not The protocol generator includes a network setting information acquisition unit that acquires network setting information of the connected IP device, and a network setting information transmission unit that broadcasts the network setting information of the IP device acquired by the network information acquisition unit to the network. And the protocol analyzer includes network setting information receiving means for receiving, by a packet monitor, network setting information of the IP device broadcast from the network setting information transmitting means. When it is determined that the IP device can normally use the network based on the analysis result and the network setting information of the IP device received by the network setting information receiving unit. IP device settings If the problem is located, or a means of diagnosing whether there is a problem elsewhere.

  According to the present invention, the acquired protocol is analyzed to determine whether or not the protocol has arrived normally, whether or not the protocol has been normally operated, whether it has been operating normally, and whether or not an error has occurred. When an IP device operation for generating a specific protocol and a protocol monitor tool operation for monitoring are executed in parallel, it is not necessary for the operator to move between different rooms, and the operator for the diagnostic work There is a remarkable effect that the burden on the user can be reduced and the operation time for diagnosis can be shortened.

1 is a diagram illustrating a network test apparatus NT1 that is Embodiment 1 of the present invention. FIG. It is a figure which shows the detail of the protocol generator 20 in the network test apparatus NT1. It is a figure which shows the structure in case the protocol generator 20 operate | moves on the IP apparatus 50 with the form of software. It is a figure which shows the detail of the protocol analyzer 30 in the network test apparatus NT1. 4 is a flowchart illustrating an operation of a protocol generator 20 and an operation of a protocol analyzer 30 in the first embodiment. It is a figure which shows the network test apparatus NT2 which is Example 2 of this invention. It is a figure which shows the example of the protocol generator 20a in the network test apparatus NT2. It is a figure which shows the specific example of the protocol analyzer 30a in the network test apparatus NT2. It is a block diagram which shows network test apparatus NT3 which is Example 3 of this invention. It is a block diagram which shows the detailed example of the protocol generator 20b in the network test apparatus NT3. It is a block diagram which shows the detail of the protocol analyzer 30b in the network test apparatus NT3.

  The modes for carrying out the invention are the following examples.

  FIG. 1 is a diagram showing a network test apparatus NT1 that is Embodiment 1 of the present invention.

  The network test apparatus NT1 includes a protocol generator 20 and a protocol analyzer 30 and is connected to the IP device 50.

  The protocol generator 20 is connected to the network 40 and sends a packet 60 to the network 40 by a user operation.

  The protocol analyzer 30 is connected to the network 40 and monitors all packets passing through the network 40.

  The packet 60 generated by the protocol generator 20 is monitored by the protocol analyzer 30 like other packets, and the protocol analyzer 30 determines whether the protocol has arrived or whether the protocol has arrived and is operating normally. Or the protocol has arrived but an error has occurred.

  FIG. 2 is a diagram showing details of the protocol generator 20 in the network test apparatus NT1.

  The protocol generator 20 includes a protocol list management unit 21, a protocol list display unit 22, a protocol type selection unit 23, and a protocol generation unit 24.

  The protocol list management means 21 holds a list of protocols that can be generated by the protocol generator 20. Examples of the protocol are ARP, ICMP, PING, HTTP, DNS, DHCP, SIP, PPPoE, and the like.

  The protocol list display means 22 displays a list of protocols managed by the protocol list management means 21 on the display DP1. The protocol type selection means 23 allows the user to select one or more protocols from the protocol list managed by the protocol list management means 21 using the input device ID1. The protocol generation unit 24 generates the protocol entity selected by the protocol type selection unit 23 and transmits it to the network 40 via the IP device 50.

  The protocol generator 20 may generate a protocol by software operating on the IP device 50.

  FIG. 3 is a diagram showing a configuration when the protocol generator 20 operates on the IP device 50 in the form of software.

  The protocol generator 20 operates as software that operates on the IP device 50. A user attaches an external medium in which software is stored to a network terminal for execution. The external medium is, for example, a CD-ROM or a USB memory. As the display DP1 and the input device ID1, those connected to the IP device 50 are used.

  The protocol list management means 21 holds a list of protocols that can be generated by the protocol generator 20. Protocols include ARP, ICMP, PING, HTTP, DNS, DHCP, SIP, and the like. The protocol list display means 22 displays a list of protocols managed by the protocol list management means 21 on the display DP1. The protocol type selection unit 23 allows the user to select one or more protocols from the protocol list managed by the protocol list management unit 21 via the input device ID1. The protocol entity selected by the protocol type selection unit 23 is generated by the protocol generation unit 24 and transmitted to the network 40.

  FIG. 4 is a diagram showing details of the protocol analyzer 30 in the network test apparatus NT1.

  The protocol analyzer 30 includes a packet monitor unit 31, a protocol extraction unit 32, a protocol diagnosis unit 33, a protocol display unit 34, a packet storage unit 35, a protocol selection unit 36, and a diagnostic rule storage unit 37. .

  The diagnostic rule storage means 37 stores the types of protocols that can be tested in the network test apparatus NT1. For example, when a test related to Web access is performed, name resolution related to the host name of the Web server and access to the Web server are required. Specifically, a DNS request is transmitted from the IP device 50 to the DNS server for the domain name of the Web server, a DNS response is obtained from the DNS server, and then an HTTP request is transmitted from the IP device 50 to the Web server. An HTTP response of 200 OK needs to be obtained from the Web server.

  The diagnostic rule storage means 37 stores the type of test (Web access) and the necessary protocol transmission order (DNS request, DNS response, HTTP request, HTTP response).

  The protocol selection unit 36 displays a list of protocols stored in the diagnostic rule storage unit 37 on the display DP1. When the user selects a protocol to be diagnosed via the input device ID1, the protocol generator 20 displays the type of protocol that the user is trying to generate on the display DP1.

  The packet monitor unit 31 monitors packets in the network. The protocol extraction unit 32 analyzes the packet monitored by the packet monitoring unit 31 and identifies which protocol the packet is. Discard packets that are not subject to analysis or for which the protocol type cannot be specified. For the protocol to be diagnosed, the packets constituting the protocol are stored in the packet storage unit 35 and sent to the protocol diagnosis unit 33.

  The protocol diagnosis unit 33 determines whether the protocol is operating normally, whether the protocol indicates an error state, or whether the monitored protocol is incorrect according to the diagnosis rule stored in the diagnosis rule storage unit 37. A diagnosis is made from the latest protocol sent from the extraction means 32 and the past packets saved in the packet saving means 35. That is, when diagnosing whether or not a plurality of packets are in order, it is necessary to determine up to which point in time in the past, the latest protocol and the past packet are diagnosed.

  Specifically, when testing for the Web access, if a protocol is detected in the order of a DNS request, a DNS response, an HTTP request, and an HTTP response, it is determined that the protocol is operating normally.

  On the other hand, if a DNS response cannot be detected even after a lapse of a certain time (for example, 30 seconds) after detecting a DNS request, a diagnosis result indicating that access to the DNS server has failed is sent to the protocol display means 34.

  Alternatively, if a DNS request is not detected even after a lapse of a certain time (for example, 1 minute) from the start of the test, it is diagnosed that the IP device 50 is not normally connected to the network, and the diagnosis result is displayed as protocol display means. 34.

  Since the protocol diagnosis means 33 needs to diagnose that a plurality of protocols are sequentially detected in the diagnosis, in order to store which protocol has been detected so far, the protocol used so far for the diagnosis is Store in the packet storage means 35.

  The protocol display means 34 displays the diagnosis result from the protocol diagnosis means 33 on the display DP1 in a format that can be seen and understood by a person. As an example, when testing for the above-mentioned Web access, if a DNS request is not detected, “The IP packet from the IP terminal cannot be detected. Check that the IP terminal is correctly connected to the network and assigned the correct IP address. Please output ". If a DNS response is not detected, “You cannot get a response from the DNS server. Check your ISP settings (ID, password) and check that your Internet connection is working properly.” Is output.

  The protocol list management unit 21 is an example of a protocol list management unit that holds a protocol for connecting to an IP device and diagnosing whether or not a predetermined network service can be used. The protocol type selection means 23 is an example of a protocol type selection means for causing the protocol list held by the protocol list management means to be displayed on the display and for the user to select the protocol type used for diagnosis. Further, the protocol generation unit 24 is an example of a protocol generation unit that generates a selected protocol and transmits it to the network. Furthermore, the protocol diagnosis unit 33 is an example of a protocol diagnosis unit that connects to a network, monitors IP packets, and determines whether an IP device can normally use the network.

  FIG. 5 is a flowchart illustrating the operation of the protocol generator 20 and the operation of the protocol analyzer 30 in the first embodiment.

  First, when the user performs an operation for selecting a protocol to be diagnosed on the protocol analyzer 30 (S1), the protocol analyzer 30 displays the protocol type to be selected by the user in the protocol generator 20 on the display DP1. (S2).

  When the user selects the type of protocol to be generated in the protocol generator 20 (S11), the protocol generator 20 generates a protocol of the selected type (S12).

  The generated protocol propagates through the network 40 as a packet and is monitored by the protocol analyzer 30 (S21). If the monitored packet is a protocol error or if an appropriate protocol cannot be detected even after a certain time has elapsed, it is determined that the packet is in an error state (S22), and an error is displayed on the screen (S23).

  If an error state has not occurred, it is determined whether or not the protocol is halfway (S24). If it is halfway, the previous packet is stored (S25) and the packet is continuously monitored (S21).

  If the protocol is completed without error, the protocol is displayed as normal (S26), and the diagnosis is completed.

  That is, in the first embodiment, the generated protocol propagates through the network 40 and reaches the protocol analyzer 30. Then, the protocol analyzer 30 analyzes the acquired protocol, whether or not the protocol has reached normally, whether or not the protocol has been normally operated, whether it has arrived but an error has occurred, etc. Diagnose. If an error has occurred, the location and cause of the occurrence are estimated.

  According to the first embodiment, when an IP device operation for generating a specific protocol and a protocol monitor tool operation for monitoring are executed in parallel, an operator moves many times between different rooms. This is unnecessary, reducing the burden on the operator for the diagnosis work and reducing the operation time for the diagnosis.

  FIG. 6 is a diagram showing a network test apparatus NT2 that is Embodiment 2 of the present invention.

  The network test apparatus NT2 includes a protocol generator 20a and a protocol analyzer 30a.

  The protocol specified by the user is transmitted to the network 40 in the packet 60 format.

  The protocol generator 20a is connected to the IP device 50a connected to the network 40, first acquires the network setting information 70 of the IP device 50a, and transmits it to the network 40 in the form of a packet.

  The protocol generator 20a includes a protocol list management unit 21, a protocol list display unit 22, a protocol type selection unit 23, a protocol generation unit 24, a network setting information acquisition unit 25, and a network setting information transmission unit 26. .

  The packet 60 generated by the protocol generator 20a is also monitored by the protocol analyzer 30a, and the protocol is operating normally, the protocol has not reached, or the protocol has arrived but an error has occurred. The protocol analyzer 30a diagnoses whether it is in progress.

  FIG. 7 is a diagram illustrating an example of the protocol generator 20a in the network test apparatus NT2.

  The protocol generator 20 a operates as software that operates on the IP device 50 a and operates on a terminal of the network 40. The user attaches the external medium storing the software to the terminal of the network 40 and executes it. The external medium is, for example, a CD-ROM, a USB memory or the like. The display DP1 and the input device ID1 that are connected to the IP device 50a are used.

  The protocol list management means 21 holds a list of protocols that can be generated by the protocol generator 20a. The protocol is ARP, ICMP, PING, HTTP, DNS, DHCP, SIP, or the like. The protocol list display means 22 displays a list of protocols managed by the protocol list management means 21 on the display DP1. The protocol type selection means 23 allows the user to select one or more protocols from the protocol list managed by the protocol list management means 21 using the input device ID1. The protocol entity selected via the protocol type selection means 23 is generated by the protocol generation means 24 and transmitted to the network 40.

  The network setting information acquisition unit 25 reads the network setting information from the IP device 50a. The network setting information is information necessary for the IP device 50a to connect to the network 40. For example, whether or not DHCP is used, IP address, subnet mask, default gateway, DNS server, Web browser proxy server address, port, etc. It is.

  The network setting information transmitting unit 26 transmits the network setting information acquired by the network setting information acquiring unit 25 to the network 40 in the form of a packet. At this time, the destination IP address needs to be an address to which the packet is reliably transmitted. For example, a broadcast address (255.255.255.255) may be used.

  The network setting information transmitting unit 26 transmits the network setting information before the user selects and transmits a protocol by operating the input device ID1.

  FIG. 8 is a diagram showing a specific example of the protocol analyzer 30a in the network test apparatus NT2.

  The protocol analyzer 30 a is connected to the network 40 and monitors all packets passing through the network 40. The network setting information 70 is monitored by the protocol analyzer 30a in the same manner as other packets, and acquires the network setting information 70 of the IP device 50a.

  The protocol analyzer 30a includes a packet monitor unit 31, a protocol extraction unit 32, a protocol diagnosis unit 33, a protocol display unit 34, a packet storage unit 35, a protocol selection unit 36, a diagnostic rule storage unit 37, a network And setting information receiving means 38.

  The diagnostic rule storage means 37 stores the types of protocols that can be tested in the network test apparatus NT2.

  The protocol selection unit 36 displays a list of protocols stored in the diagnosis rule storage unit 37 on the display DP1, and when the user selects a protocol to be diagnosed using the input device ID1, the user selects The type of protocol to be generated by the protocol generator 20a is displayed on the display DP1.

  The packet monitor unit 31 monitors packets in the network 40. Here, when a packet containing the network setting information transmitted from the protocol generator 20 a is detected in the network 40, the corresponding packet is sent to the network setting information receiving means 38. The network setting information receiving unit 38 analyzes the packet output from the packet monitoring unit 31 and extracts network setting information. This extracted network setting information is sent to the protocol diagnosis means 33.

  The protocol extraction unit 32 analyzes the packet monitored by the packet monitoring unit 31 and identifies which protocol the packet is. Discards packets that are not subject to analysis or that cannot specify the protocol type. For the protocol to be diagnosed, a packet constituting the protocol is stored in the packet storage unit 35 and sent to the protocol diagnosis unit 33.

  The protocol diagnosis unit 33 determines whether the protocol is operating normally, whether the protocol indicates an error state, or whether the monitored protocol is incorrect according to the diagnosis rule stored in the diagnosis rule storage unit 37. A diagnosis is made from the latest protocol sent from the extraction means 32 and the past packets saved in the packet saving means 35. Here, if the protocol indicates an error state, the network setting information output from the network setting information receiving unit 38 is checked to diagnose whether the network setting of the terminal of the network 40 is correct.

  The protocol display means 34 displays the diagnosis result of the protocol diagnosis means 33 on the display DP1 in a format that can be seen and understood by a person.

  The network setting information acquisition unit 25 is an example of a network setting information acquisition unit that acquires network setting information of a connected IP device. The network setting information transmitting unit 26 is an example of a network setting information transmitting unit that transmits the network setting information of the IP device acquired by the network information acquiring unit to the protocol analyzer. The network setting information receiving unit 38 is an example of a network setting information receiving unit that receives the network setting information of the IP device from the network setting information transmitting unit. Further, the protocol diagnosis unit 33 determines whether the IP device can normally use the network based on the protocol analysis result and the network setting information of the IP device received by the network setting information receiving unit. If it is determined as NO, it is means for diagnosing whether there is a problem in the setting of the IP device or a problem in another part.

  When diagnosing whether the proxy information of the web is incorrect, conventionally, it is necessary to operate the IP device. However, in the second embodiment, the network setting is information necessary for the IP device 50a to connect to the network 40. Since the network setting information acquisition unit 25 reads the information from the IP device 50a, an operation of acquiring information from the IP device can be omitted.

  FIG. 9 is a block diagram showing a network test apparatus NT3 that is Embodiment 3 of the present invention.

  The network test apparatus NT3 includes a protocol generator 20b and a protocol analyzer 30b.

  FIG. 10 is a block diagram showing a detailed example of the protocol generator 20b in the network test apparatus NT3.

  The protocol generator 20b operates as software that operates on the IP device 50b. The user attaches the external medium storing the software to the terminal of the network 40 and executes it. The external medium is, for example, a CD-ROM or a USB memory.

  The protocol generator 20b includes a protocol list management unit 21, a protocol generation unit 24, and a protocol generation signal reception unit 27.

  The protocol list management means 21 holds a list of protocols that can be generated by the protocol generator 20b. When receiving the protocol transmission command signal 80 sent from the protocol analyzer 30b via the network 40, the protocol generation signal receiving unit 27 instructs the protocol generation unit 24 to generate and transmit the protocol.

  The protocol generation unit 24 generates an entity of the protocol and transmits it to the network 40.

  FIG. 11 is a block diagram showing details of the protocol analyzer 30b in the network test apparatus NT3.

  The protocol analyzer 30b includes a packet monitor unit 31, a protocol extraction unit 32, a protocol diagnosis unit 33, a protocol display unit 34, a packet storage unit 35, a protocol selection unit 36, a diagnostic rule storage unit 37, and a protocol. Transmission command signal transmission means 39.

  The diagnostic rule storage means 37 stores the types of protocols that can be tested in the network test apparatus NT3. The protocol selection unit 36 displays a list of protocols stored in the diagnostic rule storage unit 37 on the display DP1. When the user selects a protocol to be diagnosed via the input device ID1, the type of protocol that the user should generate in the protocol generator 20b is displayed on the display DP1. The protocol type selected by the user is transmitted from the protocol transmission command signal transmission means 39 to the protocol generator 20b in the form of a packet. Further, it is sent from the protocol selection means 36 to the protocol extraction means 32 and used for extracting the protocol.

  The packet monitor unit 31 monitors packets in the network 40. The protocol extraction unit 32 analyzes the packet monitored by the packet monitoring unit 31 and identifies which protocol the packet is. At this time, the protocol type obtained in advance from the protocol selection means 36, which refers to the protocol type selected by the user, discards the packet that is not the object of analysis and the packet whose protocol type could not be specified. For the protocol to be diagnosed, the packets constituting the protocol are stored in the packet storage unit 35 and sent to the protocol diagnosis unit 33.

  The protocol diagnosis unit 33 determines whether the protocol is operating normally, whether the protocol indicates an error state, or whether the monitored protocol is incorrect according to the diagnosis rule stored in the diagnosis rule storage unit 37. A diagnosis is made from the latest protocol output by the extraction means 32 and the past packets stored in the packet storage means 35.

  The protocol display means 34 displays the diagnosis result of the protocol diagnosis means 33 on the display DP1 in a format that can be seen and understood by a person.

  The protocol transmission command signal transmission means 39 transmits a protocol transmission command signal 80 describing the type of packet to be transmitted to the protocol generator 20b.

  When the user operates the protocol analyzer 30b to transmit a protocol transmission command signal 80 describing the type of packet to be transmitted, the protocol generator 20b receives the protocol transmission command signal 80. The protocol generator 20b transmits the protocol 60 described in the protocol transmission command signal 80 to the network 40 in the form of a packet.

  The protocol analyzer 30b is connected to the network 40, monitors all packets passing through the network 40, and the protocol analyzer 30b monitors the packet 60 generated by the protocol generator 20b in the same manner as other packets. Is operating normally, or the protocol is not reached, or the protocol is reached but an error has occurred.

  The protocol transmission command signal transmitting means 39 is a protocol transmission command for transmitting a protocol transmission command signal for instructing transmission of a protocol in which the type of packet to be transmitted is described via the network to the protocol generator. It is an example of a signal transmission means. The protocol generation signal receiving unit 27 receives the protocol transmission command signal transmitted from the protocol generation signal transmission unit from the network, and causes the protocol generation unit to generate a protocol corresponding to the protocol transmission command signal. It is an example of a means.

  According to the third embodiment, since the IP device 50b is completely remotely controlled, when the IP device operation for generating a specific protocol and the protocol monitor tool for monitoring are performed in parallel, the IP device The operator does not need to move between different rooms.

  Moreover, the said Example can be grasped | ascertained as invention of a method. That is, the above embodiment is a method in which a protocol generator and a protocol analyzer test a network, and the protocol generator is connected to an IP device and diagnoses whether a predetermined network service is available. The protocol list management means holds the protocol list management means for the protocol list management means, and the protocol list held in the protocol list management process is displayed on the display, and the protocol type selection means determines the type of protocol used for diagnosis by the user. And a protocol generation step in which the protocol generation unit generates the selected protocol and transmits the selected protocol to the network. The protocol analyzer connects to the network and transmits the IP packet. Monitor and use IP network normally by IP device It is an example of a network testing method of performing protocol diagnosis step of determining whether the capacity.

  Moreover, the said Example can be grasped | ascertained as invention of a program. That is, the said Example is an example of the program which makes a computer perform the said network test method.

NT1, NT2, NT3 ... Network test equipment,
20, 20a, 20b ... protocol generator,
30, 30a, 30b ... protocol analyzer,
40 ... Network,
50 ... IP equipment,
60 ... packets,
70: Network setting information,
80: Protocol transmission command signal.

Claims (3)

A network test apparatus comprising a protocol generator and a protocol analyzer,
The protocol generator is
Protocol list management means for holding a protocol for connecting to an IP device and diagnosing whether or not a predetermined network service is available;
A protocol type selection unit for causing the protocol list held by the protocol list management unit to be displayed on a display and for a user to select a protocol type to be used for diagnosis;
Protocol generation means for generating a selected protocol and sending it to the network;
Have
The protocol analyzer is connected to a network, it monitors IP packets, have a protocol diagnosis means IP device determines whether it can use the network normally,
The protocol generator is
Network setting information acquisition means for acquiring network setting information of the connected IP device;
Network setting information transmitting means for transmitting the network setting information of the IP device acquired by the network information acquiring means to the network by broadcast;
Have
The protocol analyzer includes network setting information receiving means for receiving, by a packet monitor, network setting information of the IP device broadcast from the network setting information transmitting means. The protocol diagnosis means includes a protocol analysis result, a network Based on the network setting information of the IP device received by the setting information receiving means, it is determined whether or not the IP device can use the network normally. A network test apparatus characterized in that it is a means for diagnosing whether there is a problem in the network or in other parts . A protocol generator and a protocol analyzer for testing a network,
The protocol generator is
A protocol list management step in which a protocol list management means holds a protocol for connecting to an IP device and diagnosing whether or not a predetermined network service is available;
A protocol type selection step in which the protocol list held in the protocol list management step is displayed on the display, and the protocol type selection means allows the user to select the type of protocol used for diagnosis;
A protocol generation step in which the protocol generation means generates and transmits the selected protocol to the network;
Run
The protocol analyzer is connected to a network, monitors IP packets, and executes a protocol diagnosis process for determining whether an IP device can normally use the network,
The protocol generator is
A network setting information acquisition step of acquiring network setting information of the connected IP device;
A network setting information transmission step of transmitting the network setting information of the IP device acquired in the network information acquisition step to the network by broadcast;
Run
The protocol analyzer executes a network setting information receiving step of receiving, by a packet monitor, the network setting information of the IP device broadcast in the network setting information transmitting step. The protocol diagnosis step includes a protocol analysis result, a network Based on the network setting information of the IP device received in the setting information receiving step, it is determined whether or not the IP device can use the network normally. A network test method, characterized in that it is a step of diagnosing whether there is a problem in the network or a problem in another part . A program for causing a computer to execute the network test method according to claim 2.

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