JP2008047987A - Fixed ip address acquisition method and ip segment extension method in dhcp environment, and their device and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain efficient utilization of IP address by integrating fixed IP address range with automatic IP assignment range of DHCP operation, reduction in IP address management man-hour of an IP address manager, and automatic acquisition of a fixed IP which is desired by a user. <P>SOLUTION: When a user wishes to use a fixed IP in terminals 14 and 15; the user selects a desirable network address, an object terminal MAC address, and a desirable setting method of a fixed IP for a host apparatus 11 through a Web. The host apparatus 11 acquires operational information of IP address from an IP-ARP table 112 held in a layer 3 switch 12, assigns a non-operating smallest IP as the fixed IP from the DHCP range of a network address desired by the user, and removes the fixed IP from the DHCP lease range of a DHCP server 13. Automatic extension of IP segment can be carried out at a network segment automatic extension 102. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an automatic fixed IP address acquisition method and a network IP segment automatic extension method in a network system of a DHCP (Dynamic Host Configuration Protocol) environment that requires an IP address, and an apparatus and a program thereof.

  Conventionally, in a terminal connected to a LAN (Local Area Network), if the user obtains the terminal and wants to use network services such as mail, Web, file sharing, etc., an application is made to the IP address manager. By performing the above, the administrator performs the allocation every time from the fixed IP allocation range of the network address desired by the user, and notifies the user of the allocated IP. The user sets the IP assigned by the IP address manager to the terminal and uses the network.

DHCP is defined by RFC2131 (a document group compiled by the Internet research and development organization IETF), and in order to automate the setting of client devices in a large-scale network, setting information such as IP addresses is centrally managed, and individual devices are managed. It is a protocol that provides configuration information. In an environment using DHCP, if the terminal device is set to automatically acquire IP, the network can be used without the intervention of a network administrator.
However, even in a DHCP environment, a terminal device such as a print server that is inconvenient if the IP address is frequently changed. When a fixed IP address is desired, an application to the IP address manager and an administrator assignment process are performed. Is required.

  For example, in “Method and method for setting a fixed IP address in a DHCP environment” described in Japanese Patent Application Laid-Open No. 2003-333055 (see Patent Document 1), a means for obtaining a DHCP setting range and a method outside the DHCP setting range are described. By using means for acquiring information on the IP address being used, means for displaying an IP address that can be set or cannot be set, and means for registering the IP address set by the user in a list of IP addresses, A method is shown in which a user can designate a free IP within a fixed IP range without the intervention of an IP address manager.

JP 2003-333055 A

As a first problem in the prior art, in the operation in the DHCP environment, each DHCP segment is divided into a fixed IP address allocation range and a dynamic address range for a DHCP terminal, and a fixed IP address is desired. When the IP address manager allocates a free IP to the terminal from the fixed IP address allocation range, there are many users who have secured the fixed IP address allocation range over a wide range, and the fixed IP allocation number is small. In terms of the address usage rate of the entire segment, it was inefficient.
In other words, DHCP (Dynamic Host Configuration Protocol) allows users who are not familiar with network settings to easily connect to the Internet, and network administrators can easily unify many clients. The number of cases using dynamic IP addresses using DHCP servers is increasing. However, since there are at least devices such as printers, scanners, and PCs having a server function that do not need to change the IP address value, it is necessary to have two ranges of fixed IP and dynamic IP.
Further, since an IP address manager is involved, time loss, troublesome management of the fixed IP address management ledger, and the like have occurred.

  As a second problem of the prior art, in the operation in the DHCP environment, the upper limit connection allowable number of DHCP terminals in the dynamic address range is fixedly determined, and the upper limit terminal number is connected. In the segment, even when a new terminal is connected to the network, an address is not given by the DHCP server, and the network administrator is required to take action.

(the purpose)
The object of the present invention is to solve such problems and to efficiently use IP addresses by integrating ranges that have been divided into fixed IP address ranges and automatic IP allocation ranges for DHCP operation. Fixed IP acquisition method in a DHCP environment in which IP address management man-hours can be reduced and automatic acquisition of a fixed IP desired by a user is possible, and when the range for automatic IP allocation is insufficient, the segment can be automatically expanded. And an IP segment expansion method, and an apparatus and program thereof.

In the fixed IP acquisition method in the DHCP environment of the present invention, a fixed IP address range and an automatic IP allocation range are integrated in a network system having a host device, a plurality of terminal devices, a DHCP server device, and a network relay device. However, all the ranges other than the management range are defined as the automatic IP allocation range.
When a user wants a fixed IP to a terminal he owns or obtains, the user selects a desired network address, a target terminal MAC address, and a fixed IP desire setting method from the Web to the host device, and the host device uses the network relay device IP address operation information is acquired from the IP-ARP table held by the user, and the minimum IP that is not in operation is assigned as a fixed IP from the DHCP range of the network address desired by the user. When excluding from the DHCP lease range and setting as a fixed IP for automatic acquisition setting at the terminal, a combination of the MAC address inputted by the user and the allocation fixed IP is set in the DHCP server, and the allocation IP is always set. Assigns to the terminal.
This makes it possible to efficiently use IP addresses by integrating ranges that have been divided into fixed IP address ranges and automatic IP allocation ranges in DHCP operation, reduce the IP address management man-hours of IP address managers, and user desires The fixed IP to be acquired can be automatically acquired.

Further, in the IP address operation data acquired from the IP-ARP table held by the network relay device, if there is no free IP in the DHCP range of the network address desired by the user, it is held in the host device. An empty network segment is automatically extracted from the network segment table being used, and the segment is automatically expanded by using a function called multi-netting for the desired network address of the network relay device. Multi-netting is one of the functions of network relay devices such as layer 3 switches and routers, and allows two or more logical segments to be defined for one physical segment. Then, by operating this function, it becomes possible to provide a wide range of network operations. This makes it possible to automatically extend the segment when the DHCP automatic IP allocation range is insufficient. In addition, by regularly acquiring IP address operation data, it becomes possible to discover an address shortage earlier and perform automatic segment extension.
In the present invention, the self-expansion of a segment refers to searching for an unused segment, and virtually setting this unused segment and unused segment as one segment (to create a VLAN). It is to expand by.

  According to the present invention, the fixed IP address range in DHCP operation, the integration of the range divided into the automatic IP allocation range, the reduction of the IP address management manpower of the IP address manager, and the automatic fixed IP desired by the user Each acquisition is possible. In addition, when the DHCP dynamic IP allocation range is insufficient, the segment can be automatically expanded.

Embodiments of the present invention will be described below in detail with reference to the drawings.
In the embodiment of the present invention, a case where a layer 3 switch is used as a network relay device constituting a network will be described as an example.
FIG. 1 is a block diagram of an automatic fixed IP acquisition and network automatic expansion apparatus in a DHCP environment according to an embodiment of the present invention.
In the fixed IP acquisition method in the DHCP environment according to the present embodiment, the IP address operation investigation unit 101 that investigates the operation results of the IP addresses connected to the network 10 and the network segment that automatically expands the segment in which the surplus IP of the IP address disappears Automatic extension unit 102, fixed IP address determination and reflection unit 103 that automatically assigns a fixed IP address when a user desires a fixed IP address, network segment table 111 that stores all network segment information, IP address operation Communication between the network device and the host apparatus 11 including the IP-ARP table 112 for storing the result data and the command table 113 for storing various commands to be executed to the layer 3 switch 12 and the DHCP server 13 Layer 3 switch 12 summarize, and the like plurality of terminal devices 14, 15 for a DHCP server 13, and network services to enable IP automatic acquisition of the terminal device.

In the host device 11, the IP address operation investigation unit 101 accesses each layer 3 switch 12 that manages the used network to which the management IP address obtained from the network segment table 111 is assigned, and connects to the network in the system. The MAC address and the IP address information of each device to be collected are collected, the collected result is stored in the IP-ARP table 112, and the information is updated.
Note that the layer 3 switch 12 manages terminal information (IP address, etc.) under its control in a table, and at the time of data transmission / reception, to which terminal the data is addressed is based on the IP address added to the data. It has a function of judging and distributing data to a target destination terminal. Executing these functions is expressed as “management”.

  Next, the network segment automatic extension unit 102 refers to the data in the IP-ARP table 112, and compares the obtained IP address operating number of each segment with the IP allowable number of the network address acquired from the network segment table 111. Then, it is investigated whether or not there is a free IP address. If there is no surplus IP, a network address that is not used is further acquired, the network segment definition of the layer 3 switch 12 is changed to a multi-net, and the network is automatically expanded.

  When a user requests a fixed IP address from a terminal device in a DHCP environment, the fixed IP address determination / reflection unit 103 sends a Web from a terminal device already connected to the network 10 to the host device 11 functioning as a Web server. By accessing, the host device 11 displays a fixed IP address information input screen 301 (see FIG. 8) on the terminal device. The user inputs each item. If a free IP address is found by referring to the IP-ARP table 112 based on the item and a free IP address is found, the IP address is automatically assigned as a fixed IP, and a fixed IP address determination selection screen 302 (see FIG. 9) to inform the user. A method in which the user changes the setting of the assigned fixed IP address selected and input on the IP address information input screen 301 as a fixed IP in the terminal device, or the terminal device is set for automatic IP acquisition, and the DHCP server 13 is set. The method of fixedly assigning the terminal device to the assigned fixed IP address is implemented.

  When setting as a fixed IP address on the terminal side, in the setting of the DHCP server 13, the assigned IP is removed from the automatic acquisition range, and the setting is changed so that it is not allocated to other terminal devices by automatic acquisition. In the case of fixed allocation on the DHCP server 13 side, in the setting of the DHCP server 13, a combination of the allocated IP address and the MAC address of the application terminal is set, and the allocated IP address is always assigned to the application terminal device. To be assigned. Even in this case, in the setting of the DHCP server 13, the assigned IP is excluded from the automatic acquisition range, and the setting is changed so that it is not allocated to other terminal devices by automatic acquisition.

Next, the operation of each function of the host device 11 will be described with reference to the flowcharts of FIGS.
FIG. 2 is a flowchart of the operation of examining the IP address operation performance of each network segment, which is the operation of the IP address operation investigation unit.
Hereinafter, the operation to be investigated is automatically performed at a predetermined time or interval.
First, the network segment table 111 is accessed, and the management IP address of each record is obtained sequentially (S101). Next, it is determined whether or not all the records in S101 have been completed (S102). If it has not been completed (the state in which the record of the network segment table 111 remains), the process proceeds to S103. When all the records have been completed, that is, when the acquisition and registration of IP-ARP data for all networks have been completed, the processing is terminated.

The use presence / absence item in the acquisition record is searched, and if “present”, the process proceeds to S104 (S103). If “no”, the process returns to S101 to acquire the next record. Connect to the acquired management IP address using TELNET (S104). At this time, if the connection is not possible (S105), an e-mail notification or the like is performed to the administrator registered in advance, and the process ends after giving a warning (S109). When the connection is successful, the IP-ARP table 112 acquisition command for the management IP address acquired in S101 is acquired from the record of the command table 203 (see FIG. 7) (S106). Next, the acquired command is issued on TELNET (S107). When the command is issued, a list of data that is a pair of the IP address and the MAC address held in the network device of the connection destination is displayed on the screen, and is fetched (S107). All the data fetched in S107 is registered in the IP-ARP table 112 (S108). Thereafter, the process returns to S101 to acquire the next record.

FIG. 3 is a flowchart of the operation of automatically expanding the network when there is no surplus in each network segment, which is the operation of the network segment automatic expansion unit.
The following operations are effective by executing the processing basically after the IP address operation checking unit 101 ends. First, the network segment table 111 is accessed to sequentially acquire records (S201). Next, it is determined whether the use / non-use item data in the acquired record is “present” or “not present” (S202). In the case of “Yes”, the DHCP start IP, the DHCP end IP, and the IP allowable number are acquired from the acquired record data (S203). Next, the IP-ARP table 112 is accessed, and the number of IPs of terminals operating in the DHCP range by matching with the data in the IP-ARP table 112 in the range from the DHCP start IP to the DHCP end IP obtained in S203. Is calculated (S204).

  Next, the difference in the number of IPs of the operating terminals calculated in S204 is calculated from the IP allowable number in the record acquired in S201 to obtain the IP allowable remaining number (S205). Next, it is determined whether or not the difference (the number of surplus IPs) is 0 (S206). If the difference is 0, similar to S108 of the IP address operation investigation unit 101, a mail notification or the like is performed to a previously registered administrator to notify that the surplus IP of the IP segment is 0 (S208). ). From the next step, the operation proceeds to the operation of automatically extending the segment for which the surplus IP = 0 is determined in the above step (S209 to S224).

First, in order to investigate an empty segment for expansion, access is sequentially made from the first record of the network segment table 111 (S209). It is determined whether the read record is completed (S210). If a record remains, it is determined whether the use / non-use item of the record is “present” or “absent” (S211). If “Yes”, the process returns to S209 and the next record is read. In the case of “None”, it is determined as an expansion segment. A management IP address is acquired from the record without surplus IP acquired in S201 (S212), and TELNET access is performed to the acquired IP address (S213). If the connection is not possible (S214), an e-mail notification or the like is performed to a previously registered administrator, a warning is given, and the process is terminated (S224). When the connection is successful, the VLAN-ID is set to the variable A from the network segment record without surplus IP acquired in S201, the default gateway is set to the variable B from the unused network segment record acquired in S209, and the same subnet The mask is substituted for variable C (S215).
The connection method using TELENET is a standard method for remotely operating a computer connected to a network, and by starting a client's TELNET service (software) and inputting a text-based command, Operate a remote device connected to the Nethawk. Since this software is built in an OS such as Windows as standard, no special software installation work is required.

  Next, the management IP is acquired from the network segment record without surplus IP acquired in S201, the command table 113 is accessed, and the multi-netization command of the record having the management IP is acquired. Then, a command is issued on the TELNET using the variables A, B, and C substituted in S215 to the acquired multi-netization command, and the segment is expanded (S216). By executing this command, an unused network can be associated with a network having no surplus IP, and both addresses can be used in a subordinate network. However, the number of IP addresses that can be automatically acquired does not change unless the DHCP server setting is changed. Therefore, the setting of the DHCP server is changed from S217.

  A TELNET connection is made to the DHCP server 13 (S217). Here, the IP address of the DHCP server 13 is registered in the storage unit of the host device 11 in advance. If the connection is not possible (S218), an e-mail notification or the like is performed to the administrator registered in advance, and the process is terminated after warning is performed (S224). If the connection is successful (S218), the network address is set to variable A, the subnet mask is set to variables B and D, the default gateway is set to variable C, and DHCP is acquired from the record of the unused extension network segment acquired in S209. The range start IP is acquired as a variable E, and the DHCP range end IP is acquired as a variable F (S219). The variable A-F acquired in S219 is substituted for each variable of the DHCP range definition command in the DHCP command table 1132 (S220). Edit the DHCPconfig file saved in the DHCP server, search for the same segment as the network segment without surplus IP acquired in S201, and immediately after that insert the DHCP range definition command obtained in S220 and save the file (S221).

Thereafter, a service restart command is acquired from the DHCP command table 1132 to reflect the Config file edited in S221 on the service, and the command is executed on the TELNET (S222). Finally, the network segment table 111 is accessed, and the use / non-use item of the record of the extension unused network segment acquired in S209 is changed from “none” to “present” (S223). Thereafter, it is investigated whether or not the processing has been performed for all the network segments.
If not completed, the process returns to S201 to read the next record.
If the result of S202 is “None”, if the record ends in S210, the process jumps to S207 to determine whether the record in the network segment table 111 is completed. Also ends. If the record remains, the process returns to S201 to read the next record.

FIG. 4 is a flowchart showing the operation of the fixed IP address determination and reflection unit, which automatically allocates a free IP based on the operation investigated by the IP address operation investigation unit when the user desires a fixed IP. .
The operation basically brings about an effect by performing the processing continuously after the operation of the IP address examining unit 101 is completed.
First, a user who desires a fixed IP address performs Web access to the host apparatus 11 from a terminal apparatus already connected to the network using a browser (s301). At this time, the terminal device to be used may be from anywhere as long as it is an environment in which Web access to the host device 11 is possible. The host device 11 displays the fixed IP address information input screen 301 (see FIG. 8) on the screen of the terminal device accessed by the user (S302). The user inputs the items of the network address 3012 for which the fixed IP is desired, the MAC address 3013 of the application terminal, and the desired setting method 3014 for the fixed IP address on the screen, and then clicks an OK button 3015 (S303).

  For each item input by the user in S303, it is checked whether there is no entry or selection omission (S304). If there is an entry or omission, the process returns to S302 to prompt the user to input again. If the check is passed, the IP-ARP table 112 is accessed, and the data in the range from the DHCP start IP to the DHCP end IP of the record having the same network address as the desired network address 3012 input in S303 is extracted and sorted in ascending order. (S305). Next, the data sorted in S305 are read sequentially (S306). Next, the end of the record read in S306 is determined. If the record has ended, it is determined in S303 that there is no free IP address in the network segment desired by the user (S307), and the process proceeds to the network segment automatic extension unit 102. (S308) After extending the segment, the process returns to S305 to re-search for a free IP address. When the read record remains (S307), the process proceeds to S308.

Next, the record read in S306 is compared with the record read in S306 before (S308). At this time, in the case of the first record, since there is no previous record, it is processed as “YES”. When the records are compared and the host address part is a serial number, it is determined that there is no empty address between them, and the process returns to S306 to read the next record.
If it is not a sequential number, it can be determined that there is an empty IP address between the previous record and the host address portion + 1 address of the previous record is determined as an allocation fixed IP (S309). Next, a subnet mask and a default gateway are acquired from the network address record (S310). The desired network address 3012 input by the user in S303, the application terminal MAC address 3013, the desired setting method 3014, the fixed IP for allocation determined in S309, the subnet mask acquired in S310, and the default gateway are used as the fixed IP address determination selection screen 302. It is displayed on the terminal device screen (S311).

The user clicks one of “Determine” 3028, “Redo” 3029, and “End” 3030 on the information displayed on the screen (S312). Next, the process branches depending on the result selected by the user in S312 (S313). When the end is selected, the flow ends as it is.
If redo is selected, the process returns to S302 and returns to the user input screen. If determination is selected, the process proceeds to S314. Since the fixed allocation IP has been determined, the configuration of the DHCP server 13 is changed from now on so that the fixed allocation IP is not leased by DHCP. Here, “leased by DHCP” means that a dynamic IP address is assigned to a client having a connection request. In other words, by changing the config so that the IP address determined to be a fixed IP is not assigned to a client that has a connection request, the DHCP server says “This address is exclusively for Mr. A and should not be assigned to another person. Recognize that.

  First, a TELNET connection is made to the DHCP server 13 (S314). Next, a connection determination is made (S315). If the connection is impossible, an e-mail notification or the like is performed to a previously registered administrator, a warning is given, and the process ends (S326). If the connection is successful, the DHCPconfig file saved in the DHCP server 13 is edited, and the DHCP range definition of the assigned fixed IP network address determined in S309 is retrieved and acquired (S316). Next, it is determined whether there are a plurality of DHCP range definitions acquired in S316 (S317). The DHCP range definition describes and defines the first IP and the last IP in the DHCP address range, and is a range line of the DHCP range definition command referred to in the DHCP command table 1132. That is, it indicates the range [variable E] and [variable F] in the DHCP command table 1132 shown in FIG.

  In the case of a segment to which no fixed IP address is assigned, there is one range line. However, when a fixed IP is assigned, the DHCP range is defined excluding the IP. For example, if the network segment is 10.80.1.0, the DHCP start IP is 6, the end IP is 254, and the fixed allocation IP is 10, range 10.80.1.6 10.80.1.9 and range 10. It will be defined over two lines, 80.1.11.10.80.1.254.

  If the determination in S317 is YES, only the range definition including the assigned fixed IP is extracted from the plurality of range definitions (S327), and the process proceeds to S318. In the case of NO, the process proceeds to S318 as it is. After extracting the range, it is determined where the assigned fixed IP is located in the range. For the determination, three determinations of the upper limit, the upper limit to the lower limit, and the lower limit are performed, and the range definition is performed in each case. That is, it is determined whether or not the lower limit host IP (S318) of the range definition extracted from S316 or S327 is the same as the host IP of the fixed allocation IP determined in S309, and in this case, the lower limit IP is not leased by DHCP. Then, the lower limit host IP of the range definition is changed to an IP obtained by adding 1 (S328), and the process proceeds to S321. If they are different, it is determined whether or not the upper limit host IP of the range definition extracted from S316 or S327 is the same as the host IP of the allocation fixed IP determined in S309. Is not leased, the upper limit host IP in the range definition is changed to -1 (S329), and the process proceeds to S321.

  When the host IP address determined in S309 is different from the upper and lower limits of the acquisition range, the range definition is defined from the lower limit to (assignment fixed IP host IP-1), and (assignment fixed IP host IP + 1) to the upper limit. The range is divided into two IP range definitions (S320). Next, two definitions are implemented according to the setting method desired by the user. There are two types of methods: a method of defining a fixed IP address as a fixed IP at a terminal and a method of setting an automatic acquisition setting and fixing an IP leased by the DHCP server 13. Processing branches at S303 according to the setting method desired by the user (S321). When the fixed IP is set on the terminal side, the edited DHCPconfig file is saved (S322).

  Next, in order to reflect the file, a service restart command is acquired from the DHCP command table 1132 and the command is executed on the TELNET (S323). The user sets the fixed IP for assignment determined in S309 displayed on the screen in S312, the subnet mask acquired in S310, and the default gateway in the fixed IP desired terminal device, and ends the flow (S324). When setting as a fixed IP on the DHCP server 13 side, a fixed IP assignment command is acquired from the DHCP command table 1132 (S330). The serial number in the acquired command may be anything as long as it is unique in the DHCPconfig file. For the variable A, the MAC address of the terminal device input by the user in S303 is substituted and added to the config file. Next, the edited dhcpconfig file is saved (S331). Next, in order to reflect the file, a service restart command is acquired from the DHCP command table 1132 and the command is executed on the TELNET (S332). Finally, the user performs network connection, restart or IP reacquisition of the terminal device with the applied MAC address (S333), and the flow is terminated.

FIG. 5 is an explanatory diagram of a database (network segment table).
The network segment table 111 includes a network address (A), a subnet mask (B), a default gateway (C), a management range (D), a DHCP start IP (E), a DHCP end IP (F), an IP allowable number, and usage. There are columns for presence / absence, management IP address, and VLAN-ID, and the contents are registered respectively.
Here, the segment refers to individual networks (subnets) constituting a large-scale communication network.
The subnet mask is a value indicating a delimitation position between an address (network address) of a subnet to which the computer belongs, which forms an IP address, and an address (host address) of the computer itself in the subnet.
Also, the default gateway refers to a computer (router) or other device (address) that represents a gateway used to access a computer outside the network to which the terminal belongs.
The management IP address is an IP address that is an identification number assigned to each computer or communication device connected to an IP network such as the Internet or an intranet. Here, a device that manages subnets (segments) is used. Indicates the IP address of (L3 switch).
VLAN-ID refers to an identifier (ID) for identifying a VLAN, which refers to setting a virtual group of terminals independently of a physical connection form in a corporate network. .

FIG. 6 is an explanatory diagram of a database (IP-ARP table).
The IP-ARP table 112 has columns for IP address and MAC address, and the contents of each are registered.
FIG. 7 is an explanatory diagram of a database (command table), in which (3) -1 describes a network device command table 1131 and (3) -2 describes a DHCP command table 1132. The network device command table includes columns for a management IP address, a manufacturer, an ARP acquisition command, and a multi-net command, and the contents of each are registered. In addition, the DHCP command table has command name and command content fields, and a service restart command, a DHCP range definition command, and a fixed IP allocation command are registered as the command name, and details of each command name are registered in the command content. Has been.

FIG. 8 is an explanatory diagram of a screen (fixed IP address information input screen).
On the fixed IP address information input screen 301, a screen name 3011, a desired network address 3012, an application terminal MAC address 3013, a desired setting method 3014, and an OK button 3015 are displayed.
FIG. 9 is an explanatory diagram of a screen (fixed IP address determination selection screen).
The fixed IP address determination selection screen 302 displays a screen name 3021, an application motto work address 3022, an application terminal MAC address 3023, an assigned fixed IP address 3025, a subnet mask 3026, a default gateway 3026, and a desired setting method 3027. A button 3028, a redo button 3028A, and an end button 3029 are displayed at the bottom.

1 is a block diagram of an automatic fixed IP acquisition and network automatic expansion apparatus according to an embodiment of the present invention. FIG. It is an operation | movement flowchart of the IP address operation | movement investigation part in FIG. It is an operation | movement flowchart of the network segment automatic expansion part in FIG. It is an operation | movement flowchart of the fixed IP address determination reflection part in FIG. It is a block diagram of the network segment table in this invention. It is a block diagram of the IP-ARP table in this invention. It is a block diagram of the command table in this invention. It is a screen block diagram of the fixed IP address information input screen in this invention. It is a screen block diagram of the fixed IP address determination selection screen in the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Network 11 Host apparatus 12 Layer 3 switch 13 DHCP server 14 Terminal apparatus 15 Terminal apparatus 101 IP address operation | movement investigation part 102 Network segment automatic expansion part 103 Fixed IP address determination reflection part 111 Network segment table 112 IP-ARP table 113 Command table 301 Fixed IP address information input screen 3011 Fixed IP address information input screen title 3012 Desired network address selection input location 3013 Application terminal MAC address input location 3014 Desired setting method selection location 3015 Confirm button 302 Fixed IP address decision selection screen 3021 Fixed IP address decision selection Screen title 3022 Application network address display location 3023 Application terminal MAC address display location 3024 Allocation fixed IP address display location 3025 Subnet mask display location 3026 Default gateway display location 3027 Desired setting method display location 3028 Enter button 3028A Redo button 3029 End button 1131 Network device command table 1132 DHCP command table

Claims (5)

A network relay device, a host device connected to the network relay device via a network, a DHCP server device connected to the network relay device via a network, and a plurality of terminal devices accommodated in the server device; In the fixed IP address setting method having
When the terminal device owned by the user requests acquisition of a fixed IP, the terminal device selects the desired network address, the target terminal MAC address, and the fixed IP desire setting method from the Web to the host device,
The host device acquires IP address operation information from the IP-ARP table held by the network relay device, assigns a non-operating and minimum IP from the DHCP range of the network address as a fixed IP, and the DHCP server Exclude fixed IP from the DHCP lease range of
In the case of setting as a fixed IP for automatic acquisition setting in the terminal device, the DHCP server sets a combination of the MAC address inputted by the user and the fixed allocation IP, and always assigns the allocated IP to the terminal. A method for setting a fixed IP address in a DHCP environment, characterized by assigning. The fixed IP address setting method in the DHCP environment according to claim 1,
In the IP address operation data acquired from the IP-ARP table held by the network relay device, if there is no free IP in the DHCP range of the network address desired by the user, it is held in the host device. An IP segment automatic extension method, wherein a free network segment is automatically extracted from a network segment table, a desired network address of the network relay device is multi-netted, and the segment is automatically extended. When a user requests acquisition of a fixed IP, a host device that assigns a fixed IP address to a terminal device owned by the user, a network relay device that coordinates communication between network segments, and an automatic IP acquisition of the terminal device A fixed IP address setting system comprising a DHCP server enabling
The host device includes
IP address operation investigation means for investigating operation results of IP addresses connected to the network in which the host device is accommodated;
A network segment automatic extension means for extending a segment in which the surplus IP of the IP address disappears;
A fixed IP address determination reflecting means for assigning a fixed IP address when a fixed IP address is requested by the user;
Network segment table storage means storing all segment information of the network;
IP-ARP table storage means for storing IP address operation result data;
A fixed IP address setting system comprising command table storage means for storing various commands to be executed to the network relay device and the DHCP server. Means for accessing the network segment table and sequentially acquiring records;
Means for determining the presence / absence of the data of the presence / absence item in the acquisition record,
If yes, means for matching the IP-ARP table data in the range from the acquired record data to the DHCP start IP, DHCP end IP, and calculating the number of IPs of terminals operating in the DHCP range;
Means for calculating the difference in the number of IPs of the operating terminals from the IP permissible number in the acquired record to obtain the IP permissible remaining number;
Means for determining whether the difference is 0;
When the difference is 0, in order to investigate the free segment for expansion, access is sequentially made from the first record of the network segment table, and the use / nonuse of the record is judged. Means,
Means for acquiring a management IP address from a record having no surplus from the network segment table and connecting to the acquired management IP address;
Means for acquiring the VLAN-ID of the network having no surplus from the network segment table and the default gateway and subnet mask of the unused network from the network segment table, and substituting them into variables, respectively.
Means for obtaining a multi-net command of the network device from a command table, and issuing a command with variables substituted;
Means for connecting to a DHCP server;
A means for obtaining a network address, subnet mask, default gateway, DHCP range start IP and end IP of the unused network from the network segment table if connected;
Means for substituting each variable into a DHCP range definition command variable obtained from the DHCP command table;
A means for searching for a surplus 0 network range from a DHCPconfig file stored in the DHCP server, and immediately after that, inserting a DHCP range definition command into which a variable has been substituted, and storing the config;
Means for obtaining and executing a DHCP service restart command from the DHCP command table;
An IP segment expansion system comprising: means for accessing the network segment table and changing whether or not the network address defined in the multi-net is used from nothing to presence. A program for setting a fixed IP address in a DHCP environment,
When a host device computer requests acquisition of a fixed IP from a terminal device, and the desired network address, target terminal MAC address, and fixed IP desired setting method are selected from the terminal device via the Web, the network relay device holds Obtaining IP address availability information from the IP-ARP table, assigning a non-operating and minimum IP from the DHCP range of the network address as a fixed IP, and excluding the assigned fixed IP from the DHCP lease range of the DHCP server ,
When the terminal device is set as a fixed IP for automatic acquisition setting, a combination of the MAC address input by the user and the fixed allocation IP is set in a DHCP server computer, and the allocated IP is always set. A program for setting a fixed IP address in a DHCP environment for executing a procedure assigned to each terminal.

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