JP2015162742A - Inter-network relay apparatus, data communication system with the same, and image formation system - Google Patents

Inter-network relay apparatus, data communication system with the same, and image formation system Download PDF

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Publication number
JP2015162742A
JP2015162742A JP2014035627A JP2014035627A JP2015162742A JP 2015162742 A JP2015162742 A JP 2015162742A JP 2014035627 A JP2014035627 A JP 2014035627A JP 2014035627 A JP2014035627 A JP 2014035627A JP 2015162742 A JP2015162742 A JP 2015162742A
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ip address
plurality
servers
relay device
ip addresses
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JP2014035627A
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直行 山内
Naoyuki Yamauchi
直行 山内
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株式会社リコー
Ricoh Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an inter-network relay apparatus including a function by which IP address contention with a communication partner can be automatically avoided even when a plurality of IP addresses are internally used on a communication system configuration.SOLUTION: A relay apparatus 210 is configured to relay data communications between client terminals 101-103 connected to a global network 100 in a data communication system and servers 201-20n connected to a local network 200. The relay apparatus 210 includes: IP address management means for managing IP addresses that the servers 201-20n internally use; IP address contention detection means for analyzing communication data from the terminals 101-103 to detect the contention between IP addresses included in the communication data and the IP addresses relating to the servers 201-20n; and novel IP address application means for allocating and applying another novel IP address to a contention server in the case where there is the contention between the IP addresses of the terminals 101-103 and the IP addresses of the servers 201-20n.

Description

  The present invention relates to an inter-network relay device that relays data communication between a plurality of first devices that are network-connected to each other belonging to a private space and a plurality of second devices that are network-connected to each other belonging to a global space And a data communication system including the same, and an image forming system.

  Conventionally, image formation of a multifunction peripheral (Printer Peripheral / Printer / Product) specification that is a digital multi-function peripheral in which a plurality of functions such as a printer function, a copier function, a scanner function, and a facsimile function are combined in a single casing. Some devices such as apparatuses have a plurality of computer functions. Since these devices cannot be managed as a single device on the network, there is a demand for integrating them into a single IP (Internet Protocol) address. For this reason, an address translation function called NAPT (Network Address Port Translation) or IP masquerade (Masquerade), which can share one IP address among a plurality of computers, has been developed.

  As a well-known technique related to sharing such a single IP address among a plurality of computers, even if an internal node is exchanged for another node, the network information is always properly maintained without bothering the administrator. Examples include “inter-network connection device” (see Patent Document 1) that enables management, thereby reducing the burden on the administrator and enabling highly reliable routing processing.

  The technique described in Patent Document 1 described above discloses an address conversion function that relays data communication between a global space and a private space for the purpose of facilitating the management of internal terminals, and specifically belongs to the private space. A function to manage the device properly by detecting the change of the IP address of the device by managing the MAC (Media Access Control) address by grasping the network I / F information of the device to be managed. .

  However, in the mechanism for sharing an IP address in the technique described in Patent Document 1, since a plurality of IP addresses are used internally in the communication system configuration, the actually applied IP address is the IP address of the communication partner. If this occurs, there is a problem that data communication cannot be continued. In such a case, since it is necessary to manually change and set the IP address, there is a problem in that it takes time and effort in terms of operation.

  The present invention has been made to solve such a problem, and the technical problem is that even if a plurality of IP addresses are used internally in the communication system configuration, IP address conflicts with the communication partner will occur. An object of the present invention is to provide an inter-network relay device having a function that can be automatically avoided, a data communication system including the same, and an image forming system.

  In order to solve the above technical problem, the present invention provides a network between a plurality of first devices connected to each other belonging to a private space and a plurality of second devices connected to each other belonging to a global space. In an inter-network relay device that relays data communication, an IP address management unit that manages an IP address used internally by a plurality of first devices, and communication data from the plurality of second devices are analyzed. IP address conflict detection means for detecting conflicts between IP addresses included in the data and IP addresses related to the plurality of first devices, and IP addresses related to the plurality of second devices based on detection results by the IP address conflict detection means, When there is a conflict with IP addresses related to a plurality of first devices, it is separated from the conflicting first device. Characterized by comprising a new IP address application means for applying to assign a new IP address, the.

  According to the inter-network relay device of the present invention, the IP addresses used internally by the plurality of first devices connected to each other belonging to the private space are stored and managed, and the mutual network belonging to the global space is connected to the network. When an IP address conflict is detected by analyzing the contents of all data communications from the plurality of connected second devices, an IP address used internally for the conflicting first device is changed to another new IP address. Since it has a function of assigning and applying an address, data communication is continued even if the IP address related to the second device and the IP address related to the first device (IP address used for NAPT in the apparatus) compete. As a result, even if multiple IP addresses are used internally on the communication system configuration, Consisting of an IP address conflict can be automatically avoided.

1 is a diagram illustrating a schematic configuration of an entire data communication system including an inter-network relay device according to an embodiment of the present invention. It is the block diagram which showed the detailed structure of the relay apparatus between networks with which the data communication system shown in FIG. 1 is equipped. FIG. 2 is a functional block diagram showing the contents of processing functions of an inter-network relay device provided in the data communication system shown in FIG. 1. 3 is a flowchart showing an IP address management operation process for a plurality of servers belonging to a private space by an inter-network relay device provided in the data communication system shown in FIG. 2 is a flowchart showing an operation process for avoiding IP address conflict between a plurality of client terminals belonging to a global space and a plurality of servers belonging to a private space by an inter-network relay device provided in the data communication system shown in FIG. 3 is a flowchart showing an operation process of assigning a new IP address to a server belonging to a private space when an IP address conflict occurs by an inter-network relay device provided in the data communication system shown in FIG.

  Embodiments of an inter-network relay device, a data communication system including the same, and an image forming system according to the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a diagram showing a schematic configuration of an entire data communication system including an inter-network relay device 210 according to an embodiment of the present invention. This data communication system includes a plurality of (here, N) first devices 201, 202, and 20N connected to each other via a local network 200 belonging to a private space, and a global network 100 belonging to a global space. A plurality of (here, three) second client terminals 101, 102, and 103 connected to each other, and a relay device 210 that is connected to the local network 200 and the global network 100 in a wired manner and a wireless manner, respectively. And the data communication between the client terminals 101, 102, and 103 and the servers 201, 202, and 20n is performed via the relay device 210.

  In this data communication system, the servers 201, 202 and 20N share one global IP address and perform data communication. The sharing of the IP address is realized by the relay device 210 to which the NAPT mechanism is applied. The relay device 210 has two NICs (Network Internet Controllers) for relaying data communication between the global network 100 and the local network 200, and manages IP addresses used internally by the servers 201, 202, and 20N. . Further, the relay device 210 has a function of detecting an IP address conflict by analyzing data communication between the servers 201, 202, and 20N and the client terminals 101, 102, and 103.

  FIG. 2 is a block diagram illustrating a detailed configuration (hardware configuration) of the relay device 210. The relay device 210 is used as a working memory when performing a CPU 211 that executes a control program, an EPROM 212 that stores the control program, and data communication relay processing and IP address management of the servers 201 to 20N in the hardware configuration. RAM 213 and Ether (trademark registration) 214 and 215 connected to the CPU 211 and used for network communication.

  FIG. 3 is a functional block diagram showing the contents (software configuration) of the processing function of the relay device 210. The relay device 210 responds to an IP address acquisition request from the communication control unit 216 that controls the relay operation in data communication between the client terminals 101 to 103 and the servers 201 to 20N and the servers 201 to 20N on the software configuration. And an internal IP address management unit 217 for managing IP addresses assigned to the servers 201 to 20N.

  That is, in the relay device 210 according to the embodiment, the internal IP address management unit 217 functions as an IP address management unit that manages IP addresses used internally for the servers 201 to 20N, and the RAM 213 is an IP address related to the servers 201 to 20N. Acts as a storage means for storing In addition, the communication control unit 216, the CPU 211, and the Ethers 214 and 215 connected thereto cooperate to analyze the communication data from the client terminals 101 to 103, and to determine the IP address included in the communication data and the servers 201 to 20N. In addition to functioning as an IP address conflict detection means for detecting conflicts with such IP addresses, as a result of the detection, the server that competes when the IP addresses related to the client terminals 101 to 103 and the IP addresses related to the servers 201 to 20N compete. It acts as a new IP address applying means for assigning and applying another new IP address.

  In short, in this relay device 210, the CPU 211 reads from the EPROM 212 as processing when performing IP communication with the client terminals 101 to 103 belonging to the global space and IP address management related to the servers 201 to 20N belonging to the private space. According to the control program, the IP address management means by the internal IP address management unit 217 manages and grasps the IP addresses used internally by the servers 201 to 20N, and the communication control unit 216 and the CPU 211 and the Ether 214 connected thereto, The IP address conflict detection means according to 215 detects the IP address conflict by analyzing the content of communication with the communication partner, and when an IP address conflict is detected, the communication control unit 216, the CPU 211, and the connected to this Ether21 215, the new IP address applying means changes the IP address to another new IP address (hereinafter referred to as a new IP address) for the server of which the IP address conflict is among servers 201 to 20N. It has become.

  Therefore, in the data communication system shown in FIG. 1, even if a plurality of IP addresses are internally used for the servers 201 to 20N in the communication system configuration, IP address conflict with the communication partner is automatically avoided. It will have a function that can.

  FIG. 4 is a flowchart showing an IP address management operation process for the servers 201 to 20N belonging to the private space by the relay device 210. Referring to FIG. 4, IP address management of the local network 200 area is shown here. First, the server 201 makes an IP address acquisition request (Step 1) to the relay device 210 and receives the request. 210 stores the IP address distributed to the server 201 (Step 2) and then designates IP address 1 to the server 201, whereby the server 201 applies the designated IP address 1.

  Next, after the server 202 makes an IP address acquisition request (Step 3) to the relay device 210 in the same procedure, the relay device 210 that has received the request stores the IP address distributed to the server 202 (Step 4). The IP address 2 is designated for the server 202, and the server 202 applies the designated IP address 2 accordingly.

  Further, the server 20N makes an IP address acquisition request (Step 5) to the relay device 210 in the same procedure, and stores the IP address distributed to the server 20N by the relay device 210 that has received the request (Step 6). The IP address N is designated for 20N, and the server 20N applies the designated IP address N by this.

  Incidentally, the IP address acquisition request (Steps 1, 3, and 5) by the servers 201 to 20N in FIG. 4 has a mechanism such as DHCP (Dynamic Host Configuration Protocol) as a specific means. When the relay device 210 distributes IP addresses to the servers 201 to 20N, it stores which IP address is assigned to which server (Steps 2, 4, and 6).

  FIG. 5 is a flowchart showing an operation process for avoiding IP address conflict between the client terminals 101 to 103 belonging to the global space and the servers 201 to 20N belonging to the private space by the relay device 210. Referring to FIG. 5, here, it corresponds to the main point of the operation processing of the entire data communication system. First, the clients 101 to 103 use any function usage request (Step 1) of the servers 201 to 20N as a request packet. Transmit to the relay device 210.

  The relay device 210 checks whether or not the IP address of the request source for the request packet conflicts with the IP addresses of the servers 201 to 20N (Step 2). As a result of the check, if it is determined that there is a conflict, a process of changing the IP address range assigned to the servers 201 to 20N in the local network 200 area (Step 3) is performed. In Step 3, the IP address range distributed by DHCP is changed to a non-conflicting IP address range. Thereafter, the relay device 210 sends a non-conflicting IP address (new IP address 1) to the server 201 and performs processing for instructing resetting of the IP address (Step 4). A process of resetting the received IP address (new IP address 1) to itself (Step 5) is performed, and after the resetting, the relay device 210 responds to the end of the setting.

  Subsequently, the relay device 210 sends a non-conflicting IP address (new IP address 2) to the server 202 and performs a process of instructing resetting of the IP address (Step 6). In response to this, the server 202 is notified from the relay device 210. The IP address (new IP address 2) is reset to itself (Step 7). After resetting, the relay device 210 responds to the end of the setting.

  Further, the relay device 210 sends a non-conflicting IP address (new IP address N) to the server 20N, and performs a process for instructing resetting of the IP address (Step 8). In response to this, the server 20N is notified from the relay device 210. The IP address (new IP address N) is reset to itself (Step 9). After resetting, the relay device 210 responds to the end of setting. Therefore, the relay device 210 proceeds to the relay processing (Step 10) of the server function use request sent in Step 1, specifies the server that provides the service corresponding to the server function use request from the destination port number, etc. Relay to

  Also, as a result of checking whether the previous IP address is in conflict (Step 2), if it is determined that there is no conflict (Step 11), it is confirmed that relay processing is being performed, and the port number included in the request is supported. After performing the process of specifying the server providing the service to be performed, the process of transferring the request to the servers 201 to 20N is performed, and then the response from the servers 201 to 20N is transferred to the client terminals 101 to 103. After this, the state changes to a standby state.

  In short, in the basic processing in FIG. 5, when the relay device 210 instructs the server 201 to the server 20N to reset the IP address (Steps 4, 6, and 8), the new IP address that does not conflict with the client terminals 101 to 103 1, 2, and 3 are distributed, and the servers 201 to 20 N set the new IP addresses 1, 2, and 3 sent from the relay device 210 to themselves (Steps 5, 7, 9).

  FIG. 6 is a flowchart showing an operation process for assigning a new IP address to the server 201 belonging to the private space when an IP address conflict occurs by the relay device 210. FIG. 6 shows detailed items when the relay device 210 in FIG. 5 instructs the server 201 to the server 20N to reset the IP address (Steps 4, 6, and 8). A case will be described in which a new IP address is assigned to the server 201 when an IP address conflict occurs. However, a new IP address can be assigned to the other servers 202 and 20N in the same manner. .

  Referring to FIG. 6, first, in order to send a request for acquiring a new IP address from the server 201 to the relay device 210, a message for prompting the server 201 to request an IP address acquisition from the relay device 210. Send (Step 1). If a general DHCP server-client mechanism is introduced, this message may be any message that induces an IP address acquisition request from the servers 201 to 20N, and corresponds to a DHCP FORCERENEW message and a DHCPv6 Reconfigure message. However, the message is not limited to these two messages. As another means, for example, a DHCP client function restart request message can be used. In any case, it is expected that an IP address acquisition request will be issued from the DHCP client after the execution of these messages.

  Next, the server 201 that has received the message performs a process of sending an IP address acquisition request to the DHCP server (Step 2) in order to issue an IP address acquisition request to the relay device 210. The relay device 210 transmits a non-conflicting IP address (new IP address) to the server 201 together with the response to the Step 2 IP address acquisition request (Step 3). The new IP address is assigned an IP address different from the IP address competing with the IP addresses of the client terminals 101 to 103. By applying a new IP address that is different from the conflicting IP address, it is possible to reduce the risk of IP address conflicts occurring again.

  Further, the server 201 sets the distributed IP address in itself (Step 4) and applies it to the new IP address sent in Step 3, and responds to the relay device 210 that the setting is completed after resetting. The relay device 210 that has received the setting response from the server 201 then transitions to a standby state.

  The data communication system according to the embodiment described with reference to FIG. 1 exemplifies a configuration having three client terminals 101 to 103 connected to the global network 100 belonging to the global space. The number of data communication systems to which the relay device 210 is applied is not limited to the disclosed one.

  The data communication system described in the embodiments is a multi-function that is a digital multi-function peripheral in which a plurality of functions including at least a printer function, a copier function, a scanner function, and a facsimile function are combined in a single casing. When applied to an image forming apparatus of a peripheral device (MFP) specification and the client terminals 101 to 103 have a driver function for outputting an image forming instruction to the image forming apparatus, the image forming system is configured. Is.

100 Global network 101, 102, 103 Client terminal 200 Local network 201, 202, 20N Server 210 Relay device 211 CPU
212 EPROM
213 RAM
214, 215 Ether
216 Communication control unit 217 Internal IP address management unit

JP 2010-199738 A

Claims (4)

  1. In an inter-network relay device that relays data communication between a plurality of first devices connected to each other belonging to a private space and a plurality of second devices connected to each other belonging to a global space,
    IP address management means for managing IP addresses used internally by the plurality of first devices; analyzing the communication data from the plurality of second devices; and IP addresses included in the communication data; IP address conflict detection means for detecting conflicts with the IP addresses related to a plurality of first devices, and the IP addresses related to the plurality of second devices based on detection results by the IP address conflict detection means A new IP address applying means for assigning and applying another new IP address to the competing first device when the IP address related to the first device competes between networks Relay equipment.
  2.   2. The inter-network relay device according to claim 1, further comprising storage means for storing the IP addresses related to the plurality of first devices, wherein the plurality of first devices are servers connected to each other via a local network. The inter-network relay device, wherein the plurality of second devices are client terminals connected to each other via a global network.
  3.   The inter-network relay device according to claim 2, wherein the local network in which the plurality of servers are connected to each other and the global network in which the plurality of client terminals are connected to each other are connected in a wired manner and a wireless manner, respectively. A data communication system characterized by being configured.
  4.   4. The multi-function peripheral apparatus according to claim 3, wherein the plurality of servers are digital multi-function peripherals in which a plurality of functions including at least a printer function, a copier function, a scanner function, and a facsimile function are combined in one casing. (MFP: Multifunction Peripheral / Printer / Product) specification image forming apparatus, wherein the plurality of client terminals have a driver function of outputting an image forming instruction to the image forming apparatus .
JP2014035627A 2014-02-26 2014-02-26 Inter-network relay apparatus, data communication system with the same, and image formation system Pending JP2015162742A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105376343A (en) * 2015-11-26 2016-03-02 上海贝锐信息科技有限公司 Router address distribution method, router address distribution device and server in VPN

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002217941A (en) * 2001-01-12 2002-08-02 Matsushita Electric Ind Co Ltd Network address reallocating method and router
JP2005045505A (en) * 2003-07-28 2005-02-17 Toshiba Corp Communication controller and network associating method
JP2011126132A (en) * 2009-12-17 2011-06-30 Murata Machinery Ltd Image forming apparatus
JP2013098819A (en) * 2011-11-02 2013-05-20 Buffalo Inc Network communication device, method for selecting use network interface part, method for performing packet transmission/reception, computer program, and computer-readable recording medium

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002217941A (en) * 2001-01-12 2002-08-02 Matsushita Electric Ind Co Ltd Network address reallocating method and router
JP2005045505A (en) * 2003-07-28 2005-02-17 Toshiba Corp Communication controller and network associating method
JP2011126132A (en) * 2009-12-17 2011-06-30 Murata Machinery Ltd Image forming apparatus
JP2013098819A (en) * 2011-11-02 2013-05-20 Buffalo Inc Network communication device, method for selecting use network interface part, method for performing packet transmission/reception, computer program, and computer-readable recording medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105376343A (en) * 2015-11-26 2016-03-02 上海贝锐信息科技有限公司 Router address distribution method, router address distribution device and server in VPN

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