KR100623627B1 - Ip router for preventing faults of backborn network by controlling dhcp server and method for operating the ip router - Google Patents

Abstract

The present invention relates to providing an IP address of an IP router. More particularly, when a predetermined communication terminal is connected to a LAN interface unit of an IP router, an IP address request signal is transmitted to the communication terminal, and IP as a response data is provided. The present invention relates to a method and apparatus for stopping the IP router from providing an IP address when receiving an address.

According to the present invention, when the main network is connected to the LAN interface unit of the IP router, the IP router stops providing the private IP address, thereby preventing the communication failure of the communication network caused by the incorrect connection of the IP router. You can get it.

IP router, backbone network, network, IP address, network

Description

IP Router and PREFITING FAULTS OF BACKBORN NETWORK BY CONTROLLING DHCP SERVER AND METHOD FOR OPERATING THE IP ROUTER}

1 is a diagram illustrating a network structure of a backbone network according to the prior art.

2 is a diagram showing the internal configuration of an IP router according to the present invention.

3 is a flowchart illustrating a method of operating an IP router according to the present invention.

<Explanation of symbols for the main parts of the drawings>

200: IP Router

201: LAN interface unit

202: broadband network interface unit

203: IP address management module

204: protocol control unit

205: timer means

The present invention relates to providing an IP address of an IP router. More particularly, when a predetermined communication terminal is connected to a LAN interface unit of an IP router, an IP address request signal is transmitted to the communication terminal, and IP as a response data is provided. The present invention relates to a method and an apparatus for stopping providing an IP address of the IP router when receiving an address.

Computer terminals, which are widely used in society, use unique identification information called IP addresses to use the Internet. The IP address is stored internally as 32 bits (4 bytes), but when expressed, four decimal numbers are displayed separated by dots (.) And are currently assigned by the Internet Service Provider (ISP) system. There is a limit.

The IP address assigned from the Internet service provider system is generally referred to as a public IP address. For the purpose of efficient and personal use of the public IP address, an IP router is currently used in a local area network. The IP router converts one public IP address into one or more private IP addresses corresponding thereto or the one or more private IP addresses into one public IP address. This allows a plurality of computer terminals to perform Internet communication with one public IP address assigned from a predetermined Internet service provider system.

1 is a diagram showing a network structure of a backbone network in the prior art.

As shown in FIG. 1, in a backbone network, a plurality of computer terminals (PCs) are connected to one backbone network, and the computer terminals broadcast IP address discovery packets to the backbone network in order to perform Internet communication. Will be sent. A predetermined Internet Service Provider (ISP) system is connected to the backbone network with the computer terminal, and the Internet service provider system that receives the IP address request signal of the computer terminal allocates a public IP address to the computer terminal. The computer terminal assigned the public IP address can perform the Internet service.

In this way, an IP router is used to efficiently use the assigned public IP address. The IP router, like the computer terminal, transmits an IP address request signal to the Internet service provider system. The Internet service provider system that receives this assigns a predetermined public IP address to the IP router, and the IP router is connected to a plurality of PC # 1,... , Assign a private IP address to PC # N. The IP router remembers which PC the allocated private IP address is assigned to and arbitrates the data packets transmitted and received.

However, when the LAN interface part of the IP router is connected to the backbone network due to a user's mistake or ignorance, a problem occurs. When the main network is connected to the LAN interface of the IP router when the distance of the IP router is closer than the distance of the Internet service provider system from the PC connected to the main network, the IP router receives the IP address request of the PC first. As a result, the IP router transmits a predetermined private IP address to a PC of a backbone network, and the received PC recognizes the allocated private IP address as a public IP address allocated from a predetermined Internet service provider system. As a result, computer terminals located relatively close to the IP router cannot perform Internet service, which causes communication failure of the main network. Some users of the current IP routers intentionally or unintentionally connect the LAN interface of the IP router to the backbone network, and it is virtually impossible to track the wrongly connected IP router.

In addition, the above-mentioned problem is not limited to the backbone network but applies to all communication networks using IP addresses, and even if very few users connect the wrong IP routers, maintenance costs of network operators and communication failures of many network subscribers, etc. Numerous problems arise.

The present invention has been made to improve the prior art as described above, when connecting the backbone network to the LAN interface of the IP router, by causing the IP router to stop providing a private IP address that may occur due to incorrect connection of the IP router It aims to prevent communication failure of a communication network.

In the IP router to achieve the above object and solve the problems of the prior art, a broadband network (WAN) interface unit for connecting to a predetermined Internet service provider system, one or more ports for connecting to one or more communication terminals A LAN interface unit comprising: an IP address management module for providing a predetermined IP address to the at least one communication terminal upon receiving an IP address request signal from the communication terminal, and detecting a connection to a predetermined port of the LAN interface unit; A protocol for controlling an operation of the IP address management module by transmitting an IP address request signal through the port and determining whether a response data for the IP address request signal is received from a predetermined system connected to the port. And a controller, wherein the protocol controller manages the IP address. Set the initial operation of the module to (Disable), and if the IP data request signal does not receive the response data for the IP router, characterized in that (Enable) to enable the operation of the (IP address management module) Is provided.

In addition, in a method of operating an IP router according to the present invention, a LAN interface including a wide area network (WAN) interface unit for connection with a predetermined Internet service provider system and one or more ports for connection with one or more communication terminals. Maintaining a portion, and setting an operation of an IP address management module to disable, wherein the IP address management module sets a predetermined IP address to the one or more communication terminals when receiving an IP address request signal from the communication terminal. -Detecting a connection to a predetermined port of the LAN interface unit, transmitting an IP address request signal through the port, and response data to the IP address request signal from a predetermined system connected to the port Determining whether a signal has been received and responding to the IP address request signal. Enabling the operation of the IP address management module when the response data is not received, and the enabling of the operation of the IP address management module is performed in response to the IP address request signal. When receiving the response data, the method of operating an IP router comprising the step of maintaining the IP address management module (Disable) is provided.

Hereinafter, an IP router and an operating method according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram showing the internal configuration of an IP router according to the present invention.

As shown in FIG. 2, the IP router 200 according to the present invention includes a LAN interface unit 201, a broadband network interface unit 202, a protocol control unit 204, an IP address management module 203, and a timer means ( 205).

The LAN interface unit 201 includes one or more ports for connection with one or more communication terminals.

In the normal case, a predetermined communication terminal is connected to the port. The communication terminal is generally a computer terminal, hereinafter referred to as a computer terminal. Since the computer terminal does not have an IP address management module for providing an IP address, the computer terminal does not recognize when a predetermined IP address request signal is received, and thus can transmit response data including the IP address. none.

The broadband network interface unit 202 performs a connection with a predetermined Internet service provider system.

The IP router according to the present invention is connected to a predetermined Internet Service Provider (ISP) system through a predetermined backbone network. The backbone network includes not only the IP router and the Internet service provider but also one or more computer terminals which are allocated an IP address from the Internet service provider system to perform an Internet service. The Internet service provider system may comprise a predetermined Dynamic Host Configuration Protocol (DHCP) server. The computer terminal transmits an IP address request signal necessary for performing an Internet service to the Internet service provider system, and the Internet service provider system that receives the IP address request signal is predetermined from a dynamic host configuration protocol to the computer terminal. Send an IP address. Accordingly, the computer terminal may perform an operation as one host on a network.

When the IP address management module 203 receives an IP address request from the communication terminal, the IP address management module 203 provides a predetermined IP address to the one or more communication terminals.

The IP address management module 203 according to the embodiment of the present invention is a dynamic host configuration protocol server and may be implemented to be disabled by default settings.

According to another embodiment of the present invention, the IP address management module 203 is a network address translation (NAT) module, that is, an address of a communication network used to convert a private IP address into a public IP address in a network layer, which is the third layer of the OSI model. Converters can be used.

There are two main purposes of using the IP address management module 203 as described above. First, the public IP address of the Internet can be saved, and second, the intruder has a unique private network of users connected to the public network called the Internet. To protect against them.

The protocol controller 204 detects a connection to a predetermined port of the LAN interface unit 201 and transmits an IP address request signal through the port. In addition, the IP address management module 203 is controlled by determining whether the response data for the IP address request signal is received from a predetermined system connected to the port.

In the IP router according to the present invention, when a computer terminal using a predetermined IP address allocated from the IP router is connected to a port of the LAN interface unit 201, the protocol controller 204 recognizes this.

The computer terminal according to an embodiment of the present invention transmits a predetermined signal through the cable when power is applied, and the protocol control unit 204 according to the present invention detects this, indicating that the predetermined computer terminal is connected by a cable. I can recognize it.

Generally, an Internet service provider system receives an IP address request signal from a predetermined computer terminal and provides the predetermined terminal with an IP address as response data. The protocol control unit 204 determines whether a predetermined Internet service provider system is connected to the LAN interface unit 201. This is because, when a predetermined Internet service provider system is connected to the LAN interface unit 201, serious problems such as confusion of the IP address system mentioned in the prior art are caused. Accordingly, the protocol controller 204 transmits a predetermined IP address request signal to the computer terminal connected with the cable, and recognizes when receiving the response data for the IP address request signal.

The reception of the response data by the protocol controller 204 means that the computer terminal determines that the predetermined IP address providing system is capable of providing an IP address. Accordingly, the protocol controller 204 operates to disable the IP address allocation operation by controlling the IP address management module 203 in order to prevent confusion of the IP address system of the backbone network.

When the protocol control unit 204 according to the embodiment of the present invention receives the response data, if it remains disabled (disable) to the IP address management module 203, and does not receive the response data, The IP address management module 203 controls to be set from disabled to enabled.

According to the present invention, the IP router 200 may be implemented including a predetermined timer means 205. The IP address management module 203 transmits the IP address request signal, and the protocol control unit 204 operates the timer means 205. The protocol controller 204 frequently checks whether a predefined timeout condition is satisfied, and determines that the response data for the IP address request signal is not received when the timeout condition is satisfied. In this case, the protocol controller 204 recognizes that the computer terminal connected to the LAN interface unit 201 is normally connected, and operates the IP address management module 203 normally.

In addition, the protocol control unit 204 may transmit a predetermined IP address request signal to the wide area network (WAN) interface unit 202. The IP address request signal is a request signal for allocating an IP address from a predetermined Internet service provider system, and the Internet service provider system receiving the IP address request signal sends a predetermined public IP address to the present invention in response thereto. Send to the IP sharer.

The protocol controller 204 described above may be implemented in the form of a state machine included in separate hardware or predetermined firmware in the IP router according to the present invention.

3 is a flowchart illustrating a method of operating an IP router according to the present invention.

In step 301, the IP address management module according to the present invention has its initial state set to Disabled. The IP address management module according to an embodiment of the present invention is a dynamic host configuration protocol (DHCP) server, and when receiving an IP address request signal from a predetermined communication terminal connected to a LAN interface of the IP router, the predetermined IP Provide an address to the communication terminal. The IP address is an IP address that can be effectively used by a communication terminal connected to the IP router and the LAN interface unit, and may be a private IP address (eg, 192.168.x.x).

Next, in step 302, the protocol controller detects a connection connection through a predetermined port of the LAN interface unit.

The LAN interface unit includes one or more ports, each of which is assigned a uniquely identifiable identifier. For example, the port may be assigned a port number, and the IP address transmitted through the port from the private IP address management module may include the port number. The port number corresponds one-to-one with the private IP address and is used to distinguish data packets transmitted and received through one broadband network interface unit of the IP router. The IP router according to the present invention is configured to include a protocol control unit, and the protocol control unit detects this when a predetermined cable is connected to the port, that is, when a predetermined communication terminal is connected to the LAN interface unit, and a port number thereof. Record it. In a conventional IP router, when a predetermined communication terminal is connected to the port and receives an IP address request signal from the communication terminal, the IP address management module immediately transmits a predetermined IP address to the communication terminal. However, in the IP router according to the present invention, the initial setting of the IP address management module is set to Disable. Therefore, the IP address management module according to the present invention is connected to the communication terminal and does not transmit an IP address as response data even when an IP address request signal is received from the communication terminal.

Next, in step 303, the IP address management module according to the present invention transmits a predetermined IP address request signal to the communication terminal when receiving the IP address request signal from the communication terminal. At this time, the protocol control unit starts a predetermined timer means at the time when the IP address management module transmits a predetermined IP address request signal to the communication terminal (step 304).

Next, in step 305, the protocol control section judges whether predetermined response data has been received from the communication terminal while the timer means is running. The response data is a predetermined IP address, and the reception of the IP address from the communication terminal means that there is an Internet service provider system having a predetermined IP address management module among communication terminals connected to the LAN interface unit. This means that the cable to be connected to the broadband network interface of the IP router is connected to the LAN interface. Accordingly, the protocol controller according to the present invention determines whether or not to receive an IP address, which is response data received from the communication terminal.

When the IP address as the response data is received from the predetermined communication terminal in a state where the timeout set in the timer means has not elapsed, the protocol control unit maintains Disable, which is an initial state of the IP address management module. (Step 306). Through this, the IP address management module does not transmit any IP address to the LAN interface unit.

Further, when the timer means has timed out by satisfying a predetermined timeout condition (step 307), the protocol controller according to the present invention has not received response data from the communication terminal, so that one connected to the LAN interface means. The above communication terminal may be determined not to be an Internet service provider system (ISP). Therefore, no IP address is generated from the communication terminal, and it can be determined that the LAN interface unit or the broadband interface unit according to the present invention is properly connected.

Next, in step 308, the protocol controller enables the IP address management module. Since the LAN interface unit or the broadband interface unit is correctly connected without being interchanged with each other, the IP address management module operates to assign a private IP address to a communication terminal connected to the LAN interface unit. From this point on, the IP address management module operates normally. An IP address management module according to an embodiment of the present invention is a dynamic host configuration protocol server, and provides a private IP address to a predetermined communication terminal connected to the LAN interface unit.

Further, in the timeout condition of the timer means according to the present invention, when the operation time interval of the timer means is set relatively short or when the response data arrives after the timeout depending on the state of the communication channel of the LAN. The protocol controller recognizes the response data as a predetermined interrupt signal and immediately disables the IP address management module which has been switched to the enabled state to stop a series of operations associated with providing the IP address to the LAN interface means.

The method of operating an IP router according to the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. The medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a data structure, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention.

While specific embodiments of the present invention have been described so far, various modifications are possible without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by the equivalents of the claims.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible.

Accordingly, the spirit of the present invention should be understood only by the claims set forth below, and all equivalent or equivalent modifications thereof will belong to the scope of the present invention.

According to the present invention, when the main network is connected to the LAN interface unit of the IP router, the IP router stops providing the private IP address, thereby preventing the communication failure of the communication network caused by the incorrect connection of the IP router. You can get it.

Claims (7)

In the IP router, A wide area network (WAN) interface for connecting to a predetermined Internet service provider system; A LAN (LAN) interface unit including one or more ports for connection with one or more communication terminals; An IP address management module for providing a predetermined IP address to the one or more communication terminals when receiving an IP address request signal from the communication terminal; And Detects a connection to a predetermined port of the LAN interface unit, transmits an IP address request signal through the port, and determines whether to receive response data for the IP address request signal from a predetermined system connected to the port; Protocol control unit for controlling the operation of the IP address management module Including, The protocol controller performs initial operation of the IP address management module. Set to Disable and enable the operation of the IP address management module when the response data for the IP address request signal is not received. The method of claim 1, Wherein the IP address management module is a dynamic host configuration protocol server. The method of claim 1, And the protocol controller maintains the IP address management module as disabled when receiving the response data in response to the IP address request signal. The method of claim 1, The protocol controller further includes a predetermined timer means, And the protocol controller operates the timer means after transmitting the IP address request signal, and determines that the response data is not received when a predetermined timeout condition is satisfied. In the operation method of the IP router, Maintaining a LAN (LAN) interface comprising a wide area network (WAN) interface for connection with a given Internet service provider system and one or more ports for connection with one or more communication terminals; Setting an operation of an IP address management module to Disable, wherein the IP address management module provides a predetermined IP address to the one or more communication terminals when receiving an IP address request signal from the communication terminal; Detecting a connection to a predetermined port of the LAN interface unit; Transmitting an IP address request signal through the port; Determining whether response data for the IP address request signal has been received from a system connected to the port; And Enabling the operation of the IP address management module when the response data for the IP address request signal is not received. Including, Enabling the operation of the IP address management module includes: maintaining the IP address management module as disabled when receiving the response data for the IP address request signal. Operation method of the IP router, characterized in that. The method of claim 5, The IP address management module is a method of operating an IP router, characterized in that the Dynamic Host Configuration Protocol (Dynamic Host Configuration Protocol) server. A computer-readable recording medium having recorded thereon a program for executing the method of claim 5 or 6.

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