KR20100084749A - Ip address searching device and method - Google Patents

Abstract

PURPOSE: An IP address searching device and a method thereof are provided to remotely find a changed fixed IP address of an access point. CONSTITUTION: A subscriber matching unit(25) matches an IP of an access point extracted from an IP extracting unit with port number/Internet connection number saved in database of a subscriber information extracting unit. A synchronizing unit(26) compares the IP of the access point matched in the subscriber matching unit with an IP of an access point saved in an IP managing system. When the IPs are different, the synchronizing unit updates the IP as an IP of the access point matched in the subscriber matching unit.

Description

IP address search device and method {IP ADDRESS SEARCHING DEVICE AND METHOD}

The present invention relates to an IP (Internet Protocol) address retrieval apparatus and method, and more particularly, when a fixed IP of an access point (AP) for use of a wireless LAN is arbitrarily changed, the changed fixed IP is searched for to an IP management system. The present invention relates to an IP address retrieval apparatus and method for enabling the IP of a stored access point.

Currently, in the case of commercial WLAN service, for example, Nespot ^® service, which is being serviced by the applicant, has installed an access point (AP) in each subscriber's home to enable Internet access between the access point and a computer equipped with a WLAN card. .

In order to provide Internet services, each device connected to the Internet including a wireless LAN card, an access point, and a router must include an IP address. This IP address serves as a kind of address that allows data to be correctly transmitted from the source terminal to the destination terminal to which the data is to be transmitted. These IP addresses include a dynamic IP that is dynamically allocated every time a connection is made and a fixed IP whose value is fixed to a predetermined value.

Currently, the commercial wireless LAN service provides fixed IP for convenient and efficient management.

On the other hand, there is a case where an access point sometimes fails and the access point needs to be replaced. In this case, when changing or changing the access point, the fixed IP address of the access point for the subscriber may be changed, and when such a change occurs, the IP for managing and storing the fixed IP of each device of the wireless network. It is necessary to register the changed IP address in the management system. However, if the changed IP address is not registered in the IP management system and needs to be remotely connected to an access point or the like, the connection may fail.

In order to solve this problem, conventionally, the service personnel went directly to the site to check the changed IP address of the access point and informed the IP management system administrator of the present procedure.

As described above, when the fixed IP address assigned to the access point is changed, in order to remotely access the access point, the service personnel have to check the changed fixed IP address and register a new change in the IP management system. Thus, much time and labor was consumed in this regard.

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to provide an IP address retrieval apparatus and a method for retrieving a changed fixed IP address of an access point remotely from an IP management system without a service worker. Is in.

According to an aspect of the present invention, there is provided an IP address retrieval apparatus capable of remotely inspecting an IP of a subscriber station by accessing an IP management system through the Internet in a wireless LAN service wirelessly accessible through an access point. The IP address retrieval apparatus is managed by the IP management system, and the subscriber information extraction unit for databaseting the subscriber information of the wireless LAN service subscriber including the Internet access number, and the device information of the aggregation device and router including the port number. ; A first IP collector configured to collect the port number of the concentrator and the MAC information of the subscriber station on the concentrator, to database the port and the MAC information, and to database the MAC and IP information uploaded to the router; An IP extraction unit configured to extract the IP of the access point by matching the databased information with each other; A subscriber matching unit matching the IP of the access point extracted by the IP extraction unit with a port number / internet access number stored in a database of the subscriber information extraction unit; And a current unit for comparing the IP of the access point matched by the subscriber matching unit with the IP of the access point stored in the IP management system and updating the IP of the access point matched by the subscriber matching unit if different. It includes.

According to another aspect of the present invention, there is provided an IP address retrieval apparatus capable of remotely inspecting an IP of a subscriber station by accessing an IP management system through the Internet in a wireless LAN service wirelessly accessible through an access point. The IP address retrieval apparatus includes a subscriber information extraction unit managed by the IP management system and configured to database subscriber information of a wireless LAN service subscriber including an Internet access number and device information of a DSLAM and a NAS including a port number; A second IP collector configured to database the port number of the DSLAM and the VPI / VCI information set in the port number, and to database the IP set in the VPI / VCI of the NAS; An IP extraction unit configured to extract the IP of the access point by matching the databased information with each other; A subscriber matching unit matching the IP of the access point extracted by the IP extraction unit with a port number / internet access number stored in a database of the subscriber information extraction unit; And comparing the IP of the access point matched by the subscriber matching unit with the IP of the access point stored in the IP management system and updating the IP of the access point matched by the subscriber matching unit if different. Includes a fire department.

According to still another aspect of the present invention, there is provided an IP address retrieval method capable of remotely inspecting an IP address of a subscriber station by accessing an IP management system through the Internet in a wireless LAN service wirelessly accessible through an access point. The IP address retrieval method includes: retrieving a port number of a subscriber's aggregation device from the IP management system; Retrieving information of the concentrating device and the router; Collecting and extracting MAC information on the port corresponding to the port number by telnet accessing the concentrator; Accessing the router to retrieve ARP table information and extracting IP information matched with the MAC information uploaded to the port; Matching the port number / the IP information from the port number / the MAC information and the MAC information / the IP information; And comparing the IP of the access point stored in the IP management system with the matched port number / IP information.

According to another aspect of the present invention, there is provided an IP address retrieval method capable of remotely inspecting an IP of a subscriber station by accessing an IP management system through the Internet in a wireless LAN service that can be wirelessly connected to the Internet through an access point. And the IP address retrieval method comprises: retrieving a port number in the DSLAM of the subscriber from the IP management system; Retrieving information of the DSLAM and NAS; Telnet accessing the DSLAM to collect and extract VPI-VCI information for the port corresponding to the port number and extract the VPI-VCI value of the converted NAS; Accessing the NAS and extracting IP information set in VPI-VCI information; Matching the port number / the IP information from the port number / the VPI-VCI information and the MAC VPI-VCI information / the IP information; And comparing the IP of the access point stored in the IP management system with the matched port number / IP information.

As described above, according to the IP address retrieval apparatus and method according to the present invention, when the fixed IP address of the access point is changed, the service personnel can find out the changed IP address without having to go to the field and remotely access the access point. By doing so, time and labor consumption can be minimized.

Hereinafter, the same reference numerals will be described in detail with reference to the accompanying drawings, with reference to the same components preferred embodiments of the present invention. The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and should be construed in accordance with the technical meanings and concepts of the present invention.

The embodiments described in the specification and the configuration shown in the drawings are preferred embodiments of the present invention, and do not represent all of the technical idea of the present invention, various equivalents and modifications that can be substituted for them at the time of the present application are There may be.

1 is a diagram illustrating a network in which an IP address search apparatus 20 according to an embodiment of the present invention is connected to a network for providing a WLAN service, and FIG. 2 is an IP address search apparatus according to an embodiment of the present invention. A block diagram of 20 is shown.

Referring to FIG. 1, the present network includes the Internet (1), a service provider management network (2), a gigabit router (GSR: 3), a large switch (4), a NAS (Network Access Server: 5), and a DSLAM (Digital Subscriber). Line Access Multiplexer (6), router (7), concentrator (8), access point (9), IP management system (10), and IP address retrieval device (20) are connected to each other and are not shown here. Authentication server and billing server may be included.

In more detail with respect to the above-described network configuration, data is transmitted and received through the wireless LAN 11 that communicates with the access point 9, and such data is transmitted to the DSLAM 6 and the NAS 5 based on an Asynchronous Transfer Mode (ATM). ) Through a large switch (4) that focuses both on IP-based concentrators (8) and routers (7), and through a gigabit router (3) that is a backbone router. I can do it.

At this time, the IP management system 10 performs management of storing, assigning, etc., fixed IPs of the respective devices.

2, the IP address retrieval apparatus 20 according to an embodiment of the present invention is a subscriber information extraction unit 24, IP-based IP collection unit 21, ATM-based IP collection unit 22, IP extraction Section 23, subscriber matching section 25, and currentization section 26.

The subscriber information extracting unit 24 makes a database of predetermined information of a commercial WLAN service subscriber managed by the IP management system 10, for example, a subscriber name / internet access number / device name / port number, and collects the data in the IP sequence. (8) and the predetermined information of the devices of the DSLAM 6 and the NAS 5 in the router 7 and the ATM series, for example, the device name / manufacturer / device IP / device ID / device password and the like.

For example, in the database of the predetermined information on the subscriber, in the case of the IP series, the database may be in the form of "Hong Gil Dong / 1004-2002 / A1004003 / 0001", in which case the subscriber name is "Hong Gil Dong" and the Internet access number is " 1004-2002 ", and the concentrator 8 name is" A1004003 "and the port number to which the subscriber is connected is" 0001 ".

In the case of the ATM series, for example, the database may be in the form of "Kim Chul-soo / 224-1234 / GJ01-003001-01-02-03", in which case the subscriber name is "Kim Chul-soo" and the Internet access number is "224-1234" and the DSLAM The device name in (6) is "GJ01" and the manufacturer is "003001 (eg Samsung Electronics' manufacturer's number)" and it means 01 rack, 02 self and 03 port.

In the database of predetermined information on the device, in the case of the IP series, for example, in the case of the concentrator 8, the device name / manufacturer / device IP / device ID / device password is " A1004003 / Dasan / 61.123.44.55. / test / test123 ", and for router (7), configure device name / device IP / device ID / device password / fixed IP band as“ V5604 / 61.123.44.56 / test / test123 / 61.123.44.2 ~ 50 ” can do.

In the case of the ATM series, for example, in the case of the DSLAM 6, the device name / manufacturer / device IP / device ID / device password can be configured as “GJ01 / Samsung / 50.123.44.33 / test / test123” and the NAS ( In case of 5), DSLAM name / NAS name / IP of NAS / Port of NAS / ID of NAS / password of NAS can be configured as “GJ01 / RedBack / 50.123.44.50 / 01,01 / test / test123”.

The IP-based IP collection unit 21 collects the MAC information of the port of the concentrator 8 and the subscriber terminal uploaded to the concentrator 8, database the port and MAC information, and uploads the MAC information and the IP information uploaded to the router. Database.

More specifically, the IP-based IP collecting unit 21 extracts the information of the concentrating device 8 of the subscriber information extracting unit 24, telnet accesses, and stores the port / MAC information in the ARP table of the concentrating device 8 in the database. Make up.

For example, the concentrator 8 / concentrator model / device IP / ID / Passwd is telnet to the concentrator 8 with "A1004003 / Dasan / 61.123.44.55 / test / test123" and the concentrator 8 as shown in Table 1 below. You can database port / MAC information in ARP table of.

Concentrator Name-Port MAC A1004003-001 00: c0: 26: 7c: 50: b1 A1004003-001 03: c0: 21: 7c: 51: b2 A1004003-008 02: c0: 20: 7c: 52: b3 A1004003-009 04: c0: 23: 7c: 53: b4

Referring to Table 1, it can be seen that two MACs are mounted on the same port “001”. This may be the case, for example, when a MAC from a personal computer (PC) and a MAC from an access point (AP) exist simultaneously.

In addition, the IP-based IP collection unit 21 collects IP information matching the MAC information of the subscriber station on the router 7 and makes a database of the MAC information and the IP information.

More specifically, the information of the router 7 of the subscriber information extracting unit 24 is extracted, telnet-connected, and the MAC / IP information is databased in the ARP table of the corresponding router 7.

For example, Router Model / Router IP / ID / Passwd / Fixed IP Band are “V5604 / 61.123.44.56 / test / test123 / 61.123.44.2 ~ 50” and “V5604 / 61.123.45.23 / test / test123 / 61.123.45.2 ~ 20 By telnet accessing the router 7, the MAC / IP information may be databased in the ARP table of the router 7, as shown in Table 2 below.

MAC IP from subscriber terminal 00: c0: 26: 7c: 50: b1 61.123.44.5 03: c0: 21: 7c: 51: b2 61.123.45.20 02: c0: 20: 7c: 52: c1 61.123.12.22 04: c0: 23: 7c: 53: d2 61.123.12.33

The ATM-based IP collecting unit 22 databases a port of the DSLAM 6 and virtual path identifier (VPI) / virtual channel identifier (VCI) information set in the port.

More specifically, in relation to the database of ports / VPIs and VCIs, the ATM-based IP collecting unit 22 extracts information of the DSLAM 6 of the subscriber information extracting unit 24, telnet-connects the corresponding DSLAM 6 ), The VPI / VCI information is databased, and the VPI and VCI of the NAS converted by the corresponding DSLAM (6).

For example, if the DSLAM name / manufacturer / DSLAM's IP / ID / Password is “GJ01 / Samsung / 50.123.44.33 / test / test123” and “GJ02 / Samsung / 60.123.23.11 / test / test123”, then the DSLAM (6) Databaseized examples of VPI / VCI information and examples of databaseized VPI / VCI information converted by the corresponding DSLAM 6 are shown in Tables 3 and 4, respectively.

DSLAM Port VPI VCI GJ01-003001-01-01-01 321 234 GJ01-003001-01-01-02 321 235 GJ02-003001-01-01-01 121 134

DSLAM Port VPI, VCI Converted NAS VPI, VCI GJ01-003001-01-01-01 321,234 234,123 GJ01-003001-01-01-02 321,235 345,123 GJ02-003001-01-01-01 121,134 343,234

In addition, the ATM-based IP collection unit 22 databases the fixed IP set in the VPI and VCI of the NAS 5. For example, the ATM-based IP collection unit 22 may be a database as shown in Table 5 below.

DSLAM Port NAS name NAS IP NAS port VPI VCI Fixed IP
GJ01-003001-01-01-01 Redback 50.123.44.50 01, 01 234 123 61.23.33.44 GJ01-003001-01-01-02 Redback 50.123.44.50 01, 01 345 123 61.23.23.23 GJ02-003001-01-01-01 Redback 50.123.44.50 01, 01 345 112 61.23.33.43

The IP extractor 23 extracts the IP of the access point by matching the database information with each other, searches whether the extracted IP is a fixed IP band from the database of the subscriber information extractor 24, and telnets the extracted fixed IP. Connect and check if it is the IP of the access point.

More specifically, first, when the IP of the IP-based access point is to be extracted, the IP of the access point is extracted from information databased by the IP-based IP collection unit 21.

For example, the port / MAC information collected by the concentrator 8 and the MAC / IP information collected by the router are "A1004003-001 / 00: c0: 26: 7c: 50: b1" and "00: c0: 26:", respectively. 7c: 50: b1 / 61.123.44.5 ", the IP per port would be" A1004003-001 / 61.123.44.5 "and" A1004003-001 / 03: c0: 21: 7c: 51: b2 "and" 03: c0: 21: 7c: 51: b2 / 61.123.44.20 "results in" A1004003-001 / 61.123.45.20 ".

Next, it is searched whether the extracted IP is a fixed IP band in the database of the subscriber information extracting unit 24. For example, in the above example, "A1004003-001 / 61.123.44.5" belongs to the fixed IP band "61.123.44.2-50" and thus extracts "A1004003-001 / 61.123.44.5" as the fixed IP. And "A1004003-001 / 61.123.45.20" does not belong to the fixed IP band "61.123.44.2 ~ 50" and therefore "A1004003-001 / 61.123.45.20" is not determined as a fixed IP.

Finally, the IP extracting unit 23 checks whether the IP of the access point is connected by telnet to the extracted fixed IP.

For example, in the above example, if the model name of the access point is extracted by connecting to "A1004003-001 / 61.123.44.5", the IP data of the access point may be "A1004003-001 / 61.123.44.5 / AP3100".

Next, to extract the IP of the access point of the ATM series, the IP of the access point is extracted from the information databased by the ATM series IP collection unit 22, and telnet access is made to the extracted IP.

For example, telnet access is made to the IP matching the VPI / VCI of the NAS 5 to check whether it is the IP of the access point. If the information in the database is "RedBack / 50.123.44.50 / 01,01 / 234/123 / 61.23.33.44", check the IP of the access point by accessing the IP "61.23.33.44". Extract. In this case, the model name of the access point may be "AP3100" as can be seen in "RedBack / 50.123.44.50 / 01,01 / 234/123 / 61.23.33.44 / AP3100".

The subscriber matching unit 25 matches the IP of the access point extracted by the IP extraction unit 23 with the port / internet access number of the subscriber information extraction unit 24 to finally match the IP of the subscriber's access point.

For example, in the case of the IP series, if the data from the subscriber information extraction unit 24 is " Hong Gil Dong / 1004-2002 / A1004003 / 0001 " and the data of the access point extracted from the IP extraction unit 23 is " A1004003-001 / " 61.123.44.5/AP3100, the final data will be "Hong Gil-dong / 1004-2002 / A1004003 / 0001 / 61.123.44.5 / AP3100" and therefore if the subscriber is "Hong Gil-dong" the Internet access number is "1004-2002" It can be seen that the IP of the access point is "61.123.44.5" and the model name of the access point is "AP3100".

In the case of the ATM series, if the data from the subscriber information extracting unit 24 is "Kim Chul-soo / 224-1234 / GJ01-003-01-02-03", the data of the ATM series IP extracting unit 22 is "GJ01-003001". -01-01-01 / RedBack / 50.123.44.50 / 01,01 / 234/123 / 61.23.33.44 "and the data of the access point is" RedBack / 50.123.44.50 / 01,01 / 234/123 / 61.23.33.44 / AP3100 ", the final data is" Kim Chul-Soo / 224-1234 / GJ01-003001-01-02-03 / 61.23.33.44 / AP3100 "and therefore, if the subscriber is" Kim Chul-Soo ", the Internet access number is" 224-1234 ". The IP of the access point is " 61.23.33.44 " and the model name is " AP3100 ".

The currentization unit 26 compares the IP of the access point finally matched by the subscriber matching unit 25 with the IP of the corresponding access point stored in the IP management system 10 and compares the IP with the corresponding access point. Is not stored in the IP management system 10 or is incorrect, it is determined as an error and updated with the IP of the finally matched access point.

Hereinafter, an example of extracting an IP of an access point for each subscriber according to an embodiment of the present invention will be described with reference to FIGS. 3 and 4.

3 is a flowchart illustrating a method of searching for an IP address of an access point in an IP sequence according to an embodiment of the present invention, and FIG. 4 illustrates an IP address of an access point in an ATM sequence according to an embodiment of the present invention. This is a flowchart showing how to search.

First, an example of extracting an IP of an access point for each subscriber from an IP sequence will be described with reference to FIG. 3.

First, the subscriber information extraction unit 24 retrieves the port number in the aggregation device 8 of the subscriber from the IP management system 10 (S001). For example, the port number " 0023 " is retrieved from the information of " Lee Young Hee / 1004-2345 / A004001 / 0023 " in a database composed of " subscriber name / internet access number / aggregator name / port ".

Next, the subscriber information extracting unit 24 searches for information on the concentrating device 8 (S003) and retrieves information on the router 7 which is a higher level device (S005). For example, "A004001 / Dasan / 61.123.44.55 / test / test123" as "device name / manufacturer / device IP / device ID / device Passwd" for the concentrator 8, and "device name / device IP for the router 7". "V5604 / 61.123.44.56 / test / test123 / 61.123.44.2-15" can be obtained as / device ID / device Passwd / fixed IP band ".

Thereafter, the IP-based IP collector 21 collects and extracts MAC information uploaded to the corresponding port by telnet to the concentrator 8 (S007). For example, "A004001-023 / 00: 03: 26: 7c: 50: b1", "A004001-023 / 00: c0: 24: 7b: 50: c2" as "device name-port number / MAC", and "A004001" -023 / 00: c0: 23: 7c: 50: c1 ".

Next, the IP series IP collection unit 21 accesses the router 7 and retrieves the ARP table information to extract the IP matching the MAC on the port (S009). For example, "MAC / IP" that matches each other is "00: 03: 26: 7c: 50: b1 / 61.123.44.20", "00: c0: 24: 7b: 50: c2 / 61.123.44.3", and "00 : c0: 23: 7c: 50: c1 / 61.123.44.21 ".

The IP extraction unit 23 extracts the IP of the fixed IP band among the IPs matching the MAC (S009) (for example, "00: c0: 24: 7b: 50: c2 / 61.123.44.3" in the above example). The model of the access point is extracted by telnet accessing the extracted static IP (S011). For example, the "fixed IP / access point model" may be "61.123.44.3/AP3100".

Thereafter, the subscriber matching unit 25 matches the access number / port / fixed IP of the subscriber (S013). For example, "subscriber name / access number / access point IP / model of access point" may be "Lee Young-hee / 1004-2345 / 61.123.44.3 / AP3100".

Finally, the IP of the extracted access point and the IP of the access point of the IP management system 10 are compared and corrected, that is, current (S015).

Next, an example of extracting the IP of the subscriber-specific access point in the ATM series will be described with reference to FIG.

First, the subscriber information extraction unit 24 retrieves the port number in the DSLAM 6 of the subscriber from the IP management system 10 (S002). For example, the port number " 03 " is retrieved from the information of " non-agent / 234-4567 / GJ01-003001-01-02-03 " in a database composed of " subscriber name / internet access number / DSLAM information ".

Next, the subscriber information extraction unit 24 retrieves the information on the DSLAM 6 (S004) and retrieves the information of the NAS (5) that is the upper device (S006). For example, "GJ01 / Samsung / 50.123.44.33 / test / test123" as "device name / manufacturer / device IP / device ID / device password" for DSLAM 6 and "DSLAM name / NAS model" for NAS 5 "GJ01 / RedBack / 50.123.44.50 / 01,01 / test / test123" can be obtained as / NAS_IP / NAS_Port / ID / Password ".

Afterwards, the ATM-based IP collection unit 22 accesses the DSLAM 6 by telnet, collects VPI / VCI information on the corresponding port, and extracts the VPI / VCI value of the converted NAS 5 (S008). For example, "GJ01-003001-01-01-01 / 321,234 / 234,123" can be obtained as "VPI of DSLAM port / DSLAM, VPI of VCI / NAS, VCI".

Next, the ATM series IP collecting unit 22 connects to the NAS 5 and extracts the fixed IP set in the VPI / VCI (S010). For example, "NAS VPI, VCI / Static IP" may be "234,123 / 50.123.44.20".

The IP extraction unit 23 connects to the extracted fixed IP by telnet and extracts a model of the access point (S012). For example, the "fixed IP / access point model" may be "50.123.44.20/AP3100".

Thereafter, the subscriber matching unit 25 matches the access number / port / fixed IP of the subscriber (S014). For example, "subscriber name / access number / access point IP / model of access point" may be "unattended / 234-4567 / 50.123.44.20 / AP3100".

Finally, the IP of the extracted access point and the IP of the access point of the IP management system 10 are compared and corrected, that is, current (S016).

The technical spirit of the present invention has been described above with reference to the accompanying drawings, but this is only illustrative of the preferred embodiments of the present invention and is not intended to limit the present invention. In addition, it is a matter of course that various modifications and variations are possible without departing from the scope of the technical idea of the present invention by anyone having ordinary skill in the art.

1 is a network configuration diagram in which an IP address retrieval apparatus according to an embodiment of the present invention is connected to a network for providing a WLAN service;

2 is a block diagram of an IP address searching apparatus according to an embodiment of the present invention;

3 is a flowchart illustrating a method of searching for an IP address of an access point in an IP sequence according to an embodiment of the present invention; and

4 is a flowchart illustrating a method for retrieving an IP address of an access point in an ATM series according to an embodiment of the present invention.

Claims (4)

An IP address retrieval apparatus capable of remotely inspecting an IP of a subscriber station by accessing an IP management system through the Internet in a wireless LAN service that can be wirelessly connected to the Internet through an access point. A subscriber information extraction unit managed by the IP management system and configured to database subscriber information of a wireless LAN service subscriber including an Internet access number and device information of a concentrating device and a router including a port number; A first IP collector configured to collect the port number of the concentrator and the MAC information of the subscriber terminal on the concentrator, to database the port and the MAC information, and to database the MAC and IP information uploaded to the router; An IP extraction unit configured to extract the IP of the access point by matching the databased information with each other; A subscriber matching unit matching the IP of the access point extracted by the IP extraction unit with a port number / internet access number stored in a database of the subscriber information extraction unit; And The currentization unit for comparing the IP of the access point matched by the subscriber matching unit with the IP of the access point stored in the IP management system and updating the IP of the access point matched by the subscriber matching unit if different. IP address retrieval apparatus comprising a. An IP address retrieval apparatus capable of remotely inspecting an IP of a subscriber station by accessing an IP management system through the Internet in a wireless LAN service that can be wirelessly connected to the Internet through an access point. A subscriber information extraction unit managed by the IP management system and configured to database subscriber information of a wireless LAN service subscriber including an Internet access number, and device information of a DSLAM and a NAS including a port number; A second IP collector configured to database the port number of the DSLAM and the VPI / VCI information set in the port number, and to database the IP set in the VPI / VCI of the NAS; An IP extraction unit configured to extract the IP of the access point by matching the databased information with each other; A subscriber matching unit matching the IP of the access point extracted by the IP extraction unit with a port number / internet access number stored in a database of the subscriber information extraction unit; And The currentization unit for comparing the IP of the access point matched by the subscriber matching unit with the IP of the access point stored in the IP management system and updating the IP of the access point matched by the subscriber matching unit if different. IP address retrieval apparatus comprising a. In a wireless LAN service that can be connected to the Internet wirelessly through an access point, an IP address retrieval method capable of remotely inspecting the subscriber station's IP by accessing an IP management system through the Internet, Retrieving a port number of the subscriber's aggregation device from the IP management system; Retrieving information of the concentrating device and the router; Collecting and extracting MAC information on the port corresponding to the port number by telnet accessing the concentrator; Accessing the router to retrieve ARP table information and extracting IP information matched with the MAC information uploaded to the port; Matching the port number / the IP information from the port number / the MAC information and the MAC information / the IP information; And And comparing the IP of the access point stored in the IP management system with the matched port number / IP information. In a wireless LAN service that can be connected to the Internet wirelessly through an access point, an IP address retrieval method for remotely inspecting the IP of a subscriber terminal connected to an IP management system via the Internet, Retrieving the port number in the DSLAM of the subscriber from the IP management system; Retrieving information of the DSLAM and NAS; Telnet accessing the DSLAM to collect and extract VPI-VCI information for the port corresponding to the port number and extract the VPI-VCI value of the converted NAS; Accessing the NAS and extracting IP information set in VPI-VCI information; Matching the port number / the IP information from the port number / the VPI-VCI information and the MAC VPI-VCI information / the IP information; And And comparing the IP of the access point stored in the IP management system with the matched port number / IP information.

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