KR100668654B1 - Apparatus for dhcp sever of portable internet system and method for providing the service and packet access router having the apparatus - Google Patents

Abstract

The present invention relates to a DHCP server device of a portable Internet system, a service providing method thereof, and a packet access router including the device. In particular, the DHCP server device performs verification of authority of a mobile terminal with respect to a DHCP address request received from the mobile terminal. Allocate the address after execution. After allocating or releasing an address for the mobile station, the mobile station user's domain name and DNS information for the newly allocated address are updated. As described above, for the mobile terminal using the DHCP service in the mobile Internet system capable of providing both DHCP and MIP services, the authentication of the authority of the DHCP address request message of the mobile terminal is performed in the DHCP server device operating in the PAR of the mobile Internet system. By performing the assignment of the address for the mobile terminal after the execution, it is possible to prevent the allocation of address resources to unauthorized users, i.e., illegal users.

Mobile Internet, Terminal, DHCP, Authorization, Resource Allocation, Resource Release, PAR

Description

DCP server device of portable internet system and service providing method thereof, and packet connection router including the device TECHNICAL TECHNICAL FIELD

1 is a view showing the structure of a portable Internet system according to an embodiment of the present invention.

2 is a diagram showing the configuration of a DHCP server device of a portable Internet system according to an embodiment of the present invention.

3 is a diagram illustrating a DHCP address allocation process of a mobile terminal in a portable internet system according to an exemplary embodiment of the present invention.

4 is a diagram illustrating a DHCP address release process of a mobile terminal in a portable Internet system according to an embodiment of the present invention.

5 is a diagram illustrating a DHCP address release process of a mobile terminal by an AP in a portable Internet system according to an embodiment of the present invention.

6 is a diagram illustrating a DHCP address release process of a mobile terminal by a PAR in a portable Internet system according to an embodiment of the present invention.

7A to 7E are diagrams illustrating a message processing process in a DHCP server device of a portable Internet system according to an embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable Internet system, and more particularly, to a user of a mobile terminal that wants to access the Internet for efficient use of an IP address, a dynamic IP configuration (DHCP) service function and a mobile IP (IP) for a user who can move between IP subnets. The present invention relates to a DHCP server device for preventing resource allocation to an illegal terminal user in a portable Internet system capable of providing both service functions, and a service providing method thereof.

Recently, the domestic high-speed Internet service and mobile communication service market is gradually entering a saturation state, and the global mobile communication market is continuing to slump due to delayed commercialization of 3G mobile service. In this stagnant telecommunications market environment, wireless Internet services that provide high-speed Internet access to mobile subscribers at low rates are considered a breakthrough in creating new markets.

In general, the wireless Internet technology may be classified into commercial wireless LAN, cellular based mobile communication such as cdma 2000 1xEV-DO, and portable Internet to be commercialized in the future.

Wireless LAN is capable of Internet service at high transmission speed but limited in mobility and service area. Cellular-based mobile communication supports broadband service area and high speed mobility but is limited in transmission speed and usage fee. Therefore, existing wireless LAN and cellular-based mobile communication systems cannot provide high-speed data services to mobile subscribers at low rates.

On the other hand, the mobile Internet is located in the middle of the wireless LAN and the mobile communication-based wireless Internet, and is a service that combines the advantages of both services. Various wireless data services including video and high speed packet data may be provided. As such, the portable Internet is in the spotlight as a next generation communication method because it supports a wide range of service areas, high transmission speeds, and mobility. Currently, various standards have been proposed for the portable Internet, and international standardization of the portable internet is currently underway based on IEEE 802.16.

The wireless packet data system must have an IP address for identifying the mobile terminal in order to receive the packet call service through the packet network. Preferably, all mobile terminals must have unique IP addresses, but since the number of available IP addresses is limited, a method of temporarily allocating an IP address only when the mobile terminal uses a service is mainly used.

In general, in a wireless network providing a DHCP service, a DHCP server allocates a dynamic IP address of a mobile station, and in a wireless network providing a MIP service, a HA (home agent) allocates a dynamic IP address of a mobile station.

DHCP, on the other hand, is a protocol that allows network administrators to centrally manage and assign IP addresses on a network within an organization. When a network administrator centrally manages and assigns IP addresses, and when computers are connected to other places on the network, It will automatically send you a new IP address. In addition, MIP is a protocol for the continuous use of IP addresses of mobile users. The MIP detects the movement of the mobile terminal and enables the network to communicate in the same manner as before the mobile network. You can use the Internet with your existing IP address outside of your home network.

When the prior art is applied to a portable Internet system capable of providing both DHCP and MIP services, the MIP service user is always assigned an address only to the authenticated user because the HA assigns an address during the MIP registration procedure of the mobile station. . Thus, no waste of address resources for illegal users occurs. However, since the mobile station requests a dynamic address assignment directly to the DHCP server for the DHCP service user, the DHCP server does not know whether the mobile terminal has been authenticated unless it is linked with the AAA server. Therefore, a problem arises in that dynamic addresses can only be allocated to illegal users through hacking.

As a related art, Korean Patent Laid-Open Publication No. 2003-22534 discloses a system and a method for preventing unauthorized access to the Internet and a network using DHCP. This technique configures a DHCP protecting server between the authentication DB and the DHCP server so that the DHCP server does not directly assign addresses to DHCP clients. After receiving the message from the DHCP client, the DHCP server sends this message to the DHCP protecting server and compares the hardware address of the authentication DB with the hardware address of the DHCP message to prohibit address assignment to unauthenticated DHCP clients. However, this technique has the effect of preventing internet access for unauthorized users, but there is a problem that an entity called a DHCP protecting server must be added.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a DHCP server device of a portable Internet system and a service providing method thereof, which can prevent address resource allocation to an illegal user without adding an entity.

In order to solve the above problems, the DHCP server device of the portable Internet system according to an aspect of the present invention,

A DHCP server device that allocates and releases a Dynamic Host Configuration Protocol (DHCP) address of a mobile terminal in a portable Internet system.
An address resource management unit for managing address resources that can be allocated to a corresponding packet access router (PAR) area; A network interface unit providing an interface for performing DHCP address assignment / release of the mobile station; And allocating or releasing a DHCP address of the mobile station by a DHCP address allocation or releasing request of the mobile station, and responding to the DHCP address allocation request from the mobile station based on the hardware address of the mobile station. And a DHCP message processing unit for allocating an address through the address resource manager after performing authorization verification of the mobile station.

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In addition, the DHCP message processing unit performs a function of requesting an update of Domain Name Server (DNS) information of the mobile terminal according to the address assignment or release of the mobile terminal, and the DHCP server apparatus requests the DHCP message processing unit. It may further include a domain name / address mapping management unit for updating the DNS information for.

According to another aspect of the present invention, a packet access router includes

A packet access router that performs dynamic host configuration protocol (DHCP) address assignment or release in a mobile Internet system.

A session information database in which session information for a mobile terminal is stored; And when a DHCP address allocation request is received from the mobile station, performing authorization verification for the mobile station by searching the session information database based on the hardware address of the mobile station, assigning an address to the mobile station, and moving the mobile station. It includes a DHCP server unit for updating the DNS (Domain Name Server) information for the mobile terminal when address allocation or release to the terminal.

Service providing method of the DHCP server device according to another aspect of the present invention,

A service providing method of a DHCP server device for allocating and releasing a Dynamic Host Configuration Protocol (DHCP) address of a mobile terminal in a portable Internet system.
a) receiving a DHCP address assignment request message from a mobile station; b) searching for session information of the mobile terminal based on the hardware address of the mobile terminal included in the DHCP address assignment request message and performing authorization verification of the mobile terminal; And c) assigning an address to the mobile terminal whose authority verification is completed in step b).

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Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

A DHCP service providing method in a portable Internet system of a portable Internet system according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

First, the portable Internet system to which the present invention is applied will be described in detail with reference to FIG. 1.

1 is a view showing the structure of a portable Internet system according to an embodiment of the present invention.

As shown in FIG. 1, the portable Internet system 100 according to an embodiment of the present invention includes a terminal 110 (Access Terminal, hereinafter referred to as 'AT') 110, an access point (hereinafter referred to as an 'AP') ( 120, Packet Access Router (hereinafter referred to as 'PAR') 130, AAA (Authentication, Authorization and Accounting; referred to as 'AAA') Server 140, Home Agent (hereinafter referred to as 'A') HA ') 150 and DNS server 160, and provides a high-speed Internet service through a wireless connection, and has a structure that can provide both DHCP and MIP services.

The AT 110 has mobility to a portable Internet terminal and performs a wireless channel transmission / reception function according to a wireless access standard of the portable Internet system 100 at a frequency of 2.3 GHz in order to access and transmit high-speed packet data by accessing the AP 120. .

The AP 120 is a device that connects a wireless network and a wired network to control a wireless channel, and is connected to a wired network to provide a wireless packet data service directly to the AT 110. That is, the AP 120 performs initial access, intersectoral handover control, and quality of service (QoS) control between the ATs 110 and receives a radio signal from the AT 110 to the PAR 130. On the contrary, it converts various information received from the PAR 130 into a radio signal and transmits the information to the AT 110.

The PAR 130 is connected to a plurality of APs 120 by IP-based wired connection with an IP-based service provider IP network 200 constituting the public Internet network 300, and has a packet access routing function and a foreign agent of a MIP. : FA) Perform the function. In addition, the PAR 130 interworks with the AAA server 140 for HA 150 and user authentication for IP mobility, and one PAR area becomes one IP subnet. Here, the external agent function refers to a user registration and deregistration function so that a packet-based internet access and roaming service can be moved to another service network while maintaining an internet connection. In addition, the PAR 130 according to an embodiment of the present invention implements a DHCP server 132.

The DHCP server 132 performs the mobile station's authority verification for the mobile station's DHCP address assignment request and, if the authority verification succeeds, assigns an IP address of the corresponding subnet. Perform DNS registration for domain names and newly assigned IP addresses.

The AAA server 140 is connected to the PAR 130 and the operator IP network to authenticate the AT 110 and the user, verify service authority, generate an authentication key, and charge the user to provide DHCP and MIP services to the subscribers of the mobile Internet network. Perform the function. In addition, the AAA server 150 uses a diameter protocol that is being standardized by the Internet Engineer Task Force (IETF). Diameter protocol enables authentication, authorization and billing information transfer by inter-server interworking.

The HA 150 is connected to the PAR 130 through the Internet network to perform a MIP service function.

The DNS server 160 maps and manages the domain name and the IP address of the AT 110, and functions to interpret and inform the domain name or the IP address.

The portable Internet system 100 shown in FIG. 1 promoted by IEEE 802.16 may interwork with other Internet networks through the AAA server 150, and may configure one or more PARs 130 on the same network. In addition, one or more APs 120 may be configured under one PAR 130, and a plurality of ATs 110 may be connected to one AP 120 to receive a service. In addition, even when the AT 110 moves from a cell governed by the AP 120 to a new cell, the AT 110 may receive a service provided by an existing cell.

2 is a diagram showing the configuration of a DHCP server device of a portable Internet system according to an embodiment of the present invention.

As shown in FIG. 2, the PAR 130 of the portable Internet system according to the embodiment of the present invention includes a DHCP server device 132 and a session information database 134.

 The DHCP server device 132 includes a network interface unit 132-1, a DHCP message processing unit 132-2, an address resource manager 132-3, and a domain name / address mapping manager 132-4. A function of allocating / releasing an IP address resource of the AT 110 for the DHCP address allocation / releasing request message of 110 is performed. At this time, the DHCP server device 132 performs the authority verification of the AT 110 for the DHCP address allocation request message of the AT 110, and then allocates an IP address resource of the corresponding subnet when the authority verification succeeds, and the AT ( After the address allocation / release is performed at 110, DNS registration of the user's domain name and the newly allocated IP address is performed to dynamically update the DNS server 160.

The network interface unit 132-1 provides an interface for transmitting and receiving messages with the AP 120 and the DNS server 160. At this time, the interface with the AP 120 for transmitting and receiving the DHCP message of the AT (110) does not use a well known port (well know port), the dedicated interface for communication between the AP (120) -PAR (130) use.

The DHCP message processing unit 132-2 receives and interprets the dynamic address allocation / release request message for the AT 110 of the DHCP service user in cooperation with the DHCP server 170 and through the address resource management unit 132-3. It performs a function of allocating / releasing an address to the AT 110. In addition, the DHCP message processing unit 132-2 performs an authentication and searches for the session information database 134 of the PAR 130 in which the session information of the AT 110 is stored. ) Verify the authorization to verify that the certificate is authenticated. The domain name / address mapping manager 132-4 performs a function of requesting to register the domain name and IP address of the AT 110 to the DNS server 160.

The address resource management unit 132-3 manages the address resources that can be allocated to the corresponding PAR 130 area. The address resource management unit 132-3 performs the function of address resource allocation / release request from the DHCP message processing unit 132-2. It manages the available situation.

The domain name / address mapping manager 132-4 manages the connection between the domain name and the IP address of the AT 110 in association with the DNS server 160. That is, the domain name / address mapping manager 132-4 transmits the domain name and the IP address of the AT 110 acquired through the session information database 134 when the IP address is allocated / released to the AT 110. A function of registering with 160 is performed.

The session information database 134 stores and manages session information for the AT 110 currently connected to the portable Internet network. When the AT 110 performs an authentication and registration function, the AAA server 140 Obtain session information of the AT (110) from. The session information of the AT 110 may be used to obtain information such as whether the AT 110 is authenticated or what is the domain name of the AT 110.

Next, a process of allocating a DHCP address to the AT 110 in the portable Internet system will be described in detail with reference to FIG. 3.

3 is a diagram illustrating a DHCP address allocation process of a mobile terminal in a portable internet system according to an exemplary embodiment of the present invention.

As shown in FIG. 3, the AT 110 performs a user authentication and registration function to receive a DHCP service. Then, in order to receive a new IP address, a DHCPDISCOVER message for searching for a DHCP server 170 is transmitted to the DHCP server device 132 of the PAR 130 (S302). Upon receiving the DHCPDISCOVER message transmitted by the AT 110 to find the DHCP server 170, the DHCP server device 132 performs an authority verification function to determine whether the AT 110 is authenticated and legal (S304). This function is performed by searching the session information database 134 managed by the PAR 130 with the hardware address of the AT 110 included in the DHCPDISCOVER message.

If the authority verification result is an IP address allocation request by the legitimate AT 110, the DHCP server device 132 transmits a DHCPOFFER message to the AT 110 (S306). Upon receiving the DHCPOFFER message, the AT 110 transmits a DHCPREQUEST message to the DHCP server device 132 to request an address assignment (S308). Upon receiving the DHCPREQUEST message, the DHCP server device 132 allocates a dynamic IP address belonging to the subnet of the area of the PAR 130 to which the AT 110 is connected (S310), and transmits a DHCPACK message including the result to the AT 110. (S312) allows the AT 110 to receive DHCP service.

In addition, the DHCP server device 132 performs a dynamic DNS update for the domain name and the assigned IP address for the AT 110 (S314) to resolve the domain name or the IP address for the AT 110.

Next, a process of releasing the DHCP address of the AT 110 in the portable Internet system will be described in detail with reference to FIGS. 4 to 6.

4 is a diagram illustrating a DHCP address release process of a mobile terminal in a portable Internet system according to an embodiment of the present invention.

As shown in FIG. 4, the AT 110 transmits a DHCPRELEASE message to the DHCP server device 132 of the PAR 130 to terminate the portable Internet connection (S402).

Upon receiving the DHCPRELEASE message, the DHCP server device 132 releases the address resource so that another AT can use the IP address resource allocated to the AT 110 (S404). When the AT 110 receives an IP address, the DHCP server device 132 performs dynamic DNS update to delete domain name and IP address information of the AT 110 registered in the DNS server 160 (S406). .

5 is a diagram illustrating a DHCP address release process of a mobile terminal by an AP in a portable Internet system according to an embodiment of the present invention.

As shown in FIG. 5, when the wireless channel between the AT 110 and the AP 120 is abnormally released, the AP 120 sends a DREGreq message to the PAR 130 to terminate the service for the AT 110. It is to be transmitted (S502).

When the DHCP server device 132 receives the DREGreq message from the AT 110, the DHCP server device 132 releases the IP address assigned to the AT 110 (S504), and when the AT 110 is assigned an IP address, the DNS server ( Dynamic DNS updating is performed to delete domain name and IP address information of AT 110 registered at 160 (S506). Then, the DHCP server device 132 transmits a DREGrsp message to the AP 120 (S508).

6 is a diagram illustrating a DHCP address release process of a mobile terminal by a PAR in a portable Internet system according to an embodiment of the present invention.

As shown in FIG. 6, when the timer for Leasetime expires (S602) without extending / releasing the assigned address to the AT 110 (S602), the DHCP server device 132 of the PAR 130 is connected to the AT 110. The address resource is released in order to allow another AT to use the allocated address resource (S604). Then, the DHCP server device 132 performs dynamic DNS update to delete the domain name and IP address information of the AT 110 registered in the DNS server 160 when the AT 110 is assigned an IP address. In operation S 606, a DREGreq message is transmitted to the AP 120 to release the service for the AT 110 (S 608).

Lastly, a process of processing a message received from the AT 110, the AP 120, and the DNS server 160 by the DHCP server device 132 of the portable Internet system according to an embodiment of the present invention is illustrated in FIGS. 7A to 7. This will be described in detail with reference to 7e.

7A to 7E are diagrams illustrating a message processing procedure in a DHCP relay apparatus of a portable Internet system according to an embodiment of the present invention.

As shown in FIG. 7A, when the DHCP server apparatus 132 of the PAR 130 receives the DHCPDISCOVER message from the AT 110 (S701), the AT 110 is authenticated and legally authenticated through the session information database 134. AT authority verification is performed to confirm whether the user (S702). This is done by searching the session information database 134 with the hardware address of the AT 110 included in the DHCPDISCOVER message. At this time, if the AT authority verification fails, the DHCP server device 132 determines that it is an illegal user and discards the message received from the AT 110 (S703-S704). On the contrary, if the AT authority verification succeeds, the DHCP server device 132 allocates an address for the subnet of the corresponding PAR 130 and transmits a DHCPOFFER message to the AT 110 as a result (S705).

Next, as shown in FIG. 7B, when the DHCP server device 132 of the PAR 130 receives the DHCPREQUEST message from the AT 110 (S711), whether the message is a message for initial address assignment or not is previously assigned. Check whether the message is for extending the leasetime for the address (S712). As a result of the check, the DHCP server device 132 extends the Leasetime for this address if it is a message for extending Leasetime (S714), and allocates a new address resource to the AT 110 if it is a message for initial address allocation. (S713).

Thereafter, the DHCP server apparatus 132 checks the address resource allocation or Leasetime extension result (S715), and if the address resource allocation or Leasetime extension result is unsuccessful, transmits a DHCPNAK message to the AT 110 (S717). On the other hand, the DHCP server device 132 transmits a DHCPACK message to the AT (110) if the address resource allocation or Leasetime extension result is successful (S716). The DHCP server device 132 registers the domain name and the newly assigned address for the AT 110 in the DNS server 160 (S718), and the communication station that wants to transmit packet data to the AT 110 through the DNS query. Allow packet data to be transmitted to the AT 110.

As illustrated in FIG. 7C, when the DHCP server device 132 receives a DHCPRELEASE message from the AT 110 (S721), the DHCP server device 132 may use an address resource allocated to the AT 110 to allow another AT 110 to use the address resource. Release the resource (S722). Then, when the AT 110 receives an IP address, the DHCP server device 132 performs dynamic DNS update to delete domain name and IP address information of the AT 110 registered in the DNS server 160 (S723). ).

Next, as shown in FIG. 7D, when the wireless channel between the AT 110 and the AP 120 is abnormally terminated, when the DHCP server apparatus 132 receives a DREGreq message from the AP 120 (S731), The DHCP server device 132 releases the address resource so that the other AT 110 can use the address resource allocated to the AT 110 (S732). Then, the DHCP server device 132 performs dynamic DNS update to delete the domain name and IP address information of the AT 110 registered in the DNS server 160 when the AT 110 is assigned an address (S723). . Thereafter, the AP 120 transmits a DREGrsp message (S734).

Finally, as shown in FIG. 7E, the DHCP server device 132 has an address assigned to the AT 110 when the timer for Leasetime expires (S741) without the extension / release of the address assigned by the AT 110 (S741). The address resource is released so that the resource can be used by another AT 110 (S742). Then, the DHCP server device 132 performs dynamic DNS update to delete the domain name and IP address information of the AT 110 registered in the DNS server 170 when the AT 110 is assigned an IP address (S743). In order to release the service for the AT 110, a DREGreq message is transmitted to the AP 120 (S744).

As described above, the DHCP server device 132 of the portable Internet system according to an embodiment of the present invention is mounted in the PAR 130 performing a packet access routing function to directly access the session information database 134 of the PAR 130. Search and determine whether the mobile terminal is authenticated, assign an IP address, and support update of the DNS server when the IP address is assigned. By doing so, it is possible to prohibit Internet access to an illegal user without additional entities, and additionally, the DNS can be updated to enable a mobile station to communicate with the mobile terminal by performing a DNS lookup.

The above embodiments are intended to illustrate the present invention, the scope of the present invention is not limited to the embodiments, it can be modified or modified by those skilled in the art within the scope of the invention defined by the appended claims.

According to the present invention, the authority for the DHCP address request message of the mobile terminal in the DHCP server device operating in the PAR of the mobile Internet system for the mobile terminal using the DHCP service in the mobile Internet system that can provide both DHCP and MIP services By assigning an address for the mobile terminal after performing the verification, it is possible to prevent the allocation of address resources to unauthorized users, i.e., illegal users.

In addition, it is possible to update the DNS so that a communication station that wants to communicate with the mobile terminal can communicate with the mobile terminal through a DNS query.

Claims (14)

In a DHCP server device for allocating and releasing a Dynamic Host Configuration Protocol (DHCP) address of a mobile terminal in a portable Internet system, An address resource management unit for managing address resources that can be allocated to a corresponding packet access router (PAR) area; A network interface unit providing an interface for performing DHCP address assignment / release of the mobile station; And Allocates or releases a DHCP address of the mobile station by requesting a DHCP address allocation or release of the mobile station, and retrieves session information of the mobile station based on a hardware address of the mobile station for a DHCP address allocation request from the mobile station; DHCP message processing unit for assigning an address through the address resource management unit after performing the authorization verification of the mobile terminal through DHCP server device of a mobile Internet system comprising a. The method of claim 1, The DHCP message processing unit requests to update DNS (Domain Name Server) information of the mobile terminal according to the address assignment or release of the mobile terminal, Domain name / address mapping management unit for updating the DNS information for the request of the DHCP message processing unit DHCP server device of the mobile Internet system further comprising. delete The method of claim 1, The PAR is a DHCP server device of a portable Internet system including a session information database that stores session information for a mobile terminal. The method of claim 4, wherein And the session information is obtained from an AAA (Authentication, Authorization and Accounting) server that performs an authentication function for the mobile terminal when registering or authenticating the mobile terminal. The method of claim 2, The DHCP message processing unit, the DHCP server device of the mobile Internet system to recognize the expiration of the lease time for the address of the mobile terminal to release the address of the mobile terminal. The method of claim 2, And the DNS information comprises a domain name of a mobile terminal and an IP address corresponding to the domain name. The method according to any one of claims 1, 2 or 4 to 7, The DHCP server is a DHCP server device of a portable internet system mounted in the PAR. In the packet access router for performing a DHCP (Dynamic Host Configuration Protocol) address assignment or release to the mobile terminal in the portable Internet system, A session information database in which session information for a mobile terminal is stored; And When a DHCP address allocation request is received from the mobile station, the mobile station performs an authorization verification for the mobile station by searching the session information database based on the hardware address of the mobile station, and allocates an address to the mobile station. DHCP server unit for updating DNS (Domain Name Server) information for the mobile station when address assignment or release Packet access router comprising a. The method of claim 9, The DHCP server unit, An address resource management unit for managing address resources that can be allocated to a corresponding packet access router (PAR) area; A domain name / address mapping manager for updating DNS (Domain Name Server) information of the mobile terminal according to the address assignment or release of the mobile terminal; A network interface unit providing an interface for performing DHCP address assignment or release of the mobile station; And After performing the authority verification of the mobile station's DHCP address allocation request transmitted from the mobile terminal through the network interface, an address is allocated through the address resource manager, and the domain name / address mapping manager DHCP message processing unit for updating the DNS information of the mobile terminal according to the address assignment or release of the mobile terminal Packet access router comprising a. In the service providing method of the DHCP server device for allocating and releasing a Dynamic Host Configuration Protocol (DHCP) address of a mobile terminal in a portable Internet system, a) receiving a DHCP address assignment request message from a mobile station; b) performing authorization verification of the mobile station by retrieving session information of the mobile station based on the hardware address of the mobile station included in the DHCP address assignment request message; And c) allocating an address for the mobile terminal whose authorization verification is completed in step b); Service providing method of the DHCP server device comprising a. The method of claim 11, After step c), Updating the DNS information by registering Domain Name Server (DNS) information of the mobile terminal; Service providing method of the DHCP server device further comprising. The method of claim 12, After the step c), recognizing the expiration of the lease time for the address assigned to the mobile terminal and releasing the address of the mobile terminal. The method according to any one of claims 11 to 13, The DHCP address assignment request message includes an address lease time extension request message for the mobile station, Extending the address of the mobile terminal in step c) upon receiving the lease time extension request message How to service a DHCP server device.

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