KR101331561B1 - Method for assigning private ip and renewing private ip, and ip sharer using thereof - Google Patents

Abstract

A method for assigning an internet protocol (IP) according to the present invention comprises steps of: an IP sharer receiving the officially approved IP assigned by a system of an internet service provider (ISP); the IP sharer detecting a dynamic host configuration protocol (DHCP) discover message transmitted by an end device; the IP sharer determining whether a first identifier, for identification of a specific terminal, is included in the DHCP discover message; and the IP sharer determining whether a DHCP offer message is transmitted to the end device according as the first identifier is included in the DHCP discover message. [Reference numerals] (100) IP sharer;(200) End device;(S301) Assign an officially approved IP;(S302) DHCP Discover message (+ VoIP identifier);(S303) Determine whether the message has been transmitted by a VoIP device;(S304) DHCP Offer message;(S305) ARP broadcasting;(S306) DHCP Request message;(S307) DHCP ACK message

Description

Method of allocating and updating private IP, IP router using the same {METHOD FOR ASSIGNING PRIVATE IP AND RENEWING PRIVATE IP, AND IP SHARER USING THEREOF}

The present invention provides a method for allocating or updating a private IP to a specific type of terminal and an IP router using the same.

Voice over Internet Protocol (VoIP) service, which has recently been an issue, is a communication technology that implements voice calls through packet data based on IP networks such as high speed internet. Since the existing voice call service transmits and receives voice data using a dedicated communication line, the real time of the call can be guaranteed at any time. On the other hand, VoIP service shares the same line as communication data generated from other terminals (for example, computer, mobile phone, tablet PC, etc.) in addition to voice data generated from VoIP terminal. If it must pass, there is a case where the real-time performance of the VoIP service is not guaranteed.

In particular, in an office environment in which a plurality of devices such as computers, printers, VoIP, and the like are connected to one IP router, when excessive traffic is caused to the IP router, there may be a problem in that it is impossible to guarantee the real-time performance of the VoIP service.

An object of the present invention is to assign a private IP only to a specific type of terminal.

More specifically, an object of the present invention is to assign a private IP only to a VoIP terminal by determining whether a predetermined identifier is included in a message transmitted from an end device in a private IP request.

By allocating private IP only to the VoIP terminal, it is an object to prevent excessive traffic of the IP router and to ensure real-time service of the VoIP service.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

Private IP allocation method according to an embodiment of the present invention, the IP (Internet Protocol) router (IP) router receiving a public IP from a system of a predetermined Internet service provider (Internet Service Provider, ISP); Detecting, by the IP router, a Dynamic Host Configuration Protocol (DHCP) discovery message sent from an end device; Determining whether the IP router includes a first identifier for identifying that the DHCP discovery message is a specific terminal; And determining, by the IP router, whether to send a DHCP Offer message to the end device based on whether the first identifier is included in the DHCP discovery message.

In this case, the specific terminal may be a Voice over IP (VoIP) terminal.

The private IP allocation method according to another embodiment of the present invention comprises the steps of: an IP (Internet Protocol) IP router is allocated a public IP from a system of a predetermined Internet service provider (ISP); Detecting, by the IP router, a Dynamic Host Configuration Protocol (DHCP) discovery message sent from an end device; Sending, by the IP router, a DHCP Offer message to the end device in response to the DHCP discovery message; The IP router receiving a DHCP request message from the end device; Determining whether the IP router includes an identifier for identifying that the DHCP request message is a specific terminal; And determining whether to allocate a private IP to the end device based on the determination result.

An IP updating method according to an embodiment of the present invention comprises the steps of: an Internet Protocol (IP) router receiving an IP update request signal for requesting an update of an allocated private IP from an end device to which a private IP is assigned; Determining whether the IP router includes an identifier for identifying that the IP update request signal is a specific terminal; And determining, by the IP router, whether to update the private IP allocated to the end device based on the determination result.

The IP router according to an embodiment of the present invention includes a broadband network (WAN) interface unit for connection with a predetermined Internet service provider system; A local area network interface unit including one or more ports for performing a wired or wireless connection with one or more end devices; An address management module for storing a public IP (IP) address allocated from the Internet service provider system and a private IP assignment; And upon receiving an IP allocation signal from the end device, determine whether the IP allocation signal includes an identifier for identifying that the terminal is a specific terminal, and determine whether the IP allocation signal includes the identifier. It may include a control unit for controlling whether to assign a private IP.

According to another embodiment of the present invention, an IP router includes: a broadband network (WAN) interface unit for accessing a predetermined Internet service provider system; A local area network interface unit including one or more ports for performing a wired or wireless connection with one or more end devices; An address management module for storing a public IP (IP) address allocated from the Internet service provider system and a private IP assignment; And upon receiving an IP reassignment signal from the end device, determine whether the IP reassignment signal includes an identifier for identifying a specific terminal, and determine whether the IP reassignment signal includes the identifier. It may include a control unit for controlling whether to extend the lease period of the private IP assigned to the end device.

IP router according to another embodiment of the present invention includes a broadband network (WAN) interface unit for connecting to a predetermined Internet service provider system; A local area network interface unit including one or more ports for performing a wired or wireless connection with one or more end devices; An address management module for storing a public IP (IP) address allocated from the Internet service provider system and a private IP assignment; And when a DHCP discovery message broadcast from the end device is detected, in response to the DHCP discovery message, transmit a first DHCP provision message including a fake IP, and send a DHCP rejection message from the end device. Is transmitted, it is determined whether the DHCP rejection message includes an identifier for identifying a specific terminal, and whether to assign a private IP to the end device according to whether the DHCP rejection message includes the identifier. It may include a control unit for determining.

The technical solutions obtained by the present invention are not limited to the above-mentioned solutions, and other solutions not mentioned are clearly described to those skilled in the art from the following description. It can be understood.

According to the present invention, a private IP can be assigned only to a specific type of terminal.

By assigning a private IP only to a specific type of terminal, it is possible to prevent the traffic of the IP router from being exceeded.

If the terminal of a particular bird is a VoIP terminal, it is possible to ensure the real-time of the VoIP service.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

1 is a schematic diagram of a system in which an IP router provides a private IP to a VoIP terminal.
FIG. 2 is a block diagram of the IP router shown in FIG.
3 is a flowchart of a process of allocating a private IP to a VoIP terminal using a DHCP discovery message.
4 is a flowchart of a process of allocating a private IP to a VoIP terminal using a DHCP request message.
5 is a flowchart of a process of allocating a private IP to a VoIP terminal using a DHCP discovery message and a DHCP request message.
6 is a flowchart of a process of allocating a private IP to a VoIP terminal using a DHCP rejection message.
7 is a flowchart of a process of updating a private IP assigned to a VoIP terminal by using a DHCP request message.
8 is an exemplary diagram for explaining that an identifier is added between DHCP messages between an end device and an IP router, respectively.

Hereinafter, the IP sharer 100 related to the present invention will be described in detail with reference to the accompanying drawings. The suffixes "parts" and "modules" used in the following description are given or mixed in consideration of ease of specification, and do not have distinct meanings or roles.

1 is a schematic diagram of a system in which the IP router 100 provides a private IP to a VoIP terminal. Referring to FIG. 1, in order to provide a private IP to a VoIP terminal, the IP router 100 may include an internet service provider system 300, an IP router 100, and at least one end device 200.

The Internet service provider system 300 is a system for providing an Internet connection service to various kinds of end devices 200 that connect to their networks. In the present invention, in particular, in order to allow the VoIP terminal to access the Internet, the Internet service provider system 300 may assign a public IP to the IP router 100 interworking with the VoIP terminal through wired or wireless communication. In addition, the Internet service provider system 300 may assign a class (classes A, B, and C) of the subnet mask to the IP router 100. The subnet mask may be used by the IP router 100 to separate the network ID and the host ID, and may be used by the IP router 100 to form a plurality of subnets.

The IP sharer 100 allocated with the public IP from the Internet service provider system 300 may control the private IP to be allocated to the VoIP terminal of the end device 200. Unlike public IP, which is an open IP, a private IP, which is a closed IP, is controlled to be allocated to the VoIP terminal, thereby reducing the security risk of the VoIP terminal.

In this case, the IP sharer 100 may prevent the private IP from being allocated to non-VoIP terminals other than the VoIP terminal among the end devices 200. Specifically, the IP router 100 may control to allocate a private IP only when the IP allocation signal transmitted from the end device 200 includes an identifier for identifying the VoIP terminal.

By assigning a private IP only to the VoIP terminal, the traffic passing through the IP router 100 is limited to the traffic used at the VoIP terminal. As a result, the IP router 100 may prevent traffic from being increased by blocking traffic flowing from the non-VoIP terminal, and at the same time, prevent transmission delay of voice data when using the VoIP service.

The VoIP terminal illustrated in FIG. 1 may be connected to the Internet by receiving a private IP from the IP router 100. The VoIP terminal to be assigned a private IP from the IP router 100 may be assigned a private IP by providing an IP allocation signal to the IP router 100. In this case, the IP allocation signal may be generated using Dynamic Host Configuration Protocol (DHCP). When the IP allocation signal is generated using DHCP, the IP allocation signal may include at least one of a DHCP discovery message and a DHCP request message.

FIG. 2 is a block diagram of the IP router 100 shown in FIG. 1. Referring to FIG. 2, the IP router 100 according to the present invention includes a wide area network (WAN) interface unit 110, a local area network (LAN) interface unit 120, an address management module 130, and a controller 140. It may include.

The broadband network interface unit 110 is for forming a network with a predetermined Internet service provider system 300. When a network is formed between the IP router 100 and the predetermined Internet service provider system 300 through the broadband network interface unit 110, the controller 140 controls the public IP to be provided from the Internet service provider system 300. can do.

The local area network interface unit 120 is for performing a wired or wireless connection with one or more end devices 200. The local area network interface unit 120 may include one or more ports for connecting with one or more end devices 200.

The address management module 130 stores a public IP address assigned from the Internet service provider system 300 and stores a private IP allocation history to the end device 200.

When the IP allocation signal or the IP reassignment signal is received from the end device 200, the controller 140 sends the private IP to the end device 200 according to whether an identifier for identifying the VoIP terminal exists in the IP allocation signal. You can decide whether to assign. In addition, the controller 140 may control the network address translation (NAT) to be applied to traffic flowing into or out of the VoIP terminal using the public IP address and the private IP address stored in the address management module 130. .

In allocating a private IP between the controller 140 and the end device 200, a dynamic host configuration protocol (DHCP) may be used. In this case, the IP assignment signal may be a DHCP discovery message or may include a DHCP request message or both, and the IP reassignment signal may include a DHCP rejection message.

In detail, the controller 140 determines whether the DHCP discovery message includes an identifier for identifying the VoIP terminal, or determines whether the DHCP request message includes an identifier for identifying the VoIP terminal. It may be determined whether or not to assign a private IP to (200).

Hereinafter, a method of allocating a private IP according to the present invention will be described in detail by distinguishing a case where an identifier is included in a DHCP search message and a case where an identifier is included in a DHCP request message.

3 is a flowchart illustrating a process of allocating a private IP to a VoIP terminal using a DHCP discovery message. Referring to FIG. 3, first, the IP router 100 may form a broadband network (WAN) with an Internet service provider system 300 and may be assigned a public IP from the Internet service provider system 300 (S301). The IP sharer 100 may be used to allow a VoIP terminal belonging to the same network (specifically, a local area network (LAN)) to use a VoIP service using a public IP. In detail, the IP router 100 may control the VoIP terminal to use the VoIP service through NAT (Network Address Translation) between the public IP and the private IP assigned to the VoIP terminal.

Thereafter, the IP router 100 may detect a DHCP discovery message broadcast from the end device 200 to which the private IP is to be allocated (S302). The DHCP discovery message is a message broadcast from the end device 200 to detect a DHCP server (specifically, the IP router 100).

When detecting the DHCP discovery message, the IP router 100 may determine whether the identifier for identifying the VoIP terminal is included in the DHCP discovery message (S303). If the identifier for identifying the VoIP terminal is not included in the DHCP discovery message, the IP router 100 may not respond to the DHCP discovery message. On the contrary, when it is determined that the DHCP discovery message includes an identifier for identifying the VoIP terminal, the IP router 100 may provide a DHCP Offer message to the end device 200 in response to the DHCP discovery message. (S304). The DHCP providing message may include a private IP to be allocated in the IP router 100.

The end device 200 receiving the DHCP provision message may perform ARP (Address Resolution Protocol) broadcasting on the allocated private IP (S305). When the other end device 200 having the same address as the private IP is detected through ARP broadcasting, the mobile terminal may provide a DHCP Decline message to the IP router 100. Upon receiving the DHCP rejection message, the IP router 100 may retransmit the DHCP providing message including the changed private IP to the end device 200.

On the contrary, when the other end device 200 having the same address as the private IP is not detected, the end device 200 sends a DHCP request message requesting to allocate a private IP in the DHCP providing message. ) Can be provided (S306). The IP router 100 receiving the DHCP request message may transmit a DHCP ACK message to the end device 200 to control the private IP allocation to the end device 200 to be completed (S307). After transmitting the DHCP ACK message, the control unit 140 of the IP sharer 100 sends an address management module 130 between the physical address of the end device 200 and the private IP assigned to the end device 200. You can save the mapping table. Using the mapping table, the controller 140 of the IP router 100 may apply NAT between the private IP and the public IP.

Although FIG. 3 illustrates that the IP router 100 determines whether the DHCP discovery message includes an identifier for identifying the VoIP terminal, whether or not the private IP is allocated to the end device 200 is determined. It is not necessary to determine whether to allocate private IP using.

Furthermore, although FIG. 3 illustrates that the ARP broadcasting is performed after the end device 200 receives the DHCP providing message, the ARP broadcasting is not necessarily performed after receiving the DHCP providing message. ARP broadcasting may be performed after receiving a DHCP ACK message.

Hereinafter, a process of determining whether to allocate a private IP to the end device 200 by using the DHCP request message by the IP router 100 will be described with reference to FIG. 4.

4 is a flowchart illustrating a process of allocating a private IP to a VoIP terminal using a DHCP request message. Since step S401 of FIG. 4 corresponds to step S301 of FIG. 3, a detailed description thereof will be omitted.

When the IP sharer 100 detects a DHCP discovery message broadcast from the end device 200 to which a private IP is to be allocated (S402), the IP sharer 100 responds to the DHCP discovery message and the end device ( In step 200, a DHCP offer message may be provided (S403).

The end device 200 receiving the DHCP provision message may perform ARP (Address Resolution Protocol) broadcasting on the allocated private IP (S404). If the other end device 200 assigned the same address as the private IP is not detected through ARP broadcasting, the end device 200 may transmit a DHCP request message (S405).

Upon receiving the DHCP request message from the end device 200, the IP router 100 may determine whether the DHCP discovery message includes an identifier for identifying the VoIP terminal (S406). If the identifier for identifying the VoIP terminal is not included in the DHCP request message, the IP router 100 may control the DHCP NACK message to be transmitted in response to the DHCP request message. On the contrary, when the DHCP request message includes an identifier for identifying the VoIP terminal, the IP router 100 may control the DHCP ACK message to be transmitted in response to the DHCP request message (S407). After transmitting the DHCP ACK message, the controller 140 of the IP sharer 100 may store a mapping table between the physical address of the end device 200 and the private IP assigned to the end device 200. Using the mapping table, the controller 140 of the IP router 100 may apply NAT between the private IP and the public IP.

That is, in FIG. 4, unlike FIG. 3, by determining whether the DHCP request message includes an identifier for identifying the VoIP terminal, the end device 200 determines whether to allocate a private IP.

However, as shown in FIGS. 3 and 4, only one of the DHCP discovery message and the DHCP request message should not include an identifier for identifying the VoIP terminal. For example, the IP may control whether to allocate a private IP to the end device 200 by determining whether both an DHCP discovery message and a DHCP request message include an identifier for identifying the VoIP terminal. For example, FIG. 5 is a flowchart illustrating a process of allocating a private IP to a VoIP terminal using a DHCP discovery message and a DHCP request message.

3, 4, and 5, the IP router 100 of FIG. 5 determines whether an identifier for identifying a VoIP terminal is included in both a DHCP discovery message and a DHCP request message. (S503, S507). In this case, as shown in FIG. 3 and FIG. 4, the IP router 100 will provide the DHCP providing message to the end device 200 only when the DHCP discovery message includes an identifier for identifying the VoIP terminal. In operation S504, the DHCP ACK message may be returned to the end device 200 only when the DHCP request message includes an identifier for identifying the VoIP terminal in operation S508.

In FIG. 5, the identifier included in the DHCP discovery message and the identifier included in the DHCP request message may be the same, but are not necessarily the same. The identifier (first identifier) included in the DHCP discovery message and the identifier (second identifier) included in the DHCP request message may have different strings.

3 to 5 illustrate that the private IP is allocated to the end device 200 only when an identifier for identifying the VoIP terminal is added to an IP allocation signal such as a DHCP discovery message and / or a DHCP request message. 3 to 5, if the VoIP terminal must add an identifier for identifying the VoIP terminal to the DHCP discovery message or the DHCP request message, the IP router 100 according to the present invention and the related art There may be a problem that it is not compatible with the IP router 100.

To prevent this, the IP router 100 may determine whether to allocate a private IP to the end device 200 based on the IP reassignment signal. Detailed description thereof will be made with reference to FIG. 6.

6 is a flowchart illustrating a process of allocating a private IP to a VoIP terminal using a DHCP rejection message. Since step S601 of FIG. 6 is the same as step S301 of FIG. 3, a detailed description thereof will be omitted.

When the IP sharer 100 detects a DHCP discovery message broadcast from the end device 200 to which a private IP is to be allocated (S602), the IP sharer 100 provides a first DHCP response (Offer) in response thereto. Message may be provided (S603). In this case, the IP router 100 (specifically, the control unit 140 of the IP router 100) may control the fake IP to be included in the first DHCP providing message. The dummy IP may not be used as a private IP in the end device 200, and may be a private IP already used in another end device 200 or a public IP assigned to the IP router 100.

The end device 200 which has received the first DHCP provision message may perform ARP broadcasting on the dummy IP included in the first DHCP provision message (S603). Since the dummy IP is the same as the address currently being used by the other end device 200 or the IP router 100, the end device 200 will provide a DHCP Decline message to the IP router 100 (S604).

Upon receiving the DHCP rejection message from the end device 200, the IP router 100 may determine whether the DHCP rejection message includes an identifier for identifying the VoIP terminal (S605). If the identifier for identifying the VoIP terminal is not included in the DHCP rejection message, the IP router 100 may not respond to the DHCP rejection message. On the contrary, when the DHCP reject message includes an identifier for identifying the VoIP terminal, the IP router 100 may provide a second DHCP offer message to the end device 200 (S606). The second DHCP providing message may include a private IP to be truly assigned to the end device 200.

The end device 200 provided with the second DHCP provision message may perform ARP broadcasting on the private IP included in the second DHCP provision message (S607). When the private IP included in the second DHCP providing message is to be allocated, the end device 200 may provide a DHCP request message to the IP router 100 (S608). The IP router 100 receiving the DHCP request message may transmit a DHCP ACK message to the end device 200 to control the private IP allocation to the end device 200 to be completed (S609). After transmitting the DHCP ACK message, the control unit 140 of the IP router 100 provides the address management module 130 with a mapping table between the physical address of the end device 200 and the private IP assigned to the end device 200. Can be stored. Using the mapping table, the controller 140 of the IP router 100 may apply NAT between the private IP and the public IP.

That is, in the example of FIG. 6, the VoIP terminal (end device 200) is a VoIP terminal for an IP allocation signal such as a DHCP discovery message or a DHCP request message that is basically used to receive a private IP from the IP router 100. It can be controlled to not include an identifier that can be identified as a. By inserting an identifier for identifying the VoIP terminal into the IP reassignment signal rather than the IP allocation signal, the present invention can be interworked with the IP sharer 100 different from the present invention.

3 to 6, the DHCP providing message may further include a lease duration timer along with the private IP to be allocated. The end device 200 assigned the DHCP providing message from the IP router 100 (that is, receiving a DHCP ACK message) may use the private IP until the rental time timer expires.

If you want to continuously use the private IP assigned from the IP router 100, the end device 200 is private to the IP router 100 before the rental time timer expires (for example, when 50% of the rental time timer is in progress). You can request to renew the IP. Detailed description thereof will be made with reference to FIG. 7.

7 is a flowchart illustrating a process of updating a private IP assigned to a VoIP terminal using a DHCP request message.

The end device 200 may request the IP router 100 to renew the private IP before the lease duration of the allocated private IP expires from the IP router 100 (S701). In this case, the renewal request signal of the private IP may be in the form of a DHCP request message, and the lease duration of the private IP is provided by DHCP provided when the first private IP is allocated to the end device 200. ) May be defined in the message.

In this case, when the response to the DHCP request message is not received from the IP router 100 within a predetermined time, the end device 200 may broadcast a DHCP request message.

The control unit 140 of the IP router 100 may determine whether to renew the private IP according to whether the private IP update request signal received from the end device 200 includes an identifier for identifying the VoIP terminal (see FIG. S702). For example, if the DHCP request message includes an identifier for identifying the VoIP terminal, the DHCP ACK message will be transmitted. Otherwise, the DHCP NACK message can be transmitted to prevent the lease time of the private IP from being extended (S703). .

When a DHCP ACK message is transmitted from the IP router 100, the lease duration is initialized, and the end device 200 may use a private IP for a lease time (S704).

In the above-described embodiment, only the DHCP message (DHCP discovery message, DHCP request message, and / or DHCP rejection message) provided from the end device 200 to the IP router 100 includes an identifier for identifying the VoIP terminal. Although illustrated as being, the DHCP message provided from the IP router 100 to the end device 200 may also include an identifier for the IP router that is the same as or different from the above-described identifier.

For example, FIG. 8 is an exemplary diagram for explaining that an identifier is added between DHCP messages between the end device 200 and the IP router 100, respectively. Since the identifier is included in the DHCP message provided from the end device 200 to the IP router 100, the description thereof will be omitted. In providing the DHCP message (DHCP providing message and / or DHCP ACK / NACK message) to the end device 200 in the IP router 100, the IP router 100 may control the DHCP message to include an identifier for the IP router. (S804 and S809). The end device 200 determines whether the identifier for the IP router is included in the DHCP message received from the IP router 100 (S805 and S810), and then proceeds to the next step only when the DHCP message is included for the IP router. Can be. For example, if it is determined that the identifier for the IP router is not included in the DHCP providing message, the end device 200 may not perform the steps such as ARP broadcasting (S806) and sending a DHCP request message (S807). In the embodiment shown in FIGS. 3-8, ARP broadcasting is illustrated as being performed only at the end device 200, but ARP broadcasting may also be performed at the IP router 100. For example, the IP router 100 may determine whether the private IP to be allocated is already in use by performing ARP broadcasting before generating the DHCP providing message. The private IP can be assigned only to the terminal, but the assignment target of the private IP is not necessarily limited to the VoIP terminal. Even if the IP sharer 100 according to the present invention is not a VoIP terminal, it can be used to assign a private IP only to a specific type of terminal such as a mobile phone, a tablet PC, a PDA, a navigation, a notebook, and the like. For example, the IP router 100 according to the present invention may be used to assign a private IP only to a mobile phone subscribed to a specific communication company.

According to one embodiment of the present invention, the above-described method (operation flow diagram) can be implemented as a code that can be read by a processor on a medium on which the program is recorded. Examples of the medium that can be read by the processor include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, etc., and may be implemented in the form of a carrier wave (e.g., transmission over the Internet) .

The IP router 100 described above may not be limitedly applied to the configuration and method of the above-described embodiments, but the embodiments may be selectively combined with all or some of the embodiments so that various modifications may be made. It may be configured.

100: IP Router
110: WAN interface unit
120: LAN interface unit
130: address management module
140:
200: end device
300: Internet Service Provider (ISP) System

Claims (45)

Receiving, by an Internet Protocol (IP) router, a public IP from a system of a predetermined Internet Service Provider (ISP);
Detecting, by the IP router, a Dynamic Host Configuration Protocol (DHCP) discovery message sent from an end device;
Determining whether the IP router includes a first identifier for identifying that the DHCP discovery message is a specific terminal; And
Determining, by the IP router, whether to send a DHCP Offer message to the end device based on whether the first identifier is included in the DHCP discovery message.
Private IP allocation method comprising a. The method of claim 1,
The specific terminal is a VoIP (Voice over IP) terminal, characterized in that the private IP allocation method. The method of claim 1,
If the DHCP discovery message does not include the first identifier,
The IP router does not correspond to the DHCP discovery message. The method of claim 1,
If the DHCP discovery message includes the first identifier,
And the IP router transmits the DHCP provision message to the end device. 5. The method of claim 4,
Sending, by the IP router, the DHCP provision message to the end device;
The IP router receiving a DHCP request message from the end device; And
Determining whether the IP router includes a second identifier for identifying the specific terminal as the DHCP request message;
Private IP allocation method further comprising a. The method of claim 5, wherein
If the DHCP request message includes the second identifier,
The IP router allocates a private IP to the end device. The method according to claim 6,
When the assignment of the private IP to the end device is completed,
And the IP router converts a private IP, which is a source address of a packet generated from the end device, into the public IP. The method of claim 5, wherein
If the DHCP request message does not include the second identifier,
The IP router allocates a private IP message to the end device. 5. The method of claim 4,
The DHCP providing message includes a private IP to provide to the end device private IP allocation method. The method of claim 8,
The DHCP providing message further includes a lease duration of the private IP. Receiving, by an Internet Protocol (IP) router, a public IP from a system of a predetermined Internet Service Provider (ISP);
Detecting, by the IP router, a Dynamic Host Configuration Protocol (DHCP) discovery message sent from an end device;
Sending, by the IP router, a DHCP Offer message to the end device in response to the DHCP discovery message;
The IP router receiving a DHCP request message from the end device;
Determining whether the IP router includes an identifier for identifying that the DHCP request message is a specific terminal; And
Determining whether to allocate a private IP to the end device based on the determination result;
Private IP allocation method comprising a. The method of claim 11,
The specific terminal is a VoIP (Voice over IP) terminal, characterized in that the private IP allocation method. The method of claim 11,
If the DHCP request message includes the identifier,
The IP router allocates a private IP to the end device. The method of claim 13,
When the assignment of the private IP to the end device is completed,
And the IP router converts a private IP, which is a source address of a packet generated from the end device, into the public IP. The method of claim 13,
If the DHCP request message does not contain the identifier,
The IP router allocates a private IP message to the end device. The method of claim 11,
The DHCP providing message includes a private IP to provide to the end device private IP allocation method. 17. The method of claim 16,
The DHCP providing message further includes a lease duration of the private IP. Receiving, by an Internet Protocol (IP) router, an IP update request signal for requesting an update of the allocated private IP from an end device to which the private IP is assigned;
Determining whether the IP router includes an identifier for identifying that the IP update request signal is a specific terminal; And
Determining, by the IP router, whether to update the private IP allocated to the end device based on the determination result
Update method of the private IP comprising a. The method of claim 18,
The specific terminal is a VoIP (Voice over IP) terminal, characterized in that the renewal method of the private IP. The method of claim 18,
The IP update request signal is a renewal method of a private IP, characterized in that the DHCP (Dynamic Host Configuration Protocol) request (Request) message. 21. The method of claim 20,
If the DHCP request message includes the identifier,
The IP router sends a DHCP ACK message to the end device. 21. The method of claim 20,
If the DHCP request message does not contain the identifier,
The IP router sends a DHCP NACK message to the end device. 21. The method of claim 20,
If a response to the DHCP request message is not received from the IP router within a predetermined time,
And the end device broadcasts the DHCP request message. The method of claim 18,
And the end device provides the IP renewal request signal to the IP router before the lease duration of the private IP provided from the DHCP provision message expires. 25. The method of claim 24,
When the DHCP ACK message is received from the IP router, the rental time is initialized. Receiving, by an Internet Protocol (IP) router, a public IP from a system of a predetermined Internet Service Provider (ISP);
Detecting, by the IP router, a Dynamic Host Configuration Protocol (DHCP) discovery message sent from an end device;
Sending, by the IP router, a first DHCP Offer message including a fake IP to the end device in response to the DHCP discovery message;
Receiving, by the IP router, a DHCP Decline message from the end device;
Determining whether the IP router includes an identifier for identifying that the DHCP reject message is a specific terminal; And
Determining whether to allocate a private IP to the end device based on the determination result;
Private IP allocation method comprising a. The method of claim 26,
The specific terminal is a VoIP (Voice over IP) terminal, characterized in that the private IP allocation method. The method of claim 26,
If the DHCP reject message includes the identifier,
And the IP router transmits a second DHCP provision message including a private IP to the end device. 29. The method of claim 28,
If the private IP is assigned to the end device,
And the IP router converts the private IP, which is a source address of a packet generated from the end device, into the public IP. The method of claim 26,
If the DHCP reject message does not contain the identifier,
The IP router does not correspond to the DHCP reject message, private IP allocation method. 29. The method of claim 28,
The second DHCP providing message further includes a lease duration of the private IP. A wide area network (WAN) interface for connecting to a predetermined Internet service provider system;
A local area network interface unit including one or more ports for performing a wired or wireless connection with one or more end devices;
An address management module for storing a public IP (IP) address allocated from the Internet service provider system and a private IP assignment; And
Upon receiving the IP allocation signal from the end device, it is determined whether the IP allocation signal includes an identifier for identifying that the terminal is a specific terminal.
A control unit controlling whether to allocate a private IP to the end device according to whether the identifier is included in the IP allocation signal
IP router, including. 33. The method of claim 32,
The specific terminal is an IP router, characterized in that the VoIP terminal. 33. The method of claim 32,
And the address management module maps and stores the physical address of the end device and the allocated private IP. 33. The method of claim 32,
The IP allocation signal is IP router, characterized in that generated using the DHCP (Dynamic Host Configuration Protocol). 36. The method of claim 35,
The IP allocation signal IP router includes at least one of a DHCP discovery message and a DHCP request message. The method of claim 36,
If the identifier is not included in the DHCP discovery message,
The controller does not respond to the DHCP discovery message. The method of claim 36,
If the identifier is included in the DHCP discovery message,
The control unit IP router, characterized in that for transmitting a DHCP request message to the end device. The method of claim 36,
If the identifier is included in the DHCP request message,
The control unit IP router, characterized in that for transmitting a DHCP ACK message to the end device. The method of claim 36,
If the identifier is included in the DHCP request message,
The control unit IP router, characterized in that for transmitting a DHCP NACK message to the end device. A wide area network (WAN) interface for connecting to a predetermined Internet service provider system;
A local area network interface unit including one or more ports for performing a wired or wireless connection with one or more end devices;
An address management module for storing a public IP (IP) address allocated from the Internet service provider system and a private IP assignment; And
Upon receiving the IP reassignment signal from the end device, it is determined whether the IP reassignment signal includes an identifier for identifying a specific terminal,
A control unit for controlling whether to extend the lease period of the private IP allocated to the end device according to whether the identifier is included in the IP reassignment signal
IP router, including. A wide area network (WAN) interface for connecting to a predetermined Internet service provider system;
A local area network interface unit including one or more ports for performing a wired or wireless connection with one or more end devices;
An address management module for storing a public IP (IP) address allocated from the Internet service provider system and a private IP assignment; And
If a DHCP discovery message broadcast from the end device is detected, in response to the DHCP discovery message, transmit a first DHCP provision message including a pseudo IP,
When the DHCP reject message is transmitted from the end device, it is determined whether the DHCP reject message includes an identifier for identifying that the terminal is a specific terminal.
A controller for determining whether to assign a private IP to the end device according to whether the identifier is included in the DHCP reject message
IP router, including. 43. The method of claim 42,
If the identifier is not included in the DHCP reject message,
The controller does not respond to the DHCP reject message. 43. The method of claim 42,
If the DHCP reject message includes the identifier,
And the controller transmits a second DHCP providing message including a private IP to be allocated to the end device. 45. The method of claim 44,
When the assignment of the private IP to the end device is completed,
And the controller converts the private IP which is the source address of the packet generated from the end device, into the public IP.

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