KR102378070B1 - Method of Controlling an IP Address Acquisition Procedure in a Dual Stack Home Gateway - Google Patents

Abstract

A method for controlling assignment of an IP address from a dual stack home gateway (HGW) is provided. The method includes the steps of transmitting a Neighbor Discovery Protocol (NDP) Route Solicitation (RS) message when the flash information indicates Internet Protocol version 6 (IPv6) or null information about the version - and performing a procedure for receiving an IP address according to the IPv6 protocol when an NDP RA (Router Advertisement) message is received in response to the transmission of the NDP RS message.

Description

{Method of Controlling an IP Address Acquisition Procedure in a Dual Stack Home Gateway}

The present invention relates to technology related to Internet Protocol.

Internet Protocol version 6 (IPv6) is a next-generation Internet protocol of version 6 proposed to solve the address exhaustion problem of IPv4, which is an existing Internet Protocol version. Since the IPv6 protocol has an address system of 128 bits, it has the advantage of being able to allocate an IP address with a margin compared to the IPv4 protocol that allocates an IP address with a length of 32 bits. For the IPv6 protocol, the international standard has already been confirmed through RFC (Request for Comments), and a network supporting the IPv6 protocol has been established. . Although the IPv6 network is gradually replacing the IPv4 network as described above, a dual stack network supporting both IPv4 and IPv6 protocols has been built to provide services in the transitional process from IPv4 protocol to IPv6 protocol. and dual-stack terminals to respond to this have also appeared. However, when a dual-stack terminal is connected to a dual-stack network, both an IP address according to the IPv4 protocol and an IP address according to the IPv6 protocol are allocated, and there is a possibility that the IP address according to the IPv4 protocol is unnecessary. In a situation where it is impossible to upgrade all currently operating terminals and networks to support the IPv6 protocol at once, by minimizing the use of IP addresses according to the IPv4 protocol, something is needed

An object of the present invention is to provide a method for controlling IP address allocation in a dual stack home gateway (HGW), which can prevent premature exhaustion of IP addresses according to the IPv4 protocol.

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

In one aspect, a method for controlling assignment of an IP address from a dual stack home gateway (HGW) is provided. The method includes the steps of transmitting a Neighbor Discovery Protocol (NDP) Route Solicitation (RS) message when the flash information indicates Internet Protocol version 6 (IPv6) or null information about the version - and performing a procedure for receiving an IP address according to the IPv6 protocol when an NDP RA (Router Advertisement) message is received in response to the transmission of the NDP RS message.

In one embodiment, the method is performed in response to the dual stack home gateway being newly booted or a new physical connection to the network being established.

In an embodiment, when the flash information is Null, the dual stack home gateway is newly opened.

In an embodiment, transmitting a Neighbor Discovery Protocol (NDP) Route Solicitation (RS) message when the flash information indicates Internet Protocol version 6 (IPv6) or is null - The flash information is previously operated by the home gateway Information about the old IP version - includes continuously transmitting the NDP RS message a predetermined number of times.

In an embodiment, the method further comprises repeating the transmission of the NDP RS message when the NDP RA message is not received in response to the transmission of the NDP RS message.

In an embodiment, when receiving an NDP Router Advertisement (RA) message in response to the transmission of the NDP RS message, performing a procedure for receiving an IP address according to the IPv6 protocol comprises: Dynamic Host Configuration Protocol Version 6 (DHCPv6) ) connecting to the server and performing a procedure for sending and receiving messages.

In an embodiment, the step of performing a procedure for exchanging messages by accessing the Dynamic Host Configuration Protocol Version 6 (DHCPv6) server includes continuously transmitting a solicit message to the DHCPv6 server a predetermined number of times.

In an embodiment, the method includes, when the dual stack home gateway succeeds in being assigned an IP address according to the IPv6 protocol, checking whether the flash information is null, if the flash information is not null operating the dual-stack home gateway with the IP address according to the IPv6 protocol, and if the flash information is null, updating the flash information so that the flash information indicates IPv6 and having the IP address according to the IPv6 protocol The method further includes operating the dual stack home gateway.

In another aspect, a method for controlling assignment of an IP address in a dual-stack home gateway is provided. In this method, when flash information indicates Internet Protocol version 4 (IPv4), performing a procedure for receiving an IP address according to the IPv4 protocol - The flash information is information about the IP version in which the home gateway was previously operated Im-, transmitting an NDP RS message when the dual-stack home gateway does not succeed in being assigned an IP address according to the IPv4 protocol, and receiving an NDP RA message in response to the transmission of the NDP RS message, The method may include performing a procedure for receiving an IP address according to the IPv6 protocol in response to confirming that the router that has transmitted the NDP RA message is an IPv6 router.

In one embodiment, the method is performed in response to the dual stack home gateway being newly booted or a new physical connection to the network being established.

In one embodiment, when the flash information indicates Internet Protocol version 4 (IPv4), performing a procedure for receiving an IP address according to the IPv4 protocol - The flash information is in the IP version in which the home gateway was previously operated Information about - includes the step of performing a procedure for sending and receiving messages by connecting to a DHCPv4 (Dynamic Host Configuration Protocol Version 4) server.

In an embodiment, the step of performing a procedure for exchanging messages by accessing the Dynamic Host Configuration Protocol Version 4 (DHCPv4) server includes continuously transmitting a discovery message to the DHCPv4 server a predetermined number of times.

In one embodiment, the step of transmitting the NDP RS message when the dual-stack home gateway does not succeed in being assigned an IP address according to the IPv4 protocol includes continuously transmitting the NDP RS message a predetermined number of times. include

In one embodiment, in response to receiving the NDP RA message in response to the transmission of the NDP RS message and confirming that the router that transmitted the NDP RA message is an IPv6 router, a procedure for receiving an IP address according to the IPv6 protocol The performing includes performing a procedure for sending and receiving messages by connecting to the DHCPv6 server.

In an embodiment, the step of performing a procedure for exchanging messages by accessing the DHCPv6 server includes continuously transmitting a solicit message to the DHCPv6 server a predetermined number of times.

In one embodiment, in response to receiving the NDP RA message in response to the transmission of the NDP RS message and confirming that the router that transmitted the NDP RA message is an IPv6 router, a procedure for receiving an IP address according to the IPv6 protocol The performing includes checking that the router that transmitted the NDP RA message is an IPv6 router by referring to the M flag and the O flag included in the NDP RA message.

In another aspect, a computer-readable recording medium recording a program is provided. wherein the program includes instructions, the instructions performing the method when executed by a computer.

According to embodiments of the present invention, there is a technical effect of controlling the IP address to be allocated in a manner that can prevent the premature exhaustion of the IP address according to the IPv4 protocol in the dual-stack home gateway.

1 shows a Dual Stack Home Gateway (HGW) supporting both IPv4 and IPv6 IP address It is a diagram showing an embodiment of a network configuration diagram for illustrating that the is allocated.
2A and 2B are diagrams illustrating an embodiment of a flowchart for explaining a method of controlling assignment of an IP address in a dual-stack home gateway.

Advantages and features of the present invention and a method of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and these embodiments merely allow the disclosure of the present invention to be complete and those of ordinary skill in the art to which the present invention pertains. It is provided to fully inform the person of the scope of the invention, and the present invention is only defined by the scope of the claims.

The terms used herein are used only to describe specific embodiments and are not intended to limit the present invention. For example, a component expressed in a singular should be understood as a concept including a plurality of components unless the context clearly means only the singular. In addition, in the specification of the present invention, terms such as 'include' or 'have' are only intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, and such The use of the term does not exclude the possibility of the presence or addition of one or more other features or numbers, steps, operations, components, parts, or combinations thereof. In addition, in the embodiments described in this specification, a 'module' or 'unit' may mean a functional part that performs at least one function or operation.

In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the specification of the present invention, it should be interpreted in an ideal or excessively formal meaning. doesn't happen

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. However, in the following description, if there is a risk of unnecessarily obscuring the gist of the present invention, detailed descriptions of well-known functions or configurations will be omitted.

1 shows a Dual Stack Home Gateway (HGW) supporting both IPv4 and IPv6 IP address It is a diagram showing an embodiment of a network configuration diagram to illustrate the allocation of .

As shown in FIG. 1, the Dual Stack Network 150 supporting IPv4 and IPv6 includes a Dual Stack Router 125 supporting IPv4 and IPv6, and an IPv6 router 135 supporting only IPv6. , 175) and IPv4 routers 145 and 165 supporting only IPv4 are deployed. The dual stack network 150 is also connected to a DHCPv4 server 160 that allocates a 32-bit (bits) long IP address according to the IPv4 protocol and a DHCPv6 server 170 that allocates a 128-bit long IP address according to the IPv6 protocol. has been A dual-stack home gateway (HGW, 120, 130, 140) supporting IPv4 and IPv6 separates a wired/wireless home network connected thereto and the external Internet such as the illustrated dual-stack network 150, and separates them between them. It not only interconnects and mediates the home network, but also plays a role in supporting mutual communication between devices constituting the home network. In an embodiment, the dual-stack home gateway 120 is implemented as any one of a wired/wireless router supporting IPv4 and IPv6 and any other devices functioning as an access point (AP). In the illustrated embodiment, the PC 122 , the IPTV set-top box 124 , the smart phone 126 , and the notebook 128 are connected to the dual-stack home gateway 120 as devices constituting the home network, but the dual-stack home gateway 120 . It should be noted that the device that can be connected to the gateway 120 is not limited thereto. The dual-stack home gateway 120 may access the DHCPv4 server 160 through the dual-stack router 125 to receive an IP address of 32-bit length according to the IPv4 protocol, or access the DHCPv6 server 170 to access the IPv6 protocol. Accordingly, a 128-bit IP address may be allocated. The dual-stack home gateway 130 may access the DHCPv6 server 170 through the IPv6 router 135 supporting only IPv6 and receive an IP address having a length of 128 bits according to the IPv6 protocol. The dual-stack home gateway 140 may access the DHCPv4 server 160 through the IPv4 router 145 supporting only IPv4 and receive an IP address of 32-bit length according to the IPv4 protocol.

When the dual stack home gateway 120 transmits a Neighbor Discovery Protocol (NDP) Router Solicitation (RS) message to the dual stack network 150 , the same data link as the dual stack home gateway 120 within the dual stack network 150 . Any one router located on the above receives the NDP RS message and transmits an NDP RA (Router Advertisement) message to the dual stack home gateway 120 in response thereto. According to the disclosed technology, the NDP RA message may include a parameter for identifying the router that transmitted the message. In the illustrated embodiment, since the dual-stack router 125 and the router located on the same data link as the dual-stack home gateway 120 are the dual-stack routers 125, the parameters included in the NDP RA message received by the dual-stack home gateway 120 are the dual-stack routers. (125) is identified. In an embodiment, the parameter identifying the router may include an M flag and an O flag. In one embodiment, the parameter identifying the dual stack router includes an M flag set to 1 and an O flag set to 0. In response to confirming that the router that has transmitted the NDP RA message is the dual-stack router 125, the dual-stack home gateway 120 accesses the DHCPv4 server 160 through the dual-stack router 125 to access the IP address according to the IPv4 protocol. It is also possible to be assigned an address and to access the DHCPv6 server 170 to receive an IP address according to the IPv6 protocol, but according to the disclosed technology, in the above case, the dual stack router 125 connects to the DHCPv6 server 170 and Controlled to be assigned an IP address according to the IPv6 protocol.

When the dual-stack home gateway 130 transmits an NDP RS message to the dual-stack network 150 , an NDP from any router located on the same data link as the dual-stack home gateway 130 within the dual-stack network 150 . The RS message is received and an NDP RA message is transmitted to the dual stack home gateway 130 in response thereto. In the illustrated embodiment, since the router located on the same data link as the dual-stack home gateway 130 is the IPv6 router 135, the parameters included in the NDP RA message received by the dual-stack home gateway 130 are the IPv6 router 135. ) is identified. In one embodiment, the parameter identifying the IPv6 router includes an M flag set to 1 and an O flag set to 1. In response to confirming that the router that has transmitted the NDP RA message is the IPv6 router 135, the dual stack home gateway 130 accesses the DHCPv6 server 170 through the IPv6 router 135 and assigns an IP address according to the IPv6 protocol. are assigned

When the dual stack home gateway 140 transmits the NDP RS message to the dual stack network 150 , a dual stack router located on the same data link as the dual stack home gateway 140 in the dual stack network 150 or Since the IPv6 router does not exist, no response message is received. When the dual-stack home gateway 140 does not receive any response message, it recognizes that there is only an IPv4 router as the router located on the same data link as the dual-stack home gateway 140, and accordingly, the IPv4 router 145 is configured. It accesses the DHCPv4 server 160 through the DHCPv4 server and is assigned an IP address according to the IPv4 protocol.

The dual stack home gateways 120 and 130 may be assigned an IP address according to the IPv6 protocol by performing a procedure for sending and receiving Solicit, Advertise, Request, and Reply messages with the DHCPv6 server 170 . The dual-stack home gateways 120 and 140 may be assigned an IP address according to the IPv4 protocol by performing a procedure for exchanging Discovery, Offer, Request, and Ack messages with the DHCPv4 server 160 . Since the procedure for the dual-stack home gateway to be assigned an IP address is described in detail in 3GPP, a detailed description thereof will be omitted.

2A and 2B are diagrams illustrating an embodiment of a flowchart for explaining a method of controlling assignment of an IP address in a dual-stack home gateway.

As shown, the IP address allocation control method according to the disclosed technology starts from the step S205 of checking whether the dual stack home gateways 120, 130, and 140 are newly booted or a new physical connection to the network is established. do. In one embodiment, the physical connection to the network includes the operation of newly connecting the dual-stack home gateways 120 , 130 , and 140 to a socket for Internet connection. If it is determined in step S205 that the dual stack home gateways 120 , 130 , and 140 have not been newly booted and it is determined that a new physical connection to the network has not been established, the process returns to step S205 . As a result of the determination in step S205, if it is determined that the dual-stack home gateways 120, 130, and 140 have been newly booted or that a physical connection to the network has been newly established, the process proceeds to step S210. In step S210, flash information about the IP version in which the home gateways 120, 130, and 140 were operated before the dual-stack home gateways 120, 130, and 140 were newly booted or a new physical connection to the network was made. It is checked whether the flash information indicates IPv6 or null by referring to (Flash) information. When the flash information indicates IPv6, it may indicate that the dual-stack home gateways 120, 130, and 140 are newly booted or operated in IPv6 mode before a new physical connection to the network is made. When the flash information is Null, since there is no information, it may indicate that the dual stack home gateways 120 , 130 , and 140 are newly opened and operated for the first time. When the flash information indicates IPv4, it may indicate that the dual-stack home gateways 120, 130, and 140 are newly booted or operated in IPv4 mode before a new physical connection to the network is made. If it is determined that the flash information indicates IPv6 or is null as a result of the check in step S210, an NDP RS message is transmitted in step S215. In one embodiment, the NDP RS message is continuously transmitted a predetermined number of times. In step S220, it is checked whether the NDP RA message has been received. If it is determined that the NDP RA message has not been received as a result of the check in step S220, for example, since the dual-stack home gateways 120, 130, and 140 have been installed and moved from the IPv6 network area to the IPv4 network area, the dual-stack home gateway Since there is no dual stack router or IPv6 router located on the same data link as (120, 130, 140), the process proceeds to step S250 to be described later and accesses the DHCPv4 server 160 to obtain an IP address. Follow the procedure to be assigned. On the other hand, if it is determined that the NDP RA message has been received as a result of the check in step S220, a procedure for accessing the DHCPv6 server 170 to be assigned an IP address is performed in step S225. In one embodiment, in order to be assigned an IP address, a procedure for exchanging Solicit, Advertise, Request and Reply messages with the DHCPv6 server 170 is performed. In one embodiment, the dual stack home gateways 120 , 130 , and 140 continuously transmit the Solicit message a predetermined number of times. In step S230, it is checked whether or not it has succeeded in receiving an IP address. If it is determined that the IP address assignment has not been successful as a result of the check in step S230, the DHCPv6 server 170 has a failure, so the process returns to step S225 and connects to the DHCPv6 server 170 to repeat the procedure for receiving an IP address again. On the other hand, if it is determined that the assignment of the IP address is successful as a result of the check in step S230, the process proceeds to step S235 to check whether the flash information is Null. If it is determined that the flash information is not null as a result of the check in step S235, the process proceeds to step S245 to operate the dual stack home gateways 120, 130, and 140 with an IP address according to the IPv6 protocol. On the other hand, if it is determined that the flash information is Null as a result of the check in step S235, the process proceeds to step S240 to update the flash information so that the flash information indicates IPv6, and then proceeds to step S245 to follow the IPv6 protocol. The dual-stack home gateway (120, 130, 140) is operated with an IP address.

On the other hand, if it is determined that the flash information neither indicates IPv6 nor Null as a result of the check in step S210, the flash information indicates IPv4, the process proceeds to step S250 and accesses the DHCPv4 server 160 to perform the procedure to be assigned an IP address. In one embodiment, a procedure for exchanging Discovery, Offer, Request, and Ack messages with the DHCPv4 server 160 is performed in order to be assigned an IP address. In an embodiment, the dual stack home gateways 120 , 130 , and 140 continuously transmit the discovery message a predetermined number of times. In step S255, it is checked whether or not it has succeeded in receiving an IP address. As a result of the check in step S255, if it is determined that the assignment of the IP address has not been successful, the process proceeds to step S260 to transmit an NDP RS message. In one embodiment, the NDP RS message is continuously transmitted a predetermined number of times. In step S265, it is checked whether the NDP RA message has been received. If it is determined that the NDP RA message has not been received as a result of the check in step S265, it is to confirm that the dual stack home gateways 120, 130, 140 are still located in the IPv4 network area and only that a failure has occurred in the DHCPv4 server. , the process returns to step S250 and performs the procedure for accessing the DHCPv4 server 160 to be assigned an IP address again. If it is determined that the NDP RA message has been received as a result of the check in step S265, the process proceeds to step S270 to check whether the router that has transmitted the NDP RA message is an IPv6 router. As a result of the check in step S270, if it is determined that the router that transmitted the NDP RA message is not an IPv6 router but a dual stack router, the process returns to step S250 and accesses the DHCPv4 server 160 to assign an IP address Repeat the procedure for receiving. On the other hand, if it is determined that the router that transmitted the NDP RA message is an IPv6 router as a result of the inspection in step S270, the dual stack home gateways 120, 130, 140 are installed after being moved from the IPv4 network area to the IPv6 network area. The process proceeds to step S225 to access the DHCPv6 server 170 and perform a procedure for receiving an IP address according to the IPv6 protocol. On the other hand, if it is determined that the assignment of the IP address is successful as a result of the check in step S255, the process proceeds to step S275 to check whether the flash information is Null. If it is determined that the flash information is not null as a result of the check in step S275, the process proceeds to step S285 to operate the dual stack home gateways 120, 130, and 140 with an IP address according to the IPv4 protocol. On the other hand, if it is determined that the flash information is Null as a result of the check in step S275, the process proceeds to step S280 to update the flash information so that the flash information indicates IPv4, and then proceeds to step S285 to comply with the IPv4 protocol. The dual-stack home gateway (120, 130, 140) is operated with an IP address.

In this way, when the dual stack home gateways 120, 130, 140 were previously operated in IPv6 mode or newly opened and operated for the first time, and when installed after being moved from an IPv4 network area to an IPv6 network area, an IP address according to the IPv6 protocol is assigned. By controlling the reception, it is possible to prevent premature exhaustion of IP addresses according to the IPv4 protocol.

In the above description, the meaning of the description that a component is connected to or coupled to another component not only means that the component is directly connected or coupled to the other component, but also means that one or more other components are interposed therebetween. It should be understood to include the meaning that may be connected or coupled via an element. In addition, terms for describing the relationship between the elements (eg, 'between', 'between', etc.) should also be interpreted with similar meanings.

In the embodiments disclosed herein, the arrangement of the illustrated components may vary depending on the environment or requirements in which the invention is implemented. For example, some components may be omitted or some components may be integrated and implemented as one. Also, the arrangement order and connection of some components may be changed.

In the above, various embodiments of the present invention have been shown and described, but the present invention is not limited to the specific embodiments described above, and the above-described embodiments depart from the gist of the present invention as claimed in the appended claims. Without this, various modifications may be made by those of ordinary skill in the art to which the present invention pertains, and these modified embodiments should not be understood separately from the technical spirit or scope of the present invention. Accordingly, the technical scope of the present invention should be defined only by the appended claims.

120, 130, 140: IPv4/IPv6 dual stack home gateway
122: PC
124: IPTV STB
126: smartphone
128: notebook
125: IPv4/IPv6 Dual Stack Router
135: IPv6 router
145: IPv4 router
150: IPv4/IPv6 dual stack network
160: DHCPv4 server
165: IPv4 router
170: DHCPv6 Server
175: IPv6 router

Claims (18)

As a method of controlling the assignment of an IP address from a dual stack home gateway (HGW),
Transmitting a Neighbor Discovery Protocol (NDP) Route Solicitation (RS) message when the flash information indicates Internet Protocol version 6 (IPv6) or is null - The flash information is information about the IP version in which the home gateway was previously operated Im -, and
and performing a procedure for receiving an IP address according to an IPv6 protocol when receiving an NDP Router Advertisement (RA) message in response to the transmission of the NDP RS message.
According to claim 1,
and the method is executed in response to a new boot of the dual stack home gateway or a new physical connection to the network.
According to claim 1,
When the flash information is Null, the method for controlling IP address allocation is when the dual-stack home gateway is newly opened.
According to claim 1,
Transmitting a Neighbor Discovery Protocol (NDP) Route Solicitation (RS) message when the flash information indicates Internet Protocol version 6 (IPv6) or null is information, which includes continuously transmitting the NDP RS message a predetermined number of times.
According to claim 1,
and repeating the transmission of the NDP RS message when the NDP RA message is not received in response to the transmission of the NDP RS message.
According to claim 1,
When an NDP RA (Router Advertisement) message is received in response to the transmission of the NDP RS message, the step of performing a procedure for receiving an IP address according to the IPv6 protocol is performed by connecting to a DHCPv6 (Dynamic Host Configuration Protocol Version 6) server and A method of controlling IP address allocation, comprising the step of performing a procedure for sending and receiving messages.
7. The method of claim 6,
The step of performing a procedure for exchanging messages by connecting with the DHCPv6 (Dynamic Host Configuration Protocol Version 6) server includes continuously transmitting a solicit message to the DHCPv6 server a predetermined number of times, IP address allocation control method .
According to claim 1,
checking whether the flash information is null when the dual-stack home gateway succeeds in being assigned an IP address according to the IPv6 protocol;
operating the dual-stack home gateway with the IP address according to the IPv6 protocol when the flash information is not null; and
If the flash information is null, updating the flash information so that the flash information indicates IPv6 and operating the dual stack home gateway with the IP address according to the IPv6 protocol.
A method for controlling assignment of an IP address in a dual-stack home gateway, comprising:
When the flash information indicates IPv4 (Internet Protocol version 4), performing a procedure for receiving an IP address according to the IPv4 protocol - The flash information is information about the IP version in which the home gateway was previously operated -,
transmitting an NDP RS message when the dual-stack home gateway does not succeed in being assigned an IP address according to the IPv4 protocol; and
Receiving the NDP RA message in response to the transmission of the NDP RS message and performing a procedure for receiving an IP address according to the IPv6 protocol in response to confirming that the router that transmitted the NDP RA message is an IPv6 router How to control IP address allocation.
10. The method of claim 9,
and the method is executed in response to a new boot of the dual stack home gateway or a new physical connection to the network.
10. The method of claim 9,
If the flash information indicates IPv4 (Internet Protocol version 4), performing a procedure for receiving an IP address according to the IPv4 protocol - The flash information is information about the IP version in which the home gateway was previously operated - , IP address allocation control method comprising the step of performing a procedure for sending and receiving messages in connection with a DHCPv4 (Dynamic Host Configuration Protocol Version 4) server.
12. The method of claim 11,
The step of performing a procedure for exchanging messages by connecting to the DHCPv4 (Dynamic Host Configuration Protocol Version 4) server includes continuously transmitting a discovery message to the DHCPv4 server a predetermined number of times, IP address allocation control method .
10. The method of claim 9,
When the dual-stack home gateway does not succeed in receiving the IP address according to the IPv4 protocol, the step of transmitting the NDP RS message includes continuously transmitting the NDP RS message a predetermined number of times, the IP address Allocation control method.
10. The method of claim 9,
Receiving the NDP RA message in response to the transmission of the NDP RS message and performing a procedure for receiving an IP address according to the IPv6 protocol in response to confirming that the router that transmitted the NDP RA message is an IPv6 router includes: A method of controlling IP address assignment, comprising the step of performing a procedure for sending and receiving messages by accessing a DHCPv6 server.
15. The method of claim 14,
The step of connecting with the DHCPv6 server and performing a procedure for exchanging messages includes continuously transmitting a solicit message to the DHCPv6 server a predetermined number of times.
10. The method of claim 9,
Receiving the NDP RA message in response to the transmission of the NDP RS message and performing a procedure for receiving an IP address according to the IPv6 protocol in response to confirming that the router that transmitted the NDP RA message is an IPv6 router includes: and confirming that the router transmitting the NDP RA message is an IPv6 router by referring to the M flag and the O flag included in the NDP RA message.
A computer-readable recording medium recording a program, the program including instructions, which, when executed by a computer, perform the method according to any one of claims 1 to 8. .
A computer-readable recording medium recording a program, the program including instructions, which, when executed by a computer, perform the method according to any one of claims 9 to 16. .

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