KR102102665B1 - Apparatus and method for allocating internet protocol address in communication system supporting dynamic host configuration protocol - Google Patents

Abstract

The present invention provides a method in which a communication device is assigned an Internet Protocol (IP) address in a communication system supporting Dynamic Host Configuration Protocol (DHCP), the interface included in the communication device creating a virtual bridge interface including interfaces, and setting a media access control (MAC) address of the virtual bridge interface to one of the interfaces, And assigning an IP address for the communication device using the MAC address of the virtual bridge interface.

Description

A device and method for allocating Internet protocol addresses in a communication system supporting a dynamic host configuration protocol {APPARATUS AND METHOD FOR ALLOCATING INTERNET PROTOCOL ADDRESS IN COMMUNICATION SYSTEM SUPPORTING DYNAMIC HOST CONFIGURATION PROTOCOL}

The present invention relates to an apparatus and method for allocating an address of an Internet protocol (IP) in a communication system, and in particular, a dynamic host configuration protocol (DHCP, hereinafter) DHCP ') and a communication system supporting the same IP address.

There are various methods for allocating an IP address to a communication device, and one of them is a method using DHCP. Then, a method of allocating an IP address to the communication device using the DHCP will be described as follows.

First, in DHCP, a communication device transmits a media access control (MAC, hereinafter referred to as 'MAC') address of the communication device itself to a DHCP server, and requests IP address allocation.

Then, the DHCP server receives the MAC address of the communication device, and uses the MAC address of the communication device to check whether the DHCP server itself has ever assigned an IP address to a communication device using the MAC address. .

As a result of the inspection, if the DHCP server itself has assigned an IP address to a communication device using the MAC address, the DHCP server determines whether the IP address that has been assigned to a communication device using the MAC address is currently in use. Check. If the IP address is not currently being used as a result of the check, the DHCP server assigns the corresponding IP address to the communication device using the MAC address.

Alternatively, as a result of the inspection, the DHCP server itself has never assigned an IP address to a communication device using the MAC address, and the DHCP server itself has also assigned an IP address to a communication device using the MAC address. Even if the IP address is not currently in use, the DHCP server assigns a new IP address to the communication device using the MAC address.

On the other hand, in recent years, various communication devices, such as smart phones (smart phones), laptops (laptop) Personal Computer (PC, hereinafter referred to as 'PC'), and various communication devices such as smart home appliances As a wireless communication method, for example, a wireless communication method such as a Wi-Fi (Wireless-Fidelity: Wi-Fi, hereinafter referred to as 'Wi-Fi') method is installed, the various communication devices are wired in the past. In addition to the communication interface, a wireless communication interface is simultaneously provided.

As an example, a laptop PC often includes an Ethernet (hereinafter referred to as 'Ethernet') interface and a Wi-Fi interface, and a smart phone has an Ethernet interface, a Wi-Fi interface, and Wi-Fi Direct. (Direct, hereinafter referred to as 'Direct') It includes a number of communication interfaces such as interfaces. In addition to the laptop PC and smart phone, various communication devices include multiple communication interfaces.

Meanwhile, when a plurality of communication interfaces are included in one communication device, an IP address allocated to the communication device is changed according to which interface the communication device uses. For example, the IP address assigned when the corresponding communication device communicates over the wire using the Ethernet method and the IP address assigned when the corresponding communication device communicates wirelessly using the Wi-Fi method are different.

Meanwhile, each communication interface uses a unique MAC address. Next, referring to FIG. 1, MAC addresses allocated to a communication device in a general communication system will be described.

1 is a diagram schematically showing MAC addresses assigned to a communication device in a general communication system.

Referring to FIG. 1, the communication device 100 includes a total of three communication interfaces, that is, an Ethernet interface 111, a Wi-Fi interface 113, and a Wi-Fi Direct interface 115.

The communication device 100 uses the same number of MAC addresses as the number of interfaces included in the communication device 100 itself. That is, the Ethernet interface 111 uses MAC addresses 5E: 67: EF: EE: 7F: FF, and the Wi-Fi interface 113 uses MAC addresses 5E: 67: E9: EE: 7F: FF. And, the Wi-Fi Direct interface 115 uses MAC addresses 5E: 67: E9: EE: 7F: 0F.

Meanwhile, as described above, in the DHCP, an IP address is assigned to a communication device based on a MAC address, and thus, when the MAC address is changed, the IP address assigned to the communication device may be changed.

On the other hand, since the MAC address used for each communication interface is different, the IP address used in the communication device varies depending on which communication interface the communication device uses.

Accordingly, unnecessary and cumbersome procedures may be generated by using multiple IP addresses in a communication device using multiple interfaces.

One embodiment of the present invention proposes an apparatus and method for allocating IP addresses in a communication system.

In addition, an embodiment of the present invention proposes an apparatus and method for allocating the same IP address in a communication system supporting DHCP.

Method proposed in an embodiment of the present invention; In a communication system supporting a Dynamic Host Configuration Protocol (DHCP), a communication device is assigned an Internet Protocol (IP) address, and an interface included in the communication device A process of generating a virtual bridge interface including, a process of setting a media access control (MAC) address of the virtual bridge interface to any one of the interfaces, and the virtual And assigning an IP address for the communication device using the MAC address of the bridge interface.

The apparatus proposed in one embodiment of the present invention; A communication device of a communication system supporting Dynamic Host Configuration Protocol (DHCP), the communication device includes a virtual bridge interface including interfaces included in the communication device, and the virtual bridge A controller that sets a Media Access Control (MAC) address of an interface to a MAC address of any one of the interfaces, and an Internet protocol for the communication device using the MAC address of the virtual bridge interface ( Internet Protocol (IP) is characterized by including a receiver that is assigned an address.

One embodiment of the present invention has the effect of enabling a communication device to be assigned the same IP address even if it uses multiple interfaces.

In addition, according to an embodiment of the present invention, when an IP address is dynamically assigned to a communication device using DHCP, the same IP address can be used even if an interface used by the communication device is changed. In this way, in one embodiment of the present invention, since it is possible to use various interfaces using the same IP address, when executing an application, it can be recognized that the same communication device is logically used even if the physical interface is changed. It works for that. That is, since the application can perform communication using only one IP address even when the interface used by the communication device is changed, there is an effect that the application session can be continuously maintained, especially when the application is running.

1 is a diagram schematically showing MAC addresses assigned to a communication device in a general communication system.
2 is a diagram schematically showing an example of an interface structure of a communication device in a communication system according to an embodiment of the present invention
3 schematically illustrates the encapsulation function of a virtual bridge interface used in a communication device of a communication system according to an embodiment of the present invention
4 is a diagram schematically showing another example of an interface structure of a communication device in a communication system according to an embodiment of the present invention
5 is a flowchart illustrating a process of generating a virtual bridge interface of a communication device in a communication system according to an embodiment of the present invention
6 schematically illustrates a process of deleting an interface included in a virtual bridge interface of a communication device in a communication system according to an embodiment of the present invention
7 is a diagram schematically showing a process of adding an interface included in a virtual bridge interface of a communication device in a communication system according to an embodiment of the present invention with reference to FIG.
8 is a diagram schematically showing a process in which a communication device deletes a virtual dummy interface in a communication system according to an embodiment of the present invention.
9 schematically illustrates a process in which a communication device maintains a virtual dummy interface in a communication system according to an embodiment of the present invention
10 is a diagram schematically showing an operation process of a communication device when a virtual dummy interface uses the same MAC address as the Ethernet interface in the communication system according to an embodiment of the present invention.
11 schematically illustrates an operation process of a communication device when a virtual dummy interface uses a MAC address of a Wi-Fi interface or a MAC address of a Wi-Fi Direct interface in a communication system according to an embodiment of the present invention. Drawings shown
12 is a view schematically showing the internal structure of a communication device in a communication system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, it should be noted that only the parts necessary to understand the operation according to the embodiments of the present invention will be described below, and descriptions of other parts will be omitted so as not to distract the subject matter of the present invention. In addition, terms to be described later are terms defined in consideration of functions in embodiments of the present invention, which may vary according to a user's or operator's intention or practice. Therefore, the definition should be made based on the contents throughout this specification.

The present invention can be applied to various changes and can have various embodiments, and specific embodiments will be described in detail with reference to the drawings. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Further, terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from other components. For example, the first component may be referred to as a second component without departing from the scope of the present invention, and similarly, the second component may be referred to as a first component. The term and / or includes a combination of a plurality of related described items or any one of a plurality of related described items.

In addition, the terms used herein are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “include” or “have” are intended to indicate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, and that one or more other features are present. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

In addition, in the embodiments of the present invention, unless otherwise defined, all terms used herein, including technical or scientific terms, are generally understood by those skilled in the art to which the present invention pertains. It has the same meaning as that. Terms, such as those defined in a commonly used dictionary, should be interpreted as having meanings consistent with meanings in the context of related technologies, and are ideally or excessively formal meanings unless explicitly defined in the embodiments of the present invention. Is not interpreted as

One embodiment of the present invention proposes an apparatus and method for allocating an Internet Protocol (IP) address in a communication system.

In addition, an embodiment of the present invention proposes an apparatus and method for allocating the same IP address in a communication system supporting dynamic host configuration protocol (DHCP, hereinafter referred to as "DHCP").

Meanwhile, an apparatus and method for allocating the same IP address in a communication system supporting DHCP, proposed in an embodiment of the present invention, is a Long Term Evolution (LTE) hereinafter referred to as 'LTE'. Communication system, Long Term Evolution-Advanced (LTE-A: Long-Term Evolution-Advanced, hereinafter referred to as 'LTE-A') Mobile communication system, high-speed downlink packet access (HSDPA) , High-speed uplink packet access (HSUPA, hereinafter referred to as 'HSUPA') mobile communication system, 3G project partnership 2 (3rd generation project partnership 2: 3GPP2, hereinafter referred to as '3GPP2' high rate packet data (high rate packet data: HRPD, hereinafter referred to as 'HRPD') mobile communication system, 3GPP2 broadband Call division multiple access (WCDMA: Wideband Code Division Multiple Access, hereinafter referred to as 'WCDMA') Mobile communication system and 3GPP2 code division multiple access (CDMA: Code Division Multiple Access, hereinafter referred to as 'CDMA') Mobile communication system, International Institute of Electrical and Electronics Engineers (IEEE) hereinafter referred to as 'IEEE' 802.16m communication system, and evolved packet system (EPS: Evolved Packet System, hereinafter 'EPS') And Mobile Internet Protocol (Mobile Internet Protocol: Mobile IP, hereinafter referred to as 'Mobile IP'), applied to various communication systems such as IEEE 802.11 system, IEEE 802.3 system, Wi-Fi system, etc. It is possible.

Hereinafter, in one embodiment of the present invention, two types of virtual interfaces are used. Here, the virtual interfaces include a virtual bridge interface and a virtual dummy interface. The virtual bridge interface is used for the purpose of fixing the interface on which DHCP is operated. Also, the virtual dummy interface is used to fix the medium access control (MAC) address of the virtual bridge interface.

Then, an example of an interface structure of a communication device in a communication system according to an embodiment of the present invention will be described with reference to FIG. 2 herein.

2 is a diagram schematically showing an example of an interface structure of a communication device in a communication system according to an embodiment of the present invention.

Referring to FIG. 2, the communication device 200 includes a virtual bridge interface 211 that is a virtual interface, and a plurality of interfaces, for example, three interfaces, namely Ethernet. , 'Ethernet') Interface (213), Wi-Fi (Wireless-Fidelity: Wi-Fi, hereinafter referred to as 'Wi-Fi') Interface 215, and Wi-Fi Direct (Direct, hereinafter, referred to as 'Direct') Interface 217 is included.

The virtual bridge interface 211 is a representative interface to which an IP address is assigned. That is, even if the communication device 200 includes multiple interfaces, only one IP address is assigned to the communication device 200, and this one IP address is assigned to the virtual bridge interface 211. .

On the other hand, in general, DHCP is actually operated on an interface in an active state to be used for communication. Accordingly, when the interface used for communication of the communication device 200 is changed, the interface on which DHCP is operated is also changed, and the MAC address is also changed, so that the IP address can be changed.

However, in one embodiment of the present invention, even if the communication device 200 includes multiple interfaces, one IP address is assigned to the virtual bridge interface 211.

In FIG. 2, an example of an interface structure of a communication device in a communication system according to an embodiment of the present invention has been described. Next, with reference to FIG. 3, it is used in a communication device of a communication system according to an embodiment of the present invention. It is a diagram schematically showing the encapsulation function of the virtual bridge interface.

3 is a diagram schematically showing an encapsulation function of a virtual bridge interface used in a communication device of a communication system according to an embodiment of the present invention.

Referring to FIG. 3, the virtual bridge interface 311 performs an encapsulation function including functions of conventional communication interfaces. Accordingly, the virtual bridge interface 311 may perform functions of conventional communication interfaces, that is, the Ethernet interface 313, the Wi-Fi interface 315, and the Wi-Fi Direct interface 317, respectively.

Therefore, when the communication device 300 communicates using the Ethernet interface 313, the Wi-Fi interface 315, and the Wi-Fi Direct interface 317, respectively, the Ethernet interface 313, Each of the Wi-Fi interface 315 and the Wi-Fi Direct interface 317 may perform a corresponding interface operation through the virtual bridge interface 311. That is, DHCP is operated on the virtual bridge interface 311.

In conclusion, when communication is to be performed through the Ethernet interface 313, signals input to the Ethernet interface 313 or output from the Ethernet interface 313 are encapsulated in the virtual bridge interface 311. It is either mediated or de-capsulated.

In addition, when communication is to be performed through the Wi-Fi interface 315, a signal input to the Wi-Fi interface 315 or output from the Wi-Fi interface 315 may include the virtual bridge interface ( In 311), it is encapsulated or decapsulated.

In addition, when communication is to be performed through the Wi-Fi Direct interface 317, a signal input to the Wi-Fi Direct interface 317 or output from the Wi-Fi Direct interface 317 is the virtual It is encapsulated or decapsulated at the bridge interface 311.

3 illustrates the encapsulation function of interfaces used in a communication device of a communication system according to an embodiment of the present invention. Next, a communication device in a communication system according to an embodiment of the present invention is described with reference to FIG. Another example of the interface structure of the will be described.

4 is a diagram schematically showing another example of an interface structure of a communication device in a communication system according to an embodiment of the present invention.

Referring to FIG. 4, the communication device 400 includes a virtual bridge interface 411 which is a virtual interface, a virtual dummy interface 413, and a plurality of interfaces, for example, two interfaces, namely Wi- Fi interface 415 and Ethernet interface 417 are included. Here, the virtual dummy interface 413 operates as one of the interfaces included in the virtual bridge interface 411 even if it is a virtual interface.

The virtual bridge interface 411 is a representative interface to which an IP address is assigned. That is, even if the communication device 400 includes multiple interfaces, only one IP address is assigned to the communication device 400, and this one IP address is assigned to the virtual bridge interface 411. .

The virtual bridge interface 411 copies the MAC addresses of one of the interfaces operating through the virtual bridge interface 411, that is, the Wi-Fi interface 415 and the Ethernet interface 417, and the virtual bridge interface. (411) It is used as its own MAC address. The reason why the virtual bridge interface 411 uses the MAC address of one of the interfaces operating through the virtual bridge interface 411 itself as the MAC address of the virtual bridge interface 411 is to fix the IP address. , And the virtual bridge interface 411 uses the same MAC address.

The virtual bridge interface 411 may copy a MAC address from interfaces operating through the virtual bridge interface 411, for example, a MAC address assigned to interfaces operating through the virtual bridge interface 411. Among them, the MAC address having the smallest address is copied and used as the MAC address of the most bridge interface 411 itself. For example, it is assumed that the virtual bridge interface 411 uses the MAC address of the virtual dummy interface 413 as the MAC address of the virtual bridge interface 411.

The virtual dummy interface 413 is inactive and is located under the virtual bridge interface 411. The virtual dummy interface 413 also copies one MAC address of the Wi-Fi interface 415 and the Ethernet interface 417 to use as the MAC address of the virtual dummy interface 413 itself.

Although the communication device 400 includes multiple interfaces as described in FIG. 4, one IP address is assigned to the virtual bridge interface 411.

4 illustrates another example of an interface structure of a communication device in a communication system according to an embodiment of the present invention. Next, a virtual bridge of a communication device in a communication system according to an embodiment of the present invention is described with reference to FIG. The interface creation process will be described.

5 is a flowchart illustrating a process of generating a virtual bridge interface of a communication device in a communication system according to an embodiment of the present invention.

Referring to FIG. 5, first, in step 511, the communication device generates a virtual bridge module and proceeds to step 513. Here, the virtual bridge module is configured as, for example, a Linux (RENUX) kernel module. In step 513, the communication device kills a DHCP process in order to use the same IP address in the communication device, and then proceeds to step 515.

In step 515, the communication device raises the virtual bridge module to generate a virtual bridge interface and proceeds to step 517. In step 517, the communication device restarts the DHCP process.

Meanwhile, although FIG. 5 illustrates an example of a process of generating a virtual bridge interface of a communication device in a communication system according to an embodiment of the present invention, various modifications can be made to FIG. 5. For example, although successive steps are illustrated in FIG. 5, the steps described in FIG. 5 may overlap, may occur in parallel, may occur in a different order, or may occur multiple times.

In FIG. 5, a process of generating a virtual bridge interface of a communication device in a communication system according to an embodiment of the present invention has been described. Next, a communication device in a communication system according to an embodiment of the present invention will be described with reference to FIGS. 6 and 7. The interface replacement process included in the virtual bridge interface will be described.

6 is a diagram schematically showing a process of deleting an interface included in a virtual bridge interface of a communication device in a communication system according to an embodiment of the present invention.

6, first, in step 611, if the communication system detects that the interfaces included in the virtual bridge interface should be deleted, the process proceeds to step 613. In step 613, the communication system selects at least one interface to be deleted among the interfaces included in the virtual bridge interface and proceeds to step 615.

In step 615, the communication system deletes the selected at least one interface from an interface included in the virtual bridge interface.

Meanwhile, although FIG. 6 shows an example of a process of deleting an interface included in a virtual bridge interface of a communication device in a communication system according to an embodiment of the present invention, various modifications can be made to FIG. 6. to be. For example, although successive steps are illustrated in FIG. 6, the steps described in FIG. 6 may overlap, may occur in parallel, may occur in a different order, or may occur multiple times.

In FIG. 6, a process of deleting an interface included in a virtual bridge interface of a communication device in a communication system according to an embodiment of the present invention has been described. Next, a communication system according to an embodiment of the present invention will be described with reference to FIG. 7. In the description, the process of adding an interface included in the virtual bridge interface of the communication device will be described.

7 is a diagram schematically showing a process of adding an interface included in a virtual bridge interface of a communication device in a communication system according to an embodiment of the present invention with reference to FIG.

Referring to FIG. 7, first, in step 711, when it is detected that the interfaces included in the virtual bridge interface should be added, the process proceeds to step 713. In step 713, the communication system selects an interface for at least one interface to be added and proceeds to step 715.

In step 715, the communication system includes the selected at least one interface in the virtual bridge interface.

Meanwhile, although FIG. 7 shows an example of a process of adding an interface included in a virtual bridge interface of a communication device in a communication system according to an embodiment of the present invention, various modifications can be made to FIG. 7. to be. As an example, although successive steps are shown in FIG. 7, the steps described in FIG. 7 may overlap, may occur in parallel, may occur in a different order, or may occur multiple times.

6 and 7, interfaces included in the virtual bridge interface may be deleted or new interfaces may be added in the virtual bridge interface. That is, interfaces used for actual communication may be added or deleted to the virtual bridge interface without any limitation, and in the case of the virtual dummy interface, may be continuously included in the virtual bridge interface or deleted from the virtual bridge interface.

Next, a process of deleting a virtual dummy interface by a communication device in a communication system according to an embodiment of the present invention will be described with reference to FIG. 8.

8 is a diagram schematically illustrating a process in which a communication device deletes a virtual dummy interface in a communication system according to an embodiment of the present invention.

Referring to FIG. 8, first, in step 811, if the communication device detects that the virtual dummy interface should be deleted, the process proceeds to step 813. Here, a case in which the communication device detects that the virtual dummy interface should be deleted is as follows.

First, the virtual dummy interface copies a MAC address of one of the interfaces included in the communication device and uses it as the MAC address of the virtual dummy interface. Therefore, the communication interface includes two interfaces using the same MAC address. However, when both interfaces using the same MAC address are included in the virtual bridge interface, the virtual bridge interface transmits / receives a data packet to be transmitted / received using a corresponding MAC address using a certain interface. It is impossible to tell if it will be. Accordingly, when an interface using the same MAC address as the virtual dummy interface is included in the virtual bridge interface, the communication device detects that the virtual dummy interface should be deleted from the virtual bridge interface.

In step 813, the communication device selects an interface to be deleted from the virtual bridge interface, that is, a virtual dummy interface, and proceeds to step 815. In step 815, the communication device deletes the virtual dummy interface from the virtual bridge interface.

Meanwhile, although FIG. 8 shows an example of a process in which a communication device deletes a virtual dummy interface in a communication system according to an embodiment of the present invention, various modifications can be made to FIG. 8. For example, although successive steps are illustrated in FIG. 8, the steps described in FIG. 8 may overlap, may occur in parallel, may occur in a different order, or may occur multiple times.

8 illustrates a process in which a communication device deletes a virtual dummy interface in a communication system according to an embodiment of the present invention. Next, a communication device in a communication system according to an embodiment of the present invention is described with reference to FIG. The process of maintaining the virtual dummy interface will be described.

9 is a diagram schematically illustrating a process in which a communication device maintains a virtual dummy interface in a communication system according to an embodiment of the present invention.

Referring to FIG. 9, first, in step 911, the communication device detects that there are interfaces using the same MAC address, and then proceeds to step 913. In step 913, the communication device determines whether to maintain the virtual dummy interface and proceeds to step 915. Here, the operation for determining whether the communication device should maintain the virtual dummy interface is as follows.

First, the virtual dummy interface copies a MAC address of one of the interfaces included in the communication device and uses it as the MAC address of the virtual dummy interface. Therefore, the communication interface includes two interfaces using the same MAC address. However, when both interfaces using the same MAC address are included in the virtual bridge interface, the virtual bridge interface distinguishes which interface the data packet to be transmitted / received is transmitted / received using the corresponding MAC address. impossible. Therefore, when an interface using the same MAC address as the virtual dummy interface is included in the virtual bridge interface, the communication device checks whether the virtual dummy interface is in an inactive state. As a result of the inspection, when the virtual dummy interface is in an inactive state, it is detected that the virtual dummy interface should be maintained in the virtual bridge interface. In one embodiment of the present invention, since the virtual dummy interface is inactive, the communication device determines that the virtual dummy interface is maintained in the virtual bridge interface.

In step 915, the communication device maintains the virtual dummy interface in the virtual bridge interface according to whether the virtual dummy interface is maintained.

Meanwhile, although FIG. 9 illustrates an example of a process in which a communication device maintains a virtual dummy interface in a communication system according to an embodiment of the present invention, various modifications can be made to FIG. 9. As an example, although successive steps are illustrated in FIG. 9, the steps described in FIG. 9 may overlap, may occur in parallel, may occur in different orders, or may occur multiple times.

9 illustrates a process in which a communication device maintains a virtual dummy interface in a communication system according to an embodiment of the present invention. Next, a virtual dummy interface in a communication system according to an embodiment of the present invention is described with reference to FIG. A description will be given of the operation process of the communication device when using the same MAC address as the MAC address of the Ethernet interface.

10 is a diagram schematically showing an operation process of a communication device when a virtual dummy interface uses the same MAC address as the Ethernet interface in the communication system according to an embodiment of the present invention.

Referring to FIG. 10, first, in step 1011, the communication device checks whether the MAC address of the virtual dummy interface is the same as the MAC address of the Ethernet interface. As a result of the inspection, when the MAC address of the virtual dummy interface is the same as the MAC address of the Ethernet interface, the communication device proceeds to step 1013. In step 1013, the communication device transitions the operation mode of the Ethernet interface to a Promiscuous (hereinafter referred to as “Promiscuous”) mode. Here, it is needless to say that step 1013 may be omitted when the Ethernet interface is already operating in the Promiscuous mode.

In this way, as the operation mode of the Ethernet interface transitions to the Promiscuous mode, the Ethernet interface can transmit / receive data packets having a MAC address different from that of the Ethernet interface itself.

Meanwhile, although FIG. 10 shows an example of an operation process of a communication device when the virtual dummy interface uses the same MAC address as the Ethernet interface MAC address in the communication system according to an embodiment of the present invention, various modifications are shown. Of course it can be done for 10. For example, although successive steps are illustrated in FIG. 10, the steps described in FIG. 10 may overlap, may occur in parallel, may occur in a different order, or may occur multiple times.

In FIG. 10, an operation process of a communication device when a virtual dummy interface uses the same MAC address as the Ethernet interface MAC address in the communication system according to an embodiment of the present invention has been described. Next, the present invention will be described with reference to FIG. In the communication system according to an embodiment of the present disclosure, an operation process of a communication device when the virtual dummy interface uses the MAC address of the Wi-Fi interface or the MAC address of the Wi-Fi Direct interface will be described.

11 schematically illustrates an operation process of a communication device when a virtual dummy interface uses a MAC address of a Wi-Fi interface or a MAC address of a Wi-Fi Direct interface in a communication system according to an embodiment of the present invention. It is a drawing shown.

Referring to FIG. 11, first, in step 1111, the communication device checks whether the MAC address of the virtual dummy interface is the same as the MAC address of the Wi-Fi interface or the MAC address of the Wi-Fi Direct interface. As a result of the inspection, if the MAC address of the virtual dummy interface is the same as the MAC address of the Wi-Fi interface or the MAC address of the Wi-Fi Direct interface, the communication device proceeds to step 1113. In step 1113, the communication device changes the MAC address of the Wi-Fi interface or Wi-Fi Direct interface through the virtual bridge interface in order to use the Wi-Fi interface or Wi-Fi Direct interface.

Meanwhile, FIG. 11 illustrates an operation process of a communication device when a virtual dummy interface uses a MAC address of a Wi-Fi interface or a MAC address of a Wi-Fi Direct interface in the communication system according to an embodiment of the present invention. Although an example is shown, it goes without saying that various modifications can be made to FIG. 11. As an example, although successive steps are illustrated in FIG. 11, the steps described in FIG. 11 may overlap, may occur in parallel, may occur in a different order, or may occur multiple times.

11 illustrates an operation process of a communication device when a virtual dummy interface uses a MAC address of a Wi-Fi interface or a MAC address of a Wi-Fi Direct interface in the communication system according to an embodiment of the present invention. Next, an internal structure of a communication device in a communication system according to an embodiment of the present invention will be described with reference to FIG. 12.

12 is a diagram schematically showing the internal structure of a communication device in a communication system according to an embodiment of the present invention.

Referring to FIG. 12, the communication device 1200 includes a receiver 1211, a controller 1213, a storage unit 1215, and a transmitter 1217.

The controller 1213 controls the overall operation of the communication device 1200 and controls to perform operations related to the virtual bridge interface and interface operation. Since the operations related to the virtual bridge interface and the interface operation performed by the communication device 1200 are the same as those described with reference to FIGS. 2 to 11, detailed description thereof will be omitted here.

The receiver 1211 receives various messages and the like under the control of the controller 1213.

The storage unit 1215 stores various messages received by the receiver 1211 and various data necessary for the operation of the communication device 1200.

The transmitter 1217 transmits various messages and the like under the control of the controller 1213.

Meanwhile, FIG. 12 illustrates a case where the communication device 1200 is implemented by the receiver 1211, the controller 1213, the storage unit 1215, and the transmitter 1217 as separate units. Of course, the MAG 1200 may be implemented as one unit in which the receiver 1211, the controller 1213, the storage unit 1215, and the transmitter 1217 are integrated and implemented.

In addition, although not separately illustrated in FIG. 12, a virtual bridge interface, a virtual dummy interface, an Ethernet interface, a Wi-Fi interface, and a Wi-Fi Direct interface may operate as the receiver 1211, and the transmitter ( 1217) can also operate as a plane.

On the other hand, although not shown separately, by managing the virtual bridge interface and interfaces in the same manner as described above, the DHCP server (server) is able to allocate one IP address for one communication device.

It will also be appreciated that an apparatus and method for allocating the same IP address in a communication system supporting DHCP according to an embodiment of the present invention can be realized in the form of hardware, software, or a combination of hardware and software. Any such software may be, for example, volatile or non-volatile storage, such as a storage device such as a ROM, or memory, such as a RAM, memory chip, device or integrated circuit, regardless of whether it is erasable or rewritable. Alternatively, it may be stored in a storage medium readable by a machine (eg, a computer) while being optically or magnetically recordable, for example, a CD, DVD, magnetic disk, or magnetic tape. An apparatus and method for allocating the same IP address in a communication system supporting DHCP according to an embodiment of the present invention may be implemented by a computer or a portable terminal including a controller and a memory, and the memory is an embodiment of the present invention It will be appreciated that it is an example of a machine readable storage medium suitable for storing a program or programs comprising instructions for implementing them.

Accordingly, the present invention includes a program comprising code for implementing the apparatus or method described in any claim of the present specification and a storage medium readable by a machine (computer, etc.) storing the program. In addition, these programs can be transferred electronically through any medium, such as communication signals, transmitted over a wired or wireless connection, and the present invention suitably includes this equivalent.

On the other hand, in the detailed description of the present invention, although specific embodiments have been described, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the claims to be described later, but also by the scope and equivalents of the claims.

Claims (18)

In the communication method by a communication device in a communication system that supports the Dynamic Host Configuration Protocol (Dynamic Host Configuration Protocol: DHCP),
Creating a virtual bridge interface including a plurality of interfaces having different Media Access Control (MAC) addresses;
Setting the MAC address of the virtual bridge interface to the MAC address of the first interface among the plurality of interfaces;
Receiving an Internet Protocol (IP) address for the communication device from a DHCP server using the MAC address of the virtual bridge interface;
Changing the MAC address of the data packet having the assigned IP address to the MAC address of the second interface among the plurality of interfaces, and
And transmitting the data packet including the changed MAC address through the second interface.
According to claim 1,
The virtual bridge interface is an interface that performs encapsulation / de-capsulation functions for the plurality of interfaces.
According to claim 1,
The MAC address of the virtual bridge interface is characterized in that the smallest MAC address of the MAC address of each of the plurality of interfaces.
According to claim 1,
Further comprising the process of creating a virtual dummy (virtual dummy interface) interface,
The virtual dummy interface is included in the virtual bridge interface,
The MAC address of the virtual bridge interface is characterized in that the same as the MAC address of the virtual dummy interface.
According to claim 4,
If there is an interface using the same MAC address as the MAC address of the virtual dummy interface among a plurality of interfaces included in the virtual bridge interface, deleting the virtual dummy interface from a plurality of interfaces included in the virtual bridge interface A method characterized by further comprising a process.
According to claim 4,
Among the interfaces included in the virtual bridge interface, if there is an interface using the same MAC address as the MAC address of the virtual dummy interface, and the state of the virtual dummy interface is inactive, the virtual dummy interface is used. Method characterized in that it further comprises the process of maintaining.
The method according to any one of claims 5 and 6,
When the virtual dummy interface uses the same MAC address as the MAC address of a specific interface among a plurality of interfaces included in the virtual bridge interface, a process of transitioning the mode of the specific interface to a Promiscuous mode is further performed. Method characterized by including.
According to claim 1,
Detecting that at least one interface among a plurality of interfaces included in the virtual bridge interface is to be deleted;
Selecting an interface to be deleted among a plurality of interfaces included in the virtual bridge interface, when detecting that the at least one interface should be deleted;
And deleting the selected interface from a plurality of interfaces included in the virtual bridge interface.
According to claim 1,
Detecting that at least one interface is to be added to the virtual bridge interface;
Selecting an interface to be included in the virtual bridge interface when it is detected that the at least one interface is to be added;
And adding the selected interface to the virtual bridge interface.
In the communication device of a communication system that supports the Dynamic Host Configuration Protocol (Dynamic Host Configuration Protocol: DHCP),
A virtual bridge interface including a plurality of interfaces having different Media Access Control (MAC) addresses is generated, and the MAC address of the virtual bridge interface is assigned to the plurality of interfaces. Set to the MAC address of the first interface,
Control the receiver to receive an Internet Protocol (IP) address for the communication device from a DHCP server using the MAC address of the virtual bridge interface,
A transmitter is configured to change the MAC address of the data packet having the assigned IP address to the MAC address of the second interface among the plurality of interfaces, and transmit the data packet including the changed MAC address through the second interface. A communication device for transmitting data packets in a communication system supporting DHCP, comprising a controlling controller.
The method of claim 10,
The virtual bridge interface is a communication device, characterized in that the interface that performs the encapsulation (encapsulation) / de-capsulation (de-capsulation) function for the plurality of interfaces.
The method of claim 10,
The MAC address of the virtual bridge interface is the smallest MAC address of the MAC address of each of the plurality of interfaces.
The method of claim 10,
The controller creates a virtual dummy interface,
The virtual dummy interface is included in the virtual bridge interface,
And the MAC address of the virtual bridge interface is the same as the MAC address of the virtual dummy interface.
The method of claim 13,
The controller, if there is an interface using the same MAC address as the MAC address of the virtual dummy interface among a plurality of interfaces included in the virtual bridge interface, the virtual dummy interface includes a plurality of interfaces including the virtual bridge interface Communication device characterized in that the deletion.
The method of claim 13,
The controller has an interface that uses the same MAC address as the MAC address of the virtual dummy interface among a plurality of interfaces included in the virtual bridge interface, and the virtual dummy interface is in an inactive state. A communication device characterized by maintaining a dummy interface.
The method of any one of claims 14 and 15,
When the virtual dummy interface uses the same MAC address of a specific interface among a plurality of interfaces included in the virtual bridge interface, the controller transitions the mode of the specific interface to a Promiscuous mode. Communication device characterized in that.
The method of claim 10,
The controller detects that at least one interface among a plurality of interfaces included in the virtual bridge interface should be deleted, and when detecting that the at least one interface should be deleted, the plurality of interfaces included in the virtual bridge interface And select the interface to be deleted, and delete the selected interface from a plurality of interfaces included in the virtual bridge interface.
The method of claim 10,
The controller detects that at least one interface should be added to the virtual bridge interface, and when detecting that the at least one interface should be added, selects an interface to be included in the virtual bridge interface, and selects the selected interface as the virtual Communication device, characterized in that included in the bridge interface.

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