KR20150081654A - Apparatus and method for allocating internet protocol address in communication system supporting dynamic host configuration protocol - Google Patents

Abstract

The present invention relates to an internet protocol (IP) address allocation method for a communication device in a communication system which supports a dynamic host configuration protocol (DHCP), the invention comprising the steps of: generating a virtual bridge interface including interfaces included in the communication device; setting a media access control (MAC) address of the virtual bridge interface to any one MAC address among the interfaces; and being allocated of an IP address for the communication device by using the MAC address of the virtual bridge interface.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus and a method for assigning an Internet protocol address in a communication system supporting a dynamic host configuration protocol,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for allocating an Internet Protocol (IP) address in a communication system, and more particularly, to a dynamic host configuration protocol (DHCP) To a device and a method for allocating the same IP address in a communication system supporting DHCP (Dynamic Host Configuration Protocol).

There are various ways of assigning an IP address to a communication device, and a typical method is a method using DHCP. Hereinafter, a method of assigning an IP address to a communication device using the DHCP will be described.

First, in a DHCP, a communication device transmits a media access control (MAC) address of the communication device itself to a DHCP server, and requests an 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 assigned an IP address to the communication device using the MAC address .

If it is determined that the DHCP server itself has assigned an IP address to the communication device using the MAC address, the DHCP server determines whether the IP address assigned to the communication device using the MAC address is currently in use Inspect. If it is determined that the IP address is not currently being used, the DHCP server assigns the IP address to the communication device using the MAC address.

Alternatively, if it is determined that the DHCP server has not assigned an IP address to the communication device using the MAC address, and the DHCP server itself has assigned an IP address to the communication device using the MAC address 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.

In recent years, various communication devices, for example, a smart phone, a laptop personal computer (PC), a smart home appliance, As a wireless communication method, for example, a wireless-fidelity (Wi-Fi) method is installed, the various communication devices are used in a wired And a wireless communication interface in addition to the communication interface.

For example, a laptop PC often includes an Ethernet (Ethernet) interface and a Wi-Fi interface, and a smart phone may include an Ethernet interface, a Wi-Fi interface, a Wi-Fi direct (Direct, hereinafter referred to as " Direct ") interface, and the like. In addition to the laptop PC and smart phone, various communication devices include a plurality of communication interfaces.

When a plurality of communication interfaces are included in one communication device, an IP address assigned to the corresponding communication device varies depending on which interface the communication device uses. For example, the IP address allocated when the communication device performs wired communication using the Ethernet method differs from the IP address assigned when the communication device performs wireless communication using the Wi-Fi method.

The communication interfaces each use a unique MAC address. Next, referring to FIG. 1, MAC addresses assigned to the communication device in a general communication system will be described.

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

1, the communication device 100 includes a total of three communication interfaces: 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 the MAC address 5E: 67: EF: EE: 7F: FF and the Wi-Fi interface 113 uses the MAC address 5E: 67: E9: EE: And the Wi-Fi Direct interface 115 uses the MAC address 5E: 67: E9: EE: 7F: 0F.

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

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

Therefore, unnecessary troublesome procedures can be generated by using a plurality of IP addresses in a communication device using a plurality of interfaces.

One embodiment of the present invention proposes an apparatus and method for assigning an 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 DHCP.

A method proposed in an embodiment of the present invention comprises: A method for a communication device to be assigned an Internet Protocol (IP) address in a communication system supporting Dynamic Host Configuration Protocol (DHCP), the method comprising: (MAC) address of the virtual bridge interface to a MAC address of any one of the interfaces; generating a virtual bridge interface including a virtual bridge interface And receiving an IP address for the communication device using the MAC address of the bridge interface.

An apparatus proposed in an embodiment of the present invention comprises: A communication device in a communication system supporting Dynamic Host Configuration Protocol (DHCP), the communication device comprising: a virtual bridge interface including interfaces included in the communication device, A controller for setting a Media Access Control (MAC) address of the interface to a MAC address of one of the interfaces; and an Internet Protocol (IP) address for the communication device using the MAC address of the virtual bridge interface And a receiver for receiving an Internet Protocol (IP) address.

One embodiment of the present invention is advantageous in that it enables the communication device to be assigned the same IP address even though it uses multiple interfaces.

In addition, an embodiment of the present invention has an effect that, when a communication device is dynamically assigned an IP address using DHCP, the same IP address can be used even if the interface used by the communication device is changed. Thus, in one embodiment of the present invention, it is possible to use various interfaces using the same IP address, so that when an application is executed, it can be recognized that even if the physical interface is changed, a logically identical communication device is being used There is that effect. That is, since the application can perform communication using only one IP address even if 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 schematically shows MAC addresses assigned to a communication device in a typical communication system;
2 schematically illustrates 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 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;
4 schematically shows another example of the interface structure of a communication device in a communication system according to an embodiment of the present invention;
5 is a flowchart showing a process of creating a virtual bridge interface of a communication device in a communication system according to an embodiment of the present invention
6 is a diagram schematically illustrating 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 illustrating 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 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
9 is a diagram schematically illustrating a process of a communication device holding a virtual dummy interface in a communication system according to an embodiment of the present invention
10 is a diagram schematically illustrating an operation procedure of a communication device when a virtual dummy interface uses a MAC address identical to a MAC address of an Ethernet interface in a communication system according to an embodiment of the present invention.
11 schematically illustrates an operation procedure 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 schematically illustrates an 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. It should be noted that only the parts necessary for understanding the operation according to the embodiments of the present invention will be described below, and the description of the other parts will be omitted so as not to disturb the gist of the present invention. The following terms are defined in consideration of the functions in the embodiments of the present invention, and may be changed according to the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

The present invention is capable of various modifications and various embodiments, and specific embodiments thereof will be described in detail with reference to the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Also, terms including ordinal numbers such as first, second, etc. may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Also, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Furthermore, in the embodiments of the present invention, all terms used herein, including technical or scientific terms, unless otherwise defined, are intended to be inclusive in a manner that is generally understood by those of ordinary skill in the art to which this invention belongs. Have the same meaning. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and, unless explicitly defined in the embodiments of the present invention, are intended to mean ideal or overly formal .

An 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).

Meanwhile, an apparatus and method for allocating the same IP address in a DHCP-based communication system proposed in an embodiment of the present invention can be applied to long-term evolution (LTE) Communication system, a long-term evolution-advanced (LTE-A) mobile communication system, a high-speed downlink packet access (HSDPA) (HSUPA) mobile communication system and a third-generation project partnership 2 < th > (3 < rd & (HRPD) mobile communication system of a 3GPP2 generation project partnership 2 (3GPP2), a high rate packet data (HRPD) mobile communication system of 3GPP2 (WCDMA) mobile communication system and a 3GPP2 Code Division Multiple Access (CDMA) mobile communication system, A mobile communication system, an IEEE (Institute of Electrical and Electronics Engineers) 802.16m communication system, an evolved packet system (EPS) To a variety of communication systems such as a mobile Internet protocol (hereinafter referred to as 'Mobile IP') system, an IEEE 802.11 system, an IEEE 802.3 system, and a Wi-Fi system 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 fixing the interface in which DHCP is operated. In addition, the virtual dummy interface is used to fix a medium access control (MAC) address of the virtual bridge interface.

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

2, the communication device 200 includes a virtual bridge interface 211, a virtual interface, and a plurality of interfaces, for example, three interfaces: Ethernet An Ethernet interface 213, a Wi-Fi interface 215, a Wi-Fi direct interface 215, a Wi-Fi interface 215, And a Direct (Direct) interface 217.

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

On the other hand, DHCP is generally operated on an interface that is in an active state, which is actually used for communication. Therefore, when the interface used for communication of the communication device 200 is changed, the interface in which the 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, one IP address is assigned to the virtual bridge interface 211, even though the communication device 200 includes multiple interfaces.

2, an example of an interface structure of a communication device in a communication system according to an embodiment of the present invention is described. Next, referring to FIG. 3, a description will be given of an interface structure used in a communication device of a communication system according to an embodiment of the present invention And schematically illustrates the encapsulation function of the virtual bridge interface.

3 is a schematic view of a virtual bridge interface encapsulation function 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 can 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, the Ethernet interface 313, Each of the Wi-Fi interface 315 and the Wi-Fi Direct interface 317 can perform the corresponding interface operation through the virtual bridge interface 311. That is, DHCP is operated in the virtual bridge interface 311.

When the communication is to be performed through the Ethernet interface 313, a signal input to the Ethernet interface 313 or output from the Ethernet interface 313 is encapsulated in the virtual bridge interface 311, 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 is transmitted to the virtual bridge interface Lt; RTI ID = 0.0 > 311). ≪ / RTI >

In addition, when communication is to be performed via the Wi-Fi Direct interface 317, a signal input to the Wi-Fi Direct interface 317 or output from the Wi- And is encapsulated or decapsulated in the bridge interface 311.

In FIG. 3, the encapsulation function of the interfaces used in the communication device of the communication system according to the embodiment of the present invention is described. Next, referring to FIG. 4, in the communication system according to the embodiment of the present invention, Another example of the interface structure of FIG.

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

4, the communication device 400 includes a virtual bridge interface 411, a virtual dummy interface 413, and a plurality of interfaces, for example, two interfaces, that is, a Wi- Fi interface 415, and an Ethernet interface 417. [ Here, the virtual dummy interface 413 operates as one of the interfaces included in the virtual bridge interface 411 even though it is a virtual interface.

The virtual bridge interface 411 is a representative interface to which an IP address is assigned. That is, even though the communication device 400 includes a plurality of interfaces, only one IP address is allocated to the communication device 400, and the one IP address is allocated to the virtual bridge interface 411 .

The virtual bridge interface 411 copies the MAC address of one of the interfaces operating through the virtual bridge interface 411, i.e., the Wi-Fi interface 415 and the Ethernet interface 417, (411) as its own MAC address. The reason that 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 itself 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, the virtual bridge interface 411 may include a MAC address And uses the MAC address of the most bridged interface 411 as its own MAC address. 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 in an inactive state and is located under the virtual bridge interface 411. [ The virtual dummy interface 413 also copies the MAC address of one of the Wi-Fi interface 415 and the Ethernet interface 417 and uses it as the MAC address of the virtual dummy interface 413 itself.

As described in FIG. 4, one IP address is allocated to the virtual bridge interface 411, even though the communication device 400 includes a plurality of interfaces.

4, another example of the interface structure of the communication device in the communication system according to the embodiment of the present invention is described. Next, referring to FIG. 5, in the communication system according to the embodiment of the present invention, The interface generation 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, in step 511, the communication device generates a virtual bridge module and proceeds to step 513. Here, the virtual bridge module is configured in the form of a Linux kernel module, for example. In step 513, the communication device kills the 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 generates a virtual bridge interface by raising a virtual bridge module, and then proceeds to step 517. In step 517, In step 517, the communication device restarts the DHCP process.

Meanwhile, although FIG. 5 shows an example of a process of creating a virtual bridge interface of a communication device in a communication system according to an embodiment of the present invention, various modifications may be made to FIG. As an example, although successive steps are shown in FIG. 5, it is understood that the steps described in FIG. 5 may overlap, occur in parallel, occur in different orders, or occur multiple times.

FIG. 5 illustrates a process of creating a virtual bridge interface of a communication device in a communication system according to an embodiment of the present invention. Referring to FIG. 6 and FIG. 7, in the communication system according to an embodiment of the present invention, The interface replacement process included in the virtual bridge interface of FIG.

6 is a diagram schematically illustrating 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.

Referring to FIG. 6, if it is determined in step 611 that the communication system should delete the interfaces included in the virtual bridge interface, step 613 is performed. In step 613, the communication system selects at least one interface 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 the interface included in the virtual bridge interface.

6 illustrates 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 exemplary embodiment of the present invention, various modifications may be made to FIG. 6 to be. As an example, although successive steps are shown in FIG. 6, it is understood that the steps described in FIG. 6 may overlap, occur in parallel, occur in different orders, or occur multiple times.

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, with reference to FIG. 7, A process of adding an interface included in a virtual bridge interface of a communication device will be described.

7 is a diagram schematically illustrating 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, if it is determined in step 711 that the communication system should add interfaces included in the virtual bridge interface, step 713 is performed. In step 713, the communication system selects 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.

Although FIG. 7 illustrates 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 may be made to FIG. 7 to be. In one example, although the steps are shown in FIG. 7, the steps described in FIG. 7 may overlap, occur in parallel, occur in different orders, or occur multiple times.

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

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

Referring to FIG. 8, if it is detected in step 811 that the communication device deletes the virtual dummy interface, the process proceeds to step 813. Here, the case where 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 the copied MAC address as the MAC address of the virtual dummy interface itself. Therefore, the communication interface includes two interfaces using the same MAC address. However, when two interfaces using the same MAC address are included in the virtual bridge interface, the virtual bridge interface determines whether a data packet to be transmitted / received using the corresponding MAC address is transmitted / received It is impossible to distinguish between the two. Thus, 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 of a communication device deletes a virtual dummy interface in a communication system according to an embodiment of the present invention, various modifications may be made to FIG. As an example, although consecutive steps are shown in FIG. 8, it is understood that the steps described in FIG. 8 may overlap, occur in parallel, occur in different orders, or occur multiple times.

8, a description has been given 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. Next, referring to FIG. 9, in a communication system according to an embodiment of the present invention, The process of maintaining the virtual dummy interface will be described.

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

9, in step 911, the communication device detects that interfaces using the same MAC address exist, and proceeds to step 913. In step 913, the communication device determines whether to hold the virtual dummy interface, and proceeds to step 915. Here, the operation of determining whether or not 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 the copied MAC address as the MAC address of the virtual dummy interface itself. 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 uses the corresponding MAC address to identify which interface the data packet to be transmitted / received is to be transmitted / received impossible. Thus, if 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 the inactive state. If it is determined that the virtual dummy interface is in the inactive state, it is determined 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 in an inactive state, the communication device determines to keep the virtual dummy interface at 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 or not.

Meanwhile, although FIG. 9 shows an example of a process of a communication device holding a virtual dummy interface in a communication system according to an embodiment of the present invention, various modifications may be made to FIG. As an example, although successive steps are shown in FIG. 9, it is understood that the steps described in FIG. 9 may overlap, occur in parallel, occur in different orders, or occur multiple times.

FIG. 9 illustrates a process of a communication device holding a virtual dummy interface in a communication system according to an embodiment of the present invention. Referring to FIG. 10, in a communication system according to an embodiment of the present invention, An operation procedure of the communication device in the case of using the same MAC address as the MAC address of the Ethernet interface will be described.

10 is a diagram schematically illustrating an operation procedure of a communication device when a virtual dummy interface uses a MAC address identical to a MAC address of an Ethernet interface in a communication system according to an embodiment of the present invention.

Referring to FIG. 10, 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. If the MAC address of the virtual dummy interface is equal to 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 mode (Promiscuous). Here, if the Ethernet interface is already operating in the promiscuous mode, step 1013 may be omitted.

As the operation mode of the Ethernet interface transitions to the promiscuous mode, the Ethernet interface can transmit / receive data packets having MAC addresses different from the MAC address of the Ethernet interface itself.

10 shows an example of the operation process of the communication device when the virtual dummy interface uses the same MAC address as the MAC address of the Ethernet interface in the communication system according to the embodiment of the present invention. 10, for example. In one example, although successive steps are shown in FIG. 10, it is understood that the steps described in FIG. 10 may overlap, occur in parallel, occur in different orders, or occur multiple times.

10, the operation procedure of the communication device when the virtual dummy interface uses the same MAC address as the MAC address of the Ethernet interface in the communication system according to the embodiment of the present invention has been described. Next, An operation process of the communication device in the case where the virtual dummy interface uses the MAC address of the Wi-Fi interface or the MAC address of the Wi-Fi Direct interface in the communication system according to one embodiment will be described.

11 schematically illustrates an operation procedure 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. Fig.

11, 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. If the MAC address of the virtual dummy interface is equal to 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 the Wi-Fi Direct interface through the virtual bridge interface to use a Wi-Fi interface or a Wi-Fi Direct interface.

11 is a flowchart illustrating an operation procedure of a communication device when a virtual dummy interface uses a MAC address identical to 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. Although one example is shown, it will be appreciated that various modifications may be made to Fig. In one example, although the sequential steps are shown in FIG. 11, it is understood that the steps described in FIG. 11 may overlap, occur in parallel, occur in different orders, or occur multiple times.

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

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

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 in particular controls to perform operations related to virtual bridge interfaces and interface operations. 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 FIG. 2 to FIG. 11, and a 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 required for the operation of the communication device 1200.

The transmitter 1217 transmits various messages according to the control of the controller 1213.

12 shows a case where the communication device 1200 is implemented as separate units of the receiver 1211, the controller 1213, the storage unit 1215, and the transmitter 1217, 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.

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, 1217).

Meanwhile, although not separately shown, the virtual bridge interface and the interfaces are managed in the manner as described above, so that the DHCP server can assign one IP address to one communication device.

Also, it will be appreciated that an apparatus and method for assigning the same IP address in a communication system supporting DHCP according to an embodiment of the present invention can be implemented in hardware, software, or a combination of hardware and software. Such arbitrary software may be stored in a memory such as, for example, a volatile or non-volatile storage device such as a storage device such as ROM or the like, or a memory such as a RAM, a memory chip, a device or an integrated circuit, , Or a storage medium readable by a machine (e.g., a computer), such as a CD, a DVD, a magnetic disk, or a magnetic tape, as well as being optically or magnetically recordable. 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 implemented by a computer or a mobile terminal including a controller and a memory, Readable storage medium suitable for storing a program or programs containing instructions for implementing the method of the present invention.

Accordingly, the invention includes a program comprising code for implementing the apparatus or method as claimed in any of the claims herein, and a storage medium readable by a machine (such as a computer) for storing such a program. In addition, such a program may be electronically transported through any medium such as a communication signal transmitted via a wired or wireless connection, and the present invention appropriately includes the same.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (18)

A method for a communication device to be assigned an Internet Protocol (IP) address in a communication system supporting Dynamic Host Configuration Protocol (DHCP)
Generating a virtual bridge interface including interfaces included in the communication device;
Setting a media access control (MAC) address of the virtual bridge interface to one of the interfaces;
And receiving an IP address for the communication device using the MAC address of the virtual bridge interface. The method of claim 1, wherein the IP address is allocated to the communication device in the communication system supporting DHCP.
The method according to claim 1,
Wherein the virtual bridge interface is an interface for performing an encapsulation / de-capsulation function on the interfaces. [0034] In the communication system supporting DHCP, .
The method according to claim 1,
Wherein the MAC address of the virtual bridge interface is the smallest MAC address among the MAC addresses of the interfaces.
The method according to claim 1,
Further comprising the step of creating a virtual dummy interface,
Wherein the virtual dummy interface is included in the virtual bridge interface,
Wherein the MAC address of the virtual bridge interface is the same as the MAC address of the virtual dummy interface.
5. The method of claim 4,
Further comprising the step of deleting the virtual dummy interface from the interfaces included in the virtual bridge interface when an interface using the same MAC address as the MAC address of the virtual dummy interface exists among the interfaces included in the virtual bridge interface Wherein the communication device is assigned an IP address in a communication system supporting DHCP.
5. The method of claim 4,
There is an interface using the same MAC address as the MAC address of the virtual dummy interface among the interfaces included in the virtual bridge interface and the virtual dummy interface is maintained when the state of the virtual dummy interface is inactive The method of claim 1, wherein the IP address is assigned to a communication device in a communication system supporting DHCP.
7. The method according to any one of claims 5 to 6,
And transitioning the mode of the specific interface to a promiscuous mode when the virtual dummy interface uses the same MAC address as the MAC address of the specific interface among the interfaces included in the virtual bridge interface Wherein the communication device is assigned an IP address in a communication system supporting DHCP.
The method according to claim 1,
Detecting that at least one of the interfaces included in the virtual bridge interface is to be deleted;
Selecting an interface to be deleted among the interfaces included in the virtual bridge interface upon detecting that the at least one interface is to be deleted;
Further comprising the step of deleting the selected interface from the interfaces included in the virtual bridge interface. The method of claim 12, wherein the IP address is allocated to the communication device in the communication system supporting DHCP.
The method 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 upon detecting that the at least one interface should be added;
Further comprising the step of including the selected interface in the virtual bridge interface.
1. A communication device in a communication system supporting Dynamic Host Configuration Protocol (DHCP), comprising:
The method comprising: generating a virtual bridge interface including interfaces included in the communication device and transmitting a media access control (MAC) address of the virtual bridge interface to one of the interfaces To the MAC address of the MAC address,
And a receiver for receiving an Internet Protocol (IP) address for the communication device using the MAC address of the virtual bridge interface.
11. The method of claim 10,
Wherein the virtual bridge interface is an interface for performing an encapsulation / de-capsulation function for the interfaces.
11. The method of claim 10,
Wherein the MAC address of the virtual bridge interface is the smallest MAC address among the MAC addresses of the interfaces.
11. The method of claim 10,
The controller creates a virtual dummy interface,
Wherein the virtual dummy interface is included in the virtual bridge interface,
Wherein the MAC address of the virtual bridge interface is the same as the MAC address of the virtual dummy interface.
14. The method of claim 13,
Wherein the controller deletes the virtual dummy interface from the interfaces included in the virtual bridge interface when an interface using the same MAC address as the MAC address of the virtual dummy interface exists among the interfaces included in the virtual bridge interface The communication device comprising:
14. The method of claim 13,
Wherein the controller has an interface using the same MAC address as the MAC address of the virtual dummy interface among the interfaces included in the virtual bridge interface, and when the state of the virtual dummy interface is in an inactive state, Wherein the DHCP server is configured to maintain the DHCP.
16. The method according to any one of claims 14 to 15,
The controller changes the mode of the specific interface to a promiscuous mode when the virtual dummy interface uses the same MAC address as the MAC address of the specific interface among the interfaces included in the virtual bridge interface The communication device comprising:
11. The method of claim 10,
Wherein the controller detects that at least one interface among the interfaces included in the virtual bridge interface is to be deleted and detects that the at least one interface should be deleted, And deletes the selected interface from the interfaces included in the virtual bridge interface.
11. The method of claim 10,
Wherein 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, Wherein the DHCP server is included in the bridge interface.

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