KR101367180B1 - An apparatus for switching and sharing network services and the method thereof - Google Patents

Abstract

According to the present invention, while a P2P network service is performed between terminals belonging to different networks configured by using NAT, the service is switched to another terminal of the network in a network to which one of the terminals belongs, or continuously performed. The present invention relates to an apparatus and method for switching and sharing a network service that can improve user convenience by allowing one terminal and another terminal to share a network service.

Description

Devices and methods for switching and sharing network services {AN APPARATUS FOR SWITCHING AND SHARING NETWORK SERVICES AND THE METHOD THEREOF}

The present invention relates to an apparatus and method for switching and sharing a network service, and more particularly, a terminal receiving a service while performing P2P network service between terminals belonging to different networks configured using NAT. The present invention relates to a device and a method for switching and sharing a network service in which the service is switched to another terminal and continuously provided to the other network, or allowing the other terminal to share the service with the terminal receiving the service.

FIG. 1 is an exemplary diagram for explaining a P2P communication method between terminals in a network configured using a conventional NAT, and as shown in FIG. 1, a first network configured using a network address translation (NAT) 201, 202 ( It is assumed that 10) and specific terminals 101 and 103 belonging to the second network 20 are performing peer to peer (P2P) communication with each other. The NAT may be a router or a home gateway.

The first network 10 and the second network 20 use different public IP addresses, and terminals belonging to each network use a private IP address set through NAT1 201 or NAT2 202.

The NAT 201 and 202 converts a private IP address into a public IP address. When using the NAT, first, it is possible to save the public IP address of the Internet, and second, there is an effect that can protect the unique private network of users connected to the public network called the Internet from intruders. In other words, the public IP address of the Internet is limited, so that as many people as possible need to use the Internet, it is necessary to convert a private IP address into a public IP address using NAT. It is intended to be used by many.

In addition, the NAT may be used as a basic means of protecting a user's communication network from an external attack by installing a firewall between the public Internet and a private network. For example, when NAT is set up on a router, which is a device that connects to an external communication network, that is, an Internet network, the router makes the public IP address assigned to itself known only to the outside, and only the private IP address is used internally. By converting, it is possible to protect the internal network because the attack is impossible because the external intruder needs to know the private IP address of the private network in order to attack.

The STUN server 300 is located outside the NAT and uses the Simple Traversal of User Datagram Protocol Through Network Address Translators (STUN) protocol to determine the existence of NAT, NAT public IP addresses, and applications running in the NAT environment. It finds out the UDP port (what port NAT assigned to the current application).

As shown in FIG. 1, terminal 1 101 and terminal 3 103 perform hole punching using an external STUN server 300 to perform P2P communication.

Here, hole punching means obtaining a NAT public IP address of a counterpart terminal and UDP port information of an application through a STUN server in advance for P2P communication, and creating a table in each terminal's NAT (or router). For example, when the terminal 1 and the terminal 3 wants to communicate, the STUN server 300 sends the IP information to the terminal 1 and the terminal 3 at the same time, and the terminal 1 and the terminal 3 respectively make a table in the NAT and store it. Refers to the table, it means the method of direct connection and communication.

The P2P communication is a technology that allows the information provider and the information receiver to be directly connected and exchange information without intermediary, so that they can easily share the information each individual has, such as music, video, video, text files, etc. Allows you to share data one-to-one (or one-to-many) with the other party.

By the way, conventionally, the terminal 1 (101) and the terminal 3 (103) assuming that the P2P communication, the other terminal of the network (for example, the first network) to which one terminal (for example, terminal 1) belongs (Eg, terminal 2) to continue the P2P communication service with the terminal 3 (103), or by sharing a packet between the terminal 1 (101) and the terminal 2 (102) and the terminal 3 (103) and P2P The communication service could not be performed.

For example, while the terminal 1 101 and the terminal 3 103 are connected to the P2P communication and receive the video from the terminal 1, the terminal 1 101 and the terminal 3 103 may switch to the terminal 2 102 of the same network to continuously receive the video. There was no. If terminal 2 (102) in order to receive the video from the terminal 3 (103) P2P connection between the terminal 2 (102) and the terminal 3 (103), all procedures for selecting and receiving the video in the terminal 3 (103) There was a problem that must be performed from the beginning.

The present invention was created to improve the above problems, and switching between network services to continue to perform network services even if one terminal is switched to another terminal while performing P2P network services between the terminals. And a device and method for sharing the same.

The present invention was created to improve the above problems, and switching a network service to share the network service by adding another terminal to any one of terminals that were performing P2P network services. Its purpose is to provide a sharing device and a method thereof.

An apparatus for switching and sharing a network service according to an aspect of the present invention may include a first terminal connected to a first network address translation (NAT) and a second terminal connected to a second NAT and performing a P2P network service with the first terminal. And a third terminal connected to the second NAT and including a third terminal for applying for switching or sharing service of the network service, the network comprising: a service request signal receiving unit receiving a service request signal of the third terminal; A destination address detector for detecting a destination address where the network service is being performed; Change the destination address of the detected network service to the third terminal applying for the service to switch the network service, or change the destination address sharing the network service by adding the third terminal applying for the service as a destination address; Additional part; And a control unit.

According to another aspect of the present invention, a method of switching and sharing a network service includes: a first terminal connected to a first NAT, a second terminal connected to a second NAT and performing a P2P network service with the first terminal; In the network comprising a third terminal connected to the second NAT and applying for switching or sharing service of the P2P network service, a first step of receiving a service request signal of the third terminal; A second step of detecting a destination address being changed; changing a detected destination address of the network service to a third terminal applying for the service to switch network services, or further adding a third terminal applying for the service as a destination address; In addition, a third step of sharing a network service;

The present invention has the effect of improving the user's convenience by enabling the service to continue even if any one of the terminals performing the P2P network service is switched to another terminal.

The present invention has the effect of improving the convenience of the user by allowing the sharing of the service by further adding any one terminal and another terminal among the terminals performing the P2P network service.

1 is an exemplary diagram for explaining a P2P communication method between terminals in a network configured using a conventional NAT.
2 is an exemplary view for explaining a method of switching and sharing a terminal for P2P communication according to an embodiment of the present invention.
3 is a flowchart illustrating a method of switching and sharing a terminal for P2P communication in FIG.
4 is an exemplary diagram for describing a method of searching for a target terminal list using hole punching according to an embodiment of the present invention.
5A and 5B are exemplary diagrams for explaining a method of performing switching or sharing of a network service in a NAT according to an embodiment of the present invention.
6 is an exemplary view showing the configuration of an apparatus for applying for switching or sharing of a network service according to an embodiment of the present invention.
FIG. 7 is an exemplary view illustrating a user interface screen of a device for applying for switching or sharing of the network service in FIG. 6.
8 is an exemplary view illustrating a configuration of a device for switching and sharing a network service according to an embodiment of the present invention.

Hereinafter, an embodiment of an apparatus and method for switching and sharing a network service according to the present invention will be described with reference to the accompanying drawings.

FIG. 2 is an exemplary diagram for describing a method of switching and sharing a terminal for P2P communication according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating a method for switching and sharing a terminal for P2P communication in FIG. 2. It is a flowchart for doing this.

As shown in FIG. 2, the terminal 1 101 connected to the NAT1 201 of the first network 10 and the terminal 3 103 connected to the NAT2 202 of the second network 20 are provided. It is assumed that P2P communication of a specific network service (eg, Service A) is performed.

At this time, as shown in Figure 3, the terminal 2 (102) connected to NAT1 (201) of the first network (10) to the network device (for example, NAT1) for switching and sharing the network service according to the present invention When applying for switching / sharing (or terminal switching / sharing) for a service (for example, Service A) (S101), the device for switching and sharing the network service according to the present invention uses a specific table T1 stored therein. With reference, the destination address (eg, IP address and port number of the specific terminal performing the network service) of the network service (eg, Service A) is detected (S102).

In addition, when the detected destination address is assumed to be terminal 1 (101), the terminal receives destination addresses (eg, an IP address and a port number) of all packets of a network service (eg, Service A) destined for the terminal 1 (101). Change to 2 (102) or add (S103).

For example, in the step S101 of FIG. 3, when the terminal 2 requests to switch the network service, as shown in FIG. 2 (a), all packets of the network service directed to the terminal 1 101 are transmitted to the terminal 2. Change to 102 and pass. In the step S101 of FIG. 3, when the terminal 2 requests to share a network service, as shown in FIG. 2B, destination addresses of all packets of the network service directed to the terminal 1 101 are provided. Terminal 2 (102) is further added to enable network services to be shared.

Here, the apparatus for switching and sharing the network service according to the present invention may be included in a NAT or configured separately. The specific table T1 refers to a table in which an IP address and a port number of a terminal on which a specific network service is performed are mapped.

In a first embodiment, the specific table T1 parses payloads of all packets transmitted from terminals connected to NAT, and thus, transmits specific data (for example, data indicating start of a network service). Detect and store the packet's IP address and port number in table format. At this time, the NAT updates the specific table T1 by detecting the IP address and port number of the terminal performing the network service whenever a new network service is started.

As a second embodiment, the specific table T1 of the NAT may be updated using information received from an external STUN server 300. For example, as shown in Figure 4, the external STUN server 300 and the internal / external access IP (eg, Local IP address, Global IP address) of both terminals (eg, terminal 1 and terminal 3) in P2P communication Port information is found and stored in the STUN server 300 by creating a specific table (T2). As described above, in the situation where terminal 1 (101) and terminal 3 (103) are performing P2P communication of a specific network service (eg, Service A), terminal 2 (102) connects NAT1 (201) to STUN server (300). When requesting all P2P information connected through the STUN server 300, the STUN server 300 is the P2P information (P2P service and the terminal performing the service) mapped to the NAT (eg, NAT1, NAT2) connected to each terminal from the specific table (T2) IP address and port number) are detected and responds to terminal 2 (102). Accordingly, the terminal 2 102 having the P2P information updates the specific table T1 of the NAT1 201 by performing hole punching.

As a third embodiment, the specific table T1 of the NAT may search for and update a network service being performed between terminals. For example, when UE 1 and UE 3 are performing P2P communication of a specific network service (eg, Service A), UE 2 102 connects to P1P of a specific network service (eg, Service A) to UE 1 101. When inquiring whether the P2P connection information (eg, IP address, port number), the terminal 1 responds to the terminal 2 with the connection information of a specific network application (eg, Service A). Accordingly, the terminal 2 102 obtained the connection information may update the specific table T1 of the NAT1 201. In this case, each network service (or each terminal) includes a function of informing P2P connection information about a query of the counterpart.

In this particular table (T1), not only the IP address and port number of the terminal, but also service information (eg, Service A, Service B, Service C) and terminal ID information (eg, MAC address, set by default or set by the user). Device name) may be further stored. When the terminal is switched / shared as described above, the specific table T1 is updated, and when the STUN server 300 is used, the specific table T2 of the STUN server 300 is also updated.

5A and 5B are exemplary diagrams for describing a method of performing switching or sharing of a network service in a NAT according to an embodiment of the present invention. As described above, when the terminal 2 and the terminal 2 requests the reception / sharing (switching / sharing of the terminal) in the state that the terminal 1 and the terminal 3 performs the network service, the NAT is directed to the terminal 1 (101) network service (eg : Change or add a destination address (for example, an IP address and a port number) of all packets of the service A to the terminal 2 (102).

Hereinafter, a description will be given of a method of switching or sharing a network service in the NAT.

As a first embodiment, as shown in FIG. 5A, a NAT that receives an application for switching / sharing a network service from terminal 2 102 uses a dynamic forwarding method, and thus a destination address of a packet received from terminal 3 103. Change or add to terminal 2.

For example, NAT1 201 receiving a destination change request message (network service switch request) including 'IP address / source port of original destination terminal (terminal 1)' and 'IP address / source port of terminal (terminal 2) to be changed'. ) Forcibly deletes the NAT session created by the port of the original destination terminal (terminal 1), and sets a dynamic forwarding rule to the address of terminal 2 to be changed. The reason why the NAT session is forcibly deleted is because the priority of the forwarding rule is lower than that of the P2P session generated by the general method. Therefore, a procedure to forcibly delete the NAT session is required.

As a second embodiment, as shown in FIG. 5B, the NAT1 201 that receives a request for switching / sharing a network service from the terminal 2 102 uses the OS (Operating System) method from the terminal 3 (103). Change or add the destination address of the received packet to terminal 2.

For example, each time NAT1 201 received a destination change request receives a P2P packet from terminal 3 103 of a corresponding network service in an OS (Operating System) level network stack, the NAT1 201 receives a packet from the terminal 3 103. Forcibly change or add the destination address to terminal 2. To this end, ALG (Application Level Gateway) can be added to NAT.

As described above, the NAT, which has been applied for the switching or sharing of the network service (or the switching or sharing of the terminal) from the terminal 2, uses one of the following methods: (1) dynamic forwarding or (2) OS of the NAT. The destination address of the packet received from the third 103 is changed or added to the terminal 2, and then forwarded.

If the NAT includes an agent function as described above, the network service can be switched or shared by using a P2P connection information table (T1) provided by the NAT itself or by requesting P2P connection information from a STUN server. have. However, when there is no agent function (Legacy method), when receiving network service switching or sharing request from a specific terminal, the destination address is automatically transferred within a predetermined time (eg 1 second) to the terminal applying for service switching / sharing. Change or add

At this time, the terminal applying for the switching / sharing of the network service is automatically applied when the power is turned on, or when a predetermined specific button is input, the application is automatically made, or a random terminal is newly added to the network. The application can be made automatically when you are connected. Alternatively, the service interface may be applied for switching / sharing in a more various manner using a user interface as follows.

6 is an exemplary view showing the configuration of an apparatus for applying for switching or sharing of a network service according to an embodiment of the present invention.

As shown therein, the apparatus for requesting the switching and sharing of the network service includes the UI unit 111, the service searching unit 112, the service information storage unit 113, the switching / sharing application unit 114, and the terminal controller 115. It is configured to include).

The device for applying for the switching and sharing of the network service may be configured as a hardware or software module, and is installed (or installed) in each terminal connected to NAT to apply for the switching or sharing of the network service. Here, each terminal connected to the NAT includes all terminals capable of networking by connecting to the NAT in a wired / wireless manner such as a TV, a wired / wireless phone, a smartphone, a mobile terminal, a Tablet-PC, a computer, or a PDA.

The UI unit 111 outputs a user interface screen for service switching or sharing request to NAT. The user interface screen includes information of terminal 1 currently serving P2P network service, information of terminal 2 applying for service switching or sharing, authentication information (password) for user authentication of terminal 2 applying for service switching or sharing, and service to be applied. At least one or more pieces of information of the selection information of the (switching / sharing service) are included.

The service information storage unit 113 stores at least one or more information of internal / external access IPs, port numbers, and IDs of terminals currently executing P2P network services, and, upon request, lists the terminals (currently in NAT). A list of connected terminals) is displayed on a user interface screen so that a user can select a desired terminal. In this case, the information stored in the service information storage unit 113 is information retrieved through the service search unit 112. The service searching unit 112 may detect using any one of the three embodiments described with reference to FIGS.

The switch / sharing application unit 114 may be configured with predetermined information (eg, information of UE1 currently serving P2P network service, information of UE2 applying for service switching / sharing, and selection information of a service (switching / sharing service) to apply for). Send service request message including) to NAT. In this case, the service request signal may be transmitted using the UPnP method, and the service request message may further include authentication information (password) for user authentication of the terminal 2. FIG.

The terminal controller 115 controls the components organically, and stores information related to the terminal searched through the service search unit 112 (eg, internal / external IP and port number, ID of the terminal). The information stored in the service information storage unit 113 on the user interface screen, or the switching / sharing application unit 114 according to the information received through the UI unit 111. Apply for switching or sharing service of the terminal through.

FIG. 7 is an exemplary view showing a user interface screen of a device for requesting switching or sharing of the network service in FIG. 6.

The user interface screen 120 for the switching or sharing application of the network service includes an ID (eg, MAC address, device name set by default or set by the user) 123 of the terminal 1 currently serving P2P network service, or service switching or the like. It may include at least one information of the ID 124 of the terminal 2 applying for sharing and the password 125 for user authentication of the terminal 2 applying for the switching or sharing.

Here, the terminal (eg, terminal 1) currently serving P2P network may be selected from the list.

The terminal list (terminal list currently connected to NAT and performing P2P network service) may receive a specific button 122 and output the pull-down method, and the user selects a desired terminal from the pulled-down terminal list and selects the terminal. It can apply for the switching or sharing of services being performed in the terminal.

In another embodiment, the P2P network service list currently being executed may be output in a pull-down manner instead of the terminal list. The user can select a service from the service list and apply for service switching or sharing.

When the user inputs the search button 121, the terminal list searches for a terminal in network service. The terminal in the network service may be detected using any one of the three embodiments described with reference to FIGS. 2 to 3.

In addition, the user interface screen 120 may further include selection buttons 126 and 127 for selecting a service (switching / sharing) to apply for in terminal 2. For example, when the terminal 2 applies for service switching of the terminal 1, the first selection button 126 is checked, and when the terminal 2 requests sharing with the terminal 1, the second selection button 127 is checked.

After inputting all the information necessary for switching or sharing of the terminal as described above, if the user enters the service request button 128, the terminal 2 transmits a service request message including the information to NAT1 (201) Perform service switch / share application.

In this case, the terminal 2 performs a switch / sharing request of the service by using a Universal Plug and Play (UPnP) method. In this case, a UPnP server (not shown) is driven in the NAT, and the NAT includes a function of transmitting and receiving information necessary to change a destination address of a packet by using the UPnP server. Alternatively, instead of the UPnP server, another separate server may be driven to transmit and receive information necessary to change the destination address.

When the terminal 2 selects and applies a desired service (eg, switching / sharing) as described above, the NAT performs switching or sharing of the service requested by the terminal 2, and sends the destination address of the packet received from the terminal 3 to the terminal. Change or add to 2 to pass.

8 is an exemplary view illustrating a configuration of a device for switching and sharing a network service according to an embodiment of the present invention.

As shown in the drawing, the network service switching and sharing apparatus includes a service request signal receiving unit 211 for receiving a switching / sharing request signal of a network service, a destination address detecting unit 212 for detecting a destination address of the network service, and the And a destination address changing / adding unit 213 for changing or adding a destination address of a network service according to the requested service.

The service request signal receiving unit 211 receives a network service switching / sharing request signal from the terminal 2 102 connected to the NAT of a specific network.

The service request signal may be received by using the UPnP method, and the service request signal includes information of terminal 1 currently serving P2P network service, information of terminal 2 applying for service switching / sharing, and service to be applied (switching / sharing service). It may include selection information of, and may further include authentication information (password) for user authentication of the terminal 2.

The destination address detection unit 212 detects a destination address of the network service (eg, an IP address and a port number of the terminal 1 currently performing a network service) by referring to a specific table T1 in which P2P connection information is stored.

The destination address changing / adding unit 213 changes or adds the destination address of all packets of the network service destined for the detected destination address of the terminal 1 to the terminal 2 applying for the switching / sharing service. The changed or added destination address updates the specific table T1. The destination address changing / adding unit 213 performs the switching or sharing of network services in any one of a preset manner (eg, (1) dynamic forwarding method and (2) OS method).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the technical scope of the present invention should be defined by the following claims.

111: UI unit 112: service search unit
113: service information storage unit 114: conversion and sharing application unit
115: terminal control unit 211: service request signal receiving unit
212: destination address detection unit 213: destination address change / addition unit

Claims (12)

A first terminal connected to a first NAT (Network Address Translation), a third terminal connected to a second NAT and performing a P2P network service with the first terminal, and a switch or sharing of the network service connected to the first NAT. An apparatus for supporting switching or sharing of a network service in a network including a requesting second terminal,
A service request signal receiver configured to receive a request signal for switching or sharing the network service from the second terminal;
A destination address detector for detecting a destination address where the network service is being performed;
By using a dynamic forwarding method or an operating system (OS) method, a destination address of the detected network service is changed to a second terminal that has applied for the network service to switch network services, or a second terminal which has applied for the network service. A destination address changing / adding unit further adding a network address as a destination address; Device that supports switching or sharing a network service comprising a. The method according to claim 1,
The destination address detection unit,
It is configured to detect a destination address by referring to a specific table in which P2P connection information is stored.
The P2P connection information supports switching or sharing a network service, including at least one of public or private IP addresses, port numbers, service information, or terminal ID information of a terminal performing a network service. Device. The method according to claim 2,
The specific table,
Parses the payload of all packets transmitted from the terminals connected to the NAT, detects specific data indicating the start of the network service, and detects P2P connection information from the corresponding packet,
Receive P2P connection information from a Simple Traversal of User Datagram Protocol Through Network Address Translators (STUN) server, or
An apparatus for supporting switching or sharing of a network service, characterized in that the terminal is configured to query whether P2P connection of a specific network service and P2P connection information, and to receive and store P2P connection information as a response to the query. The method according to claim 1,
The dynamic forwarding method,
And forcibly deleting the NAT session created by the port of the first terminal, and setting a dynamic forwarding rule to the second terminal to change the destination address. . The method according to claim 1,
The OS (Operating System) method,
Whenever an OS level network stack receives a packet to a first terminal for a corresponding network service, the network service is configured to switch or share a network service, forcibly changing or adding a destination address of the packet to a second terminal. Devices that support doing so. A first terminal connected to a first NAT (Network Address Translation), a third terminal connected to a second NAT and performing a P2P network service with the first terminal, and a switch or sharing of the network service connected to the first NAT. In a network including a second terminal for applying, in a method for supporting switching or sharing of network services,
A first step of receiving an application signal for switching or sharing of the network service from the second terminal;
Detecting a destination address where the network service is being performed;
By using a dynamic forwarding method or an operating system (OS) method, a destination address of the detected network service is changed to a second terminal that has applied for the network service to switch network services, or a second terminal which has applied for the network service. A third step of sharing the network service by further adding as a destination address; Method for supporting switching or sharing the network service, characterized in that configured to include. The method of claim 6,
The second step comprises:
It is configured to detect a destination address by referring to a specific table in which P2P connection information is stored.
The P2P connection information supports switching or sharing a network service, including at least one of public or private IP addresses, port numbers, service information, or terminal ID information of a terminal performing a network service. Way. The method of claim 7,
The specific table,
Parses the payload of all packets transmitted from the terminals connected to the NAT, detects specific data indicating the start of the network service, and detects P2P connection information from the corresponding packet,
Receive P2P connection information from a Simple Traversal of User Datagram Protocol Through Network Address Translators (STUN) server, or
A method for supporting switching or sharing of a network service, characterized in that the terminal is configured to query whether P2P connection of a specific network service and P2P connection information, and to receive and store P2P connection information as a response to the query. The method of claim 6,
The dynamic forwarding method,
And forcibly deleting the NAT session created by the port of the first terminal, and setting a dynamic forwarding rule to the second terminal to change the destination address. The method of claim 6,
The OS (Operating System) method,
Whenever an OS level network stack receives a packet to a first terminal for a corresponding network service, the network service is configured to switch or share a network service, forcibly changing or adding a destination address of the packet to a second terminal. How to support. The method of claim 6,
The application signal for switching or sharing of the network service,
A method of supporting switching or sharing of a network service, characterized by receiving by using a Universal Plug and Play (UPnP) method. A first terminal connected to a first NAT (Network Address Translation), a third terminal connected to a second NAT and performing a P2P network service with the first terminal, and a switch or sharing of the network service connected to the first NAT. In a network including a subscribing second terminal, a network service is switched by changing a destination address of a network service to a second terminal applying for the network service using a dynamic forwarding method or an operating system (OS) method, or An apparatus for applying for switching or sharing of a network service in the second terminal of the network sharing the network service by further adding a second terminal applying for network service as a destination address,
A user interface (UI) unit for requesting service switching or sharing to the first NAT, the second NAT, or a combination thereof;
A service information storage unit which stores at least one or more information of internal and external access IP addresses, port numbers, service information, and terminal IDs of the terminals executing the network service;
A service search unit for searching for information stored in the service information storage unit;
The first NAT, the second NAT or a combination thereof includes a service request message including information on a preset first terminal, information on a second terminal applying for service switching or sharing, and information on selection of a service for switching or sharing to be applied. A conversion / sharing application to send to; And
And a terminal controller for controlling the user interface unit, the service search unit, the service information storage unit, and the switching / sharing application unit.

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