KR20140029999A - The internal server to be able to connect to internal device from outside of internet line sharer - Google Patents

Abstract

A router is a significantly superior device in that the router not only solves a problem of a lack authorized IP, but also allows several PCs or several devices to access an external device through one authorized IP. However, in the router, the Internet access from a device within a coverage of the router to a device out of the coverage of the router is freely performed, but the access to the device within the coverage from the device out of the coverage of the router is difficult. In the case of the access to a specific port number of the router from the device out of the coverage of the router, even the device out of the coverage of the router can access the device within the coverage of the router because there is a port forwarding function for connection to a specific port number of a device having a specific IP address. However, a port number of the router, an IP address of an internal device, and a port number of the internal device have to be fixedly set, but it is difficult to previously set the above information because most routers dynamically allocate IP addresses by using a DHCP function of the router. According to the present invention, an additional server is provided within the coverage of the router, so that the access to the device within the coverage of the router is possible. According to the present invention, a device out of the coverage of the router can access a specific device within the coverage of the router. [Reference numerals] (1) Control unit; (2) External connector; (3) Internal connector; (AA) Internet; (BB) Router; (CC) Internal computer

Description

The internal server to be able to connect to internal device from outside of internet line sharer}

Internet, Router, Port Forwarding Technology, Relay

A router is a very useful device that not only solves the lack of public IP but also allows multiple PCs or devices to be connected to the outside through a single public IP.

The router is free to access the internet from the inside of the router to the outside, but it is difficult to connect to the devices inside the router from the outside.

When the router is connected to a specific port number of the router from the outside, the port forwarding function connects to a specific port number of a device having a specific IP inside the router.

However, it is difficult to set in advance because most routers dynamically assign IP addresses using the DHCP function of the router.

The present invention is a server device existing inside the router that allows to connect to the device inside the router from the outside.

According to the present invention, even when using DHCP, the server according to the present invention automatically finds and connects with the internal device. I can connect it.

By using a server having a public IP address outside the router and the server according to the present invention, it is possible to automatically access a desired internal computer from the outside without any manual work.

In addition, the internal computer and the external server is not always connected, but is connected only when necessary, and there is almost no load on the external server because data is transmitted and received through the internal server according to the present invention.

1 is a flowchart showing an operation sequence of an internal server according to the present invention.
1 is a system configuration diagram using an internal server according to the present invention.

First, the terms are defined as follows.

Router: Internet Router

Internal computer: Computer with private IP address existing in router

External computer: A computer that exists outside the router

Internal server: Server with private IP address existing in router

External Server: Server with public IP address that exists outside router

The computer consists of an external connection, an internal connection and a connection connecting both.

The external connection is a part that can directly connect to the external Internet using the port forwarding function of the router.

The internal connector is the part that connects to the computers inside the router.

Of course, the external and internal connections are not physically separate, but are connected to the router via a single LAN.

The controller plays the following roles.

When the internal computer transmits its ID information and port number to access itself through the internal connection, it stores the transmitted ID information, the private IP address of the connected internal computer, and the transmitted port number.

When the external computer connects through the router and sends the IP address and port number of the internal computer to be connected, it connects to the corresponding port number of the corresponding internal computer.

When an external computer connects through a router and transmits ID information of the internal computer to be connected, it searches for a corresponding IP address and port number from the stored data and connects to the corresponding port number of the corresponding internal computer.

The connection unit then serves as a relay for transferring data from the internal computer to the external computer and transferring data from the external computer to the internal computer.

The present invention will be described in detail by taking the connection between computers as an example.

First, the server assigns a fixed IP address, not DHCP, and sets up to connect to the server when connecting to a specific port using the router's port forwarding function.

There may be a number of ways to implement the invention.

First of all, you can publish only to internal server without revealing its IP address and port number to external server and external computer as follows.

In the first step, the internal computer transmits ID information to identify itself by accessing the internal server and a port number used to access itself, and the internal server transmits the private IP address and transmitted information of the internal computer connected to itself. Save it.

In the second step, the internal computer or the internal server transmits ID information for identifying the internal computer by connecting to the external server, the port forwarding port number of the router, and the external server is transmitted with the public IP address of the router connected to the external server. Save the information.

In the third step, the external computer connects to the external server and transmits the ID of the computer to be connected, and the external server returns the router's IP address and port forwarding port number from the ID information.

Step 4, when the external computer accesses the returned router's IP address and port forwarding port number, the router connects to the internal server by the router's port forwarding function.

Step 5, the external computer transmits ID information of the computer to be connected to the internal server, and the internal server retrieves the IP address and port number of the internal computer from the ID information and connects to the internal computer.

In the sixth step, the internal server operates as a relay server that transmits data of both sides.

Second, you can reveal your IP address and port number to external servers and computers as follows.

In the first step, the internal computer transmits ID information to identify itself by accessing an external server, port forwarding port number of the router, its own private IP address, and a port number used to access itself, and the external server sends it to itself. Store the public IP address of the connected router and the transmitted information.

In the second step, the external computer accesses the external server and transmits the ID of the computer to be connected. The external server returns the router's IP address, port forwarding port number, IP address and port number of the internal computer to be connected from the ID information.

In the third step, when the external computer accesses the returned router's IP address and port forwarding port number, it connects to the internal server by the router's port forwarding function.

Step 4, the external computer transmits the IP address and port number of the computer to be connected to the internal server, and the internal server connects to the internal computer.

In the fifth step, the internal server acts as a relay server that transmits both data to each other.

You can make this function integrated with your router.

The description is an embodiment of the invention, and various modifications are possible.

1: control unit, 2: external connection, 3: internal connection

Claims (4)

The internal server device of the router which exists in the internal network of the router and has the ability to connect to the designated device from the inside of the router from the outside.
In paragraph 1
Functionally
An external connection for connecting to the external Internet;
An internal connection part for connecting with an internal device;
A control unit which connects to an internal device through an internal connection unit and transmits both data to a counterpart upon request from the outside through an external connection unit;
Router internal server device, characterized in that consisting of
In paragraph 1
When the internal device sends the ID information to identify itself by connecting to the internal server and the port number to use when accessing itself, the internal server stores the ID information, the IP address of the connected internal device, and the transmitted port number. ;
When the internal device or internal server sends ID information to identify the internal device by connecting to the external server and the port forwarding port number of the router, the external server sends the ID information, the public IP address of the shared connection, and the transmitted port number. step;
An external device accesses an external server and transmits an ID, and the external server returns an IP address and a port number of the router from the ID information;
Connecting to an internal server via a router when the external device accesses the returned IP address and port number;
If the external device transmits the ID information to the internal server, the internal server accesses the IP address and port number of the internal device from the ID information;
Thereafter, the internal server acts as a relay server for transferring both data to each other step 6;
Router internal server device, characterized in that the operation
In paragraph 1
If the internal device sends ID information to identify itself by accessing the external server, port forwarding port number of the router, its own private IP address and port number to use for accessing itself, the public IP address of the router connected to the external server. Storing the transmitted information with the first step;
An external device accesses an external server and transmits an ID, and the external server returns from the ID information the IP address and port number of the router and the IP address and port number of the internal device;
Connecting to the internal server via the router when the external device accesses the returned router IP address and port number;
Step 4, when the external device sends the IP address and port number of the internal device to access the internal server, the internal server is connected to the corresponding internal device;
Thereafter, the internal server acts as a relay server for transferring both data to each other;
Router internal server device, characterized in that the operation

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