CN110730237B - Data transmission method, device, system and equipment - Google Patents

Abstract

The application discloses a data transmission method. The application also discloses a data transmission device, a system and equipment. In the method disclosed by the application, the target network node is a data sending end, the target network node is a data receiving end, and the target agent node is an agent of the target network node. When the data sending end sends data to the data receiving end through the proxy node, the data receiving end needs to return corresponding data, the data receiving end can firstly return the data needing to be returned to the proxy node, and then the proxy node can correctly forward the data needing to be returned to the data sending end according to the public network IP address of the data sending end and a sending port used when the data sending end sends the data, so that data reply is completed based on the same communication link. According to the method and the device, the mutual communication between the data sending end and the data receiving end is completed without adding new communication, so that the communication cost is reduced, and the waste of communication resources is avoided.

Description

A data transmission method, device, system and equipment

technical field

The present application relates to the technical field of communications, and in particular to a data transmission method, device, system and equipment.

Background technique

In the existing technology, when an external network node or an internal network node 1 without a proxy node needs to send data to the internal network node 2, the data can be sent to the proxy node of the internal network node 2 first, and the proxy node forwards the data to intranet node 2. However, since the external network node or the internal network node 1 without proxy node can only transmit data to the proxy node, the proxy node cannot return the data, so the internal network node 2 cannot return the corresponding data after receiving the data.

Wherein, when the data sending end is an external network node, if the internal network node 2 needs to return corresponding data, a communication link needs to be re-established so that the internal network node 2 communicates with the newly established communication link to return corresponding data. When the data sender is an intranet node 1 without a proxy node, if the intranet node 2 is required to return corresponding data, a corresponding proxy node needs to be set for the intranet node 1.

It can be seen that in the existing communication scheme, if the data receiving end needs to return the corresponding data, it is necessary to re-establish the communication link or set up a proxy node for the data sending end, that is, it is necessary to add new communication equipment. Among them, since the cost of communication equipment is relatively expensive, adding new communication equipment will increase the cost of communication; at the same time, after adding new communication equipment, the function of the new communication equipment is only to return data, and its utilization rate is low, which will cause communication resources waste.

Contents of the invention

The main purpose of this application is to provide a data transmission method, device, system and equipment, aiming to solve the technical problems of high communication cost and waste of communication resources in existing communication solutions.

In order to achieve the above purpose, this application provides a data transmission method, which is applied to the target proxy node of the target network node, including:

If the first data sent by the target network node is received, forwarding the first data to the target network node;

receiving the second data returned by the target network node, and forwarding the second data to the target network node according to the public network IP address of the target network node and the sending port of the target network node for sending the first data;

Wherein, the target network node is an external network node, or a node that is in the same network as the target network node but does not have an agent node.

Preferably, forwarding the first data to the target network node includes:

Obtain the ID of the target network node from the first data;

Query the socket connection corresponding to the ID of the target network node in the preset mapping table;

The first data is forwarded to the target network node using the socket connection.

Preferably, forwarding the first data to the target network node includes:

Determine the public network IP address and sending port, and send the public network IP address, sending port and the first data to the target network node.

Preferably, receiving the second data returned by the target network node, and forwarding the second data to the target network node according to the public network IP address of the target network node and the sending port of the target network node for sending the first data, includes:

receiving the second data, public network IP address and sending port returned by the target network node;

According to the public network IP address and sending port returned by the target network node, forward the second data to the target network node.

In order to achieve the above purpose, the present application further provides a data transmission device, which is applied to the target proxy node of the target network node, including:

The first forwarding module is configured to forward the first data to the target network node if the first data sent by the target network node is received;

The second forwarding module is configured to receive the second data returned by the target network node, and forward the second data to the target network node according to the public network IP address of the target network node and the sending port for sending the first data by the target network node;

Wherein, the target network node is an external network node, or a node that is in the same network as the target network node but does not have an agent node.

Preferably, the first forwarding module includes:

an obtaining unit, configured to obtain the ID of the target network node from the first data;

a query unit, configured to query the socket connection corresponding to the ID of the target network node in a preset mapping table;

The first forwarding unit is configured to forward the first data to the target network node through the socket connection.

Preferably, the first forwarding module is specifically used for:

Determine the public network IP address and sending port, and send the public network IP address, sending port and the first data to the target network node.

Preferably, the second forwarding module includes:

A receiving unit, configured to receive the second data, public network IP address and sending port returned by the target network node;

The second forwarding unit is configured to forward the second data to the target network node according to the public network IP address and the sending port returned by the target network node.

To achieve the above purpose, the present application further provides a data transmission system, including: a target network node, a target network node, and a target proxy node of the target network node, wherein:

The target network node is an external network node, or a node that is in the same network as the target network node but does not have an agent node;

The object network node is used to send the first data to the target proxy node;

The target network node is used to return the second data to the target proxy node;

The target proxy node is used to forward the first data to the target network node; if the second data returned by the target network node is received, then forward the first data according to the public network IP address of the target network node and the sending port of the target network node to send the first data The second data is sent to the target network node.

Preferably, the target network node and the target proxy node communicate through UDP protocol.

Preferably, the target network node and the target proxy node communicate through TCP protocol.

To achieve the above purpose, the present application further provides a data transmission device, including:

memory for storing computer programs;

A processor, configured to execute a computer program to implement the data transmission method disclosed above.

Preferably, the data transmission device is a node forming a CDN network or a blockchain network.

To achieve the above object, the present application further provides a readable storage medium for storing a computer program, wherein, when the computer program is executed by a processor, the aforementioned disclosed data transmission method is realized.

It can be seen from the above scheme that the present application provides a data transmission method, which is applied to the target proxy node of the target network node, including: if the first data sent by the target network node is received, forwarding the first data to the target network node; receiving The second data returned by the target network node, and forwarding the second data to the target network node according to the public network IP address of the target network node and the sending port of the target network node for sending the first data; wherein, the target network node is an external network node, Or a node that is in the same network as the target network node but does not have an agent node.

In the above method, the target network node is a data sending end, the target network node is a data receiving end, and the target proxy node is an agent of the target network node. When the data sender sends data to the data receiver through the proxy node, and the data receiver needs to return the corresponding data, the data receiver can first return the data to be returned to the proxy node, and then the proxy node can The public network IP address of the sender and the sending port used by the data sender to send data determine which node to forward the received return data to, so the proxy node can correctly forward the data to be returned to the data sender, thus based on the same A communication link completes the data reply. That is to say, on the basis of the existing communication scheme, the present application completes the mutual communication between the data sending end and the data receiving end without adding new communication equipment, thereby reducing the communication cost and avoiding the waste of communication resources.

Correspondingly, a data transmission device, system, and equipment provided by the present application also have the above-mentioned technical effects.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present application, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

FIG. 1 is a flow chart of the first data transmission method disclosed in the present application;

FIG. 2 is a flow chart of the second data transmission method disclosed in the present application;

FIG. 3 is a flowchart of a third data transmission method disclosed in the present application;

FIG. 4 is a schematic diagram of a data transmission device disclosed in the present application;

FIG. 5 is a schematic diagram of a data transmission system disclosed in the present application;

FIG. 6 is a schematic diagram of a data transmission device disclosed in the present application;

FIG. 7 is a schematic diagram of another data transmission device disclosed in the present application.

The realization, functional features and advantages of the present application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and not necessarily Used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

It should be noted that the descriptions in this application involving "first", "second" and so on are for descriptive purposes only, and should not be understood as indicating or implying their relative importance or implicitly indicating the number of indicated technical features . Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present application.

Referring to FIG. 1 , FIG. 1 is a flowchart of a first data transmission method disclosed in an embodiment of the present application. In an embodiment, the method is applied to a target proxy node of a target network node, comprising:

S101. Receive first data sent by an object network node;

S102. Forward the first data to the target network node;

S103. Receive the second data returned by the target network node;

S104. Forward the second data to the target network node according to the public network IP address of the target network node and the sending port through which the target network node sends the first data.

In this embodiment, the target network node is an external network node, or a node that is in the same network as the target network node but does not have an agent node.

In this embodiment, when the target network node needs to return the second data to the target network node, the target network node first returns the second data to its own target proxy node, so that the target proxy node The address and the sending port of the target network node to send the first data, and forward the second data to the target network node. Wherein, the public network IP address of the target network node is an IP address displayed externally by the target network node.

Specifically, when the target network node is in the same network as the target network node but does not have a proxy node, then when the target network node returns the second data, the target proxy node can The sending port for sending the first data with the target network node determines the receiving end of the second data, so as to transmit the second data to the target network node.

Specifically, when the target network node is an external network node, when the target network node returns the second data, the target proxy node can determine the network where the target network node is located according to the public network IP address of the target network node, and then according to the target network node The sending port through which the node sends the first data determines the receiving end of the second data, so as to transmit the second data to the target network node.

It can be seen from the above that in this embodiment, the target network node is the data sending end, the target network node is the data receiving end, and the target proxy node is the proxy of the target network node. When the data sender sends data to the data receiver through the proxy node, and the data receiver needs to return the corresponding data, the data receiver can first return the data to be returned to the proxy node, and then the proxy node can The public network IP address of the sender and the sending port used by the data sender to send data determine which node to forward the received return data to, so the proxy node can correctly forward the data to be returned to the data sender, thus based on the same A communication link completes the data reply. That is to say, on the basis of the existing communication scheme, the present application completes the mutual communication between the data sending end and the data receiving end without adding new communication equipment, thereby reducing the communication cost and avoiding the waste of communication resources.

Referring to FIG. 2 , FIG. 2 is a flowchart of a second data transmission method disclosed in an embodiment of the present application. In a second embodiment, the method is applied to a target proxy node of a target network node, including:

S201. Receive the first data sent by the target network node;

S202. Obtain the ID of the target network node from the first data;

S203. Query the socket connection corresponding to the ID of the target network node in the preset mapping table;

S204. Using the socket connection to forward the first data to the target network node;

S205. Receive the second data returned by the target network node;

S206. Forward the second data to the target network node according to the public network IP address of the target network node and the sending port through which the target network node sends the first data.

In this embodiment, the target network node is an external network node, or a node that is in the same network as the target network node but does not have an agent node.

Specifically, the reason why the target network node can send data to the target network node through the target proxy node is that the target network node knows the ID of the target network node, so the target network node can combine the ID of the target network node and the first data to be sent. sent to the target proxy node.

Specifically, the target proxy node maintains a mapping table, and the mapping table records the corresponding relationship between node IDs and socket connections. Therefore, when the target proxy node receives the ID of the target network node and the first data, it can query the socket connection corresponding to the ID of the target network node from the mapping table, and then use the socket connection to forward the first data to the target network node.

It should be noted that the target agent node may also be an agent of other nodes, so the mapping table also records other node IDs and corresponding socket connections. The node ID is the unique identification of the node in the network.

It should be noted that, in order to reduce the load on the proxy node, after receiving the first data, the target proxy node may not maintain the public network IP address and sending port for sending the first data, but use the socket connection to forward the public network IP address, sending port and the first data to the target network node; when the target network node returns the second data, it will also return the public network IP address and sending port, so that the target proxy node can forward according to the public network IP address and sending port data to object network nodes.

Since the target proxy node can also act as an agent for other nodes, the target network node can be mounted to the target proxy node, so that the target network node and the target network node have a common proxy node, so that the target network node and the target network node can pass The target proxy node performs data interaction. In this way, the mutual communication between the data sending end and the data receiving end can be completed without adding new communication equipment.

It should be noted that other implementation steps in this embodiment are the same as or similar to those in the foregoing embodiment, so details will not be repeated here in this embodiment.

It can be seen from the above that in this embodiment, the target network node is the data sending end, the target network node is the data receiving end, and the target proxy node is the proxy of the target network node. When the data sender sends data to the data receiver through the proxy node, and the data receiver needs to return the corresponding data, the data receiver can first return the data to be returned to the proxy node, and then the proxy node can The public network IP address of the sender and the sending port used by the data sender to send data determine which node to forward the received return data to, so the proxy node can correctly forward the data to be returned to the data sender, thus based on the same A communication link completes the data reply. That is to say, on the basis of the existing communication scheme, the present application completes the mutual communication between the data sending end and the data receiving end without adding new communication equipment, thereby reducing the communication cost and avoiding the waste of communication resources.

Referring to FIG. 3 , FIG. 3 is a flowchart of a third data transmission method disclosed in an embodiment of the present application. In three embodiments, the method is applied to a target proxy node of a target network node, including:

S301. Receive first data sent by an object network node;

S302. Determine the public network IP address of the target network node and the sending port through which the target network node sends the first data;

S303. Send the public network IP address, the sending port and the first data to the target network node;

S304. Receive the second data, the public network IP address, and the sending port returned by the target network node;

S305. Forward the second data to the target network node according to the public network IP address and the sending port returned by the target network node.

In this embodiment, the target network node is an external network node, or a node that is in the same network as the target network node but does not have an agent node.

In order to reduce the load on the proxy node, after the target proxy node receives the first data and determines the public network IP address of the target network node and the sending port of the target network node to send the first data, it may not maintain the public network for sending the first data IP address and sending port, but send the public network IP address, sending port and first data to the target network node; when the target network node returns the second data, it will also return the public network IP address and sending port, so that the target The proxy node can forward data to the target network node according to the public network IP address and sending port.

Among them, if the target proxy node has many nodes and makes it maintain the path of returning data, it may increase the load of the target proxy node and affect its normal operation. Therefore, the method provided by this embodiment can be used to prevent the target proxy node from maintaining and returning High load conditions caused by the data path.

It should be noted that other implementation steps in this embodiment are the same as or similar to those in the foregoing embodiment, so details will not be repeated here in this embodiment. Wherein, the target network node replies with data after receiving the data sent by the target network node, and generally cannot actively send data to the target network node. The public network IP address and sending port submitted in this specification are the IP address and port used by the object network node when sending the first data.

It can be seen from the above that in this embodiment, the target network node is the data sending end, the target network node is the data receiving end, and the target proxy node is the agent of the target network node. When the data sender sends data to the proxy node, the proxy node sends the public network IP address, send port and data to the data receiver after determining the public network IP address and sending port of the data sender; when the data receiver returns the corresponding data When the public network IP address, sending port and return data are all returned to the proxy node, then the proxy node can forward the returned data to the data sending end according to the received public network IP address and sending port. Therefore, the data reply is completed based on the same communication link, and the proxy node is prevented from maintaining the public network IP address and the sending port. The load on the proxy node is not increased, and the normal operation of the proxy node is not affected. That is to say, on the basis of the existing communication scheme, the present application completes the mutual communication between the data sending end and the data receiving end without adding new communication equipment, thereby reducing the communication cost and avoiding the waste of communication resources.

A data transmission device provided in an embodiment of the present application is introduced below, and a data transmission device described below and a data transmission method described above may refer to each other.

Referring to FIG. 4 , FIG. 4 is a schematic diagram of a data transmission device disclosed in an embodiment of the present application. In the fourth embodiment, the target proxy node applied to the target network node includes:

The first forwarding module 401 is configured to forward the first data to the target network node if the first data sent by the target network node is received;

The second forwarding module 402 is configured to receive the second data returned by the target network node, and forward the second data to the target network node according to the public network IP address of the target network node and the sending port for sending the first data by the target network node;

Wherein, the target network node is an external network node, or a node that is in the same network as the target network node but does not have an agent node.

In a specific implementation manner, the first forwarding module includes:

an obtaining unit, configured to obtain the ID of the target network node from the first data;

a query unit, configured to query the socket connection corresponding to the ID of the target network node in a preset mapping table;

The first forwarding unit is configured to forward the first data to the target network node through the socket connection.

In a specific implementation manner, the first forwarding module is specifically used for:

Determine the public network IP address and sending port, and send the public network IP address, sending port and the first data to the target network node.

In a specific implementation manner, the second forwarding module includes:

A receiving unit, configured to receive the second data, public network IP address and sending port returned by the target network node;

The second forwarding unit is configured to forward the second data to the target network node according to the public network IP address and the sending port returned by the target network node.

For the more specific working process of each module and unit in this embodiment, reference may be made to the corresponding content disclosed in the foregoing embodiments, and details are not repeated here.

It can be seen that this embodiment provides a data transmission device, including: a first forwarding module and a second forwarding module. If the first data sent by the target network node is received, the first forwarding module first forwards the first data to the target network node; the second forwarding module receives the second data returned by the target network node, and according to the public network IP of the target network node The address and the sending port of the target network node to send the first data, and forward the second data to the target network node. In this way, the various modules cooperate with each other and perform their own duties, thus completing the data reply based on the same communication link. At the same time, the mutual communication between the data sending end and the data receiving end is completed without adding new communication equipment, thereby reducing the communication cost. , also avoiding the waste of communication resources.

A data transmission system provided by an embodiment of the present application is introduced below, and a data transmission system described below and a data transmission method and device described above may refer to each other.

Referring to FIG. 5 , FIG. 5 is a schematic diagram of a data transmission system disclosed in an embodiment of the present application. In the fifth embodiment, the system includes: an object network node 501, a target network node 502, and a target proxy node 503 of the target network node, wherein:

The target network node is an external network node, or a node that is in the same network as the target network node but does not have an agent node;

The object network node is used to send the first data to the target proxy node;

The target network node is used to return the second data to the target proxy node;

The target proxy node is used to forward the first data to the target network node; if the second data returned by the target network node is received, then forward the first data according to the public network IP address of the target network node and the sending port of the target network node to send the first data The second data is sent to the object network node.

In a specific implementation manner, the target network node and the target proxy node communicate through the UDP protocol. The target network node and the target proxy node communicate through the TCP protocol. That is to say, the port of the target proxy node facing the target network node is a UDP port, and the port facing the target network node is a TCP port. The sending port through which the target network node sends the first data is a UDP port.

When the target network node starts to go online, the target network node can establish a TCP long connection with the target proxy node (connection is maintained through heartbeat), and then the target network node sends its own ID to the target proxy node, and the target proxy node combines the ID with the TCP The socket connection establishes a mapping relationship and stores it in the mapping table, so that after receiving the first data, the receiving end of the first data is determined according to the mapping table.

A data transmission device provided by an embodiment of the present application is introduced below. The data transmission device described below and the data transmission method, device, and system described above may refer to each other.

Referring to FIG. 6, FIG. 6 is a schematic diagram of a data transmission device disclosed in an embodiment of the present application. In six embodiments, the device includes:

Memory 601, used to store computer programs;

The processor 602 is configured to execute the computer program, so as to implement the method disclosed in any of the foregoing embodiments. Regarding the specific steps of the method, reference may be made to the corresponding content disclosed in the foregoing embodiments, and details are not repeated here.

The data transmission device may be a node forming a CDN (Content Delivery Network) network or a blockchain network.

Referring to FIG. 7 , FIG. 7 is a schematic diagram of another data transmission device disclosed in an embodiment of the present application. The data transmission device may include a memory 11 , a processor 12 and a bus 13 .

Wherein, the memory 11 includes at least one type of readable storage medium, and the readable storage medium includes flash memory, hard disk, multimedia card, card-type memory (eg, SD or DX memory, etc.), magnetic memory, magnetic disk, optical disk, etc. The memory 11 may be an internal storage unit of the data transmission device in some embodiments, such as a hard disk of the data transmission device. Memory 11 may also be an external storage device of the data transmission device in other embodiments, such as a plug-in hard disk equipped on the data transmission device, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, flash memory card (Flash Card), etc. Further, the memory 11 may also include both an internal storage unit of the data transmission device and an external storage device. The memory 11 can not only be used to store application software and various data installed in the data transmission device, such as the code of the data transmission program, but also can be used to temporarily store the data that has been output or will be output.

In some embodiments, the processor 12 may be a central processing unit (Central Processing Unit, CPU), a controller, a microcontroller, a microprocessor, or other data processing chips for running program codes or processing stored in the memory 11. data, such as executing data transfer programs, etc.

The bus 13 may be a peripheral component interconnect standard (PCI for short) bus or an extended industry standard architecture (EISA for short) bus or the like. The bus can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 7 , but it does not mean that there is only one bus or one type of bus.

Further, the data transmission device can also include a network interface, and the network interface can optionally include a wired interface and/or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which are usually used for communication between the device and other electronic devices. Establish a communication connection.

Optionally, the device may further include a user interface. The user interface may include a display (Display) and an input unit such as a keyboard (Keyboard). Optional user interfaces may also include standard wired interfaces and wireless interfaces. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode, Organic Light-Emitting Diode) touch panel, and the like. Wherein, the display may also be properly referred to as a display screen or a display unit, and is used for displaying information processed in the device and for displaying a visualized user interface.

Figure 7 only shows a data transmission device with components 11-13, and those skilled in the art can understand that the structure shown in Figure 7 does not constitute a limitation on the device, and may include fewer or more components, or combinations of certain components, or different arrangements of components.

A readable storage medium provided by an embodiment of the present application is introduced below, and a readable storage medium described below and a data transmission method, device, system, and device described above may refer to each other.

A readable storage medium is used to store a computer program, wherein when the computer program is executed by a processor, the data transmission method disclosed in the foregoing embodiments is implemented. Regarding the specific steps of the method, reference may be made to the corresponding content disclosed in the foregoing embodiments, and details are not repeated here.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the differences from other embodiments, and the same or similar parts of each embodiment can be referred to each other

The steps of the methods or algorithms described in connection with the embodiments disclosed herein may be directly implemented by hardware, software modules executed by a processor, or a combination of both. Software modules can be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other Any other known readable storage medium.

In this paper, specific examples are used to illustrate the principles and implementation methods of the application. The descriptions of the above embodiments are only used to help understand the method and core idea of the application; meanwhile, for those of ordinary skill in the art, according to the application There will be changes in the specific implementation and scope of application. In summary, the content of this specification should not be construed as limiting the application.

Claims (7)

1. A data transmission method, characterized in that, being applied to a target proxy node of a target network node, comprising: If the first data sent by the target network node is received, forwarding the first data to the target network node; receiving the second data returned by the target network node, and forwarding the second data to the target according to the public network IP address of the target network node and the sending port for sending the first data by the target network node network node; Wherein, the target network node is an external network node, or a node that is in the same network as the target network node but does not have an agent node; Wherein, receiving the second data returned by the target network node, and forwarding the second data according to the public network IP address of the target network node and the sending port for sending the first data by the target network node To the object network node, including: receiving the second data, the public network IP address and the sending port returned by the target network node; wherein the target proxy node does not maintain the public network IP address and sending port for sending the first data; forwarding the second data to the target network node according to the public network IP address and the sending port returned by the target network node; Wherein, the forwarding the first data to the target network node includes: determining the public network IP address and the sending port, and sending the public network IP address, the sending port and the first data to the target network node; Wherein, mounting the target network node to the target proxy node, so that the target network node and the target network node have a common proxy node; Wherein, the forwarding the first data to the target network node includes: obtaining the ID of the target network node from the first data; Querying the socket connection corresponding to the ID of the target network node in a preset mapping table; Forwarding the first data to the target network node using the socket connection. 2. A data transmission device, characterized in that it is applied to a target proxy node of a target network node, comprising: A first forwarding module, configured to forward the first data to the target network node if the first data sent by the target network node is received; The second forwarding module is configured to receive the second data returned by the target network node, and forward the second data according to the public network IP address of the target network node and the sending port through which the target network node sends the first data second data to the target network node; Wherein, the target network node is an external network node, or a node that is in the same network as the target network node but does not have an agent node; Wherein, the second forwarding module is specifically used for: receiving the second data, the public network IP address and the sending port returned by the target network node; wherein the target proxy node does not maintain the public network IP address and sending port for sending the first data; forwarding the second data to the target network node according to the public network IP address and the sending port returned by the target network node; Wherein, the first forwarding module is specifically used for: determining the public network IP address and the sending port, and sending the public network IP address, the sending port and the first data to the target network node; Wherein, mounting the target network node to the target proxy node, so that the target network node and the target network node have a common proxy node; Wherein, the first forwarding module is specifically used for: obtaining the ID of the target network node from the first data; Querying the socket connection corresponding to the ID of the target network node in a preset mapping table; Forwarding the first data to the target network node using the socket connection. 3. A data transmission system, comprising: an object network node, a target network node, and a target proxy node of the target network node, wherein: The target network node is an external network node, or a node that is in the same network as the target network node but does not have an agent node; The target network node is configured to send the first data to the target proxy node; The target network node is configured to return the second data to the target proxy node; The target proxy node is configured to forward the first data to the target network node; if the second data returned by the target network node is received, according to the public network IP address of the target network node and the The target network node sends the sending port of the first data, and forwards the second data to the target network node; The target proxy node is specifically configured to: receive the second data returned by the target network node, the public network IP address and the sending port; according to the public network IP address returned by the target network node and the The sending port forwards the second data to the target network node; wherein, the target proxy node does not maintain the public network IP address and sending port for sending the first data; Wherein, the target proxy node is specifically configured to: determine the public network IP address and the sending port, and send the public network IP address, the sending port and the first data to the target network node ; Wherein, mounting the target network node to the target proxy node, so that the target network node and the target network node have a common proxy node; Wherein, the target proxy node is specifically used for: obtaining the ID of the target network node from the first data; Querying the socket connection corresponding to the ID of the target network node in a preset mapping table; Forwarding the first data to the target network node using the socket connection. 4. The data transmission system according to claim 3, wherein the target network node and the target proxy node communicate through the UDP protocol. 5. The data transmission system according to claim 4, wherein the target network node and the target proxy node communicate through TCP protocol. 6. A data transmission device, characterized in that, comprising: memory for storing computer programs; A processor, configured to execute the computer program, so as to realize the data transmission method as claimed in claim 1. 7. The data transmission device according to claim 6, wherein the data transmission device is a node forming a CDN network or a block chain network.

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