CN110730237A - Data transmission method, device, system and equipment - Google Patents

Abstract

The present application discloses a data transmission method. The present application also discloses a data transmission device, system and device. In the method disclosed in this application, 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 use the public IP address of the data sender according to the data sender. The sending port used when sending data with the data sending end correctly forwards the data to be returned to the data sending end, thus completing the data reply based on the same communication link. Among them, the present application completes the mutual communication between the data sending end and the data receiving end without adding new communication, thereby reducing the communication cost and avoiding the waste of communication resources.

Description

A data transmission method, device, system and equipment

technical field

The present application relates to the field of communication technologies, and in particular, to a data transmission method, apparatus, system, and device.

Background technique

In the prior art, 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 the intranet node 2. However, since the external network node or the intranet node 1 without proxy node can only transmit data to the proxy node, and the proxy node cannot return data, the intranet node 2 cannot return the corresponding data after receiving the data.

Among them, 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 newly established communication link of the internal network node 2 returns the corresponding data. When the data sender is an intranet node 1 without a proxy node, if the intranet node 2 needs 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 corresponding data, it is necessary to re-establish a communication link or set a proxy node for the data sending end, that is, a new communication device needs to be added. Among them, since the cost of communication equipment is relatively expensive, the new communication equipment will increase the communication cost; at the same time, after the new communication equipment is added, the function of the newly added communication equipment is only to return data, and its utilization rate is low, which will cause communication resources. of waste.

SUMMARY OF THE INVENTION

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

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

If receiving the first data sent by the target network node, 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 for sending the first data by the target network node;

The target network node is an external network node, or a node that is on 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;

Forward the first data 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 the sending port, and send the public network IP address, the 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 for sending the first data by the target network node, including:

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

According to the public network IP address and sending port returned by the target network node, the second data is forwarded 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:

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;

A second forwarding module, 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;

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

Preferably, the first forwarding module includes:

an acquisition unit for acquiring 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 the preset mapping table;

The first forwarding unit is used for forwarding the first data to the target network node by using the socket connection.

Preferably, the first forwarding module is specifically used for:

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.

Preferably, the second forwarding module includes:

a receiving unit, configured to receive the second data, the public network IP address and the 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.

In order to achieve the above object, the present application further provides 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 on the same network as the target network node but does not have an agent node;

an object network node for sending the first data to the target proxy node;

a target network node for returning 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, forward the first 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 The second data to the target network node.

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

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

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

memory for storing computer programs;

The processor is used for executing the computer program to realize 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 the computer program implements the data transmission method disclosed above when executed by a processor.

It can be seen from the above solutions that the present application provides a data transmission method, which is applied to a target proxy node of a 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 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 on the same network as the target network node but does not have an agent node.

In the above method, 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 return the data corresponding to the current data. The public IP address of the sending end and the sending port used by the data sending end to send data determine which node to forward the received returned data to, so the proxy node can correctly forward the data to be returned to the data sending end. A communication link completes the data reply. That is, 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 a new communication device, 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 technical effects.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only It is an embodiment of the present application. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without any creative effort.

1 is a flowchart of a first data transmission method disclosed in the application;

2 is a flowchart of a second data transmission method disclosed in the application;

3 is a flowchart of a third data transmission method disclosed in this application;

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

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

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

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

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

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It is to be understood that data so used may be interchanged under appropriate circumstances so that the embodiments described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

It should be noted that the descriptions involving "first", "second", etc. in this application are only for the purpose of description, and should not be construed as indicating or implying their relative importance or implying the number of indicated technical features . Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist. , is not within the scope of protection claimed in this application.

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

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

S102, forward the first data to the target network node;

S103, receiving 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 for sending the first data by the target network node.

In this embodiment, the target network node is an external network node, or a node that is on 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 can use the public network IP of the target network node according to 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. The public network IP address of the target network node is the IP address displayed externally by the target network node.

Specifically, when the target network node is on 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 use the public IP address of the target network node according to the target network node. 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 the target network node in this embodiment 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 return the data corresponding to the current data. The public IP address of the sending end and the sending port used by the data sending end to send data determine which node to forward the received returned data to, so the proxy node can correctly forward the data to be returned to the data sending end. A communication link completes the data reply. That is, 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 a new communication device, 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 by an embodiment of the present application. In the second embodiment, the method is applied to the target proxy node of the target network node, including:

S201. Receive first data sent by an object 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, receiving 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 for sending the first data by the target network node.

In this embodiment, the target network node is an external network node, or a node that is on 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: the target network node knows the ID of the target network node, so the target network node can send the ID of the target network node and the first data to be sent. Sent to the target agent node.

Specifically, the target proxy node maintains a mapping table, and the mapping table records the corresponding relationship between the node ID and the socket connection. Therefore, when the target proxy node receives the ID and the first data of the target network node, 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 proxy node may also be the proxy 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 of 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. address, sending port and first data to the target network node; when the target network node returns the second data, it also returns the public network IP address and sending port, so that the target proxy node can forward the data according to the public network IP address and sending port data to object network nodes.

Since the target proxy node can also proxy 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 The target agent node performs data interaction. In this way, the mutual communication between the data sending end and the data receiving end is realized without adding a new communication device.

It should be noted that, other implementation steps in this embodiment are the same as or similar to the above-mentioned embodiments, and thus are not described again in this embodiment.

It can be seen from the above that the target network node in this embodiment 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 return the data corresponding to the current data. The public IP address of the sending end and the sending port used by the data sending end to send data determine which node to forward the received returned data to, so the proxy node can correctly forward the data to be returned to the data sending end. A communication link completes the data reply. That is, 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 a new communication device, 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 by an embodiment of the present application. In three embodiments, the method is applied to the target proxy node of the target network node, including:

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

S302, determining the public network IP address of the target network node and the sending port for sending the first data by the target network node;

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

S304, receiving 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 on the same network as the target network node but does not have an agent node.

In order to reduce the load of 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 for sending the first data by the target network node, 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 also returns the public network IP address and sending port, so that the target network node returns the second data. 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 more nodes to maintain the return data path, 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 avoid the target proxy node maintenance return A situation where the load on the data path is too high.

It should be noted that, other implementation steps in this embodiment are the same as or similar to the above-mentioned embodiments, and thus are not described again in this embodiment. 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 addresses and sending ports submitted in this specification are the IP addresses and ports used by the target network node to send the first data.

It can be seen from the above that the target network node in this embodiment 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 sending end sends data to the proxy node, the proxy node sends the public IP address, sending port and data to the data receiving end after determining the public network IP address and sending port of the data sending end; when the data receiving end returns the corresponding data When the public network IP address, sending port and return data are returned to the proxy node, the proxy node can forward the return 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 maintenance of the public network IP address and the sending port by the proxy node is also avoided, the load of the proxy node is not increased, and the normal operation of the proxy node is not affected. That is, 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 a new communication device, thereby reducing the communication cost and avoiding the waste of communication resources.

The following describes a data transmission apparatus provided by an embodiment of the present application. A data transmission apparatus described below and a data transmission method described above may be referred to each other.

Referring to FIG. 4 , FIG. 4 is a schematic diagram of a data transmission apparatus 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;

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

In a specific embodiment, the first forwarding module includes:

an acquisition unit for acquiring 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 the preset mapping table;

The first forwarding unit is used for forwarding the first data to the target network node by using the socket connection.

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

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.

In a specific embodiment, the second forwarding module includes:

a receiving unit, configured to receive the second data, the public network IP address and the 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, which will not be repeated here.

It can be seen that this embodiment provides a data transmission apparatus, 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, each module divides labor and cooperates, and each performs its own duties, thus completing the data reply based on the same communication link, and completing the mutual communication between the data sender and the data receiver without adding new communication equipment, thereby reducing the communication cost. , and also avoid the waste of communication resources.

The following describes a data transmission system provided by an embodiment of the present application, and a data transmission system described below and a data transmission method and apparatus described above can be referred 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: a target 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 on the same network as the target network node but does not have an agent node;

an object network node for sending the first data to the target proxy node;

a target network node for returning 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, forward the first 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 The second data to the target network node.

In a specific embodiment, 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 object network node is the UDP port, and the port facing the target network node is the 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 uses the ID and 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.

The following describes a data transmission device provided by an embodiment of the present application. The data transmission device described below and the data transmission method, device, and system described above can be referred 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 apparatus includes:

memory 601, used to save computer programs;

The processor 602 is configured to execute the computer program to implement the method disclosed in any of the foregoing embodiments. For the specific steps of the method, reference may be made to the corresponding content disclosed in the foregoing embodiments, which will not be 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 .

The memory 11 includes at least one type of readable storage medium, including flash memory, hard disk, multimedia card, card-type memory (eg, SD or DX memory, etc.), magnetic memory, magnetic disk, optical disk, and the like. The memory 11 may in some embodiments be an internal storage unit of the data transmission device, such as a hard disk of the data transmission device. In other embodiments, the memory 11 may also be an external storage device of the data transmission device, 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 card (Flash Card) and so on. 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 be used not only to store application software installed in the data transmission device and various types of data, such as codes of data transmission programs, etc., but also to temporarily store data that has been output or will be output.

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

The bus 13 may be a peripheral component interconnect (PCI for short) bus or an extended industry standard architecture (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 presentation, 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 may also include a network interface, and the network interface may optionally include a wired interface and/or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which is usually used between the device and other electronic devices Establish a communication connection.

Optionally, the device may further include a user interface, and the user interface may include a display (Display), an input unit such as a keyboard (Keyboard), and an optional user interface may further include a standard wired interface and a wireless interface. 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 device, and the like. Among them, the display may also be appropriately referred to as a display screen or a display unit for displaying information processed in the device and for displaying a visual user interface.

FIG. 7 only shows a data transmission device with components 11-13. Those skilled in the art can understand that the structure shown in FIG. 7 does not constitute a limitation on the device, and may include fewer or more than shown in the figure. components, or a combination of certain components, or a different arrangement of components.

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

A readable storage medium for storing a computer program, wherein when the computer program is executed by a processor, the data transmission method disclosed in the foregoing embodiments is implemented. For the specific steps of the method, reference may be made to the corresponding content disclosed in the foregoing embodiments, which will not be repeated here.

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

The steps of a method or algorithm described in conjunction with the embodiments disclosed herein may be directly implemented in hardware, a software module executed by a processor, or a combination of the two. A software module 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 in the technical field. in any other form of readable storage medium that is well known.

The principles and implementations of the present application are described herein by using specific examples. The descriptions of the above embodiments are only used to help understand the methods and core ideas of the present application. There will be changes in the specific implementation and application scope. To sum up, the content of this specification should not be construed as a limitation to the application.

Claims (10)

1. a data transmission method, is characterized in that, is applied to the target proxy node of target network node, comprises: If receiving the first data sent by the target network node, forwarding the first data to the target network node; Receive the second data returned by the target network node, and forward the second data to the object 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; 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. 2. The data transmission method according to claim 1, wherein the forwarding the first data to the target network node comprises: 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. 3. The data transmission method according to claim 1, wherein the forwarding the first data to the target network node comprises: The public network IP address and the sending port are determined, and the public network IP address, the sending port and the first data are sent to the target network node. 4. The data transmission method according to claim 3, wherein the receiving the second data returned by the target network node and sending the data according to the public network IP address of the target network node and the target network node The sending port of the first data, forwarding the second data to the target network node, includes: receiving the second data, the public network IP address and the sending port returned by the target network node; The second data is forwarded to the target network node according to the public network IP address and the sending port returned by the target network node. 5. A data transmission device, characterized in that the target proxy node applied to the target network node comprises: 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 for sending the first data by the target network node. second data to the object network node; 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. 6. 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, configured to send the first data to the target proxy node; the target network node, for returning second data to the target proxy node; The target proxy node is configured to forward the first data to the target network node; if receiving the second data returned by the target network node, 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. 7 . The data transmission system according to claim 6 , wherein the object network node and the target proxy node communicate through a UDP protocol. 8 . 8. The data transmission system according to claim 7, wherein the target network node and the target proxy node communicate through TCP protocol. 9. A data transmission device, characterized in that, comprising: memory for storing computer programs; A processor for executing the computer program to implement the data transmission method according to any one of claims 1 to 4. 10 . The data transmission device according to claim 9 , wherein the data transmission device is a node forming a CDN network or a blockchain network. 11 .

Images