UDP transmission method and system suitable for distributed network

Abstract

The invention provides a UDP transmission method and system suitable for a distributed network. The system comprises a plurality of network modes. Each network node comprises a transmission module and an upper-layer application module, and each transmission module comprises at least one link unit which comprises a pair of a sending subunit and a receiving subunit, wherein the sending subunit is internally provided with a sending buffer and a sending timer for sending a data packet, storing data or data fragments to be sent into the sending buffer, regularly detecting whether a confirmation character of the corresponding data packet is received by use of the sending timer and regularly retransmitting the data packet in case of receiving failure; and the receiving subunit is internally provided with a receiving buffer and a receiving timer for receiving the data packet, postbakcing the corresponding confirmation character, storing the data fragments into the receiving buffer and regularly detecting whether the data fragments in the same group are completely received by use of the receiving timer. According to the invention, the method and system are designed for a peer-to-peer network, support NAT crossing and provide the object-oriented safe and high-efficiency transmission module.

Description

technical field [0001] The invention relates to the technical field of distributed network communication, in particular to a UDP transmission method and system suitable for distributed networks. Background technique [0002] In peer-to-peer distributed network communication, there is a technical problem about NAT traversal. NAT traversal (NAT traversal) involves a common problem in TCP / IP networks, that is, in private TCP / IP networks using NAT devices The problem of establishing a connection between the hosts. Although there are many techniques for traversing NATs, none of them are perfect because the behavior of NATs is not standardized. Most of these technologies require a public server using a well-known IP address that can be accessed from anywhere in the world. Some methods only need to use this server when establishing a connection, while others relay all data through this server-this introduces the problem of bandwidth overhead. [0003] One idea to solve the probl...

AI Technical Summary

Problems solved by technology

[0004] An important point of the STUN protocol is data transmission based on the UDP protocol. The UDP protocol is oriented to connectionless communication and does not require a three-way handshake. When network devices communicate, UDP data has a higher priority communication right than TCP data, which makes UDP Data is communicated faster, but when the network is congested, the communication device will also give priority to discarding UDP data. This design method will lead to the loss of UDP data. At the same time, the protocol does not stipulate the corresponding flow control method, so naturally it will not Guaranteed ordering of data arrival

In the absence of flow control, UDP data may be lost or arrive out of order. Also due to the lack of flow control, if the development control is not proper, data storm problems may occur

In terms of system driver implementation, when all UDP data is received, a shared data buffer is used, and setting a buffer with an improper size may increase the loss of data packets. This is why the UDP protocol cannot implement a high-concurrency server.

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