Why UDP transmissions lose packets and how to fix it.

UDP is a connectionless protocol, which does not establish a connection when transmitting data, so packet loss may occur. This can be particularly detrimental in the context of b2b file transfer, where timely and accurate data delivery is crucial.

UDP packet loss refers to the phenomenon that data packets cannot reach the destination for various reasons during UDP transmission. This can lead to data loss, delays, and even transmission failures, significantly impacting the efficiency and reliability of b2b file transfer operations.

So, this article will analyze the reasons for UDP packet loss and the corresponding common solutions for reference.

The four reasons for UDP packet loss are as follows:

  • Network congestion: When the number of data packets in the network exceeds the network's capacity, network congestion occurs, causing problems such as packet queuing, delay, and loss.
  • Buffer overflow: When the buffer space of the sender or receiver is insufficient to store data packets, buffer overflow occurs, leading to packet discarding.
  • Packet size too large: When the size of the data packet exceeds the Maximum Transmission Unit (MTU) of the network, the problem of packet size too large occurs, resulting in packet fragmentation or discarding.
  • Excessive sending rate: When the sending rate of the sender exceeds the processing speed of the receiver or the transmission speed of the network, the problem of excessive sending rate occurs, leading to packet accumulation or loss.

5 Common Solutions to UDP Packet Losses:

  • Adding retransmission mechanism: Adding retransmission mechanism at the sender and receiver, when the receiver detects packet loss, it can request the sender to retransmit the lost packets.
  • Adjusting the sending rate: Reduce the possibility of network congestion by adjusting the sending rate. Rate control algorithms can be used to dynamically adjust the sending rate.
  • Using reliable UDP protocol: Some UDP protocol implementations are reliable, and they provide confirmation and retransmission mechanisms similar to TCP. Using reliable UDP protocol can reduce the possibility of packet loss.
  • Optimizing network devices: Optimizing network devices can improve their processing capacity and throughput, thereby reducing the possibility of packet loss. In addition, ensuring the normal operation of network devices is also very important.
  • Using QoS (Quality of Service) technology: QoS technology can ensure the priority and transmission quality of data packets, thereby reducing the possibility of packet loss. In networks that support QoS, different priority queues can be set according to the requirements of the application.

The best transport to solve UDP packet loss - Raysync

These are some commonly used methods to solve UDP packet loss, but they each have their own advantages, disadvantages, and applicable scenarios. There is no universal method. So, is there a solution that can simultaneously solve multiple causes and impacts of UDP packet loss and provide a one-stop transmission solution?

Raysync is a transfer solution based on self-developed Raysync protocol, which can achieve high-speed, secure, and stable transmission services based on the UDP protocol. The advantages of Raysync are as follows:

  •  High-speed transfer: Raysync can use the intelligent acceleration technology of the Raysync protocol to break through the limitation of network bandwidth and improve the transmission speed, achieving transmission efficiency hundreds of times higher than FTP.

  • Security and stability: Raysync can use the reliable transmission technology of the Raysync protocol to effectively solve the problem of UDP packet loss, ensure data integrity and order, and supports functions such as breakpoint resumption, encrypted transmission, and verification transmission, ensuring data security and stability.

  • Multi-mode transmission: Raysync supports multiple transmission modes, including peer-to-peer transfer, point-to-multipoint transfer, and multipoint-to-multipoint transfer, to meet different transmission needs and scenarios.

  • Multi-terminal coverage: Raysync supports a variety of terminal devices, including PCs, mobile phones, tablets, servers, etc., to achieve cross-platform transmission services.

  • Easy integration: Raysync can provide multiple integration methods, including SDK, API, command line, etc., to facilitate users to quickly integrate Raysync's transmission services.


In conclusion, UDP packet loss is a common problem and a problem worth studying. The causes and impacts of UDP packet loss are diverse, and the solutions to UDP packet loss also have their own characteristics. When choosing a method to solve UDP packet loss, it is necessary to weigh the advantages and disadvantages of various methods according to their own transmission scenarios and needs and find the most suitable method. Of course, if a company wants a one-stop transfer solution, then Raysync is a good choice. It can provide high-speed, secure, and stable transmission services for companies, making transmission smoother and more efficient.


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