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TCP retransmission rate calculation method and method for improving TCP KPI calculation accuracy

A calculation method and retransmission rate technology, applied in the field of network communication, can solve problems such as TCP retransmission rate distortion, loss of packet capture module, large error in TCP download rate, etc., and achieve the effect of improving performance, efficiency and accuracy

Inactive Publication Date: 2019-11-01
DEKSCOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0013]The defect of this algorithm is: in the case of severe packet loss in the network port packet capture module, it is impossible to accurately count the total number of bytes of the downlink data packet. As a result, a large error occurs in the calculation of the TCP download rate (the error rate is basically proportional to the severity of the packet loss rate)
[0014]2. TCP delay
[0017] The defect of this algorithm is: in the case of high network traffic, the TCP handshake packet SYN and the TCP handshake response packet SYN, ACK are likely to be lost by the packet capture module , resulting in the inability to calculate the TCP delay index
[0021]The defect of this algorithm is: in the case of high network traffic, because the packet capture module seriously loses packets to the downlink TCP packets, the number of repeated packets and Normally sent downlink packets may not be captured, resulting in severe distortion of the calculated TCP retransmission rate

Method used

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  • TCP retransmission rate calculation method and method for improving TCP KPI calculation accuracy
  • TCP retransmission rate calculation method and method for improving TCP KPI calculation accuracy
  • TCP retransmission rate calculation method and method for improving TCP KPI calculation accuracy

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Embodiment 1

[0070] see figure 1 , the present invention discloses a TCP retransmission rate calculation method, through the ACK field of the upstream TCP ACK response packet header, the total number of downlink TCP packets and the number of TCP retransmission packets are compared, so as to improve the TCP retransmission rate index Calculation accuracy.

[0071] Described method specifically comprises the steps:

[0072] Step C1, initialize the number of TCP retransmission packets R=0, the average TCP downlink packet length B=0, and initial ACK 0 ;

[0073] Step C2, when a new downlink TCP message is captured, analyze the packet header information of the message, and obtain its packet length B n and package sequence number SEQ n， And accumulate the total number of downlink packets n; and calculate the downlink TCP average packet length B=∑(B 0 ,B 1 ..B n ) / n;

[0074] Step C3, comparing the sequence number SEQ of the current downlink TCP packet n Same as the packet sequence number...

Embodiment 2

[0088] A method for improving the accuracy of TCPKPI calculation, said method comprising: a TCP retransmission rate calculation step, through the ACK field of the uplink TCP ACK response packet header, the downlink TCP total packet number and the TCP retransmission packet number are compared, In order to improve the calculation accuracy of the TCP retransmission rate index. Specifically include the following steps:

[0089] Step C1, initialize the number of TCP retransmission packets R=0, the average TCP downlink packet length B=0, and initial ACK 0 ;

[0090] Step C2, when a new downlink TCP message is captured, analyze the packet header information of the message, and obtain its packet length B n and package sequence number SEQ n， And accumulate the total number of downlink packets n; and calculate the downlink TCP average packet length B=∑(B 0 ,B 1 ..B n ) / n;

[0091] Step C3, comparing the sequence number SEQ of the current downlink TCP packet n Same as the packet ...

Embodiment 3

[0101] The present invention discloses a method for improving the calculation accuracy of TCPKPI, the method comprising:

[0102] [Step A] TCP download rate calculation optimization step, according to the TCP header information, AcknowledgmentNumber indicates the confirmation of the data flow sequence number of the received downstream packet, the size of the ACK value = the size of the last ACK value + the size of the received downstream packet , according to this feature, according to the ACK difference of the upstream packet, the actual number of TCP download bytes is deduced to calculate the TCP download rate. see Figure 4 , Step A specifically includes:

[0103]Step A1, analyze the protocol of the captured TCP data flow, track and analyze the TCP uplink ACK message, especially analyze the Acknowledgment Number field value of the acknowledgment sign wherein, the Acknowledgment Number field value of the acknowledgment sign acknowledgment number is referred to as the ACK va...

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Abstract

The invention discloses a TCP retransmission rate calculation method and a method for improving TCPKPI calculation accuracy, which are used for correcting the downlink TCP total packet number and theTCP retransmission packet number through an ACK field of an uplink TCP ACK response packet header so as to improve the calculation accuracy of a TCP retransmission rate index. According to the TCP retransmission rate calculation method provided by the invention, the TCP retransmission rate calculation accuracy under the condition that network packet capture is damaged can be improved, and the TCPflow monitoring performance and efficiency of network DPI equipment are improved. Moreover, the method for improving the TCP KPI calculation accuracy provided by the invention can improve the TCP downloading rate, TCP time delay and TCP retransmission rate index calculation accuracy, and improve the TCP flow monitoring performance and efficiency of the network DPI equipment.

Description

technical field [0001] The invention belongs to the technical field of network communication and relates to a method for monitoring TCP flow performance, in particular to a method for calculating a TCP retransmission rate; meanwhile, the invention also relates to a method for improving the calculation accuracy of TCP KPI. Background technique [0002] In recent years, with the rapid development of the Internet, the demand for monitoring the service quality of IP networks and various upper-layer applications (such as Web access, e-commerce, video, games, instant messaging, etc.) is also increasing. At present, the industry generally deploys passive monitoring probe devices at various key network node locations (including the backbone layer, aggregation layer, access layer, and user side) of the IP network to monitor the service quality of IP network traffic and various upper-layer applications. . [0003] Due to the rapid growth of IP network traffic, 10G, 40G and even 100G ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/26
CPCH04L43/028H04L43/08
Inventor 翁昌清刘东杨文昊吴雪波
Owner DEKSCOM TECH
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