A determination method of the initiation relationship within TCP messages based on TCP timestamp options

Abstract

A method deciding the indexical relations among TCP messages based on TCP timestamp option belongs to TCP performance analyzing field of transmission protocol; the invention is characterized in that the method comprise the following steps: capturing message on random part of the connecting paths of TCP; changing the original timestamp value on each TCP timestamp option of the message into a new timestamp value which strictly and progressively increases along the connecting direction; recording the original timestamp value of the message and the new timestamp value on a timestamp value reflecting table on the connecting direction; finding the timestamp value reflecting table corresponding to the message in the timestamp value reflecting table which is in a opposite direction with the message, and revising the showing and answering field on the timestamp of the message according to the content of list item; further deciding the indexical relations among messages according to the corresponding list item which is found out in the last step; adding a timestamp option for a SYN message without a timestamp option. The users and network engineering personnel can use the method to diagnose the limiting factors of TCP connecting and transmitting speed.

Description

technical field [0001] The invention relates to the performance analysis and diagnosis of the TCP transmission protocol in the Internet. Background technique [0002] TCP is the most widely used transport layer protocol in the Internet. Many important Internet applications such as HTTP, FTP, BitTorrent, NFS, etc. use it to transmit data. The higher the TCP transfer rate, the faster the file will download. The TCP transfer rate largely determines the performance of these applications. The transmission rate of an actual TCP connection may be limited by the following factors: 1) limitations of the application, such as the application itself only intermittently generates a small amount of data, 2) limitations of the host configuration, such as too small a sending or receiving end Cache, 3) Network limitations, such as network packet loss or bottleneck bandwidth limitations on the path. [0003] Researchers at the Pittsburgh Supercomputing Center (PSC) developed a system calle...

AI Technical Summary

Problems solved by technology

However, in the current implementation of the operating system, the TSval of the message sent by host B is not strictly monotonically rising, for example, it may send one or more messages with TSval of 100

At this time, for a packet with a TSecr of 100 sent by host A, we cannot determine which packet with a TSval of 100 sent by host B caused the packet

Images