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The Internet active bandwidth measurement technology research

Author: JiaShengWen
Tutor: GaoZhongHe
School: Qufu Normal University
Course: Applied Computer Technology
Keywords: Bandwidth measurement Four-tuple Bi-directional bandwidth Probe packets column Bottleneck bandwidth
CLC: TP393.06
Type: Master's thesis
Year: 2011
Downloads: 40
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Abstract


The 21st century is the information age as the core of a network, with the increasing of network applications, it is in the full enjoyment of network technology brings fast and convenient at the same time, the network performance is also put forward higher requirements. Extraction and analysis of performance indicators in order to improve and enhance the performance of the network, network performance measurement have come into being. Network performance is representative of the quality of service provided by the network infrastructure to the upper application, it is composed by a number of parameters for operators meaningful and can be used for system design, configuration, operation and maintenance, in which many parameters bandwidth is one of the most important , dynamic, fast, and accurate measurement of bandwidth to improve network performance and utilization of the network itself, has a very important significance. The bandwidth measurement theory, methods and their works, many testing tools have been developed and applied to the actual. However, due to the limitations of the measuring method simplified modeling or measurement method of one-sided and measurement hardware facilities, these measurement instruments exist in the actual measurement test accuracy is not enough, the complexity of the testing process, and a small range of applications and other shortcomings. Thesis for computer network bandwidth measurement analysis, explained with reference to a number of domestic and foreign literature based on the basic concept of bandwidth measurement, measurement methods and model, which focuses on analysis of VPS models and PGM model; summarizes bandwidth measurement areas of some of the problems to be solved; difficult deployment problems and proposed solutions for the problem of asymmetric link and measurement facilities, and theoretical analysis and NS2 simulation experiment and try to verify the feasibility of the program. The innovative work of this article is as follows: First, for the problem of asymmetric link, the paper proposes a method of bi-directional bandwidth measurement a four tuple-based link. This method is derived from the VPS the model, is a single-ended measurements. It requires that the source end of the measurement path to send a four-tuple probe packets, TCP and ICMP packets, probe packets at the destination end, produce a corresponding response message, the source receives the response packet statistics probe packets RTT delay. Then analyze each RTT delay, and the use of a linear relationship between the difference between the packet size and the round-trip delay difference to the uplink and downlink bandwidth calculated link. The theoretical analysis and NS2 experimental simulation results show that this method can reduce the detection injected to the network traffic and speed measurements to improve the measurement accuracy to solve the actual network link asymmetry. Second, the problem of measurement facilities in the actual network applications difficult to deploy, the paper designs a measurement based on the PGM model the sub-path bottleneck bandwidth and link positioning method. The method can be contained in an ultra-path of this sub-path ends of the measured bottleneck bandwidth of the sub-path, and locate the bottleneck link is a double-ended measurement method. It uses load is limited by the probe packets and TTL packets consisting of probe packets string or package column, probe packets at both ends of the load packets designed probes sent one end of the path string in the message transfer process, the load packets discarded subpath TTL limited, so that you can make the time interval between the two probe packets remain to destination. Statistical each of the probe packets between the time interval, then the destination end corresponding to the maximum interval is the bottleneck link at time intervals in the sub-path. Calculated by the time interval and packet size this bottleneck bandwidth, and locate the bottleneck link. Different background traffic using the NS2 simulation tools, this method was validated simulation results show that this method is accurate and feasible.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Computer network > General issues > Computer networks, test , run
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