基于NS2的TCP性能仿真研究

Simulation of TCP performance based on NS2

探讨了网络仿真软件NS2的结构、功能、仿真原理及仿真方法以及TCP协议的特点,对影响TCP性能的三个因素Round-TripTimes(RTT)、Timer Granularity和Slow-start Threshold(Ssthresh)进行分析并分别做仿真实验,通过对吞吐量、带宽的比较,得出较短的RTT总是有较好的执行效果;Timer Granularity与Slow-start Threshold的取值需要视具体情况而定。

The paper discussed the structure,function,principle and method of NS2 and the characteristic of the TCP protocol.On anglicizing the three factors Round-Trip Times（RTT）、Timer Granularity and Slow-start Threshold（Ssthresh）are affecting TCP performance,and tested using Network Simulator 2 （NS2） on throughput,bandwidth,then know that a shorter RTT is always better implementation of the results;but Timer Granularity and Slow-start Threshold values need to depending on the specific circumstances.