Research On IP Internet Network Performance Base On Network Simulation 2

With the development and popularization of Internet, the scale of IP network grow fast and it becomes more and more complexity. A more efficient method to study network and a new way to improve and optimize IP network's performance for people's growing needed become a great challenge to researchers. Network simulation technique is the key method to measure and understand network. NS-2 is one of the most popular softwares which can be used in network simulation for its powerful function and friendly develop environment.This paper introduced the structure and principle of NS2,as well as the performance study on IP network.Through carefully analyze, we designed the IP network performance and protocols research experiment project with simulation model based on NS2.Base on two experiment, we study and analyze different kinds of topologic structures and protocols'impact on IP network . This paper designed four experiment projects for each of topologic structures, the performance parameter and simulation result are got and we make some conclusion for the performance impact of different topologic structures.The experiment result prove that the IP network will got different network performance whith different different kinds of topologic structures.We should choose a appropriate topologic structure when we project a new IP network.We also designed network transmission experiment based on TCP protocol and UDP protocol and analyze the effect on IP network performance depend on the 2 difference protocol. As global sync phenomenon may occur during TCP transmission and this phenomenon will cause network congestion to bring bad influence for network performance. This paper also designed project to observe global sync phenomenon, and analyze the factor which cause this phenomenon and its impact to network's performance.The experiment result prove that two protocols had different characters.UDP protocol has higher efficiency and TCP protocol is more credible.But if there are more than one TCP transfers on one link,the IP network performance will be debased.