Research On Topology Visualization And Delay Measurement In Internet And Their Implement In DNMAI

As the applications of Internet become more and more widely, the research on measurement of network performance has been more and more important. This paper designed and implemented the Distributed Network Measurement and Analysis Infrastructure, DNMAI, an infrastructure with good extensibility. DNMAI can measure and analyze network performance preferably. This paper introduced detailedly the infrastructure of DNMAI, implement of DNMAI and advantage of DNMAI.This paper implemented end to end delay measurement in DNMAI. In the delay measurement, the packet size and the packet type have changed, the packet can be sent from sender and receiver simultaneously.This paper gives a network topology visualization algorithm based on A* algorithm. Through the topology visualization program has been tested in operational networks, it is reality that this algorithm can meet the real-time requirement of network topology visualization, and solve the problem of loop caused by single topology visualization algorithm, therefore, it's preferably suitable for the research on complicated network topology.