Research On Bandwidth Measurement And Flow Sampling Of IPv6-based Next Generation Internet

Recently, with the gradual spread of IPv6, the network measurement, which is the basic means to guarantee high performance, high dependability and high usability of network, gains more and more people's concern.This paper is supported by Natural Science Foundation of China (NSFC, No. 60572147) titled with"The research of key technologies of Next Genaration Internet measurement, based on IPv6". Firstly, the foundational concepts, classifications of methodology and the present-day research of network bandwidth measurement are introduced. The foundational concepts and the shortages of three existent methods of network bandwidth measurement are pointed out. Secondly, on the basis of characteristics of IPv6 packet format, an end-to-end measurement method, called IPv6-pckt-pr, is proposed to estimate the bottleneck bandwidth in the next generation Internet. This method gives same Flow Labels to the probing packet pairs, sets the Traffic Class of the probing packets to the highest level, estimates the end-to-end bottleneck bandwidth by sending packet pairs of different size. The explicitly generated self-similarity cross traffic in OPNET simulation allows the research to be more efficient. Theoretical analysis and simulations show this method is accurate, with less probing time and low bandwidth expense. Thirdly, the network flow sampling technology is discussed. The principles of packets sampling are introduced. What's more, the principle and implementation of Poisson sampling is put forward, by C code. Finally, some ideas and suggestions are brought forward for the further work to overcome the limitation of existing method.