Analyzing BitTorrent Traf?c Across Large Network

The use of peer-to-peer (P2P) applications is growing dramatically, particularly for BitTorrent system. In order to gain insights into BitTorrent systems and the network traffic load they place on ISPs, we have undertaken an measurement study. Our experimental evaluation is ISP oriented instead of peer oriented, which enables us to study the global characteristics of BitTorrent system. We have developed a dedicated BitTorrent sniffer platform to collected extensive packet across a large ISP network. The measurement results bring important insights into BitTorrent systems. Specifically,our results show that 1) BitTorrent flashcrowd appears around midnight due to the BitTorrent users habits of behavior; 2) workload generated by BitTorrent extention - DHT is much more than it generated by calssic BitTorrent; 3) overhead rather than data transfer is the dominant component of the totle BitTorrent traffic due to DHT; 4) Zipf and pareto are the suitable model to characterize the distribution of visits to both trackers and BitTorrent Websites.Insights obtained in this study will be valuable for the management and development of future P2P file transform systems.