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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Performance evaluation of BitTorrent-like peer-to-peer systems in the presence of network address translation devices

Liu, Yangyang 15 February 2010 (has links)
There is no doubt that BitTorrent nowadays is one of the most popular peer-to-peer (P2P) applications on the Internet, contributing to a significant portion of the total Internet traffic and being a basis for many other emerging services such as P2P Internet Protocol Television and Video on Demand. On the other hand, Network Address Translation (NAT) devices have become pervasive in almost all networking scenarios. Despite of the effort of NAT traversal, it is still very likely that applications, especially P2P ones, cannot receive incoming connection requests properly if they are behind NAT. Although this phenomenon has been widely observed in measurement work, so far there is no quantitative study in the literature examining the impact of NAT on P2P applications. In this work, we build analytical models to capture the performance of BitTorrent-like P2P systems in a steady state, in the presence of homogeneous and heterogeneous NAT peers. We also propose biased optimistic unchoke strategies, in order to improve the overall system performance and fairness metrics considerably. The analytical models have been validated by simulation results, which also reveal some interesting facts about the coexistence of NAT and public peers in P2P systems.

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