CMU INI 14740 - liang2005 (25 pages)

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liang2005



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liang2005

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Pages:
25
School:
Carnegie Mellon University
Course:
Ini 14740 - Fundamentals of Telecommunications Networks

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The KaZaA Overlay A Measurement Study Jian Liang Rakesh Kumar Keith W Ross Department of Computer and Department of Electrical and Department of Computer and Information Science Computer Engineering Information Science Polytechnic University Polytechnic University Polytechnic University Brooklyn NY USA 11201 Brooklyn NY USA 11201 Brooklyn NY USA 11201 Email jliang cis poly edu Email rkumar04 utopia poly edu Email ross poly edu September 15 2004 Abstract Both in terms of number of participating users and in traffic volume KaZaA is one of the most important applications in the Internet today Nevertheless because KaZaA is proprietary and uses encryption little is understood about KaZaA s overlay structure and dynamics its messaging protocol and its index management We have built two measurement apparatus the KaZaA Sniffing Platform and the KaZaA Probing Tool to unravel many of the mysteries behind KaZaA We deploy the apparatus to study KaZaA s overlay structure and dynamics its neighbor selection its use of dynamic port numbers to circumvent firewalls and its index management Although this study does not fully solve the KaZaA puzzle it nevertheless leads to a coherent description of KaZaA and its overlay Furthermore we leverage the measurement results to set forth a number of key principles for the design of a successful unstructured P2P overlay The measurement results and resulting design principles in this paper should be useful for future architects of P2P overlay networks as well as for engineers managing ISPs 1 1 Introduction On a typical day KaZaA has more than 3 million active users sharing over 5 000 terabytes of content On the University of Washington campus network in June 2002 KaZaA consumed approximately 37 of all TCP traffic which was more than twice the Web traffic on the same campus at the same time 8 With over 3 million satisfied users KaZaA is significantly more popular than Napster or Gnutella ever was Sandvine estimates that in the US 76 of P2P file



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