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Title: Performance and security issues of TCP bulk data transfer in a last mile wireless scenario - investigations and solutions
Keywords: TCP, Wireless, Security, Fairness, Performance, Congestion Control
Issue Date: 28-Jan-2004
Citation: VENKATESH SIDDENALLI OBANAIK (2004-01-28). Performance and security issues of TCP bulk data transfer in a last mile wireless scenario - investigations and solutions. ScholarBank@NUS Repository.
Abstract: TCP was designed nearly three decades ago with some inherent assumptions. Over the years many fixes and solutions have been proposed to make TCP cope with changing network conditions. This research work investigates some of the proposed solutions, studies their applicability and/or limitations in the last mile wireless scenario and proposes novel solutions. Two specific issues are addressed in this thesis:(a) The effect of algorithms that improve the fairness of TCP congestion avoidance on slow links and long thin networks, (b) The combined issue of performance and security in a wired-cum-wireless scenario.The first part of the thesis demonstrates that fairness algorithms have a detrimental effect on connections traversing slow links and long thin networks. Simulations and test-bed experiments substantiate this claim. Some solutions are suggested to overcome the performance degradation.The second part of the thesis explores the limitations of existing solutions for improving TCP performance in hybrid wired-wireless networks. The thesis proposes an integrated solution for IP security and TCP performance in hybrid wired-wireless networks, traditionally dealt with in a mutually exclusive manner. The novel scheme called the SPEP (Secure Performance Enhancing Proxy) ensures end-to-end security, enhances TCP performance, and offers multifarious benefits over the existing schemes. The SPEP scheme was implemented in FreeBSD 4.5 and performance tests were conducted in a controlled test-bed setup. The results show remarkable improvement in TCP performance in a "last mile wireless" scenario.
Appears in Collections:Master's Theses (Open)

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