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Title: Investigations on making TCP robust against spurious retransmissions
Keywords: network protocol, network performance
Issue Date: 16-Feb-2004
Source: ZHU YING JIE (2004-02-16). Investigations on making TCP robust against spurious retransmissions. ScholarBank@NUS Repository.
Abstract: Transmission Control Protocol (TCP) is the dominant transport protocol in the Internet. Despite the fact that TCP is a stable and mature protocol, and has been well tuned over years, changes in its congestion control are still in progress without altering the fundamental underlying dynamics of TCP congestion control. In todaya??s Internet, the network environment is more complex than ever. TCPa??s loss detection methods may falsely invoke retransmission even when the original packet is actually not lost. Such behavior is called Spurious Retransmission, which damages the TCP throughput greatly. In the recent years, several techniques have been proposed to detect spurious retransmissions and to mitigate their impacts on TCP performance. The basic ideas of these mitigation techniques are to a??undoa?? unnecessary congestion control responses by restoring the congestion window (cwnd) and slow start threshold (ssthresh), and to avoid making the same mistake in the future by tuning the duplicate acknowledgement threshold (to prevent spurious fast retransmits) and the RTO timer (to prevent spurious timeouts) to appropriate values. In the thesis, we describe Spurious Timeout and Spurious Fast Retransmit, the causes for their occurrences, and the impacts that they have on TCP performance. Then we discuss the various detection and mitigation techniques available to make TCP robust to these spurious retransmissions. Using simulations on NS2 and experiments on real protocol implementations and network test bed, we do extensive comparative performance study of these detection and mitigation techniques.
Appears in Collections:Master's Theses (Open)

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