On making TCP robust against spurious retransmissions

Authors:
Ying Jie Zhu;Lillykutty Jacob
Affiliations:
Department of Computer Science, School of Computing, National University of Singapore, 3 Science Drive 2, Singapore 117543;Department of Computer Science, School of Computing, National University of Singapore, 3 Science Drive 2, Singapore 117543
Venue:
Computer Communications
Year:
2005

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Abstract

Despite the fact that Transmission Control Protocol (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 today's Internet, the network environment is more complex than ever. TCP'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 this article, 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, we also provide some results of our comparative performance study of these detection and mitigation techniques.