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EVALUATION OF PROACTIVE CONGESTION CONTROL ON RED GATEWAY



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Evaluation of Proactive Congestion Control on RED Gateway Kuoling Fang Alcatel USA Inc Plano TX klfang hotmail com Hee Yong Youn and Hyunseung Choo School of Electrical and Computer Engineering Sungkyunkwan Univ Suwon Korea youn choo ece skku ac kr Chansu Yu School of Engineering Info Comm Univ Taejon Korea cyu icu ac kr Abstract In this paper we investigate the network performance of TCP hosts and gateways employing New Reno TCP using a parallel simulator The gateway adopts the random early detection RED scheme and proactive congestion control mechanism to enforce fair sharing among competing TCP connections The test network is modeled using PARSEC The simulation reveals that the RED gateway drops only a small number of packets and utilization of the bottleneck link on the RED gateway is less than 75 The number of retransmission timeouts recorded at the TCP senders is also small Moreover increasing the bandwidth of the gateway input links does not substantially improve the network performance while increasing the number of input links is very effective Key words congestion control New Reno TCP parallel simulation PARSEC random early detection 1 Introduction The Internet has experienced explosive growth in the past few years In the presence of more hosts and users with fast link connections the traffic load has shown dramatic increase Therefore Internet users often encounter some congestion The need for Internet congestion control became apparent during mid 80 s and network collapse due to congestion had already been predicted 1 The random early detection RED scheme 2 3 was introduced as a measure of proactive congestion control for achieving low delay and high throughput Study on the network performance of the TCP hosts and gateways employing the RED approach shortly RED gateways using a parallel simulator is the main objective of this paper A significant amount of today s Internet traffic including WWW HTTP file transfer email and remote access are carried by the



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