| Summary: | Rapid growth of Internet traffic and the increase of new
user applications authorize the development of new internet
infrastructure. Congestion remains the major problem that
affects the Internet service quality. Avoiding packet drops
keeps network bandwidth and permits congestion signals to
be propagated faster. Sending congestion information is
essential to the network performance. Using Explicit Congestion Notification (ECN) to notify the source about the
network congestion can result in sending congestion signal
faster so that the sender can reduce its congestion window
sooner which leads to better network utilization. When ECN is enabled on routers, they mark packets instead of dropping
them. ECN mechanism does not require creation ofadditional
transfer at the router and can be applied in the data path of routers.In this article, we study the behavior of ECN capable TCP and examine the effect of ECN on long-lived
TCP connections using Random Early Detection (RED) and
Drop tail gateway mechanisms. We estimate the gain
introduced by ECN, in terms of throughput, with different sets of number of TCP users and a point of congestion. Our
analysis and simulations results show that the use of ECN
over long-lived TCP connections sharing a bottleneck can
improve the overall throughput, having less loss, less delay
time, and better network utilization
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