Among the problems affecting the current version of TCP are the slow recovery upon coarse timeout expiration on long, fat pipes, and the reaction to random segment losses. Both problems are known to reduce the throughput of a connection. This paper proposes and evaluates the merits of a class of TCP modifications obtained through a source-based estimate of the available bandwidth by measuring the rate of received ACKs. The estimated bandwidth is used to set the slow start threshold and the congestion window after a timeout or 3 duplicate ACKs. The goal is to allow sources to recover quickly after sporadic losses over high bandwidth-delay links.
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