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The characteristics of satellite channels (notably the large round trip delay) heavily influence the TCP flow control, which is essentially based on acknowledgements. The effect is a delay in the acknowledgement reception and, consequently, in the delivery of messages, with respect to cabled networks. The drawbacks of using TCP in a satellite environment may be mitigated by a proper tuning of some TCP parameters. The behaviour of the protocol, as a consequence of variations in the buffer length of both transmitter and receiver and in the initial congestion window, is investigated in the paper and a proper configuration that drastically improves performance (measured by the throughput in bytes\/s and by the overall transmission time) is proposed. Two test environments have been used to evaluate the proposed modifications: a real testbed, composed of two remote hosts connected through a satellite channel, and a satellite network emulator, composed of three PCs (two of them representing two hosts, the third one reproducing the behaviour of the satellite link). In both environments, a ftp\u2010like application designed for the aim has represented the reference application; three different file sizes have been used and the different effect of the tuning, depending on the transfer length, has been evidenced; the analysis includes both the single application case and the multiple application case, where several connections a time share the satellite link. Copyright \u00a9 2001 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/sat.682","type":"journal-article","created":{"date-parts":[[2002,8,25]],"date-time":"2002-08-25T20:41:50Z","timestamp":1030308110000},"page":"93-110","source":"Crossref","is-referenced-by-count":19,"title":["TCP modifications over satellite channels: study and performance evaluation"],"prefix":"10.1002","volume":"19","author":[{"given":"Mario","family":"Marchese","sequence":"first","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2001,2,14]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1109\/MCOM.1999.774886"},{"key":"e_1_2_1_3_2","unstructured":"AdamiD BozzardiA DardariD MarcheseM RongaLS.Integration of multimedia services on satellite heterogeneous networks. CNIT Internal Report (in Italian)."},{"key":"e_1_2_1_4_2","unstructured":"The DICE\/CODE Project Page. 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