Transport Layer - Freie Universität Berlin
Transport Layer - Freie Universität Berlin
Transport Layer - Freie Universität Berlin
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Fast Retransmit and Fast Recovery<br />
● Slow Start is not well suited when only a single packet is lost…<br />
● Time-out period often relatively long � Long delay before resending lost packet<br />
● E.g. short interference on a wireless link<br />
● Fast Retransmit<br />
● The receiver sends a duplicate ACK immediately when an out-of-order segment<br />
arrives<br />
● When the sender has received 3 duplicate ACKs, it retransmits the missing<br />
segment.<br />
● Hopefully, the acknowledgement for the repeated segment arrives before a timeout<br />
Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 8: <strong>Transport</strong> <strong>Layer</strong><br />
8.102
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