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#REDIRECT [[TCP congestion control#Fast retransmit]] |
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'''Fast Retransmit''' is an enhancement to [[Transmission Control Protocol| TCP]] which reduces the time a sender waits before retransmitting a lost [[Protocol data unit| segment]]. |
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A TCP sender uses timer to recognize lost segments. If an acknowledgement is not received for a particular segment within a specified time (a function of the estimated [[Round-trip delay time]]), the sender will assume the segment was lost in the [[Computer network| network]], and will retransmit the segment. |
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The fast retransmit enhancement works as follows: if a TCP sender receives three duplicate acknowledgements with the same acknowledge number (that is, a total of four acknowledgements with the same acknowledgement number), the sender can be reasonably confident that the segment with the next higher sequence number was dropped, and will not arrive out of order. The sender will then retransmit the packet that was presumed dropped before waiting for its timeout. |
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== External links == |
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*{{cite IETF |
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| title = TCP Congestion Control |
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| rfc = 2581 |
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| sectionname = Fast Retransmit/Fast Recovery |
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| section = 3.2 |
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| author = Mark Allman, Vern Paxson, W. Richard Stevens |
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| year = 1999 |
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| month = April |
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| publisher = [[Internet Engineering Task Force|IETF]] |
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| accessdate = 2010-05-01 |
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}} |
}} |
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* [http://www.tcpipguide.com/free/t_TCPCongestionHandlingandCongestionAvoidanceAlgorit-3.htm TCP Congestion Handling and Congestion Avoidance Algorithms] — The TCP/IP Guide |
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[[Category: |
[[Category:Transmission Control Protocol]] |
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Latest revision as of 18:16, 10 June 2017
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