Eg sending rate alens 70 60 50 40 30 20 10 10 15 20 25

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Unformatted text preview: 476 What can we do about it? •  Two types of losses: conges)on and corrup)on •  One op)on: mask corrup)on losses from TCP –  Retransmissions at the link layer –  E.g. Snoop TCP: intercept duplicate acknowledgments, retransmit locally, filter them from the sender •  Another op)on: –  Tell the sender about the cause for the drop –  Requires modifica)on to the TCP endpoints Conges)on Avoidance •  TCP creates conges)on to then back off –  Queues at bolleneck link are omen full: increased delay –  Sawtooth palern: jiler •  Alterna)ve strategy –  Predict when conges)on is about to happen –  Reduce rate early •  Two approaches –  Host centric: TCP Vegas –  Router- centric: RED, DECBit TCP Vegas TCP Vegas KB Idea: source watches for somessigntthat router’s queue is building up •  Idea: source watches for ign hat...
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This note was uploaded on 01/27/2014 for the course COSC 4377 taught by Professor Staff during the Spring '08 term at University of Houston.

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