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Optimization of TCP/IP Traffic Across Shared ADSL (2005)
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BibTeX
@MISC{Brouer05optimizationof,
author = {Jesper Dangaard Brouer},
title = {Optimization of TCP/IP Traffic Across Shared ADSL},
year = {2005}
}
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Abstract
This thesis presents practical studies of the TCP performance problems caused by the asymmetric nature of ADSL connections. Previously, it has been shown on other types of asymmetric links that TCP throughput may be reduced due to a variable and imperfect ACK feedback. The upstream capacity of ADSL products in general does not disturb the ACK feedback mechanism, but we analyze and document that TCP traffic across ADSL in fact is affected by the asymmetric nature of ADSL, when utilizing the upstream capacity. For a single user ADSL installation it is manageable to avoid upstream congestion, but for larger networks, connected to the Internet by ADSL, the rise of peer-to-peer file sharing applications may result in a permanently congested upstream link. The thesis provides evidence that the achievable downstream throughput is reduced significantly in case of a saturated upstream link. Saturation of the upstream link introduces a high queueing delay that effectively renders the connection useless for interactive and other delay-sensitive applications (like VoIP).
Keyphrases
upstream capacity upstream link asymmetric nature practical study delay-sensitive application tcp performance problem asymmetric link connection useless ack feedback mechanism tcp throughput adsl connection single user adsl installation upstream congestion tcp traffic achievable downstream throughput saturated upstream link imperfect ack feedback peer-to-peer file adsl product high queueing delay
