Nprobe: Network protocol analysis
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Non-Intrusive Estimation of Web Server Delays
James Hall, Ian Pratt and Ian Leslie
IEEE LCN2001, November 2001
We introduce a novel passive network monitoring architecture which
enables us to capture and integrate data from different levels of the
protocol stack using a probe which can be placed at any arbitrary
point in the network. We subject the data gathered to off-line
analysis and show how, by modelling the dynamics of the protocols
observed, we are able to extract information which would not be
available using existing means. In this paper, we show how the
technique can be used to passively measure Web Server response
latency. Experiments are described which use artificially generated
loads to validate the techniques used, and results obtained from the
observation of real traffic are presented.
[gzipped postscript 99.62 KB]
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