Centrum voor Wiskunde en Informatica PNA Probability, Networks and Algorithms Probability, Networks and Algorithms Load characterization and anomaly detection for voice over IP traffic M.R.H. Mandjes, I. Saniee, A.L. Stolyar REPORT PNA-E0512 OCTOBER 2005
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Load chracterization and anomaly detection for voice over IP traffic
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C e n t r u m v o o r W i s k u n d e e n I n f o r m a t i c a
PNAProbability, Networks and Algorithms
Probability, Networks and Algorithms
Load characterization and anomaly detection for voice over IP traffic
M.R.H. Mandjes, I. Saniee, A.L. Stolyar
REPORT PNA-E0512 OCTOBER 2005
CWI is the National Research Institute for Mathematics and Computer Science. It is sponsored by the Netherlands Organization for Scientific Research (NWO).CWI is a founding member of ERCIM, the European Research Consortium for Informatics and Mathematics.
CWI's research has a theme-oriented structure and is grouped into four clusters. Listed below are the names of the clusters and in parentheses their acronyms.
Load characterization and anomaly detection forvoice over IP traffic
ABSTRACTWe consider the problem of traffic anomaly detection in IP networks. Traffic anomalies typicallyarise when there is focused overload or when a network element fails and it is desired to inferthese purely from the measured traffic. We derive new general formulae for the variance of thecumulative traffic over a fixed time interval and show how the derived analytical expressionsimplifies for the case of voice over IP traffic, the focus of this paper. To detect load anomalies,we show it is sufficient to consider cumulative traffic over relatively long intervals such as 5minutes. We also propose simple anomaly detection tests including detection of over/underload.This approach substantially extends the current practice in IP network management where onlythe first order statistics and fixed thresholds are used to identify abnormal behavior. Weconclude with the application of the scheme to field data from an operational network.
2000 Mathematics Subject Classification: 60K25Keywords and Phrases: traffic measurements, anomalies, Voice over IPNote: This paper was published in IEEE Transactions on Neural Networks, 2005
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