Automated detection of changes in computer network measurements using wavelets

Monitoring and measuring various metrics of high speed and high capacity networks produces a vast amount of information over a long period of time. For the collected monitoring data to be useful to administrators, these measurements need to be analyzed and processed in order to detect interesting characteristics such as sudden changes. In this paper wavelet analysis is used along with the universal threshold proposed by Donoho - Johnstone in order to detect abrupt changes in computer network measurements. Experimental results are obtained to compare the behaviour of the algorithm on delay and data rate signals. Both type of signals are measurements from real networks and not produced from a simulation tool. Results show that detection of anomalies is achievable in a variety of signals.