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MCST: Anomaly detection using feature stability for packet-level traffic

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5 Author(s)
Bin Zhang ; Network Res. Center, Tsinghua Univ., Beijing, China ; Jiahai Yang ; Jianping Wu ; Donghong Qin
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In this paper, we present a statistical analysis of six traffic features based on entropy and distinct feature number at the packet level, and we find that, although these traffic features are unstable and show seasonal patterns like traffic volume for a long period, they are stable and consistent with Gaussian distribution in a short time period. However, this equilibrium property will be violated by some anomalies. Based on this observation, we propose a Multi-dimensional Clustering method for Short-time scale Traffic(MCST) to classify abnormal and normal traffic. We compare our new method to the well known wavelet technique. The detection result on synthetic anomaly traffic shows MCST can better detect the low-rate attacks than wavelet-based method, and detection result on real traffic demonstrates that MCST can detect more anomalies with low false alarm rate.

Published in:

Network Operations and Management Symposium (APNOMS), 2011 13th Asia-Pacific

Date of Conference:

21-23 Sept. 2011

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