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Sensitivity of PCA for traffic anomaly detection

Ringberg, Haakon, Soule, Augustin, Rexford, Jennifer, Diot, Christophe·2007·Proceedings of the 2007 ACM SIGMETRICS international conference on Measurement and modeling of computer systems

Abstract

Detecting anomalous traffic is a crucial part of managing IP networks. In recent years, network-wide anomaly de-tection based on Principal Component Analysis (PCA) has emerged as a powerful method for detecting a wide vari-ety of anomalies. We show that tuning PCA to operate effectively in practice is difficult and requires more robust techniques than have been presented thus far. We analyze a week of network-wide traffic measurements from two IP backbones (Abilene and Geant) across three different traffic aggregations (ingress routers, OD flows, and input links), and conduct a detailed inspection of the feature time se-ries for each suspected anomaly. Our study identifies and evaluates four main challenges of using PCA to detect traf-fic anomalies: (i) the false positive rate is very sensitive to small differences in the number of principal components in the normal subspace, (ii) the effectiveness of PCA is sensi-tive to the level of aggregation of the traffic measurements, (iii) a large anomaly may inadvertently pollute the normal subspace, (iv) correctly identifying which flow triggered the anomaly detector is an inherently challenging problem.

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Metadata

Authors
Ringberg, H., Soule, A., Rexford, J., & Diot, C.
Venue
Proceedings of the 2007 ACM SIGMETRICS international conference on Measurement and modeling of computer systems
Publisher
ACM
Published
2007-06-12
Pages
109-120
OpenAlex
W2118931532
Cited by
353
References
17
FWCI
17.41
Type
conference paper
Language
en
Open access
closed

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CoChat. (2026). Citation check: Sensitivity of PCA for traffic anomaly detection. https://app.cochat.ai/papers/10.1145/1254882.1254895
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Ringberg, H., Soule, A., Rexford, J., & Diot, C. (2007). Sensitivity of PCA for traffic anomaly detection. Proceedings of the 2007 ACM SIGMETRICS international conference on Measurement and modeling of computer systems. https://doi.org/10.1145/1254882.1254895

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