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Erschienen in:
2011 | OriginalPaper | Buchkapitel
A Practical Approach to Portscan Detection in Very High-Speed Links
verfasst von : Jakub Mikians, Pere Barlet-Ros, Josep Sanjuàs-Cuxart, Josep Solé-Pareta
Erschienen in: Passive and Active Measurement
Verlag: Springer Berlin Heidelberg
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Port scans are continuously used by both worms and human attackers to probe for vulnerabilities in Internet facing systems. In this paper, we present a new method to efficiently detect TCP port scans in very high-speed links. The main idea behind our approach is to early discard those handshake packets that are not strictly needed to reliably detect port scans. We show that with just a couple of Bloom filters to track active servers and TCP handshakes we can easily discard about 85% of all handshake packets with negligible loss in accuracy. This significantly reduces both the memory requirements and CPU cost per packet. We evaluated our algorithm using packet traces and live traffic from 1 and 10 GigE academic networks. Our results show that our method requires less than 1 MB to accurately monitor a 10 Gb/s link, which perfectly fits in the cache memory of nowadays’ general-purpose processors.