SYN-dog: Sniffing SYN Flooding Sources

  • Authors:
  • Haining Wang;Danlu Zhang;Kang G. Shin

  • Affiliations:
  • -;-;-

  • Venue:
  • ICDCS '02 Proceedings of the 22 nd International Conference on Distributed Computing Systems (ICDCS'02)
  • Year:
  • 2002

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Abstract

This paper presents a simple and robust mechanism called SYN-dog to sniff SYN flooding sources. We install SYN-dog as a software agent at leaf routers that connect stub networks to the Internet. The statelessness and low computation overhead of SYN-dog make itself immune to any flooding attacks. The core mechanism of SYN-dog is based on the protocol behavior of TCP SYN-SYN/ACK pairs, and is an instance of the Sequential Change Detection [1]. To make SYN-dog insensitive to site and access pattern, a non-parametric CumulativeSum (CUSUM) method [4] is applied, thus making SYN-dog much more generally applicable and its deployment much easier. Due to its proximity to the flooding sources, SYN-dog can trace the flooding sources without resorting to expensive IP traceback.