|
Security 2001 Paper   
[Security '01 Tech Program Index]
Next: Introduction MULTOPS: A Data-Structure for Bandwidth Attack DetectionThomer M. Gil and Massimiliano Poletto
Abstract:A denial-of-service bandwidth attack is an attempt to disrupt an online service by generating a traffic overload that clogs links or causes routers near the victim to crash. We propose a heuristic and a data-structure that network devices (such as routers) can use to detect (and eliminate) such attacks. With our method, each network device maintains a data-structure, MULTOPS, that monitors certain traffic characteristics. MULTOPS (MUlti-Level Tree for Online Packet Statistics) is a tree of nodes that contains packet rate statistics for subnet prefixes at different aggregation levels. The tree expands and contracts within a fixed memory budget. A network device using MULTOPS detects ongoing bandwidth attacks by the significant, disproportional difference between packet rates going to and coming from the victim or the attacker. MULTOPS-equipped routing software running on an off-the-shelf 700 Mhz Pentium III PC can process up to 340,000 packets per second.
2001-05-11 |
This paper was originally published in the
Proceedings of the 10th USENIX Security Symposium,
August 1317, 2001, Washington, D.C., USA
Last changed: 2 Jan. 2002 ml |
|