JSM 2005 - Toronto

Abstract #302511

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Legend: = Applied Session, = Theme Session, = Presenter
Activity Number: 346
Type: Invited
Date/Time: Wednesday, August 10, 2005 : 8:30 AM to 10:20 AM
Sponsor: Section on Physical and Engineering Sciences
Abstract - #302511
Title: Developments in Network Tomography
Author(s): Earl Lawrence and George Michailidis*+ and Vijayan Nair
Companies: University of Michigan and University of Michigan and University of Michigan
Address: 439 West Hall, Ann Arbor, MI, 48109-1092,
Keywords: Internet ; network ; tomography
Abstract:

The Internet is a rapidly changing and important environment. One minute your site sits in total obscurity. The next minute, your traffic is slashdotted into a frenzy. The minute after that, a bunch of hackers orchestrate a DDoS on your now popular internet domain. The minute after that, you return to obscurity as the flash crowds decide they can't get through and your site probably wasn't that interesting anyway. Monitoring and avoiding these issues has become an important field of study for both computer scientists and statisticians. In this talk, we will present procedures for estimating link-level packet loss rates and delay distributions based on end-to-end active measurements. Our active probing packets are considered part of spatio-temporal time series. Our scheme deconvolves the end-to-end data into a link-level model. Further, we present methods for monitoring this model in order to detect and locate changes over time. We allow the active measurements to be calibrated based on passive monitoring on selected links, and we explore issues involving the selection of probing experiments and the placement of link-level monitoring devices.

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Revised March 2005