Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/58863
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Type: Conference paper
Title: Internet optometry: Assessing the broken glasses in internet reachability
Author: Bush, R.
Maennel, O.
Roughan, M.
Uhlig, S.
Citation: IMC '09: Proceedings of the 9th ACM SIGCOMM Conference on Internet Measurement Conference, 2009: pp.242-253
Publisher: ACM
Publisher Place: New York
Issue Date: 2009
ISBN: 9781605587714
Conference Name: Internet Measurement Conference (2009 : Chicago, Ill.)
Statement of
Responsibility: 
Randy Bush, Olaf Maennel, Matthew Roughan, Steve Uhlig
Abstract: Reachability is thought of as the most basic service provided by today's Internet. Unfortunately, this does not imply that the community has a deep understanding of it. Researchers and operators rely on two views of reachability: control/routing- and data-plane measurements, but both types of measurements suffer from biases and limitations. In this paper, we illustrate some of these biases, and show how to design controlled experiments which allow us to "see" through the limitations of previous measurement techniques. For example, we discover the extent of default routing and its impact on reachability. This explains some of the previous unexpected results from studies that compared control- and data-plane measurements. However, not all limitations of visibility given by routing and probing tools can be compensated for by methodological improvements. We will show in this paper, that some of the limitations can be carefully addressed when designing an experiment, e.g. not seeing the reverse path taken by a probe can be partly compensated for by our methodology, called dual probing. However, compensating for other biases through more measurements may not always be possible. Therefore, calibration of expectations and checks of assumptions are critical when conducting measurements that aim at making conclusions about topological properties of the Internet.
Keywords: control-plane; data-plane; default-routing; limitation of data; reachability; routing
Rights: Copyright 2009 ACM
RMID: 0020097161
DOI: 10.1145/1644893.1644923
Published version: http://www.informatik.uni-trier.de/~ley/db/conf/imc/imc2009.html
Appears in Collections:Mathematical Sciences publications

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