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Wolfgang Mühlbauer's Publications

Comparing DNS Resolvers in the Wild
Citation key AMSU-CDRW-10
Author Ager, Bernhard and Mühlbauer, Wolfgang and Smaragdakis, Georgios and Uhlig, Steve
Title of Book Proceedings of Internet Measurement Conference (IMC '10)
Pages 15–21
Year 2010
ISBN 978-1-4503-0483-2
DOI http://dx.doi.org/10.1145/1879141.1879144
Location Melbourne, Australia
Address New York, NY, USA
Month November
Publisher ACM
Abstract The Domain Name System (DNS) is a fundamental building block of the Internet. Today, the performance of more and more applications depend not only on the responsiveness of DNS, but also the exact answer returned by the queried DNS resolver, e.g., for Content Distribution Networks (CDN). In this paper, we compare local DNS resolvers against GoogleDNS and OpenDNS for a large set of vantage points. Our end-host measurements inside 50 commercial ISPs reveal that two aspects have a significant impact on responsiveness: (1) the latency to the DNS resolver, (2) the content of the DNS cache when the query is issued. We also observe significant diversity, even at the AS-level, among the answers provided by the studied DNS resolvers. We attribute this diversity to the location-awareness of CDNs as well as to the location of DNS resolvers that breaks the assumption made by CDNs about the vicinity of the end-user and its DNS resolver. Our findings pinpoint limitations within the DNS deployment of some ISPs, as well as the way third-party DNS resolvers bias DNS replies.
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