Paper Info
Title
Comparing DNS resolvers in the wild
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.
Year
DOI
Venue
2010
10.1145/1879141.1879144
Internet Measurement Conference
Keywords
Field
DocType
significant diversity,dns resolvers,dns deployment,dns cache,third-party dns resolvers bias,local dns resolvers,content distribution networks,significant impact,dns resolver,commercial isps,measurement,domain name system
Resolver,Software deployment,Computer science,Latency (engineering),Cache,Distribution networks,Domain Name System,Computer network,DNS zone transfer,The Internet
Conference
Citations 
PageRank 
References 
55
2.93
9
Authors
4
Name
Order
Citations
PageRank
Bernhard Ager138121.20
Wolfgang Mühlbauer226416.45
Georgios Smaragdakis364744.52
Steve Uhlig453748.45