A Precise and Efficient Evaluation of the Proximity Between Web Clients and Their Local DNS Servers
ATEC '02 Proceedings of the General Track of the annual conference on USENIX Annual Technical Conference
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Abstract This paper proposes a novel protocol which uses the Internet Domain Name System (DNS) to partition Web clients into disjoint sets, each of which is associated with a single DNS server. We define an L-DNS cluster to be a grouping of Web Clients that use the same Local DNS server to resolve Internet host names. We identify such clusters in real-time using data obtained from a Web Server in conjunction with that server''s Authoritative DNS---both instrumented with an implementation of our clustering algorithm. Using these clusters, we perform measurements from four distinct Internet locations. Our results show that L-DNS clustering enables a better estimation of proximity of a Web Client to a Web Server than previously proposed techniques. Thus, in a Content Distribution Network, a DNS-based scheme that redirects a request from a web client to one of many servers based on the client''s name server coordinates (e.g., hops/latency/loss-rates between the client and servers) would perform better with our algorithm.