NANOG Meeting Presentation Abstract

Name Server Selection of DNS Caching Resolvers
Meeting:	NANOG54
Date / Time:	2012-02-07 3:30pm - 4:00pm
Room:	California Ballroom
Presenters:	Speakers: Yingdi Yu, UCLA Yingdi Yu is a second-year Ph.D. student in Computer Science Department at UCLA. He is also a member of the Internet Research Lab at UCLA. His research interest focuses on Internet measurement, especially DNS measurement. Before coming to UCLA, he received his B.S. degree and M.S. degree in Eletronic Engineering from Shanghai Jiao Tong University in 2007 and 2010 respectively.
Abstract:	Operators of high-profile DNS zones utilize multiple authoritative name servers for performance and robustness. We conducted a series trace-driven measurements to understand how current caching resolver implementations select and distribute queries among a set of authoritative name servers. Our results reveal areas for improvement in the “apparently sound” server selection schemes used by some popular implementations. In some cases, the selection schemes lead to sub-optimal behavior of caching resolvers, e.g. sending a significant amount of queries to unresponsive servers. We believe that most of these issues are caused by careless implementations, such as treating unresponsive servers as reachable, and using constant SRTT decaying factor which couples the decaying speed with the iterative query rate. For the problems identified in this work, we recommended corresponding solutions.
Files:	Name Server Selection of DNS Caching Resolvers Yu(PDF)
Sponsors:	None.

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