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Summary: On the Use of Anycast in DNS
Sandeep Sarat
Johns Hopkins University
sarat@cs.jhu.edu
Vasileios Pappas
UCLA
vpappas@cs.ucla.edu
Andreas Terzis
Johns Hopkins University
terzis@cs.jhu.edu
Abstract
We present the initial results from our evaluation study on the per-
formance implications of anycast in DNS, using four anycast servers
deployed at top-level DNS zones. Our results show that 15% to
55% of the queries sent to an anycast group, are answered by the
topologically closest server and at least 10% of the queries expe-
rience an additional delay in the order of 100ms. While increased
availability is one of the supposed advantages of anycast, we found
that outages can last up to multiple minutes, mainly due to slow
BGP convergence. On the other hand, the number of outages ob-
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