Macroscopic Internet Topology and Performance Measurements From the DNS Root Name Servers
Macroscopic Internet Topology and Performance Measurements From the DNS Root Name Servers
Marina Fomenkov, kc claffy, Bradley Huffaker, and David Moore
Cooperative Association for Internet Data Analysis - CAIDA
San Diego Supercomputer Center,
University of California, San Diego
We describe active measurements of topology and end-to-end latency characteristics between several of the DNS root servers and a subset of their clients using the skitter tool developed by CAIDA. We gather a sample of clients for each monitored DNS root server, combine these samples into a common target list and then actively probe these targets and analyze their
connectivity.
We identify the subsets of destinations that have large latency connections to all
instrumented root name servers and discuss their geographical make-up. Our goal is to build an
analytical framework for evaluating the optimality of root server placement and its impact on the
efficiency of the DNS service. The skitter tool and the methodology we propose can also be used
for monitoring the end-to-end performance in large networks and for assessing the optimality of
web servers placement in general.
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