LISA 2001 Abstract
DNS Root/gTLD Performance Measurement
Nevil Brownlee, The University of Auckland, New
Zealand and CAIDA, SDSC, UC San Diego; kc claffy, CAIDA, SDSC UC San Diego; Evi Nemeth, University of Colorado and CAIDA, SDSC, UC San Diego
The Internet Domain Name System (DNS) is an essential part of the
Internet infrastructure. Each web site or email lookup involves
traversing a tree-structured distributed database to complete the
mapping from a hostname to an IP address. The root and top level
domain (TLD) nameservers form the highest level of authority over the
Internet naming hierarchy, and are thus potentially involved in
reaching any and every URL or email address we seek. We use passive
measurements to analyze performance of these critical nameservers from
a client network's viewpoint.
We use NeTraMet meters on a university campus to take passive
measurements of DNS response time, request loss rate and request load
to the root and gTLD (generic top level domain, e.g., .com, .net,
From these measurements we produce strip charts that are useful
for day-to-day monitoring of one's Internet connectivity, since they
reveal changes in network behavior on paths between one's local
network and the global servers without the need to actively inject
traffic into the network. We are developing a monitoring tool to
produce such plots in near real time.
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