2006 USENIX Annual Technical Conference Abstract
Pp. 369–374 of the Proceedings
How DNS Misnaming Distorts Internet Topology Mapping
Ming Zhang, Microsoft Research; Yaoping Ruan, IBM Research; Vivek Pai and Jennifer Rexford, Princeton University
Abstract
Network researchers commonly use reverse DNS lookups of router names
to provide geographic or topological information that would otherwise
be difficult to obtain. By systematically examining a large ISP, we
find that some of these names are incorrect. We develop techniques to
automatically identify these misnamings, and determine the actual
locations, which we validate against the configuration of the ISP's
routers. While the actual number of misnamings is small, these errors
induce a large number of false links in the inferred connectivity
graph. We also measure the effects on path inflation, and find that
the misnamings make path inflation and routing problems appear much
worse than they actually are.
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