USENIX Technical Program - Abstract - Internet Technologies & Systems 99
Rapid Reverse DNS Lookups for Web Servers
William LeFebvre, Group sys Consulting; and Ken Craig, CNN Internet Technologies
When a web server wants to learn the domain
name of one of its clients, it must perform a lookup in the Domain Name
System's "reverse domain", in-addr.arpa . These lookups can take
time and may have an adverse impact on the web server's response to its
clients. Rapid DNS is an intermediate client/server system that operates
between a web server and a DNS server. It provides caching of the results
and, more importantly, limits web server lookups to the data contained
in the cache. This provides a significant improvement in response time
for situations in which knowledge of the hostname is not critical to the
web server's operation. The Rapid DNS system was implemented for use in
the web farm that serves the collection of Cable News Network (CNN) sites.
Its design is presented, along with measurements of its performance in
the CNN environment.
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