``Strong cache consistency support for domain name system"

Xin Chen, Haining Wang, Shansi Ren, and Xiaodong Zhang 

A poster presentation in SIGCOMM'04, Portland, Oregon, August 30 - September 
3, 2004. 

Abstract

Caching is critical to the performance and scalability of Domain Name
System (DNS). However, DNS only supports weak cache consistency by using
Time-To-Live (TTL) mechanism. Without strong cache consistency among DNS
servers, it is not only cumbersome and inefficient to invalidate
out-of-date cache entries, but also highly likely to lose connection
services due to cache inconsistency. The loss of service availability is
a much more serious problem than the service degradation.
We propose an active DNS cache update protocol, called DNScup,
to maintain strong cache consistency. Our trace-driven
simulation and prototype implementation demonstrate that DNScup
achieves the strong cache consistency of DNS, and hence, significantly
improves its availability, performance and scalability.

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