Abstract: Clear and Present Increase of AAAA Queries

Tsuyoshi Toyono and Katsuyasu Toyama, NTT Labs

Current major operating systems that support IPv6 send AAAA queries for any name resolution prior to resolving A records, which doubles the number of queries and increases user response time. Because Windows Vista, which will be released in 2006, enables IPv6 by default, operators of DNS cache servers should prepare for this increase. In addition, many OSes may send multiple queries for single name resolution when the record is not found, by completing local domain names. While the completion is useful, it increases the load of DNS cache servers.

We show how the combination of AAAA query and domain name completion increases the number of queries. We will also discuss the effects of this increase on cache server operation and user response time, and explain how to decrease the needless queries.

About the Presenters
Tsuyoshi Toyono joined NTT Laboratories in 2003, and is engaged in DNS traffic measurement and analysis. He is a member of the Information Processing Society of Japan (IPSJ) and the WIDE Project.

Katsuyasu Toyama is a senior research engineer at NTT Laboratories. He was involved with the establishment of the first Japanese datacenter company, Internet Multifeed Co., in 1997, and there he designed JPNAP's network and services in 2000. His current interests focus on bridging network operations and network research, especially the core technologies of the Internet, such as interdomain routing, name resolution, and security.

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