RSSAC003 - RSSAC Report on Root Zone TTLs
Venue
ICANN Root Server System Advisory Committee ( RSSAC ) Reports and Advisories, Internet Corporation for Assigned Names and Numbers (ICANN) (2015), pp. 35
Publication Year
2015
Authors
BibTeX
Abstract
Root zone TTLs have not changed since 1999. In this report, the RSSAC Caucus
studies the extent to which the current root zone TTLs are still appropriate for
today’s Internet environment. Selecting a TTL for a given resource record involves
finding the right balance between a few tradeoffs. Intuitively, shorter TTLs are
beneficial for data that changes frequently, whereas longer TTLs are beneficial for
data that is relatively stable. Related to this, longer TTLs provide robustness in
the event of operational failures. All other things being equal, and assuming
software involved in queries and responses follow the DNS protocol standards,
shorter TTLs generally result in higher query rates, and longer TTLs result in
lower query rates.
