Aggressive use of NSEC/NSEC3

Document Type Replaced Internet-Draft (dnsop WG)
Authors Kazunori Fujiwara  , Akira Kato 
Last updated 2016-03-17
Replaced by RFC 8198
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state Adopted by a WG
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-dnsop-nsec-aggressiveuse
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


While DNS highly depends on cache, its cache usage of non-existence information has been limited to exact matching. This draft proposes the aggressive use of a NSEC/NSEC3 resource record, which is able to express non-existence of a range of names authoritatively. With this proposal, it is expected that shorter latency to many of negative responses as well as some level of mitigation of random sub-domain attacks (referred to as "Water Torture" attacks). It is also expected that non-existent TLD queries to Root DNS servers will decrease.


Kazunori Fujiwara (
Akira Kato (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)