Aggressive use of NSEC/NSEC3

Document Type Replaced Internet-Draft (dnsop WG)
Last updated 2016-03-17
Replaced by draft-ietf-dnsop-nsec-aggressiveuse
Stream IETF
Intended RFC status (None)
Expired & archived
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Stream WG state Adopted by a WG
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-dnsop-nsec-aggressiveuse
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This Internet-Draft is no longer active.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.)