DNS Opportunistic Refresh for Resolvers

Document Type Expired Internet-Draft (individual)
Authors Mukund Sivaraman  , Shane Kerr  , Stephen Morris 
Last updated 2018-01-01 (latest revision 2017-06-30)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document describes a mechanism whereby a DNS resolver can opportunistically refresh the TTLs of cached records of a zone using serial number information carried in responses from the zone's nameservers. As well as improving resolver response time by reducing the need to make upstream queries, the mechanism can also reduce the workload of authoritative servers.


Mukund Sivaraman (muks@isc.org)
Shane Kerr (shane@timetravellers.org)
Stephen Morris (stephen@isc.org)

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