I-D ACTION:draft-ietf-dnsind-ncache-06.txt

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A New Internet-Draft is available from the on-line Internet-Drafts
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This draft is a work item of the DNS IXFR, Notification, and Dynamic Update
Working Group of the IETF.

	Title           : Negative Caching of DNS Queries (DNS NCACHE)
	Author(s)       : M. Andrews
	Filename        : draft-ietf-dnsind-ncache-06.txt
	Pages           : 16
	Date            : 1997-09-03

[RFC1034] provided a description of how to cache negative
responses.  It however had a fundamental flaw in that it did not allow a name
server to hand out those cached responses to other
resolvers, thereby greatly reducing the effect of the caching.

This document addresses issues raise in the light of experience
and replaces [RFC1034 Section 4.3.4].

Negative caching was an optional part of the DNS specification
and deals with the caching of the non-existence of an RRset
[RFC2181] or domain name.

Negative caching is useful as it reduces the response time for
negative answers.  It also reduces the number of messages that
have to be sent between resolvers and name servers hence overall
network traffic.  A large proportion of DNS traffic on the
Internet could be eliminated if all resolvers implemented negative caching.
With this in mind negative caching should no
longer be seen as an optional part of a DNS resolver.

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