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Status: Verified (1)

RFC 7816, "DNS Query Name Minimisation to Improve Privacy", March 2016

Source of RFC: dnsop (ops)

Errata ID: 4644

Status: Verified
Type: Technical

Reported By: Robert Edmonds
Date Reported: 2016-03-24
Verifier Name: Joel Jaeggli
Date Verified: 2017-03-29

Section 6 says:

QNAME minimisation can decrease performance in some cases -- for
instance, for a deep domain name (like
www.host.group.department.example.com, where 
host.group.department.example.com is hosted on example.com's name
servers).  Let's assume a resolver that knows only the name servers of
.example.  Without QNAME minimisation, it would send these .example name
servers a query for www.host.group.department.example.com and
immediately get a specific referral or an answer, without the need for
more queries to probe for the zone cut.  For such a name, a cold
resolver with QNAME minimisation will, depending on how QNAME
minimisation is implemented, send more queries, one per label.  Once the
cache is warm, there will be no difference with a traditional resolver.
Actual testing is described in [Huque-QNAME-Min].  Such deep domains are
especially common under ip6.arpa.

It should say:

QNAME minimisation can decrease performance in some cases -- for 
instance, for a deep domain name (like
www.host.group.department.example.com, where 
host.group.department.example.com is hosted on example.com's name
servers).  Let's assume a resolver that knows only the name servers of
.example.com.  Without QNAME minimisation, it would send these 
.example.com name servers a query for 
www.host.group.department.example.com and immediately get a specific
referral or an answer, without the need for more queries to probe for
the zone cut.  For such a name, a cold resolver with QNAME minimisation
will, depending on how QNAME minimisation is implemented, send more
queries, one per label.  Once the cache is warm, there will be no
difference with a traditional resolver.  Actual testing is described in
[Huque-QNAME-Min].  Such deep domains are especially common under
ip6.arpa.

Notes:

Changed ".example" to ".example.com".

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