Internet DRAFT - draft-esibov-dnsop-suppress-queries
draft-esibov-dnsop-suppress-queries
DNSOP Working Group Levon Esibov
INTERNET-DRAFT Stuart Kwan
Category: Best Current Practice Microsoft
<draft-esibov-dnsop-suppress-queries-00.txt>
February 22, 2001
Suppressing DNS queries to the names under reserved top level domains
Status of this Memo
This document is an Internet-Draft and is in full conformance with all
provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering Task
Force (IETF), its areas, and its working groups. Note that other groups
may also distribute working documents as Internet- Drafts.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference material
or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at
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The list of Internet-Draft Shadow Directories can be accessed at
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This document specifies an Internet Best Current Practices for the
Internet Community, and requests discussion and suggestions for
improvements. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2001). All Rights Reserved.
Abstract
A set of top level domains was recently reserved for testing and
documentation purposes. Currently, there is work in progress to reserve
a top level domain to be used only in private networks. It is inevitable
that some DNS queries for the names under these domains will leak to the
Internet. To prevent the load of such ineffectual queries on the root
servers, special configuration of the public DNS servers is recommended
in this document.
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1. Introduction
RFC 2606 [RFC2606] specifies a set of top level domains reserved for
testing and documentation purposes. Currently, there is work in progress
to reserve a top level domain to be used only in private networks [PRI].
Queries for any names under these domains are not intended to be
resolved on the Internet. It is inevitable that some DNS queries for the
names under these domains will leak to the Internet. To prevent the load
of such ineffectual queries on the root DNS servers, special
configuration of the public DNS servers is recommended in this document.
In this document, the key words "MAY", "MUST, "MUST NOT", "optional",
"recommended", "SHOULD", and "SHOULD NOT", are to be interpreted as
described in [RFC2119].
2. Recommended configuration of the DNS servers.
To prevent DNS queries for names under the reserved domains (domains
with names not intended to be resolved on the Internet) from being sent
to the root DNS servers, it is recommended that DNS servers on the
Internet are configured as primary for all of the zones corresponding to
the reserved domains. These zones do not need to contain any data except
the required SOA and NS records at the top of the zone.
List of such zones includes
.test
.example
.invalid
.localhost
.pri (not reserved yet)
Such a list may grow with the introduction of new reserved domains that
are not intended for use on the Internet.
3. Example
When a query for any record set for a name host.example is received by
any Internet DNS server, the DNS server will respond to such a query
with a NXDOMAIN response, thus suppressing unnecessary recursive
resolution and saving network resources, the resources on the DNS server
itself, and the resources on the root servers.
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4. IANA Considerations
IANA's consideration is not required. The list of the domains for which
the zones should be created is reserved by IANA.
5. Security Considerations
This draft does not introduce any additional security concerns.
6. Acknowledgements
We would like to thank Michael Cretzman for his review of this document.
7. Authors' Addresses
Levon Esibov
Microsoft Corporation
One Microsoft Way
Redmond, WA 98052
EMail: levone@microsoft.com
Stuart Kwan
Microsoft Corporation
One Microsoft Way
Redmond, WA 98052
EMail: skwan@microsoft.com
8. References
[RFC 2606] Eastlake & Panitz, "Reserved Top Level DNS Names" BCP32,
RFC 2606, June 1999.
[PRI] Coffey, S., Strain, S., Esibov, L., "DNS Top Level Domain
For Private Networks in the Domain Name System (DNS UPDATE)",
draft-coffeystrain-dnsext-privatednstld-00.txt, work in
progress.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
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9. Intellectual Property Statement
The IETF takes no position regarding the validity or scope of any
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The IETF invites any interested party to bring to its attention any
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10. Full Copyright Statement
Copyright (C) The Internet Society (2001). All Rights Reserved.
This document and translations of it may be copied and furnished to
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11. Expiration Date
This memo is filed as <draft-esibov-dnsext-dynupdtld-00.txt>, and
expires August 22, 2001.
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