TOC 
Network Working GroupM. Andrews
Internet-DraftISC
Intended status: BCPMay 1, 2010
Expires: November 2, 2010 


Locally-served DNS Zones
draft-ietf-dnsop-default-local-zones-13

Abstract

Experience with the Domain Name System (DNS) has shown that there are a number of DNS zones all iterative resolvers and recursive nameservers should automatically serve, unless configured otherwise. RFC 4193 specifies that this should occur for D.F.IP6.ARPA. This document extends the practice to cover the IN-ADDR.ARPA zones for RFC 1918 address space and other well known zones with similar characteristics.

Status of this Memo

This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.

Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at http://datatracker.ietf.org/drafts/current/.

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.”

This Internet-Draft will expire on November 2, 2010.

Copyright Notice

Copyright (c) 2010 IETF Trust and the persons identified as the document authors. All rights reserved.

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Table of Contents

1.  Introduction
    1.1.  Reserved Words
2.  Effects on sites using RFC 1918 addresses.
3.  Changes to Iterative Resolver Behaviour.
4.  Lists Of Zones Covered
    4.1.  RFC1918 Zones
    4.2.  RFC5735 and RFC5737 Zones
    4.3.  Local IPv6 Unicast Addresses
    4.4.  IPv6 Locally Assigned Local Addresses
    4.5.  IPv6 Link Local Addresses
    4.6.  IPv6 Example Prefix
    4.7.  ORCHID Prefix
5.  Zones that are Out-Of-Scope
6.  IANA Considerations
7.  Security Considerations
8.  Acknowledgements
9.  References
    9.1.  Normative References
    9.2.  Informative References
Appendix A.  Change History [To Be Removed on Publication]
    A.1.  draft-ietf-dnsop-default-local-zones-13.txt
    A.2.  draft-ietf-dnsop-default-local-zones-12.txt
    A.3.  draft-ietf-dnsop-default-local-zones-11.txt
    A.4.  draft-ietf-dnsop-default-local-zones-10.txt
    A.5.  draft-ietf-dnsop-default-local-zones-09.txt
    A.6.  draft-ietf-dnsop-default-local-zones-08.txt
    A.7.  draft-ietf-dnsop-default-local-zones-07.txt
    A.8.  draft-ietf-dnsop-default-local-zones-06.txt
    A.9.  draft-ietf-dnsop-default-local-zones-05.txt
    A.10.  draft-ietf-dnsop-default-local-zones-04.txt
    A.11.  draft-ietf-dnsop-default-local-zones-03.txt
    A.12.  draft-ietf-dnsop-default-local-zones-02.txt
    A.13.  draft-ietf-dnsop-default-local-zones-01.txt
    A.14.  draft-ietf-dnsop-default-local-zones-00.txt
    A.15.  draft-andrews-full-service-resolvers-03.txt
    A.16.  draft-andrews-full-service-resolvers-02.txt
§  Author's Address




 TOC 

1.  Introduction

Experience with the Domain Name System (DNS, [RFC1034] (Mockapetris, P., “DOMAIN NAMES - CONCEPTS AND FACILITIES,” November 1987.) and [RFC1035] (Mockapetris, P., “DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION,” November 1987.)) has shown that there are a number of DNS zones that all iterative resolvers and recursive nameservers SHOULD automatically serve, unless intentionally configured otherwise. These zones include, but are not limited to, the IN-ADDR.ARPA zones for the address space allocated by [RFC1918] (Rekhter, Y., Moskowitz, B., Karrenberg, D., de Groot, G., and E. Lear, “Address Allocation for Private Internets,” February 1996.) and the IP6.ARPA zones for locally assigned unique local IPv6 addresses defined in [RFC4193] (Hinden, R. and B. Haberman, “Unique Local IPv6 Unicast Addresses,” October 2005.).

This recommendation is made because data has shown that significant leakage of queries for these name spaces is occurring, despite instructions to restrict them, and because it has therefore become necessary to deploy sacrificial name servers to protect the immediate parent name servers for these zones from excessive, unintentional, query load [AS112] (, “AS112 Project,” .) [I‑D.draft‑ietf‑dnsop‑as112‑ops] (Abley, J. and W. Maton, “AS112 Nameserver Operations,” October 2009.) [I‑D.draft‑ietf‑dnsop‑as112‑under‑attack‑help‑help] (Abley, J. and W. Maton, “I'm Being Attacked by PRISONER.IANA.ORG!,” October 2009.). There is every expectation that the query load will continue to increase unless steps are taken as outlined here.

Additionally, queries from clients behind badly configured firewalls that allow outgoing queries for these name spaces but drop the responses, put a significant load on the root servers (forward but no reverse zones configured). They also cause operational load for the root server operators as they have to reply to enquiries about why the root servers are "attacking" these clients. Changing the default configuration will address all these issues for the zones listed in Section 4 (Lists Of Zones Covered).

[RFC4193] (Hinden, R. and B. Haberman, “Unique Local IPv6 Unicast Addresses,” October 2005.) recommends that queries for D.F.IP6.ARPA be handled locally. This document extends the recommendation to cover the IN-ADDR.ARPA zones for [RFC1918] (Rekhter, Y., Moskowitz, B., Karrenberg, D., de Groot, G., and E. Lear, “Address Allocation for Private Internets,” February 1996.) and other well known IN-ADDR.ARPA and IP6.ARPA zones for which queries should not appear on the public Internet.

It is hoped that by doing this the number of sacrificial servers [AS112] (, “AS112 Project,” .) will not have to be increased, and may in time be reduced.

This recommendation should also help DNS responsiveness for sites which are using [RFC1918] (Rekhter, Y., Moskowitz, B., Karrenberg, D., de Groot, G., and E. Lear, “Address Allocation for Private Internets,” February 1996.) addresses but do not follow the last paragraph in Section 3 of [RFC1918] (Rekhter, Y., Moskowitz, B., Karrenberg, D., de Groot, G., and E. Lear, “Address Allocation for Private Internets,” February 1996.).



 TOC 

1.1.  Reserved Words

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119] (Bradner, S., “Key words for use in RFCs to Indicate Requirement Levels,” March 1997.).



 TOC 

2.  Effects on sites using RFC 1918 addresses.

For most sites using [RFC1918] (Rekhter, Y., Moskowitz, B., Karrenberg, D., de Groot, G., and E. Lear, “Address Allocation for Private Internets,” February 1996.) addresses, the changes here will have little or no detrimental effect. If the site does not already have the reverse tree populated the only effect will be that the name error responses will be generated locally rather than remotely.

For sites that do have the reverse tree populated, most will either have a local copy of the zones or will be forwarding the queries to servers which have local copies of the zone. Therefore this recommendation will not be relevant.

The most significant impact will be felt at sites that make use of delegations for [RFC1918] (Rekhter, Y., Moskowitz, B., Karrenberg, D., de Groot, G., and E. Lear, “Address Allocation for Private Internets,” February 1996.) addresses and have populated these zones. These sites will need to override the default configuration expressed in this document to allow resolution to continue. Typically, such sites will be fully disconnected from the Internet and have their own root servers for their own non-Internet DNS tree.



 TOC 

3.  Changes to Iterative Resolver Behaviour.

Unless configured otherwise, an iterative resolver will now return authoritatively (aa=1) name errors (RCODE=3) for queries within the zones in Section 4 (Lists Of Zones Covered), with the obvious exception of queries for the zone name itself where SOA, NS and "no data" responses will be returned as appropriate to the query type. One common way to do this all at once is to serve empty (SOA and NS only) zones.

An implementation of this recommendation MUST provide a mechanism to disable this new behaviour, and SHOULD allow this decision on a zone by zone basis.

If using empty zones one SHOULD NOT use the same NS and SOA records as used on the public Internet servers as that will make it harder to detect the origin of the responses and thus any leakage to the public Internet servers. This document recommends that the NS record defaults to the name of the zone and the SOA MNAME defaults to the name of the only NS RR's target. The SOA RNAME should default to "nobody.invalid." [RFC2606] (Eastlake, D. and A. Panitz, “Reserved Top Level DNS Names,” June 1999.). Implementations SHOULD provide a mechanism to set these values. No address records need to be provided for the name server.

Below is an example of a generic empty zone in master file format. It will produce a negative cache TTL of 3 hours.

@ 10800 IN SOA @ nobody.invalid. 1 3600 1200 604800 10800
@ 10800 IN NS @

The SOA RR is needed to support negative caching [RFC2308] (Andrews, M., “Negative Caching of DNS Queries (DNS NCACHE),” March 1998.) of name error responses and to point clients to the primary master for DNS dynamic updates.

SOA values of particular importance are the MNAME, the SOA RR's TTL and the negTTL value. Both TTL values SHOULD match. The rest of the SOA timer values MAY be chosen arbitrarily since they are not intended to control any zone transfer activity.

The NS RR is needed as some UPDATE [RFC2136] (Vixie, P., Thomson, A., Rekhter, Y., and J. Bound, “Dynamic Updates in the Domain Name System (DNS UPDATE),” April 1997.) clients use NS queries to discover the zone to be updated. Having no address records for the name server is expected to abort UPDATE processing in the client.



 TOC 

4.  Lists Of Zones Covered

The following subsections are intended to seed the IANA registry as requested in the IANA Considerations Section. The zone name is the entity to be registered.



 TOC 

4.1.  RFC1918 Zones

The following zones correspond to the IPv4 address space reserved in [RFC1918] (Rekhter, Y., Moskowitz, B., Karrenberg, D., de Groot, G., and E. Lear, “Address Allocation for Private Internets,” February 1996.).

Zone
10.IN-ADDR.ARPA
16.172.IN-ADDR.ARPA
17.172.IN-ADDR.ARPA
18.172.IN-ADDR.ARPA
19.172.IN-ADDR.ARPA
20.172.IN-ADDR.ARPA
21.172.IN-ADDR.ARPA
22.172.IN-ADDR.ARPA
23.172.IN-ADDR.ARPA
24.172.IN-ADDR.ARPA
25.172.IN-ADDR.ARPA
26.172.IN-ADDR.ARPA
27.172.IN-ADDR.ARPA
28.172.IN-ADDR.ARPA
29.172.IN-ADDR.ARPA
30.172.IN-ADDR.ARPA
31.172.IN-ADDR.ARPA
168.192.IN-ADDR.ARPA



 TOC 

4.2.  RFC5735 and RFC5737 Zones

The following zones correspond to those address ranges from [RFC5735] (Cotton, M. and L. Vergoda, “Special-Use IPv4 Addresses,” January 2010.) and [RFC5737] (Arkko, J., Cotton, M., and L. Vergoda, “IPv4 Address Blocks Reserved for Documentation,” January 2010.) that are not expected to appear as source or destination addresses on the public Internet and to not have a unique name to associate with.

The recommendation to serve an empty zone 127.IN-ADDR.ARPA is not a attempt to discourage any practice to provide a PTR RR for 1.0.0.127.IN-ADDR.ARPA locally. In fact, a meaningful reverse mapping should exist, but the exact setup is out of the scope of this document. Similar logic applies to the reverse mapping for ::1 (Section 4.3 (Local IPv6 Unicast Addresses)). The recommendations made here simply assume no other coverage for these domains exists.

ZoneDescription
0.IN-ADDR.ARPA IPv4 "THIS" NETWORK
127.IN-ADDR.ARPA IPv4 LOOP-BACK NETWORK
254.169.IN-ADDR.ARPA IPv4 LINK LOCAL
2.0.192.IN-ADDR.ARPA IPv4 TEST NET 1
100.51.198.IN-ADDR.ARPA IPv4 TEST NET 2
113.0.203.IN-ADDR.ARPA IPv4 TEST NET 3
255.255.255.255.IN-ADDR.ARPA IPv4 BROADCAST



 TOC 

4.3.  Local IPv6 Unicast Addresses

The reverse mappings ([RFC3596] (Thomson, S., Huitema, C., Ksinant, V., and M. Souissi, “DNS Extensions to Support IPv6,” October 2003.), Section 2.5 IP6.ARPA Domain) for the IPv6 Unspecified (::) and Loopback (::1) addresses ([RFC4291] (Hinden, R. and S. Deering, “IP Version 6 Addressing Architecture,” February 2006.), Sections 2.4, 2.5.2 and 2.5.3) are covered by these two zones:

Zone
0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.\
    0.0.0.0.0.0.0.0.0.0.0.0.IP6.ARPA
1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.\
    0.0.0.0.0.0.0.0.0.0.0.0.IP6.ARPA

Note: Line breaks and a escapes '\' have been inserted above for readability and to adhere to line width constraints. They are not parts of the zone names.



 TOC 

4.4.  IPv6 Locally Assigned Local Addresses

Section 4.4 of [RFC4193] (Hinden, R. and B. Haberman, “Unique Local IPv6 Unicast Addresses,” October 2005.) already required special treatment of:

Zone
D.F.IP6.ARPA



 TOC 

4.5.  IPv6 Link Local Addresses

IPv6 Link-Local Addresses as of [RFC4291] (Hinden, R. and S. Deering, “IP Version 6 Addressing Architecture,” February 2006.), Section 2.5.6 are covered by four distinct reverse DNS zones:

Zone
8.E.F.IP6.ARPA
9.E.F.IP6.ARPA
A.E.F.IP6.ARPA
B.E.F.IP6.ARPA



 TOC 

4.6.  IPv6 Example Prefix

IPv6 example prefix [RFC3849] (Huston, G., Lord, A., and P. Smith, “IPv6 Address Prefix Reserved for Documentation,” July 2004.).

Zone
8.B.D.0.1.0.0.2.IP6.ARPA

Note: 8.B.D.0.1.0.0.2.IP6.ARPA is not being used as an example here.



 TOC 

4.7.  ORCHID Prefix

[RFC4843] (Nikander, P., Laganier, J., and F. Dupont, “An IPv6 Prefix for Overlay Routable Cryptographic Hash Identifiers (ORCHID),” April 2007.).

Zone
0.1.1.0.0.2.IP6.ARPA



 TOC 

5.  Zones that are Out-Of-Scope

IPv6 site-local addresses (deprecated, see [RFC4291] (Hinden, R. and S. Deering, “IP Version 6 Addressing Architecture,” February 2006.) Sections 2.4 and 2.5.7), and IPv6 Non-Locally Assigned Local addresses ([RFC4193] (Hinden, R. and B. Haberman, “Unique Local IPv6 Unicast Addresses,” October 2005.)) are not covered here.

It is expected that IPv6 site-local addresses will be self correcting as IPv6 implementations remove support for site-local addresses. However, sacrificial servers for the zones C.E.F.IP6.ARPA through F.E.F.IP6.ARPA may still need to be deployed in the short term if the traffic becomes excessive.

For IPv6 Non-Locally Assigned Local addresses (L = 0) [RFC4193] (Hinden, R. and B. Haberman, “Unique Local IPv6 Unicast Addresses,” October 2005.), there has been no decision made about whether the Regional Internet Registries (RIRs) will provide delegations in this space or not. If they don't, then C.F.IP6.ARPA will need to be added to the list in Section 4.4 (IPv6 Locally Assigned Local Addresses). If they do, then registries will need to take steps to ensure that name servers are provided for these addresses.

IP6.INT was once used to provide reverse mapping for IPv6. IP6.INT was deprecated in [RFC4159] (Huston, G., “Deprecation of "ip6.int",” August 2005.) and the delegation removed from the INT zone in June 2006. While it is possible that legacy software continues to send queries for names under the IP6.INT domain, this document does not specify that IP6.INT be considered a local zone.

This document has also deliberately ignored names immediately under the root domain. While there is a subset of queries to the root name servers which could be addressed using the techniques described here (e.g. .local, .workgroup and IPv4 addresses), there is also a vast amount of traffic that requires a different strategy (e.g. lookups for unqualified hostnames, IPv6 addresses).



 TOC 

6.  IANA Considerations

This document requests that IANA establish a registry of zones which require this default behaviour. The initial contents of this registry are defined in Section 4 (Lists Of Zones Covered). Implementors are encouraged to periodically check this registry and adjust their implementations to reflect changes therein.

This registry can be amended through "IETF Review" as per [RFC5226] (Narten, T. and H. Alvestrand, “Guidelines for Writing an IANA Considerations Section in RFCs,” October 2008.).

IANA should co-ordinate with the RIRs to ensure that, as DNSSEC is deployed in the reverse tree, delegations for these zones are made in the manner described in Section 7 (Security Considerations).



 TOC 

7.  Security Considerations

During the initial deployment phase, particularly where [RFC1918] (Rekhter, Y., Moskowitz, B., Karrenberg, D., de Groot, G., and E. Lear, “Address Allocation for Private Internets,” February 1996.) addresses are in use, there may be some clients that unexpectedly receive a name error rather than a PTR record. This may cause some service disruption until their recursive name server(s) have been re-configured.

As DNSSEC is deployed within the IN-ADDR.ARPA and IP6.ARPA namespaces, the zones listed above will need to be delegated as insecure delegations, or be within insecure zones. This will allow DNSSEC validation to succeed for queries in these spaces despite not being answered from the delegated servers.

It is recommended that sites actively using these namespaces secure them using DNSSEC [RFC4035] (Arends, R., Austein, R., Larson, M., Massey, D., and S. Rose, “Protocol Modifications for the DNS Security Extensions,” March 2005.) by publishing and using DNSSEC trust anchors. This will protect the clients from accidental import of unsigned responses from the Internet.



 TOC 

8.  Acknowledgements

This work was supported by the US National Science Foundation (research grant SCI-0427144) and DNS-OARC.



 TOC 

9.  References



 TOC 

9.1. Normative References

[RFC1034] Mockapetris, P., “DOMAIN NAMES - CONCEPTS AND FACILITIES,” STD 13, RFC 1034, November 1987.
[RFC1035] Mockapetris, P., “DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION,” STD 13, RFC 1035, November 1987.
[RFC1918] Rekhter, Y., Moskowitz, B., Karrenberg, D., de Groot, G., and E. Lear, “Address Allocation for Private Internets,” BCP 5, RFC 1918, February 1996.
[RFC2119] Bradner, S., “Key words for use in RFCs to Indicate Requirement Levels,” BCP 14, RFC 2119, March 1997.
[RFC2136] Vixie, P., Thomson, A., Rekhter, Y., and J. Bound, “Dynamic Updates in the Domain Name System (DNS UPDATE),” RFC 2136, April 1997.
[RFC2308] Andrews, M., “Negative Caching of DNS Queries (DNS NCACHE),” RFC 2308, March 1998.
[RFC2606] Eastlake, D. and A. Panitz, “Reserved Top Level DNS Names,” BCP 32, RFC 2606, June 1999.
[RFC3596] Thomson, S., Huitema, C., Ksinant, V., and M. Souissi, “DNS Extensions to Support IPv6,” RFC 3596, October 2003.
[RFC4035] Arends, R., Austein, R., Larson, M., Massey, D., and S. Rose, “Protocol Modifications for the DNS Security Extensions,” RFC 4035, March 2005.
[RFC4159] Huston, G., “Deprecation of "ip6.int",” BCP 109, RFC 4159, August 2005.
[RFC4193] Hinden, R. and B. Haberman, “Unique Local IPv6 Unicast Addresses,” RFC 4193, October 2005.
[RFC4291] Hinden, R. and S. Deering, “IP Version 6 Addressing Architecture,” RFC 4291, February 2006.
[RFC4843] Nikander, P., Laganier, J., and F. Dupont, “An IPv6 Prefix for Overlay Routable Cryptographic Hash Identifiers (ORCHID),” RFC 4843, April 2007.
[RFC5226] Narten, T. and H. Alvestrand, “Guidelines for Writing an IANA Considerations Section in RFCs,” BCP 26, RFC 5226, October 2008.


 TOC 

9.2. Informative References

[AS112] AS112 Project.”
[I-D.draft-ietf-dnsop-as112-ops] Abley, J. and W. Maton, “AS112 Nameserver Operations,” draft-ietf-dnsop-as112-ops-03 (work in progress), October 2009.
[I-D.draft-ietf-dnsop-as112-under-attack-help-help] Abley, J. and W. Maton, “I'm Being Attacked by PRISONER.IANA.ORG!,” draft-ietf-dnsop-as112-under-attack-help-help-03 (work in progress), October 2009.
[RFC3849] Huston, G., Lord, A., and P. Smith, “IPv6 Address Prefix Reserved for Documentation,” RFC 3849, July 2004.
[RFC5735] Cotton, M. and L. Vergoda, “Special-Use IPv4 Addresses,” RFC 5735, January 2010.
[RFC5737] Arkko, J., Cotton, M., and L. Vergoda, “IPv4 Address Blocks Reserved for Documentation,” RFC 5737, January 2010.


 TOC 

Appendix A.  Change History [To Be Removed on Publication]



 TOC 

A.1.  draft-ietf-dnsop-default-local-zones-13.txt

Inclusion of ORCHID prefix.

reference updates.



 TOC 

A.2.  draft-ietf-dnsop-default-local-zones-12.txt

Update IP6.INT's non inclusion rational.

Removed Appendix B, which requested BCP status, as it was redundant.



 TOC 

A.3.  draft-ietf-dnsop-default-local-zones-11.txt

Change RFC 3330 to RFC 5735



 TOC 

A.4.  draft-ietf-dnsop-default-local-zones-10.txt

added RFC 5737 zones



 TOC 

A.5.  draft-ietf-dnsop-default-local-zones-09.txt

refresh awaiting writeup



 TOC 

A.6.  draft-ietf-dnsop-default-local-zones-08.txt

editorial, reference updates



 TOC 

A.7.  draft-ietf-dnsop-default-local-zones-07.txt

none, expiry prevention



 TOC 

A.8.  draft-ietf-dnsop-default-local-zones-06.txt

add IPv6 example prefix



 TOC 

A.9.  draft-ietf-dnsop-default-local-zones-05.txt

none, expiry prevention



 TOC 

A.10.  draft-ietf-dnsop-default-local-zones-04.txt

Centrally Assigned Local addresses -> Non-Locally Assigned Local address



 TOC 

A.11.  draft-ietf-dnsop-default-local-zones-03.txt

expanded section 4 descriptions

Added references [RFC2136] (Vixie, P., Thomson, A., Rekhter, Y., and J. Bound, “Dynamic Updates in the Domain Name System (DNS UPDATE),” April 1997.), [RFC3596] (Thomson, S., Huitema, C., Ksinant, V., and M. Souissi, “DNS Extensions to Support IPv6,” October 2003.), [I‑D.draft‑ietf‑dnsop‑as112‑ops] (Abley, J. and W. Maton, “AS112 Nameserver Operations,” October 2009.) and [I‑D.draft‑ietf‑dnsop‑as112‑under‑attack‑help‑help] (Abley, J. and W. Maton, “I'm Being Attacked by PRISONER.IANA.ORG!,” October 2009.).

Revised language.



 TOC 

A.12.  draft-ietf-dnsop-default-local-zones-02.txt

RNAME now "nobody.invalid."

Revised language.



 TOC 

A.13.  draft-ietf-dnsop-default-local-zones-01.txt

Revised impact description.

Updated to reflect change in IP6.INT status.



 TOC 

A.14.  draft-ietf-dnsop-default-local-zones-00.txt

Adopted by DNSOP.

"Author's Note" re-titled "Zones that are Out-Of-Scope"

Add note that these zone are expected to seed the IANA registry.

Title changed.



 TOC 

A.15.  draft-andrews-full-service-resolvers-03.txt

Added "Proposed Status".



 TOC 

A.16.  draft-andrews-full-service-resolvers-02.txt

Added 0.IN-ADDR.ARPA.



 TOC 

Author's Address

  Mark P. Andrews
  Internet Systems Consortium
  950 Charter Street
  Redwood City, CA 94063
  US
Email:  marka@isc.org