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Versions: (draft-koch-mboned-mcast-arpa) 00
01 02 03
Network Working Group P. Koch
Internet-Draft DENIC eG
Intended status: BCP L. Vegoda
Expires: December 16, 2010 ICANN
June 14, 2010
Moving MCAST.NET into the ARPA infrastructure top level domain
draft-ietf-mboned-mcast-arpa-02
Abstract
This document proposes to migrate the MCAST.NET domain into the ARPA
top level domain that is dedicated to infrastructure support. It
also provides for a maintenance policy for the new MCAST.ARPA domain
and covers migration issues and caveats. This document updates RFC
5771 and forms part of BCP 51.
XXX reverse mapping
Status of this Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . 3
3. The ARPA top level domain . . . . . . . . . . . . . . . 3
4. Current Use . . . . . . . . . . . . . . . . . . . . . . 3
5. Registration Policy . . . . . . . . . . . . . . . . . . 3
5.1. Names and Addresses eligible for Registration in
MCAST.ARPA . . . . . . . . . . . . . . . . . . . . . . 4
5.2. Subdomains of MCAST.ARPA . . . . . . . . . . . . . . . 4
5.3. Corresponding Reverse Mapping . . . . . . . . . . . . . 4
5.3.1. Reverse Mapping for 224/4 . . . . . . . . . . . . . . . 4
5.3.2. Reverse Mapping for FF0::/12 . . . . . . . . . . . . . 4
6. Migration Issues . . . . . . . . . . . . . . . . . . . 4
6.1. Migration Strategies . . . . . . . . . . . . . . . . . 5
6.1.1. Freeze . . . . . . . . . . . . . . . . . . . . . . . . 5
6.1.2. Phase Out . . . . . . . . . . . . . . . . . . . . . . . 5
6.1.3. Continue . . . . . . . . . . . . . . . . . . . . . . . 5
7. Security Considerations . . . . . . . . . . . . . . . . 5
8. IANA Considerations . . . . . . . . . . . . . . . . . . 6
9. Acknowledgements . . . . . . . . . . . . . . . . . . . 6
10. References . . . . . . . . . . . . . . . . . . . . . . 6
10.1. Normative References . . . . . . . . . . . . . . . . . 6
10.2. Informative References . . . . . . . . . . . . . . . . 7
Appendix A. Document Revision History . . . . . . . . . . . . . . . 7
A.1. Changes from -01 to -02 . . . . . . . . . . . . . . . . 7
A.2. Changes from -00 to -01 . . . . . . . . . . . . . . . . 7
A.3. Initial Document . . . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . 8
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1. Introduction
This document describes a maintenance policy and migration strategy
for the MCAST.NET (MCAST.ARPA) domain that contains names for a
subset of the multicast groups assigned by the IANA.
2. Terminology
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 BCP 14, [RFC2119].
3. The ARPA top level domain
[RFC3172] designates the ARPA top level domain as "Address and
Routing Parameters Area" to be used for infrastructure applications.
The MCAST.NET second level domain fulfills the criteria set out in
section 2.1 of [RFC3172]. However, there is no standards track
document explicitly designating this domain to a multicast group name
to multicast group address mapping.
[RFC5771] defines the IPv4 multicast address assignment policy.
[RFC4291] defines the IPv6 multicast address assignment policy.
4. Current Use
Currently the zone MCAST.NET reflects the contents of parts the IANA
IPv4 multicast address registry. However, some names are missing
from the DNS zone and some names used differ from the description
that appears in the registry file. Entries in the IPv6 multicast
address registry are not reflected in the MCAST.NET zone.
With few exceptions, only multicast group addresses from 224.0.0/24
and 224.0.1/24 are listed in MCAST.NET. Addresses outside 224/8 do
not appear at all.
5. Registration Policy
Names within MCAST.ARPA will consist of one additional label and MUST
adhere to the hostname syntax requirements of [RFC1123]. These names
MUST own a single A RR, a single AAAA RR, or both. Addresses will be
in the IPv4 or IPv6 multicast address space.
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5.1. Names and Addresses eligible for Registration in MCAST.ARPA
Only IANA multicast address registrations are eligible for being
listed in MCAST.ARPA.
For IPv4, only multicast groups from 224.0.0/24 (Local Network
Control Block) and 224.0.1/24 (Internetwork Control Block) will have
names assigned.
For IPv6, only multicast groups from FF01::/16 (Node-Local Scope
Multicast Addresses) and FF02::/16 (Link-Local Scope Multicast
Addresses) will have names assigned.
5.2. Subdomains of MCAST.ARPA
The namespace under MCAST.ARPA is considered flat, i.e., all direct
descendants of MCAST.ARPA are leaves in the DNS tree. Future
extensions might want to define subdomains that serve special
purposes. Any such designation needs IETF consensus [RFC5226].
5.3. Corresponding Reverse Mapping
The DNS Reverse Mapping for those multicast groups that appear as
addresses in MCAST.ARPA MUST be kept consistent with the forward
namespace.
5.3.1. Reverse Mapping for 224/4
A single DNS PTR record will be entered at the corresponding owner
within the 224.IN-ADDR.ARPA domain that points to the multicast group
name within MCAST.ARPA.
The zones 225.IN-ADDR.ARPA through 239.IN-ADDR.ARPA will be delegated
but MUST remain empty (except necessary infrastructure RRs). The one
exception is 233.IN-ADDR.ARPA. A mechanism for the delegation of
reverse mapping for GLOP space [RFC3180] should be designed and
implemented.
5.3.2. Reverse Mapping for FF0::/12
[How to deal with IPv6 multicast reverse mapping is TBD.]
6. Migration Issues
The current content of the MCAST.NET zone MUST be brought in line
with the multicast address registry.
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Since legacy systems may use MCAST.NET for quite some time, there
needs to be a mapping/forwarding solution to answer those queries in
a useful manner without discouraging migration.
RFCs mentioning MCAST.NET are [RFC3261] and [RFC3678].
An updated multicast address architecture appears in
[I-D.ietf-mboned-addrarch].
6.1. Migration Strategies
After the move, several options are available for the future handling
of MCAST.NET.
[[The working group needs to choose one of the options.]]
6.1.1. Freeze
The current MCAST.NET zone could be frozen, so that no additions,
deletions or changes to the content (apart from those necessary for
maintenance, e.g. SOA and NS RRs) would be performed. New
registrations would only be available in MCAST.ARPA, so this could be
an incentive for querying clients to alter their behavior as well.
6.1.2. Phase Out
MCAST.NET would only see deletions. Even after the last record will
have been deleted, the domain should be kept registered by the IANA
to prevent redelegation ...
6.1.3. Continue
MCAST.NET could be further operated in parallel, either by
operational habit or per DNAME RR, as described in [RFC2672].
7. Security Considerations
The usual Security Considerations for the DNS [RFC3833]apply.
The MCAST.ARPA., MCAST.NET., and the Reverse mapping zones mentioned
in this document SHALL be DNSSEC signed by the IANA under direction
from the IAB.
There is no Security Problem associated with the migration itself.
XXX keeping MCAST.NET.
{This section needs more work.}
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8. IANA Considerations
This document amends [RFC5771] to add a mandatory entry in the
MCAST.ARPA domain and a corresponding reverse mapping entry. The
officially registered multicast group name is made subject to DNS
hostname syntax rules.
9. Acknowledgements
The authors would like to thank David Conrad and Joe Abley for their
input.
10. References
10.1. 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.
[RFC1123] Braden, R., "Requirements for Internet Hosts - Application
and Support", STD 3, RFC 1123, October 1989.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3172] Huston, G., "Management Guidelines & Operational
Requirements for the Address and Routing Parameter Area
Domain ("arpa")", BCP 52, RFC 3172, September 2001.
[RFC3180] Meyer, D. and P. Lothberg, "GLOP Addressing in 233/8",
BCP 53, RFC 3180, September 2001.
[RFC4291] Hinden, R. and S. Deering, "IP Version 6 Addressing
Architecture", RFC 4291, February 2006.
[RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 5226,
May 2008.
[RFC5771] Cotton, M., Vegoda, L., and D. Meyer, "IANA Guidelines for
IPv4 Multicast Address Assignments", BCP 51, RFC 5771,
March 2010.
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10.2. Informative References
[I-D.ietf-mboned-addrarch]
Savola, P., "Overview of the Internet Multicast Addressing
Architecture", draft-ietf-mboned-addrarch-06 (work in
progress), August 2009.
[RFC2672] Crawford, M., "Non-Terminal DNS Name Redirection",
RFC 2672, August 1999.
[RFC2908] Thaler, D., Handley, M., and D. Estrin, "The Internet
Multicast Address Allocation Architecture", RFC 2908,
September 2000.
[RFC3261] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston,
A., Peterson, J., Sparks, R., Handley, M., and E.
Schooler, "SIP: Session Initiation Protocol", RFC 3261,
June 2002.
[RFC3678] Thaler, D., Fenner, B., and B. Quinn, "Socket Interface
Extensions for Multicast Source Filters", RFC 3678,
January 2004.
[RFC3833] Atkins, D. and R. Austein, "Threat Analysis of the Domain
Name System (DNS)", RFC 3833, August 2004.
Appendix A. Document Revision History
This section is to be removed should the draft be published.
A.1. Changes from -01 to -02
Added text about v6 multicast.
Added text about GLOP space
Added terminology section and RFC 2119 language
A.2. Changes from -00 to -01
Added text about DNS reverse mapping. Eligibility for an MCAST.ARPA
name now restricted to 224.0.0/24 and 224.0.1/24. Stronger
requirement for MCAST.ARPA subdomains.
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A.3. Initial Document
First draft, taking over with only little changes from
draft-koch-mboned-mcast-arpa-00.txt
Authors' Addresses
Peter Koch
DENIC eG
Kaiserstrasse 75-77
Frankfurt 60329
DE
Phone: +49 69 27235 0
Email: pk@DENIC.DE
Leo Vegoda
Internet Corporation for Assigned Names and Numbers
4676 Admiralty Way, Suite 330
Marina del Rey 90292
United States of America
Phone: +1-310-823-9358
Email: leo.vegoda@icann.org
URI: http://www.iana.org/
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