Network Working Group X. Li
Internet-Draft C. Bao
Intended status: Informational CERNET Center/Tsinghua University
Expires: April 22, 2010 October 19, 2009
DNS46 for the IPv4/IPv6 Stateless Translator
draft-xli-behave-dns46-for-stateless-00
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Abstract
The stateless translator can support IPv6-initiated communications as
well as the IPv4 initiated communications for the IPv6 hosts using
IPv4-translatable addresses. The DNS support for the IPv6-initiated
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communication is defined in the DNS64 document. This document
defines the DNS46 function for the stateless translator.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Notational Conventions . . . . . . . . . . . . . . . . . . . . 4
3. DNS function for the IPv4/IPv6 Stateless Translator . . . . . . 4
3.1. DNS64 function for the IPv4/IPv6 Stateless Translator . . . 4
3.2. DNS46 function for the IPv4/IPv6 Stateless Translator . . . 4
3.2.1. Fix AAAA record . . . . . . . . . . . . . . . . . . . . 4
3.2.2. Varying AAAA record . . . . . . . . . . . . . . . . . . 5
4. Security Considerations . . . . . . . . . . . . . . . . . . . . 5
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 5
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 5
7.1. Normative References . . . . . . . . . . . . . . . . . . . 5
7.2. Informative References . . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6
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1. Introduction
The IPv4/IPv6 translation framework document
[I-D.ietf-behave-v6v4-framework] presents the 8 scenarios and
introduces the stateless and stateful operation modes of the IPv4/
IPv6 translators. The stateless translator can support the following
scenarios.
o Scenario 1: An IPv6 network to the IPv4 Internet.
o Scenario 2: The IPv4 Internet to an IPv6 network.
o Scenario 5: An IPv6 network to an IPv4 network.
o Scenario 6: An IPv4 network to an IPv6 network.
The stateful translator can support the following scenarios.
o Scenario 1: An IPv6 network to the IPv4 Internet.
o Scenario 3: The IPv6 Internet to an IPv4 network.
o Scenario 5: An IPv6 network to an IPv4 network.
DNS mechanism is one of the functions model for the IPv6/IPv4
transition [I-D.ietf-behave-v6v4-framework]. In general, there are
the DNS64 for providing the name/address resolving from IPv4 to IPv6
and the DNS46 for providing the name/address resolving from IPv6 to
IPv4. In addition, if the destination is "an IPvX network", it is
the authoritative DNS server with IPvX and IPvY entries in the zone
file, while if the destination is "the IPvY Internet", it performs
the function for synthesizing the IPvX records from the IPvY records
[RFC1035].
The DNS64 should support:
o Scenario 1: An IPv6 network to the IPv4 Internet (synthesizing).
o Scenario 3: The IPv6 Internet to an IPv4 network (authoritative).
o Scenario 5: An IPv6 network to an IPv4 network (authoritative).
The DNS46 should support:
o Scenario 2: The IPv4 Internet to an IPv6 network (authoritative).
o Scenario 6: An IPv4 network to an IPv6 network (authoritative).
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2. Notational Conventions
The key words MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD,
SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, when they appear in this
document, are to be interpreted as described in [RFC2119].
3. DNS function for the IPv4/IPv6 Stateless Translator
The stateless translator can support IPv6-initiated communications as
well as the IPv4 initiated communications for the IPv6 hosts using
IPv4-translatable addresses, which requires the DNS64 function, as
well as the DNS46 function [I-D.xli-behave-ivi].
o Scenario 1: An IPv6 network to the IPv4 Internet (DNS64,
synthesizing).
o Scenario 2: The IPv4 Internet to an IPv6 network (DNS46,
authoritative).
o Scenario 5: An IPv6 network to an IPv4 network (DNS64,
authoritative).
o Scenario 6: An IPv4 network to an IPv6 network (DNS46,
authoritative).
3.1. DNS64 function for the IPv4/IPv6 Stateless Translator
The DNS64 function is for Scenarios 1 and Scenario 3, which are also
used for the stateful translators. The DNS64 function is defined in
DNS64 document [I-D.ietf-behave-dns64].
3.2. DNS46 function for the IPv4/IPv6 Stateless Translator
This document defines the DNS46 function and it is the authoritative
DNS server with A and AAAA entries in the zone file.
3.2.1. Fix AAAA record
This is very similar to the authoritative DNS configuration of the
dual-stack hosts. The only difference is that in the dual-stack
case, the A record and AAAA record are independent, while in
stateless translation case, the hosts are IPv6 single stack using
IPv4-translatable addresses and the A record can be derived from the
AAAA record based on the algorithm and the PREFIX information
[I-D.ietf-behave-address-format].
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3.2.2. Varying AAAA record
If IPv6 host has a varying AAAA record (that is, it could change due
to the IPv6-only host changing its IPv6 address and registering its
new address via, for example, Dynamic DNS), then the dynamic DNS46
function is required. However, it is still the authoritative DNS.
The A record can be derived from the AAAA record based on the
algorithm and the PREFIX information
[I-D.ietf-behave-address-format].
4. Security Considerations
There are no security considerations in this document.
5. IANA Considerations
This memo adds no new IANA considerations.
Note to RFC Editor: This section will have served its purpose if it
correctly tells IANA that no new assignments or registries are
required, or if those assignments or registries are created during
the RFC publication process. From the author's perspective, it may
therefore be removed upon publication as an RFC at the RFC Editor's
discretion.
6. Acknowledgments
The authors would like to acknowledge the following contributors of
this document: Dan Wing and Kevin Yin.
7. References
7.1. Normative References
[I-D.ietf-behave-address-format]
Huitema, C., Bao, C., Bagnulo, M., Boucadair, M., and X.
Li, "IPv6 Addressing of IPv4/IPv6 Translators",
draft-ietf-behave-address-format-00 (work in progress),
August 2009.
[I-D.ietf-behave-dns64]
Bagnulo, M., Sullivan, A., Matthews, P., and I. Beijnum,
"DNS64: DNS extensions for Network Address Translation
from IPv6 Clients to IPv4 Servers",
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draft-ietf-behave-dns64-00 (work in progress), July 2009.
[I-D.ietf-behave-v6v4-framework]
Baker, F., Li, X., Bao, C., and K. Yin, "Framework for
IPv4/IPv6 Translation",
draft-ietf-behave-v6v4-framework-01 (work in progress),
September 2009.
[RFC1035] Mockapetris, P., "Domain names - implementation and
specification", STD 13, RFC 1035, November 1987.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
7.2. Informative References
[I-D.xli-behave-ivi]
Li, X., Bao, C., Chen, M., Zhang, H., and J. Wu, "The
CERNET IVI Translation Design and Deployment for the IPv4/
IPv6 Coexistence and Transition", draft-xli-behave-ivi-02
(work in progress), June 2009.
Authors' Addresses
Xing Li
CERNET Center/Tsinghua University
Room 225, Main Building, Tsinghua University
Beijing 100084
CN
Phone: +86 10-62785983
Email: xing@cernet.edu.cn
Congxiao Bao
CERNET Center/Tsinghua University
Room 225, Main Building, Tsinghua University
Beijing 100084
CN
Phone: +86 10-62785983
Email: congxiao@cernet.edu.cn
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