Internet DRAFT - draft-andrews-6man-dns64-exclude
draft-andrews-6man-dns64-exclude
Network Working Group M. Andrews
Internet-Draft ISC
Intended status: Standards Track July 22, 2019
Expires: January 23, 2020
DNS64 Exclusion List RA Option
draft-andrews-6man-dns64-exclude-00
Abstract
To allow automatic device configuration to a DNS64 process behind a
IPv6-only link it is necessary to provide AAAA and A record exclusion
lists. This document provide such a mechanism.
Status of This Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Reserved Words . . . . . . . . . . . . . . . . . . . . . 2
2. DNS64-EXCLUDE Option . . . . . . . . . . . . . . . . . . . . 2
3. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
5. Security Considerations . . . . . . . . . . . . . . . . . . . 3
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
6.1. Normative References . . . . . . . . . . . . . . . . . . 4
6.2. Informative References . . . . . . . . . . . . . . . . . 4
6.3. URIs . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 4
1. Introduction
To allow automatic device configuration to a DNS64 process behind a
IPv6-only link it is necessary to provide AAAA and A record exclusion
lists. This document provide such a mechanism.
When an DNS64 implementation needs to be configured behind DNS64
server, for example when performing DNSSEC [RFC4034] validation, the
AAAA exclusion list from [RFC6147] needs to be made available. When
the DNS64 implementation implementation is also on a local dual-stack
network the local A records also need to be excluded from DNS64
processing to prevent local traffic being sent to the NAT64.
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].
2. DNS64-EXCLUDE Option
The DNS64-EXLUDE option (TBA) contains a DNS wire encoded name
[RFC1034] which points at 1 or 2 APL records [RFC3123] where the
records contain IPv4 and IPv6 exclusions lists which are encoded on a
first match basis. If there are multiple records prefixes for a
address family MUST NOT be split across multiple records as DNS
records are not ordered.
The IPv6 prefixes are used to populate the AAAA exclusion list from
[RFC6147] Section 5.1.4.
The IPv4 prefixes are used to exclude A records from translation to
DNS64 mapped AAAA records.
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Lifetime |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ DNS Wire Encoded Name ~
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| | Padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3. Examples
dns64.example.com. IN APL !1:10.0.0/24 1:10/8 2:64:ff9b::/32
Single Record
dns64.example.com. IN APL !1:10.0.0/24 1:10/8
dns64.example.com. IN APL 2:64:ff9b::/32
Multiple Records
Exclude 10.0.0.0/8 except for 10.0.0.0/24 from DNS64 processing.
Exclude the well known DNS64 prefix 64:ff9b::/32 from DNS64
processing.
4. IANA Considerations
The IANA is requested to assign a new IPv6 Neighbor Discovery Option
type for the DNS64-EXCLUDE option defined in this document.
+----------------------+-------+
| Option Name | Type |
+----------------------+-------+
| DNS64-EXCLUDE option | (TBD) |
+----------------------+-------+
The IANA registry for these options is:
https://www.iana.org/assignments/icmpv6-parameters [1]
5. Security Considerations
TBA
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6. References
6.1. Normative References
[RFC1034] Mockapetris, P., "Domain names - concepts and facilities",
STD 13, RFC 1034, DOI 10.17487/RFC1034, November 1987,
<https://www.rfc-editor.org/info/rfc1034>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC3123] Koch, P., "A DNS RR Type for Lists of Address Prefixes
(APL RR)", RFC 3123, DOI 10.17487/RFC3123, June 2001,
<https://www.rfc-editor.org/info/rfc3123>.
6.2. Informative References
[RFC4034] Arends, R., Austein, R., Larson, M., Massey, D., and S.
Rose, "Resource Records for the DNS Security Extensions",
RFC 4034, DOI 10.17487/RFC4034, March 2005,
<https://www.rfc-editor.org/info/rfc4034>.
[RFC6147] Bagnulo, M., Sullivan, A., Matthews, P., and I. van
Beijnum, "DNS64: DNS Extensions for Network Address
Translation from IPv6 Clients to IPv4 Servers", RFC 6147,
DOI 10.17487/RFC6147, April 2011,
<https://www.rfc-editor.org/info/rfc6147>.
6.3. URIs
[1] https://www.iana.org/assignments/icmpv6-parameters
Author's Address
M. Andrews
Internet Systems Consortium
950 Charter Street
Redwood City, CA 94063
US
Email: marka@isc.org
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