Transmission of IPv4 Packets over Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) Interfaces
RFC 5579
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RFC - Informational
(February 2010; No errata)
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2015-10-14
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ISE
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plain text
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(None)
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Unknown
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IESG state |
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RFC 5579 (Informational)
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Responsible AD |
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Jari Arkko
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rfc-editor@rfc-editor.org
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Independent Submission F. Templin, Ed.
Request for Comments: 5579 Boeing Research & Technology
Category: Informational February 2010
ISSN: 2070-1721
Transmission of IPv4 Packets over
Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) Interfaces
Abstract
The Intra-Site Automatic Tunnel Addressing Protocol (ISATAP)
specifies a Non-Broadcast, Multiple Access (NBMA) interface type for
the transmission of IPv6 packets over IPv4 networks using automatic
IPv6-in-IPv4 encapsulation. The original specifications make no
provisions for the encapsulation and transmission of IPv4 packets,
however. This document specifies a method for transmitting IPv4
packets over ISATAP interfaces.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This is a contribution to the RFC Series, independently of any other
RFC stream. The RFC Editor has chosen to publish this document at
its discretion and makes no statement about its value for
implementation or deployment. Documents approved for publication by
the RFC Editor are not a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc5579.
IESG Note
This RFC is not a candidate for any level of Internet Standard. The
IETF disclaims any knowledge of the fitness of this RFC for any
purpose and in particular notes that the decision to publish is not
based on IETF review for such things as security, congestion control,
or inappropriate interaction with deployed protocols. The RFC Editor
has chosen to publish this document at its discretion. Readers of
this document should exercise caution in evaluating its value for
implementation and deployment. See RFC 3932 for more information.
Templin Informational [Page 1]
RFC 5579 IPv4 Packets over ISATAP February 2010
Copyright Notice
Copyright (c) 2010 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document.
Table of Contents
1. Introduction ....................................................3
2. Terminology .....................................................3
3. ISATAP Interface Model ..........................................3
4. ISATAP Interface MTU ............................................4
5. IPv6 Operation ..................................................4
6. IPv4 Operation ..................................................4
6.1. ISATAP IPv4 Address Configuration ..........................4
6.2. IPv4 Route Configuration ...................................5
6.3. ISATAP Interface Determination .............................5
6.4. Next-Hop Resolution ........................................5
6.5. Encapsulation and Transmission .............................6
6.6. IPv4 Multicast Mapping .....................................6
6.7. Recursive Encapsulation Avoidance ..........................7
7. Security Considerations .........................................7
8. Acknowledgements ................................................7
9. References ......................................................7
9.1. Normative References .......................................7
9.2. Informative References .....................................8
Appendix A. Encapsulation Avoidance ................................9
Templin Informational [Page 2]
RFC 5579 IPv4 Packets over ISATAP February 2010
1. Introduction
The Intra-Site Automatic Tunnel Addressing Protocol (ISATAP)
[RFC5214] specifies a Non-Broadcast, Multiple Access (NBMA) interface
type for the transmission of IPv6 packets over IPv4 networks using
automatic IPv6-in-IPv4 encapsulation. ISATAP interfaces therefore
typically configure IPv6 addresses and prefixes, but they do not
configure IPv4 addresses and prefixes. In typical implementations
and deployments, an ISATAP interface therefore appears as an ordinary
interface configured for IPv6 operation but with a null IPv4
configuration. This places an unnecessary limitation on the ISATAP
domain of applicability.
ISATAP interfaces perform automatic IPv6-in-IPv4 encapsulation over a
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