A TCP Authentication Option Extension for NAT Traversal
RFC 6978
| Document | Type |
RFC - Experimental
(July 2013; No errata)
Was draft-touch-tcp-ao-nat (individual)
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | ISE | ||
| Formats | plain text pdf html bibtex | ||
| IETF conflict review | conflict-review-touch-tcp-ao-nat | ||
| Stream | ISE state | Published RFC | |
| Consensus Boilerplate | Unknown | ||
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 6978 (Experimental) | |
| Telechat date | |||
| Responsible AD | (None) | ||
| Send notices to | rfc-ise@rfc-editor.org | ||
Independent Submission J. Touch
Request for Comments: 6978 USC/ISI
Category: Experimental July 2013
ISSN: 2070-1721
A TCP Authentication Option Extension for NAT Traversal
Abstract
This document describes an extension to the TCP Authentication Option
(TCP-AO) to support its use over connections that pass through
Network Address Translators and/or Network Address and Port
Translators (NATs/NAPTs). This extension changes the data used to
compute traffic keys, but it does not alter TCP-AO's packet
processing or key generation algorithms.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for examination, experimental implementation, and
evaluation.
This document defines an Experimental Protocol for the Internet
community. 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/rfc6978.
Copyright Notice
Copyright (c) 2013 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.
Touch Experimental [Page 1]
RFC 6978 TCP-AO NAT Extension July 2013
Table of Contents
1. Introduction ....................................................2
2. Conventions Used in This Document ...............................2
3. Background ......................................................3
4. Extension to Allow NAT Traversal ................................3
5. Intended Use ....................................................4
6. Security Considerations .........................................5
7. References ......................................................5
7.1. Normative References .......................................5
7.2. Informative References .....................................5
8. Acknowledgments .................................................6
1. Introduction
This document describes an extension to the TCP Authentication Option
(TCP-AO) [RFC5925] called TCP-AO-NAT to support its use in the
presence of Network Address Translators and/or Network Address and
Port Translators (NATs/NAPTs) [RFC2663]. These devices translate the
source address and/or the source port number of a TCP connection.
TCP-AO without TCP-AO-NAT extensions would be sensitive to these
modifications and would discard authenticated segments.
At least one potential application of TCP-AO-NAT is to support the
experimental multipath TCP protocol [RFC6824], which uses multiple IP
addresses to support a single TCP transfer.
This document assumes detailed familiarity with TCP-AO [RFC5925]. As
a preview, this document focuses on how TCP-AO generates traffic
keys, and it does not otherwise alter the TCP-AO mechanism or that of
its key generation [RFC5926].
2. Conventions Used in This Document
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 RFC 2119 [RFC2119].
When used in lower case, these words have their conventional meaning
and do not convey the interpretations in RFC 2119.
Touch Experimental [Page 2]
RFC 6978 TCP-AO NAT Extension July 2013
3. Background
TCP-AO generates traffic keys that are specific to a socket pair
[RFC5925]. The following information is used to create a
connection's traffic keys. (Note that 'local' and 'remote' are
interpreted as in TCP-AO [RFC5925].)
o IP local address
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