Internet Engineering Task Force (IETF) S. Nandakumar
Request for Comments: 7064 G. Salgueiro
Category: Standards Track P. Jones
ISSN: 2070-1721 Cisco Systems
M. Petit-Huguenin
Impedance Mismatch
November 2013
URI Scheme for the Session Traversal Utilities for NAT (STUN) Protocol
Abstract
This document specifies the syntax and semantics of the Uniform
Resource Identifier (URI) scheme for the Session Traversal Utilities
for NAT (STUN) protocol.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in 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/rfc7064.
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Nandakumar, et al. Standards Track [Page 1]RFC 7064 STUN URI November 2013Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Definition of the "stun" or "stuns" URI . . . . . . . . . . . 3
3.1. URI Scheme Syntax . . . . . . . . . . . . . . . . . . . . 3
3.2. URI Scheme Semantics . . . . . . . . . . . . . . . . . . 4
4. Security Considerations . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
5.1. "stun" URI Registration . . . . . . . . . . . . . . . . . 5
5.2. "stuns" URI Registration . . . . . . . . . . . . . . . . 6
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 6
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.1. Normative References . . . . . . . . . . . . . . . . . . 7
7.2. Informative References . . . . . . . . . . . . . . . . . 7
Appendix A. Examples . . . . . . . . . . . . . . . . . . . . . . 8
Appendix B. Design Notes . . . . . . . . . . . . . . . . . . . . 8
Nandakumar, et al. Standards Track [Page 2]RFC 7064 STUN URI November 20131. Introduction
This document specifies the syntax and semantics of the Uniform
Resource Identifier (URI) scheme for the Session Traversal Utilities
for NAT (STUN) protocol.
STUN is a protocol that serves as a tool for other protocols in
dealing with Network Address Translator (NAT) traversal. It can be
used by an endpoint to determine the IP address and port allocated to
it by a NAT, to perform connectivity checks between two endpoints,
and as a keepalive protocol to maintain NAT bindings. RFC 5389
[RFC5389] defines the specifics of the STUN protocol.
The "stun" and "stuns" URI schemes are used to designate a stand-
alone STUN server or any Internet host performing the operations of a
STUN server in the context of STUN usages (Section 14 of RFC 5389
[RFC5389]). With the advent of standards such as WebRTC [WEBRTC], we
anticipate a plethora of endpoints and web applications to be able to
identify and communicate with such a STUN server to carry out the
STUN protocol. This implies that endpoints and/or applications must
be provisioned with the appropriate configuration to identify the
STUN server. Having an inconsistent syntax adds ambiguity and can
result in non-interoperable solutions and implementation limitations.
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