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Comparison of Different NAT Traversal Techniques for Media Controlled by the Real-Time Streaming Protocol (RTSP) (RFC7604) Disclosure Number: IPCOM000244952D
Original Publication Date: 2015-Sep-01
Included in the Prior Art Database: 2016-Feb-04

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

M. Westerlund: AUTHOR [+1]


Today there is a proliferating deployment of different types of Network Address Translator (NAT) boxes that in many cases only loosely follow standards [RFC3022] [RFC2663] [RFC3424] [RFC4787] [RFC5382]. NATs cause discontinuity in address realms [RFC3424]; therefore, an application protocol, such as the Real-Time Streaming Protocol (RTSP) [RFC2326] [RTSP], needs to deal with such discontinuities caused by NATs. The problem is that, being a media control protocol managing one or more media streams, RTSP carries network address and port information within its protocol messages. Because of this, even if RTSP itself, when carried over the Transmission Control Protocol (TCP) [RFC793], for example, is not blocked by NATs, its media streams may be blocked by NATs. This will occur unless special protocol provisions are added to support NAT traversal.

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Internet Engineering Task Force (IETF)                     M. Westerlund Request for Comments: 7604                                      Ericsson Category: Informational                                          T. Zeng ISSN: 2070-1721                                         PacketVideo Corp                                                           September 2015

             Comparison of Different NAT Traversal Techniques     for Media Controlled by the Real-Time Streaming Protocol (RTSP)


   This document describes several Network Address Translator (NAT)    traversal techniques that were considered to be used for establishing    the RTP media flows controlled by the Real-Time Streaming Protocol    (RTSP).  Each technique includes a description of how it would be    used, the security implications of using it, and any other deployment    considerations it has.  There are also discussions on how NAT    traversal techniques relate to firewalls and how each technique can    be applied in different use cases.  These findings were used when    selecting the NAT traversal for RTSP 2.0, which is specified in a    separate document.

Status of This Memo

   This document is not an Internet Standards Track specification; it is    published for informational purposes.

   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).  Not all documents    approved by the IESG are 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

Westerlund & Zeng             Informational                     [Page 1]
 RFC 7604          Evaluation of NAT Traversal for RTSP    September 2015

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