Comparison of Different NAT Traversal Techniques for Media Controlled by the Real-Time Streaming Protocol (RTSP) (RFC7604)
Original Publication Date: 2015-Sep-01
Included in the Prior Art Database: 2016-Feb-04
Internet Society Requests For Comment (RFCs)
M. Westerlund: AUTHOR [+2]
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.
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 http://www.rfc-editor.org/info/rfc7604.
Zeng Informational [Page 1]
RFC 7604 Evaluation of NAT Traversal for RTSP September 2015
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