The RFC Archive
 The RFC Archive   RFC 4961   « Jump to any RFC number directly 
 RFC Home
Full RFC Index
Recent RFCs
RFC Standards
Best Current Practice
RFC Errata
1 April RFC



IETF RFC 4961

Symmetric RTP / RTP Control Protocol (RTCP)

Last modified on Tuesday, July 31st, 2007

Permanent link to RFC 4961
Search GitHub Wiki for RFC 4961
Show other RFCs mentioning RFC 4961







Network Working Group                                            D. Wing
Request for Comments:  4961                                Cisco Systems
BCP:  131                                                      July 2007
Category: Best Current Practice 


              Symmetric RTP / RTP Control Protocol (RTCP)

 Status of This Memo

   This document specifies an Internet Best Current Practices for the
   Internet Community, and requests discussion and suggestions for
   improvements.  Distribution of this memo is unlimited.

 Copyright Notice

   Copyright © The IETF Trust (2007).

 Abstract

   This document recommends using one UDP port pair for both
   communication directions of bidirectional RTP and RTP Control
   Protocol (RTCP) sessions, commonly called "symmetric RTP" and
   "symmetric RTCP".

 Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 2
   2.  Conventions Used in this Document . . . . . . . . . . . . . . . 2
   3.  Definition of Symmetric RTP and Symmetric RTCP  . . . . . . . . 3
   4.  Recommended Usage . . . . . . . . . . . . . . . . . . . . . . . 3
   5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 4
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     7.1.  Normative References  . . . . . . . . . . . . . . . . . . . 4
     7.2.  Informative References  . . . . . . . . . . . . . . . . . . 4















Wing                     Best Current Practice               PAGE 1 top


RFC 4961 Symmetric RTP and RTCP July 2007 1. Introduction TCP [RFC 793], which is inherently bidirectional, transmits and receives data using the same local port. That is, when a TCP connection is established from host A with source TCP port "a" to a remote host, the remote host sends packets back to host A's source TCP port "a". However, UDP is not inherently bidirectional and UDP does not require using the same port for sending and receiving bidirectional traffic. Rather, some UDP applications use a single UDP port to transmit and receive (e.g., DNS [RFC 1035]), some applications use different UDP ports to transmit and receive with explicit signaling (e.g., Trivial File Transfer Protocol (TFTP) [RFC 1350]), and other applications don't specify the choice of transmit and receive ports (RTP [RFC 3550]). Because RTP and RTCP are not inherently bidirectional protocols, and UDP is not a bidirectional protocol, the usefulness of using the same UDP port for transmitting and receiving has been generally ignored for RTP and RTCP. Many firewalls, Network Address Translators (NATs) [RFC 3022], and RTP implementations expect symmetric RTP, and do not work in the presence of asymmetric RTP. However, this term has never been defined. This document defines "symmetric RTP" and "symmetric RTCP". The UDP port number to receive media, and the UDP port to transmit media are both selected by the device that receives that media and transmits that media. For unicast flows, the receive port is communicated to the remote peer (e.g., Session Description Protocol (SDP) [RFC 4566] carried in SIP [RFC 3261], Session Announcement Protocol (SAP) [RFC 2974], or Megaco/H.248 [RFC 3525]). There is no correspondence between the local RTP (or RTCP) port and the remote RTP (or RTCP) port. That is, device "A" might choose its local transmit and receive port to be 1234. Its peer, device "B", is not constrained to also use port 1234 for its port. In fact, such a constraint is impossible to meet because device "B" might already be using that port for another application. The benefits of using one UDP port pair is described below in Section 4. 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]. Wing Best Current Practice PAGE 2 top

RFC 4961 Symmetric RTP and RTCP July 2007 3. Definition of Symmetric RTP and Symmetric RTCP A device supports symmetric RTP if it selects, communicates, and uses IP addresses and port numbers such that, when receiving a bidirectional RTP media stream on UDP port "A" and IP address "a", it also transmits RTP media for that stream from the same source UDP port "A" and IP address "a". That is, it uses the same UDP port to transmit and receive one RTP stream. A device that doesn't support symmetric RTP would transmit RTP from a different port, or from a different IP address, than the port and IP address used to receive RTP for that bidirectional media steam. A device supports symmetric RTCP if it selects, communicates, and uses IP addresses and port numbers such that, when receiving RTCP packets for a media stream on UDP port "B" and IP address "b", it also transmits RTCP packets for that stream from the same source UDP port "B" and IP address "b". That is, it uses the same UDP port to transmit and receive one RTCP stream. A device that doesn't support symmetric RTCP would transmit RTCP from a different port, or from a different IP address, than the port and IP address used to receive RTCP. 4. Recommended Usage There are two specific instances where symmetric RTP and symmetric RTCP are REQUIRED: The first instance is NATs that lack integrated Application Layer Gateway (ALG) functionality. Such NATs require that endpoints use symmetric UDP ports to establish bidirectional traffic. This requirement exists for all types of NATs described in Section 4 of [RFC 4787]. ALGs are defined in Section 4.4 of [RFC 3022]. The second instance is Session Border Controllers (SBCs) and other forms of RTP and RTCP relays (e.g., [TURN]). Media relays are necessary to establish bidirectional UDP communication across a NAT that is 'Address-Dependent' or 'Address and Port-Dependent' [RFC 4787]. However, even with a media relay, symmetric UDP ports are still required to traverse such a NAT. There are other instances where symmetric RTP and symmetric RTCP are helpful, but not required. For example, if a firewall can expect symmetric RTP and symmetric RTCP, then the firewall's dynamic per- call port filter list can be more restrictive compared to asymmetric RTP and asymmetric RTCP. Symmetric RTP and symmetric RTCP can also ease debugging and troubleshooting. Wing Best Current Practice PAGE 3 top

RFC 4961 Symmetric RTP and RTCP July 2007 Other UDP-based protocols can also benefit from common local transmit and receive ports. There are no known cases where symmetric RTP or symmetric RTCP are harmful. For these reasons, it is RECOMMENDED that symmetric RTP and symmetric RTCP always be used for bidirectional RTP media streams. 5. Security Considerations If an attacker learns the source and destination UDP ports of a symmetric RTP or symmetric RTCP flow, the attacker can send RTP or RTCP packets to that host. This differs from asymmetric RTP and asymmetric RTCP, where an attacker has to learn the UDP source and destination ports used for the reverse traffic, before it can send packets to that host. Thus, if a host uses symmetric RTP or symmetric RTCP, an attacker need only see one RTP or RTCP packet in order to attack either RTP endpoint. Note that this attack is similar to that of other UDP-based protocols that use one UDP port pair (e.g., DNS [RFC 1035]). 6. Acknowledgments The author thanks Francois Audet, Sunil Bhargo, Lars Eggert, Francois Le Faucheur, Cullen Jennings, Benny Rodrig, Robert Sparks, and Joe Stone for their assistance with this document. 7. References 7.1. Normative References [RFC 2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. 7.2. Informative References [RFC 3550] Schulzrinne, H., Casner, S., Frederick, R., and V. Jacobson, "RTP: A Transport Protocol for Real-Time Applications", STD 64, RFC 3550, July 2003. [RFC 4787] Audet, F. and C. Jennings, "Network Address Translation (NAT) Behavioral Requirements for Unicast UDP", BCP 127, RFC 4787, January 2007. [RFC 793] Postel, J., "Transmission Control Protocol", STD 7, RFC 793, September 1981. Wing Best Current Practice PAGE 4 top

RFC 4961 Symmetric RTP and RTCP July 2007 [RFC 3022] Srisuresh, P. and K. Egevang, "Traditional IP Network Address Translator (Traditional NAT)", RFC 3022, January 2001. [RFC 4566] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session Description Protocol", RFC 4566, July 2006. [RFC 1035] Mockapetris, P., "Domain names - implementation and specification", STD 13, RFC 1035, November 1987. [RFC 1350] Sollins, K., "The TFTP Protocol (Revision 2)", STD 33, RFC 1350, July 1992. [TURN] Rosenberg, J., "Obtaining Relay Addresses from Simple Traversal Underneath NAT (STUN)", Work in Progress, July 2007. [RFC 3261] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A., Peterson, J., Sparks, R., Handley, M., and E. Schooler, "SIP: Session Initiation Protocol", RFC 3261, June 2002. [RFC 2974] Handley, M., Perkins, C., and E. Whelan, "Session Announcement Protocol", RFC 2974, October 2000. [RFC 3525] Groves, C., Pantaleo, M., Anderson, T., and T. Taylor, "Gateway Control Protocol Version 1", RFC 3525, June 2003. Author's Address Dan Wing Cisco Systems 170 West Tasman Drive San Jose, CA 95134 USA EMail: dwing@cisco.com Wing Best Current Practice PAGE 5 top

RFC 4961 Symmetric RTP and RTCP July 2007 Full Copyright Statement Copyright © The IETF Trust (2007). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Intellectual Property The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Acknowledgement Funding for the RFC Editor function is currently provided by the Internet Society. Wing Best Current Practice PAGE 6 top

Symmetric RTP / RTP Control Protocol (RTCP) RFC TOTAL SIZE: 12539 bytes PUBLICATION DATE: Tuesday, July 31st, 2007 LEGAL RIGHTS: The IETF Trust (see BCP 78)


RFC-ARCHIVE.ORG

© RFC 4961: The IETF Trust, Tuesday, July 31st, 2007
© the RFC Archive, 2024, RFC-Archive.org
Maintainer: J. Tunnissen

Privacy Statement