Datagram Congestion Control Protocol (DCCP) Simultaneous-Open Technique to Facilitate NAT/Middlebox Traversal
RFC 5596
Document | Type |
RFC - Proposed Standard
(September 2009; No errata)
Updates RFC 4340
|
|
---|---|---|---|
Author | Gorry Fairhurst | ||
Last updated | 2015-10-14 | ||
Replaces | draft-fairhurst-dccp-behave-update | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | WG Document | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 5596 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Lars Eggert | ||
Send notices to | (None) |
Network Working Group G. Fairhurst Request for Comments: 5596 University of Aberdeen Updates: 4340 September 2009 Category: Standards Track Datagram Congestion Control Protocol (DCCP) Simultaneous-Open Technique to Facilitate NAT/Middlebox Traversal Abstract This document specifies an update to the Datagram Congestion Control Protocol (DCCP), a connection-oriented and datagram-based transport protocol. The update adds support for the DCCP-Listen packet. This assists DCCP applications to communicate through middleboxes (e.g., a Network Address Port Translator or a DCCP server behind a firewall), where peering endpoints need to initiate communication in a near- simultaneous manner to establish necessary middlebox state. Status of This Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright and License Notice Copyright (c) 2009 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. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the BSD License. This document may contain material from IETF Documents or IETF Contributions published or made publicly available before November 10, 2008. The person(s) controlling the copyright in some of this material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. Without obtaining an adequate license from the person(s) controlling Fairhurst Standards Track [Page 1] RFC 5596 DCCP Simultaneous-Open Technique September 2009 the copyright in such materials, this document may not be modified outside the IETF Standards Process, and derivative works of it may not be created outside the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Scope of This Document . . . . . . . . . . . . . . . . . . 3 1.2. DCCP NAT Traversal . . . . . . . . . . . . . . . . . . . . 4 1.3. Structure of This Document . . . . . . . . . . . . . . . . 4 2. Procedure for Near-Simultaneous-Open . . . . . . . . . . . . . 5 2.1. Conventions and Terminology . . . . . . . . . . . . . . . 5 2.2. Protocol Method . . . . . . . . . . . . . . . . . . . . . 5 2.2.1. DCCP-Listen Packet Format . . . . . . . . . . . . . . 6 2.2.2. Protocol Method for DCCP Server Endpoints . . . . . . 7 2.2.3. Protocol Method for DCCP Client Endpoints . . . . . . 11 2.2.4. Processing by Routers and Middleboxes . . . . . . . . 11 2.3. Examples of Use . . . . . . . . . . . . . . . . . . . . . 12 2.3.1. Repetition of DCCP-Listen . . . . . . . . . . . . . . 13 2.3.2. Optional Triggered Retransmission of DCCP-Request . . 14 2.4. Backwards Compatibility with RFC 4340 . . . . . . . . . . 16 3. Discussion of Design Decisions . . . . . . . . . . . . . . . . 16 3.1. Rationale for a New Packet Type . . . . . . . . . . . . . 17 3.1.1. Use of Sequence Numbers . . . . . . . . . . . . . . . 18 3.2. Generation of Listen Packets . . . . . . . . . . . . . . . 18 3.3. Repetition of DCCP-Listen Packets . . . . . . . . . . . . 18 4. Security Considerations . . . . . . . . . . . . . . . . . . . 19 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 20 6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 20 7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 21 7.1. Normative References . . . . . . . . . . . . . . . . . . . 21 7.2. Informative References . . . . . . . . . . . . . . . . . . 21 Appendix A. Discussion of Existing NAT Traversal Techniques . . . 23 A.1. NAT Traversal Based on a Simultaneous-Request . . . . . . 24 A.2. Role Reversal . . . . . . . . . . . . . . . . . . . . . . 25 Fairhurst Standards Track [Page 2]Show full document text