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
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Replaces | draft-fairhurst-dccp-behave-update | ||
| Stream | IETF | ||
| Formats | plain text pdf html 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
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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
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