2.8.2 Datagram Congestion Control Protocol (dccp)

NOTE: This charter is a snapshot of the 72nd IETF Meeting in Dublin, Ireland. It may now be out-of-date.
In addition to this official charter maintained by the IETF Secretariat, there is additional information about this working group on the Web at:

       Additional DCCP Web Page

Last Modified: 2008-03-18


Thomas Phelan <tphelan@sonusnet.com>
Gorry Fairhurst <gorry@erg.abdn.ac.uk>

Transport Area Director(s):

Magnus Westerlund <magnus.westerlund@ericsson.com>
Lars Eggert <lars.eggert@nokia.com>

Transport Area Advisor:

Lars Eggert <lars.eggert@nokia.com>

Mailing Lists:

General Discussion: dccp@ietf.org
To Subscribe: dccp-request@ietf.org
In Body: (un)subscribe
Archive: http://www.ietf.org/mail-archive/web/dccp/index.html

Description of Working Group:

The Datagram Control Protocol working group is chartered to develop and
standardize the Datagram Congestion Control Protocol (DCCP). DCCP is a
minimal general purpose transport-layer protocol providing only two
core functions:

- the establishment, maintenance and teardown of an unreliable packet

- congestion control of that packet flow.

Within the constraints of providing these core functions, DCCP aims to
be a general purpose protocol, minimizing the overhead of packet
size or end-node processing as much as possible. Therefore, DCCP is as
simple as possible, and as far as reasonably possible, it should avoid
providing higher-level transport functionality. DCCP will provide a
congestion-controlled, unreliable packet stream, without TCP's
reliability or in-order delivery semantics. Additional unicast,
flow-based application functionality can be layered over DCCP.


Drafts for DCCP, and several associated congestion control IDs, already
exist. The first task before the working group will be an abbreviated
functional requirement validation of those drafts. There are two
possible outcomes:

1) The current DCCP draft is declared suitable for further work, with
  some areas listed for possible extension.

2) The current DCCP draft is declared unsuitable for further work, and
  more formal functional requirement exploration begins.

Prior to the final development of the protocol, the working group will
investigate areas of functionality that should be integrated into DCCP
because they are difficult or impossible to layer above it. These areas
include security and multi-homing/mobility, at a minimum. The protocol
will be for both IPv4 and IPv6. It will not encompass multicast. It
is strictly a unicast transport.

For security, the working group will endeavor to ensure that DCCP
incorporates good non-cryptographic mechanisms that make it resistant
to denial-of-service attacks on DCCP connections and DCCP servers. A
related topic that will be explored is whether DCCP can be a candidate
to replace UDP in the transport of security management protocols such
as IKE and JFK.

The working group will also investigate DCCP's relationship with RTP
(the Real-time Transport Protocol).

Once the DCCP specification has stabilized, the WG will produce a
document providing guidance to potential users of DCCP. The precise
form of this document will be determined by WG discussion, but it
include example APIs, an applicability statement, or other forms of
guidance about appropriate usage of DCCP.

Goals and Milestones:

Done  Publish summary of required protocol functions/requirements
Done  Decision to build on proposed DCCP protocol, alternate protocol, or quit and go home
Done  Detailed review of spec and CCIDs
Done  Public design review at IETF meeting
Done  Working group last call for spec and CCIDs
Done  Submit DCCP spec for IESG/IETF review to be Proposed Standard
Done  Submit DCCP CCIDs for IESG/IETF review to be Proposed Standard
Done  Complete WGLC draft-ietf-dccp-problem-xx as Informational
Done  Complete WGLC draft-ietf-dccp-tfrc-voip as Experimental
Done  Complete WGLC 'RTP over DCCP' as PS
Done  Complete WGLC 'DTLS over DCCP' as PS
Oct 2007  Complete WGLC for updated TFRC (rfc3448bis) as PS
Dec 2007  Complete WGLC for updated Service Codes as PS
Mar 2008  Complete WGLC for draft-ietf-dccp-rfc3448bis as PS
Apr 2008  Complete WGLC for draft-ietf-dccp-serv-codes as PS
Jul 2008  Complete WGLC draft-ietf-dccp-ccid4 as Experimental
Sep 2008  Complete WGLC draft-ietf-dccp-tfrc-faster-restart as Experimental
Sep 2008  Complete WGLC for draft-ietf-dccp-simul-open as PS
Dec 2008  Complete WGLC draft-ietf-dccp-user-guide as Informational


  • draft-ietf-dccp-tfrc-faster-restart-05.txt
  • draft-ietf-dccp-rtp-07.txt
  • draft-ietf-dccp-rfc3448bis-05.txt
  • draft-ietf-dccp-dtls-05.txt
  • draft-ietf-dccp-serv-codes-04.txt
  • draft-ietf-dccp-ccid4-02.txt
  • draft-ietf-dccp-simul-open-00.txt

    Request For Comments:

    RFC4336 I Problem Statement for the Datagram Congestion Control Protocol (DCCP)
    RFC4340 PS Datagram Congestion Control Protocol (DCCP)
    RFC4341 PS Profile for Datagram Congestion Control Protocol (DCCP) Congestion Control ID 2: TCP-like Congestion Control
    RFC4342 PS Profile for Datagram Congestion Control Protocol (DCCP) Congestion Control ID 3: TCP-Friendly Rate Control (TFRC)
    RFC4828 E TCP Friendly Rate Control (TFRC): the Small-Packet (SP) Variant

    Meeting Minutes


    WG Chair
    Service Codes
    Simul Open
    Quick Start for DCCP
    Sender RTT Estimate Option
    DCCP NAT Encap
    Implementation Status (T Phelan)
    Implementation Status (G Renker)