Services Provided by IETF Transport Protocols and Congestion Control Mechanisms
RFC 8095

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Internet Engineering Task Force (IETF)                 G. Fairhurst, Ed.
Request for Comments: 8095                        University of Aberdeen
Category: Informational                                 B. Trammell, Ed.
ISSN: 2070-1721                                       M. Kuehlewind, Ed.
                                                              ETH Zurich
                                                              March 2017

                          Services Provided by
       IETF Transport Protocols and Congestion Control Mechanisms

Abstract

   This document describes, surveys, and classifies the protocol
   mechanisms provided by existing IETF protocols, as background for
   determining a common set of transport services.  It examines the
   Transmission Control Protocol (TCP), Multipath TCP, the Stream
   Control Transmission Protocol (SCTP), the User Datagram Protocol
   (UDP), UDP-Lite, the Datagram Congestion Control Protocol (DCCP), the
   Internet Control Message Protocol (ICMP), the Real-Time Transport
   Protocol (RTP), File Delivery over Unidirectional Transport /
   Asynchronous Layered Coding (FLUTE/ALC) for Reliable Multicast, NACK-
   Oriented Reliable Multicast (NORM), Transport Layer Security (TLS),
   Datagram TLS (DTLS), and the Hypertext Transport Protocol (HTTP),
   when HTTP is used as a pseudotransport.  This survey provides
   background for the definition of transport services within the TAPS
   working group.

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 7841.

   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/rfc8095.

Fairhurst, et al.             Informational                     [Page 1]
RFC 8095                   Transport Services                 March 2017

Copyright Notice

   Copyright (c) 2017 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 Simplified BSD License.

Table of Contents

   1. Introduction ....................................................4
      1.1. Overview of Transport Features .............................4
   2. Terminology .....................................................5
   3. Existing Transport Protocols ....................................6
      3.1. Transport Control Protocol (TCP) ...........................6
           3.1.1. Protocol Description ................................6
           3.1.2. Interface Description ...............................8
           3.1.3. Transport Features ..................................9
      3.2. Multipath TCP (MPTCP) .....................................10
           3.2.1. Protocol Description ...............................10
           3.2.2. Interface Description ..............................10
           3.2.3. Transport Features .................................11
      3.3. User Datagram Protocol (UDP) ..............................11
           3.3.1. Protocol Description ...............................11
           3.3.2. Interface Description ..............................12
           3.3.3. Transport Features .................................13
      3.4. Lightweight User Datagram Protocol (UDP-Lite) .............13
           3.4.1. Protocol Description ...............................13
           3.4.2. Interface Description ..............................14
           3.4.3. Transport Features .................................14
      3.5. Stream Control Transmission Protocol (SCTP) ...............14
           3.5.1. Protocol Description ...............................15
           3.5.2. Interface Description ..............................17
           3.5.3. Transport Features .................................19
      3.6. Datagram Congestion Control Protocol (DCCP) ...............20
           3.6.1. Protocol Description ...............................21
           3.6.2. Interface Description ..............................22