TCP over Constrained-Node Networks
draft-gomez-lwig-tcp-constrained-node-networks-02

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LWIG Working Group                                              C. Gomez
Internet-Draft                                                 UPC/i2CAT
Intended status: Informational                              J. Crowcroft
Expires: September 11, 2017                      University of Cambridge
                                                          March 10, 2017

                   TCP over Constrained-Node Networks
           draft-gomez-lwig-tcp-constrained-node-networks-02

Abstract

   This document provides a profile for the Transmission Control
   Protocol (TCP) over Constrained-Node Networks (CNNs).  The
   overarching goal is to offer simple measures to allow for lightweight
   TCP implementation and suitable operation in such environments.

Status of This Memo

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   This Internet-Draft will expire on September 11, 2017.

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   Copyright (c) 2017 IETF Trust and the persons identified as the
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Gomez & Crowcroft      Expires September 11, 2017               [Page 1]
Internet-Draft                TCP over CNNs                   March 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions used in this document . . . . . . . . . . . .   3
   2.  Characteristics of CNNs relevant for TCP  . . . . . . . . . .   3
   3.  Scenario  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  TCP over CNNs . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  TCP connection initiation . . . . . . . . . . . . . . . .   4
     4.2.  Maximum Segment Size (MSS)  . . . . . . . . . . . . . . .   4
     4.3.  Window Size . . . . . . . . . . . . . . . . . . . . . . .   5
     4.4.  RTO estimation  . . . . . . . . . . . . . . . . . . . . .   6
     4.5.  TCP connection lifetime . . . . . . . . . . . . . . . . .   6
       4.5.1.  Long TCP connection lifetime  . . . . . . . . . . . .   6
       4.5.2.  Short TCP connection lifetime . . . . . . . . . . . .   7
     4.6.  Explicit congestion notification  . . . . . . . . . . . .   7
     4.7.  TCP options . . . . . . . . . . . . . . . . . . . . . . .   8
     4.8.  Delayed Acknowledgments . . . . . . . . . . . . . . . . .   9
     4.9.  Explicit loss notifications . . . . . . . . . . . . . . .   9
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   7.  Annex. TCP implementations for constrained devices  . . . . .  10
     7.1.  uIP . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     7.2.  lwIP  . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     7.3.  RIOT  . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     7.4.  OpenWSN . . . . . . . . . . . . . . . . . . . . . . . . .  11
     7.5.  Summary . . . . . . . . . . . . . . . . . . . . . . . . .  11
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   The Internet Protocol suite is being used for connecting Constrained-
   Node Networks (CNNs) to the Internet, enabling the so-called Internet
   of Things (IoT) [RFC7228].  In order to meet the requirements that
   stem from CNNs, the IETF has produced a suite of protocols
   specifically designed for such environments
   [I-D.ietf-lwig-energy-efficient].

   At the application layer, the Constrained Application Protocol (CoAP)
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