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
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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Task Force (IETF). Note that other groups may also distribute
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and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 11, 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
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described in the Simplified BSD License.
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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