Transmission Control Protocol Specification
draft-ietf-tcpm-rfc793bis-15

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Internet Engineering Task Force                             W. Eddy, Ed.
Internet-Draft                                               MTI Systems
Obsoletes: 793, 879, 2873, 6093, 6429,                 December 20, 2019
           6528, 6691 (if approved)
Updates: 5961, 1122 (if approved)
Intended status: Standards Track
Expires: June 22, 2020

              Transmission Control Protocol Specification
                      draft-ietf-tcpm-rfc793bis-15

Abstract

   This document specifies the Internet's Transmission Control Protocol
   (TCP).  TCP is an important transport layer protocol in the Internet
   stack, and has continuously evolved over decades of use and growth of
   the Internet.  Over this time, a number of changes have been made to
   TCP as it was specified in RFC 793, though these have only been
   documented in a piecemeal fashion.  This document collects and brings
   those changes together with the protocol specification from RFC 793.
   This document obsoletes RFC 793, as well as 879, 2873, 6093, 6429,
   6528, and 6691 that updated parts of RFC 793.  It updates RFC 1122,
   and should be considered as a replacement for the portions of that
   document dealing with TCP requirements.  It updates RFC 5961 due to a
   small clarification in reset handling while in the SYN-RECEIVED
   state.

   RFC EDITOR NOTE: If approved for publication as an RFC, this should
   be marked additionally as "STD: 7" and replace RFC 793 in that role.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [4].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

Eddy                      Expires June 22, 2020                 [Page 1]
Internet-Draft              TCP Specification              December 2019

   Internet-Drafts are draft documents valid for a maximum of six months
   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 June 22, 2020.

Copyright Notice

   Copyright (c) 2019 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
   (https://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.

   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
   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.  Purpose and Scope . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Key TCP Concepts  . . . . . . . . . . . . . . . . . . . .   5
   3.  Functional Specification  . . . . . . . . . . . . . . . . . .   6
     3.1.  Header Format . . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  Terminology Overview  . . . . . . . . . . . . . . . . . .  11
       3.2.1.  Key Connection State Variables  . . . . . . . . . . .  11
       3.2.2.  State Machine Overview  . . . . . . . . . . . . . . .  13
     3.3.  Sequence Numbers  . . . . . . . . . . . . . . . . . . . .  16
     3.4.  Establishing a connection . . . . . . . . . . . . . . . .  22
     3.5.  Closing a Connection  . . . . . . . . . . . . . . . . . .  29
       3.5.1.  Half-Closed Connections . . . . . . . . . . . . . . .  31

Eddy                      Expires June 22, 2020                 [Page 2]
Internet-Draft              TCP Specification              December 2019