ECN++: Adding Explicit Congestion Notification (ECN) to TCP Control Packets
draft-ietf-tcpm-generalized-ecn-05

Document Type Active Internet-Draft (tcpm WG)
Last updated 2019-11-03
Replaces draft-bagnulo-tcpm-generalized-ecn
Stream IETF
Intended RFC status Experimental
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Network Working Group                                         M. Bagnulo
Internet-Draft                                                      UC3M
Obsoletes: 5562 (if approved)                                 B. Briscoe
Intended status: Experimental                                Independent
Expires: May 6, 2020                                    November 3, 2019

  ECN++: Adding Explicit Congestion Notification (ECN) to TCP Control
                                Packets
                   draft-ietf-tcpm-generalized-ecn-05

Abstract

   This document describes an experimental modification to ECN when used
   with TCP.  It allows the use of ECN on the following TCP packets:
   SYNs, pure ACKs, Window probes, FINs, RSTs and retransmissions.

Status of This Memo

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Bagnulo & Briscoe          Expires May 6, 2020                  [Page 1]
Internet-Draft                    ECN++                    November 2019

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
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   than English.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Motivation  . . . . . . . . . . . . . . . . . . . . . . .   4
     1.2.  Experiment Goals  . . . . . . . . . . . . . . . . . . . .   5
     1.3.  Document Structure  . . . . . . . . . . . . . . . . . . .   6
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   6
   3.  Specification . . . . . . . . . . . . . . . . . . . . . . . .   7
     3.1.  Network (e.g. Firewall) Behaviour . . . . . . . . . . . .   7
     3.2.  Sender Behaviour  . . . . . . . . . . . . . . . . . . . .   8
       3.2.1.  SYN (Send)  . . . . . . . . . . . . . . . . . . . . .   9
       3.2.2.  SYN-ACK (Send)  . . . . . . . . . . . . . . . . . . .  13
       3.2.3.  Pure ACK (Send) . . . . . . . . . . . . . . . . . . .  14
       3.2.4.  Window Probe (Send) . . . . . . . . . . . . . . . . .  15
       3.2.5.  FIN (Send)  . . . . . . . . . . . . . . . . . . . . .  16
       3.2.6.  RST (Send)  . . . . . . . . . . . . . . . . . . . . .  16
       3.2.7.  Retransmissions (Send)  . . . . . . . . . . . . . . .  17
       3.2.8.  General Fall-back for any Control Packet or
               Retransmission  . . . . . . . . . . . . . . . . . . .  17
     3.3.  Receiver Behaviour  . . . . . . . . . . . . . . . . . . .  17
       3.3.1.  Receiver Behaviour for Any TCP Control Packet or
               Retransmission  . . . . . . . . . . . . . . . . . . .  18
       3.3.2.  SYN (Receive) . . . . . . . . . . . . . . . . . . . .  18
       3.3.3.  Pure ACK (Receive)  . . . . . . . . . . . . . . . . .  19
       3.3.4.  FIN (Receive) . . . . . . . . . . . . . . . . . . . .  19
       3.3.5.  RST (Receive) . . . . . . . . . . . . . . . . . . . .  20
       3.3.6.  Retransmissions (Receive) . . . . . . . . . . . . . .  20
   4.  Rationale . . . . . . . . . . . . . . . . . . . . . . . . . .  20
     4.1.  The Reliability Argument  . . . . . . . . . . . . . . . .  20
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