Explicit Congestion Notification (ECN) Deployment Observations
draft-heist-tsvwg-ecn-deployment-observations-01

Document Type Active Internet-Draft (individual)
Author Peter Heist 
Last updated 2021-02-20
Stream (None)
Intended RFC status (None)
Formats plain text html xml pdf htmlized (tools) htmlized bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
Transport Working Group                                         P. Heist
Internet-Draft                                          20 February 2021
Intended status: Informational                                          
Expires: 24 August 2021

     Explicit Congestion Notification (ECN) Deployment Observations
            draft-heist-tsvwg-ecn-deployment-observations-01

Abstract

   This note presents data gathered at an Internet Service Provider's
   gateway on the observed deployment and usage of ECN.  Relevant IP
   counter and flow tracking data was collected and analyzed for TCP and
   other protocols.

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/.

   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 24 August 2021.

Copyright Notice

   Copyright (c) 2021 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.

Heist                    Expires 24 August 2021                 [Page 1]
Internet-Draft                   ecndep                    February 2021

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Collection Details  . . . . . . . . . . . . . . . . . . . . .   3
   3.  Observations  . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  ECN Endpoint Activity . . . . . . . . . . . . . . . . . .   4
       3.1.1.  Client Initiation . . . . . . . . . . . . . . . . . .   4
       3.1.2.  Server Acceptance . . . . . . . . . . . . . . . . . .   4
     3.2.  RFC3168 AQM Activity  . . . . . . . . . . . . . . . . . .   4
     3.3.  ECN Codepoints on Non-TCP Protocols . . . . . . . . . . .   4
       3.3.1.  Tunneled Traffic  . . . . . . . . . . . . . . . . . .   5
       3.3.2.  Use of the ECN Field for Historical Reasons . . . . .   6
       3.3.3.  Use of the ECN Field Inadvertently  . . . . . . . . .   6
       3.3.4.  Use of the ECN Field Maliciously  . . . . . . . . . .   7
   4.  Study Limitations and Recommendations for Future Work . . . .   7
     4.1.  ECN Acceptance Rate . . . . . . . . . . . . . . . . . . .   7
     4.2.  Not-ECT Counts by IP  . . . . . . . . . . . . . . . . . .   7
     4.3.  Tunnels . . . . . . . . . . . . . . . . . . . . . . . . .   7
     4.4.  Non-TCP Protocols . . . . . . . . . . . . . . . . . . . .   8
     4.5.  Other Protocols . . . . . . . . . . . . . . . . . . . . .   8
     4.6.  NS Flag . . . . . . . . . . . . . . . . . . . . . . . . .   8
   5.  Abbreviated Output from ecn-stats . . . . . . . . . . . . . .   8
     5.1.  All IP  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     5.2.  TCP initiated from LAN to WAN . . . . . . . . . . . . . .   9
     5.3.  Non-TCP conntrack-supported protocols initiated from LAN to
           WAN . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  26
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  26
   8.  Affiliation . . . . . . . . . . . . . . . . . . . . . . . . .  26
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  26
   10. Informative References  . . . . . . . . . . . . . . . . . . .  26
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  27

1.  Introduction

   To help guide the evolution of ECN, there is a need for more data on
   current deployment status, and observed usage of the ECN related
   bits, including:

   *  the initiation and acceptance of ECN capable TCP flows

   *  marking via CE, and feedback for TCP via the ECE and CWR flags

   *  codepoints set on packets for protocols other than TCP

Heist                    Expires 24 August 2021                 [Page 2]
Internet-Draft                   ecndep                    February 2021

   For several weeks, we gathered data on all traffic through an
   Internet Service Provider's gateway.  Though some of the results are
Show full document text