Considerations around Transport Header Confidentiality, Network Operations, and the Evolution of Internet Transport Protocols
draft-ietf-tsvwg-transport-encrypt-09

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Last updated 2019-11-03
Replaces draft-fairhurst-tsvwg-transport-encrypt
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TSVWG                                                       G. Fairhurst
Internet-Draft                                    University of Aberdeen
Intended status: Informational                                C. Perkins
Expires: May 6, 2020                               University of Glasgow
                                                        November 3, 2019

    Considerations around Transport Header Confidentiality, Network
     Operations, and the Evolution of Internet Transport Protocols
                 draft-ietf-tsvwg-transport-encrypt-09

Abstract

   To protect user data and privacy, Internet transport protocols have
   supported payload encryption and authentication for some time.  Such
   encryption and authentication is now also starting to be applied to
   the transport protocol headers.  This helps avoid transport protocol
   ossification by middleboxes, while also protecting metadata about the
   communication.  Current operational practice in some networks inspect
   transport header information within the network, but this is no
   longer possible when those transport headers are encrypted.  This
   document discusses the possible impact when network traffic uses a
   protocol with an encrypted transport header.  It suggests issues to
   consider when designing new transport protocols, to account for
   network operations, prevent network ossification, and enable
   transport evolution, while still respecting user privacy.

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
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   This Internet-Draft will expire on May 6, 2020.

Fairhurst & Perkins        Expires May 6, 2020                  [Page 1]
Internet-Draft            Transport Encryption             November 2019

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Context and Rationale . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Use of Transport Header Information in the Network  . . .   5
     2.2.  Authentication of Transport Header Information  . . . . .   6
     2.3.  Observable Transport Header Fields  . . . . . . . . . . .   7
   3.  Current uses of Transport Headers within the Network  . . . .  10
     3.1.  Observing Transport Information in the Network  . . . . .  11
     3.2.  Transport Measurement . . . . . . . . . . . . . . . . . .  17
     3.3.  Use for Network Diagnostics and Troubleshooting . . . . .  21
     3.4.  Header Compression  . . . . . . . . . . . . . . . . . . .  22
   4.  Encryption and Authentication of Transport Headers  . . . . .  23
   5.  Addition of Transport Information to Network-Layer Headers  .  26
     5.1.  Use of OAM within a Maintenance Domain  . . . . . . . . .  26
     5.2.  Use of OAM across Multiple Maintenance Domains  . . . . .  26
   6.  Implications of Protecting the Transport Headers  . . . . . .  27
     6.1.  Independent Measurement . . . . . . . . . . . . . . . . .  27
     6.2.  Characterising "Unknown" Network Traffic  . . . . . . . .  29
     6.3.  Accountability and Internet Transport Protocols . . . . .  30
     6.4.  Impact on Operational Cost  . . . . . . . . . . . . . . .  30
     6.5.  Impact on Research, Development and Deployment  . . . . .  31
   7.  Conclusions . . . . . . . . . . . . . . . . . . . . . . . . .  32
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  35
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  37
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  37
   11. Informative References  . . . . . . . . . . . . . . . . . . .  38
   Appendix A.  Revision information . . . . . . . . . . . . . . . .  45
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  47
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