Considerations around Transport Header Confidentiality, Network Operations, and the Evolution of Internet Transport Protocols
draft-ietf-tsvwg-transport-encrypt-10
TSVWG G. Fairhurst
Internet-Draft University of Aberdeen
Intended status: Informational C. Perkins
Expires: July 12, 2020 University of Glasgow
January 9, 2020
Considerations around Transport Header Confidentiality, Network
Operations, and the Evolution of Internet Transport Protocols
draft-ietf-tsvwg-transport-encrypt-10
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
Task Force (IETF). Note that other groups may also distribute
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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 July 12, 2020.
Fairhurst & Perkins Expires July 12, 2020 [Page 1]
Internet-Draft Transport Header Encryption January 2020
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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 . . . . . 7
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 . . . . . . . . . . . . . . . . . . 18
3.3. Use for Network Diagnostics and Troubleshooting . . . . . 21
3.4. Header Compression . . . . . . . . . . . . . . . . . . . 23
4. Encryption and Authentication of Transport Headers . . . . . 23
4.1. Motivation . . . . . . . . . . . . . . . . . . . . . . . 23
4.2. Approaches to Transport Header Protection . . . . . . . . 24
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 . . . . . . . . . . . . . . . . . 28
6.2. Characterising "Unknown" Network Traffic . . . . . . . . 30
6.3. Accountability and Internet Transport Protocols . . . . . 30
6.4. Impact on Operational Cost . . . . . . . . . . . . . . . 31
6.5. Impact on Research, Development and Deployment . . . . . 31
7. Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . 32
8. Security Considerations . . . . . . . . . . . . . . . . . . . 35
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 37
10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 38
11. Informative References . . . . . . . . . . . . . . . . . . . 38
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