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RFC 9601
Title: Propagating Explicit Congestion Notification across
IP Tunnel Headers Separated by a Shim
Author: B. Briscoe
Status: Standards Track
Stream: IETF
Date: August 2024
Mailbox: [email protected]
Pages: 19
Updates: RFC 2661, RFC 2784, RFC 3931, RFC 4380,
RFC 6040, RFC 7450
I-D Tag: draft-ietf-tsvwg-rfc6040update-shim-23.txt
URL: https://www.rfc-editor.org/info/rfc9601
DOI: 10.17487/RFC9601
RFC 6040 on "Tunnelling of Explicit Congestion Notification" made the
rules for propagation of Explicit Congestion Notification (ECN)
consistent for all forms of IP-in-IP tunnel. This specification
updates RFC 6040 to clarify that its scope includes tunnels where two
IP headers are separated by at least one shim header that is not
sufficient on its own for wide-area packet forwarding. It surveys
widely deployed IP tunnelling protocols that use such shim headers
and updates the specifications of those that do not mention ECN
propagation (including RFCs 2661, 3931, 2784, 4380 and 7450, which
specify L2TPv2, L2TPv3, Generic Routing Encapsulation (GRE), Teredo,
and Automatic Multicast Tunneling (AMT), respectively). This
specification also updates RFC 6040 with configuration requirements
needed to make any legacy tunnel ingress safe.
This document is a product of the Transport and Services Working Group Working
Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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