Skip to main content

A Mechanism for ECN Path Probing and Fallback

Document Type Expired Internet-Draft (individual)
Authors Mirja Kühlewind , Brian Trammell
Last updated 2014-03-14 (Latest revision 2013-09-10)
Stream (None)
Intended RFC status (None)
Expired & archived
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
Send notices to (None)
This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at:


Explicit Congestion Notification (ECN) is a TCP/IP extension that is widely implemented but hardly used due to the perceived unusablilty of ECN on many paths through the Internet caused by ECN-ignorant routers and middleboxes. This document specifies an ECN probing and fall-back mechanism in case ECN has be successfully negotiated between two connection endpoints, but might not be usable on the path.


Mirja Kühlewind
Brian Trammell

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)