A Mechanism for ECN Path Probing and Fallback

Document Type Expired Internet-Draft (individual)
Authors Mirja K├╝hlewind  , Brian Trammell 
Last updated 2014-03-14 (latest revision 2013-09-10)
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This Internet-Draft is no longer active.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 K├╝hlewind (mirja.kuehlewind@ikr.uni-stuttgart.de)
Brian Trammell (trammell@tik.ee.ethz.ch)

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