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Accurate ECN Feedback Option in TCP

Document type: Expired Internet-Draft (individual)
Document stream: No stream defined
Last updated: 2013-01-14 (latest revision 2012-07-13)
Intended RFC status: Unknown
Other versions: (expired, archived): plain text, pdf, html

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IESG State: Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found here:


This document specifies an TCP option to get accurate Explicit Congestion Notification (ECN) feedback from the receiver. ECN is an IP/TCP mechanism where network nodes can mark IP packets instead of dropping them to indicate congestion to the end-points. An ECN- capable receiver will feedback this information to the sender. ECN is specified for TCP in such a way that only one feedback signal can be transmitted per Round-Trip Time (RTT). Recently new TCP mechanisms like ConEx or DCTCP need more accurate feedback information in the case where more than one marking is received in one RTT. This TCP extension can be used in addition to the classic ECN as well as with a more accurate ECN scheme recently proposed which reuses the ECN bit in the TCP header.


Mirja Kuehlewind <>
Richard Scheffenegger <>

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