On the state of ECN and TCP options on the internet

Authors:
Mirja Kühlewind;Sebastian Neuner;Brian Trammell
Affiliations:
Institute of Communication Networks and Computer Engineering (IKR), University of Stuttgart, Germany;Institute of Communication Networks and Computer Engineering (IKR), University of Stuttgart, Germany;Communication Systems Group, ETH Zürich, Switzerland
Venue:
PAM'13 Proceedings of the 14th international conference on Passive and Active Measurement
Year:
2013

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Abstract

Explicit Congestion Notification (ECN) is a TCP/IP extension that can avoid packet loss and thus improve network performance. Though standardized in 2001, it is barely used in today's Internet. This study, following on previous active measurement studies over the past decade, shows marked and continued increase in the deployment of ECN-capable servers, and usability of ECN on the majority of paths to such servers. We additionally present new measurements of ECN on IPv6, passive observation of actual ECN usage from flow data, and observations on other congestion-relevant TCP options (SACK, Timestamps and Window Scaling). We further present initial work on burst loss metrics for loss-based congestion control following from our findings.