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Michael Welzl University of Oslo

The Benefits and Pitfalls of using Explicit Congestion Notification (ECN) draft-ietf-aqm-ecn-benefits-00. Michael Welzl University of Oslo. Gorry Fairhurst University of Aberdeen. 91st IETF Meeting Honolulu, Hawaii 10 November 2014. Draft goals. Point of draft: document gains of ECN

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Michael Welzl University of Oslo

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  1. The Benefits and Pitfalls of using Explicit Congestion Notification (ECN)draft-ietf-aqm-ecn-benefits-00 Michael WelzlUniversity of Oslo Gorry FairhurstUniversity of Aberdeen 91st IETF Meeting Honolulu, Hawaii10 November 2014

  2. Draft goals • Point of draft: • document gains of ECN • includes less obvious gains • Could include deployment scenarios to illustrate benefit • NEW: now also “pitfalls” (next slide) • Out of scope: • To recommend a specific behavior

  3. Pitfalls • Policies that bleach and middlebox requirements to deploy • Also points to RFC6040 for correct use of tunnelling • Cheating by hosts • Possible need for mechanisms to verify if a path really supports ECN

  4. New conclusion(not “turn it on”, but “don’t break it”) • People configuring host stacks and network devices should ensure that their equipment correctly reacts to packets carrying ECN codepoints. • This includes: • routers not resetting the ECN codepoint to zero • middleboxes not resetting the ECN codepoint to zero • correctly updating the codepoint when congested • routers correctly supporting alternate ECN semantics ([RFC4774]) • hosts receiving ECN marks correctly reflecting them

  5. Next Steps • Aim to WGLC after next (Dallas) IETF! • Deployment scenarios / use cases still pretty empty • This section could be small • Text donations welcome • Other comments?

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