[Ecn-sane] ECN usable with UDP paper

Dave Taht dave.taht at gmail.com
Mon Sep 24 14:33:49 EDT 2018

On Mon, Sep 24, 2018 at 11:18 AM Bruno George Moraes <brunogm0 at gmail.com> wrote:
> https://csperkins.org/publications/2015/10/mcquistin2015ecn-udp.html
> Using measurements from the author’s homes, their workplace, and cloud servers in each of the nine EC2 regions worldwide, we test reachability of 2500 servers from the public NTP server pool, using ECT(0) and not-ECT marked UDP packets. We show that an average of 98.97% of the NTP servers that are reachable using not-ECT marked packets are also reachable using ECT(0) marked UDP packets, and that 98% of network hops pass ECT(0) marked packets without clearing the ECT bits. We compare reachability of the same hosts using ECN with TCP, finding that 82.0% of those reachable with TCP can successfully negotiate and use ECN. Our findings suggest that ECN is broadly usable with UDP traffic, and that support for use of ECN with TCP has increased.
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Yep. So my follow-on questions are:

Would a NTP reflection attack be worse with ecn enabled?
Should ntp servers accept ect marked packets in the first place? If
so, what, if anything, should they do with a CE?


Dave Täht
CEO, TekLibre, LLC
Tel: 1-669-226-2619

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