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Re: [tsvwg] ECT(1) Flag Day Plausibility

Jonathan Morton <chromatix99@gmail.com> Fri, 14 May 2021 19:24 UTC

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From: Jonathan Morton <chromatix99@gmail.com>
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Date: Fri, 14 May 2021 22:24:27 +0300
Cc: tsvwg@ietf.org
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To: "Bless, Roland (TM)" <roland.bless@kit.edu>
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Subject: Re: [tsvwg] ECT(1) Flag Day Plausibility
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> On 14 May, 2021, at 3:35 pm, Bless, Roland (TM) <roland.bless@kit.edu> wrote:
> 
> I'd expect many home routers to be the bottleneck, so their potential
> CE marks wouldn't be visible in the Internet, but merely the
> corresponding ECE flags in TCP packets.

Additionally, if the traffic passing through them is Not-ECT, neither CE marks nor ECE flags would be visible.  Since the majority of endpoints are still not configured to initiate ECN negotiation, this is problematic for finding these deployments with either a passive monitor or an external active probe.

However, they would still have the same interaction between L4S and non-L4S traffic, even if the latter is Not-ECT, so they can't be dismissed just because they are difficult to see.

 - Jonathan Morton

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