Re: [tsvwg] Fwd: New Version Notification for draft-heist-tsvwg-ecn-deployment-observations-00.txt

Jonathan Morton <> Fri, 19 February 2021 13:34 UTC

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From: Jonathan Morton <>
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Date: Fri, 19 Feb 2021 15:34:07 +0200
Cc: Pete Heist <>, TSVWG <>
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To: Bob Briscoe <>
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Subject: Re: [tsvwg] Fwd: New Version Notification for draft-heist-tsvwg-ecn-deployment-observations-00.txt
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> On 19 Feb, 2021, at 2:50 pm, Bob Briscoe <> wrote:
> Given you have close contact with this ISP, have you asked, or could you ask them whether they have ever deployed any FIFO ECN-enabled AQMs themselves? 

As far as I'm aware, they have only used fq_codel for ECN.  Before that, they were using SFQ in some places, without any AQM.

However, I would remind you that neither SFQ nor fq_codel can distinguish between flows carried inside an encrypted tunnel, so this cannot be relied upon alone to make L4S safe.  Pete's data shows significant tunnelled traffic, much of which is probably due to people working from home and using VPNs to access a corporate network.

 - Jonathan Morton