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From: Jonathan Morton <chromatix99@gmail.com>
To: Sebastian Moeller <moeller0@gmx.de>
Cc: ECN-Sane <ecn-sane@lists.bufferbloat.net>,
	Cake List <cake@lists.bufferbloat.net>,
	Jonathan Morton via Bloat <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] [Cake] Anybody has contacts at Dropbox?
Date: Sun, 25 Jun 2023 02:04:00 +0300	[thread overview]
Message-ID: <46B3DF93-48F1-429C-B9E0-41683CBBE1E8@gmail.com> (raw)
In-Reply-To: <24D1A566-DFE9-4FDF-86A2-CFB30F20FCB2@gmx.de>

> On 25 Jun, 2023, at 12:00 am, Sebastian Moeller via Cake <cake@lists.bufferbloat.net> wrote:
> 
> Is dropbox silently already using an L4S-style CC for their TCP?

It should be possible to distinguish this by looking at the three-way handshake at the start of the connection.  This will show a different set of TCP flags and ECN field values depending on whether RFC-3168 or AccECN is being attempted.  Without AccECN, you won't have functioning L4S on a TCP stream.

But I think it is more likely that it's a misapplied DSCP.

 - Jonathan Morton

  reply	other threads:[~2023-06-24 23:04 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-06-24 21:00 [Bloat] " Sebastian Moeller
2023-06-24 23:04 ` Jonathan Morton [this message]
2023-06-25  8:43   ` [Bloat] [Cake] " Sebastian Moeller

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