From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf1-x136.google.com (mail-lf1-x136.google.com [IPv6:2a00:1450:4864:20::136]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 354CE3B29D; Sat, 24 Jun 2023 19:04:04 -0400 (EDT) Received: by mail-lf1-x136.google.com with SMTP id 2adb3069b0e04-4f76a0a19d4so2636741e87.2; Sat, 24 Jun 2023 16:04:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1687647842; x=1690239842; h=to:references:message-id:content-transfer-encoding:cc:date :in-reply-to:from:subject:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=EtOwEEvQ6wz0X40Hlx7wj8uuN+kJhmG1bLPL4UyA+eY=; b=CGhTHwYf71fSMdo76G776ec22TX7VL3/oIs4jENUhTqgcgNJp/QonqBndKuGclV8Lv AH4NiYPKLh9k1I5YW+w1SHkbu1KFzcb8uEh01U3ntCzHcMIakgugKr9wv8fQi2Oz0DsU +4mwFJzIvU0HimkXCzOmmVuN1oe73ZQca3KIQIcdy3tAlSinWBwHlf/8UVBqcORaDR0s RtTPHrEwInCDpqI5jBiQkS5fTdTFpl5UDSbIMOJKtE+v5lGr1CZGWV0LhU2/kgfhrj4A FypsxGZLMOb2gUwjldqE2pt4TS7tByQJmFbVUUIiC6DeKB2NOd2urkv+gf72rc5N6xcr Innw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687647842; x=1690239842; h=to:references:message-id:content-transfer-encoding:cc:date :in-reply-to:from:subject:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=EtOwEEvQ6wz0X40Hlx7wj8uuN+kJhmG1bLPL4UyA+eY=; b=Y3bCGAExXPQWk8ZlWlaAO3ejbloI7TwRhywT9L39+H2r1/+oHXR4xn2GbkQF8Wu4Ks UAX7k0IDvXcgKjHqcfnHrMiVBjFOPU8lwE+PmC4P19YFtdV2c3wDlJNzj4CdFiWGXhxU ADcpTSAvqaZzP0qblziXTBErjLaR5eBqIGs6O+iFDlHmYi3PaDsVXZkTnqdQDdymfkfG OZtBwTadTehOMDVQs5glrOTqNn4fEikbf74ZvxheLhXWvqh/FMqoxfIsf3EnCeSpRrY7 4jNxDsZnVd1UBTryeWxPl4i+koVW9JxwZtJg2WMAFWqT/5V9+VKY2my8wWWcMzPe+btc mtZw== X-Gm-Message-State: AC+VfDwfrDrLDfUsGSOZLmjHO+q6N6q019BmOjv1N4Ar9wJhnkMU5zHm 18gnjoW5XXMj88YzEjV1oWtRBRE6vTQ= X-Google-Smtp-Source: ACHHUZ6TbvjfIVw9fWs9WOwg5zZ1gT2GMnmCEgMe0yKD+yEql629JucnaRGs9itUwdW/lkpD6EC+DQ== X-Received: by 2002:a05:6512:1319:b0:4f8:6625:f2ca with SMTP id x25-20020a056512131900b004f86625f2camr6329823lfu.61.1687647841823; Sat, 24 Jun 2023 16:04:01 -0700 (PDT) Received: from smtpclient.apple (176-93-91-3.bb.dnainternet.fi. [176.93.91.3]) by smtp.gmail.com with ESMTPSA id w25-20020a19c519000000b004f85885cff1sm416130lfe.134.2023.06.24.16.04.01 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 24 Jun 2023 16:04:01 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.100.0.2.22\)) From: Jonathan Morton In-Reply-To: <24D1A566-DFE9-4FDF-86A2-CFB30F20FCB2@gmx.de> Date: Sun, 25 Jun 2023 02:04:00 +0300 Cc: ECN-Sane , Cake List , Jonathan Morton via Bloat Content-Transfer-Encoding: quoted-printable Message-Id: <46B3DF93-48F1-429C-B9E0-41683CBBE1E8@gmail.com> References: <24D1A566-DFE9-4FDF-86A2-CFB30F20FCB2@gmx.de> To: Sebastian Moeller X-Mailer: Apple Mail (2.3654.100.0.2.22) Subject: Re: [Bloat] [Cake] Anybody has contacts at Dropbox? X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 24 Jun 2023 23:04:04 -0000 > On 25 Jun, 2023, at 12:00 am, Sebastian Moeller via Cake = wrote: >=20 > 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=