From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf1-x129.google.com (mail-lf1-x129.google.com [IPv6:2a00:1450:4864:20::129]) (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 425F23B2A4; Sun, 3 Sep 2023 18:36:07 -0400 (EDT) Received: by mail-lf1-x129.google.com with SMTP id 2adb3069b0e04-4ff9b389677so1326331e87.3; Sun, 03 Sep 2023 15:36:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1693780566; x=1694385366; darn=lists.bufferbloat.net; 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=4rcSBqgbPs70Td03eIyVuCbPyR51WiY9uWSAobf/Y+U=; b=R+kytCRnieujOCZTVw9qDyMF7VA89MCPhxzabUI1Oq/XRItzHyPnb5Y9mdYB8iqtOf oKvsaj0bo5Ny7E64iR6Qb+yOcM6h/EivVTzlUk8CtcxmP6GuW0PxQI9Xhe4PROFA2DI5 HRBTbn/SXr3+wf+qaY8aaz10ZCXqaEceo/1CxJpK/NUfqkdYb1r1LuYXXYgULldD4vv+ 2nmhpuab3KO8JP+szB1rkj+WQ5F+RLnQKLs4bMnnpINPuiS9P6zHvbAX0IDaKpOEmdMI O+XE5WzwZh0Xa5WBYJpr4JybEN9ajIJKFjGmTjN+Ef+lH57XJ2KzZJSqTw/XzEgsRmcN 9D6Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1693780566; x=1694385366; 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=4rcSBqgbPs70Td03eIyVuCbPyR51WiY9uWSAobf/Y+U=; b=J8PBOFvkDkJ2Nf+LWsNW/0xMhaJf2yZS5AaOmJiGqq4eTEfe14VAkD/rVrLbEdVg1o VaINVWTidI7pP1hX1eSa2hJlYtz5GzUEvhfBRXdLyWCPXKbJZLi2xXqo4XQVth4ecCP1 1FuvtFTaPYkRXEylS9Uz12VMkGv9U5ntbbiKTqMJ2hbFZdvKSA7mJhcGhAIZWz0rGgLy Jh7U2ASW9FPjHErqDnOx+/kfOngD5TBRqnpA5lOWwnfWmK5G4u/B3c1rCQN1SZpbvzrn 8CwgyVokQrU4X2zm9TeGCKmMzGuTW3JyzuAYbA4dbl08qsSeB9VhFbAUOxe6z9bKKmr7 UjEQ== X-Gm-Message-State: AOJu0YwQThuqT32KoEjPSOhMNm9bawv6QzrONQtS97XsbliI9OECvPXj JP0Ec4FIjirxE3QPOxqdRgE= X-Google-Smtp-Source: AGHT+IHSp7UySgH/JvtkJgsIv55UX5PN5hBZtPeV52L9a5fmqAG65oZ1PyX4a906oPgF6f7gU2R9FQ== X-Received: by 2002:a05:6512:1cf:b0:500:7e12:c48b with SMTP id f15-20020a05651201cf00b005007e12c48bmr4845685lfp.44.1693780565383; Sun, 03 Sep 2023 15:36:05 -0700 (PDT) Received: from smtpclient.apple (178-55-83-36.bb.dnainternet.fi. [178.55.83.36]) by smtp.gmail.com with ESMTPSA id h23-20020a197017000000b004faa2de9877sm1429329lfc.286.2023.09.03.15.36.04 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 03 Sep 2023 15:36:04 -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: <758B6681-14B5-473E-9706-45B7E2927505@gmx.de> Date: Mon, 4 Sep 2023 01:36:03 +0300 Cc: bloat , ECN-Sane Content-Transfer-Encoding: quoted-printable Message-Id: <49DF744B-E60F-47CA-AF57-F2C5D42B9244@gmail.com> References: <758B6681-14B5-473E-9706-45B7E2927505@gmx.de> To: Sebastian Moeller X-Mailer: Apple Mail (2.3654.100.0.2.22) Subject: Re: [Bloat] [Ecn-sane] The curious case of "cursed-ECN" steam downloads 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: Sun, 03 Sep 2023 22:36:07 -0000 > On 3 Sep, 2023, at 9:54 pm, Sebastian Moeller via Ecn-sane = wrote: >=20 > B) Excessive ECT(1) marking (this happened with a multi-GB download) This *could* be a badly configured middlebox attempting to apply a DSCP, = but clobbering the entire TOS byte instead of the (left justified) DSCP = field. Apparently Comcast just found a whole raft of these in their own = network as part of rolling out L4S support. Funny how they didn't = notice them previously. - Jonathan Morton=