From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.gmx.net (mout.gmx.net [212.227.15.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id B911C3B2A4; Mon, 4 Sep 2023 03:14:27 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.de; s=s31663417; t=1693811666; x=1694416466; i=moeller0@gmx.de; bh=i5RCqe5KzK4Jx2J9+z4gukYbuq3l/yj1Oci2TCd5sP4=; h=X-UI-Sender-Class:Date:From:To:CC:Subject:In-Reply-To:References; b=Vtj+nnriNS3EnBdNVh+ChRe7IaGsEgd6WgCUZhZur5HLC41G5diSVoZQv0SeyNFtxOtcMWb LBAuUS7lKnlqdgMEl+2G5Sye8x0S3+fYZkLrLiEJOYSiMcYVO1PYCNg+F9CFzsPsmWt/UV1kM 1jgIzrrgWlkv5MnTM4qX0I119pZ2bePpYX3pncX22H6jPcwksZ0IftafETJ40Wfov1wgZKajT 3Y/+8tf7yf8mmB7TlN04yVNTCLrTn3BKGZqJSVIbfPiUpEO/sOgbcl9s8htnUI+cuDy0e/pLY kzei/RhQpPW2SMgUqDI3siujhkiuWz6ylPuoBNLdKORsxb7yHNQA== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from [127.0.0.1] ([134.76.241.253]) by mail.gmx.net (mrgmx005 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MIdeR-1qOXbA3DbZ-00Ea8F; Mon, 04 Sep 2023 09:14:25 +0200 Date: Mon, 04 Sep 2023 09:14:21 +0200 From: Sebastian Moeller To: Jonathan Morton CC: bloat , ECN-Sane User-Agent: K-9 Mail for Android In-Reply-To: <49DF744B-E60F-47CA-AF57-F2C5D42B9244@gmail.com> References: <758B6681-14B5-473E-9706-45B7E2927505@gmx.de> <49DF744B-E60F-47CA-AF57-F2C5D42B9244@gmail.com> Message-ID: <8AE33E95-311F-4F9A-8940-D92F2556F661@gmx.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:0EiugpuJ3bIbhWOWUAIjwFKnpQ/bfxpvBk5Y+F+5IgS4gRGw8uR E3qo4CeFU1HXjS4+fdR0vhO3PBOePWF9AXma4CYL8yaWc3UrY6SDujVjKmLNC79+3Ho5V1K 76J/rthHcOGg9g2Rw1GruoVkiRtjkqV9+G/wyGCIWC3WTnDHdku8ZsjMV65ue7nMyKk0kpZ QReVRoLQnYJmtMSnhk9jA== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:oNS2uLY/AbU=;+fmBnDxBi6y6Wy+crFvsXVqiM+2 9coXUJofpPcJ9tZbJMBtmHBg9WU8DcUwd9K+vymIM+5XzFj/knRjtEBLHSTamYT8FWUptmZXC 7L4bLvFmBnPILeZreUWIB8WEn4W/fQP3EwCxnG+W3g2vsp3LZTfaWxuxCVcGVJ1Ut7BVgQZ00 au1zHA64R+OHAXRy5G3RCYOqxaJutee285kvIxaj/Bo6CLcXmsLOVgAm47H6lJcyMtlupHmZQ FOP6V8yhXTsUDhboVGenkjk0IHwdZDOrJ1fg7YyBBs8c7lrW6oAleWaK+W+CRVOGkTG//+OZ/ tR2Q2K3RSERSrXLvuzQdJSGUDKyO55fIAVut3BvdjleFO5QRohVKNiBdMOKfyncMG76UOeBvI Tc3HefswKdQw/xBdfS+FyPUZZXmMWThHV9pvgfsj7KFCV4GcSRb0jXkV7Xe92nPuzuvs0bopP hZw9C3gtv0mPSxoXRTcb4e8wxTz3v8bdSHH3VOOzpVZUYWXv9702kf5kJXUvLNcTpTiJ8e9tO 6ZdJdbXAMmK/EaBXqioKIk4e4KZm6JxiGBlSk+GhwCplFofT/Ydxz781ER3R5N4igIIuQ3asC tVI7OXxZDKZ2tGhOooYgpeGztejPgXwk3kXdrsWJpzgrnIU8eGsspyhJpfk2k36bUc894Dhel layxFWn1nEIuB/6DdPDkMQVHDDwy6a7sopHfHLmMZ1RjDhrwdYQoQxHBoUUC1H4j06sYnrTFC vt72qTmtnoIXUSKsTHtyu+d+6GISgr9MRGFP1xDNElhEzydWlSnW8tAWMw82NmEajy2s45KiT h2eFGxGBvwUoptRNv73pQY7sxyDJmgN2kf+YLqLde3UxQ3H7wYtrwjrNvbfrlSpTo7UpzQtJu LlFpNxVG2qdDNSmsNSzfKsPcEHYqWA7CuVN5t+aS9vQv/YiKD6PhGgp9lqZGW+gt3LIJmHAC2 2JPldXAIgTohRZdl9sRHmS9SRFI= 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: Mon, 04 Sep 2023 07:14:28 -0000 Hi Jonathan On 4 September 2023 00:36:03 CEST, Jonathan Morton wrote: >> 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 fie= ld=2E =20 [SM] Mmmh, would that likely be DSCP decimal 1, aka LE? Or someone mapping= e=2Eg=2E a 3bit VLAN priority PCP directly onto the TOS field? What puzzle= s me is that from the same IPv6 I got one more data flow, 182 MB using ECT(= 0) and ECN=2E=2E=2E odd=2E=2E=2E >Apparently Comcast just found a whole raft of these in their own network = as part of rolling out L4S support=2E Funny how they didn't notice them pr= eviously=2E [SM] In retrospect re-dedicating bits out of an already used header field = might have been a bit optimistic=2E=2E=2E=2E Regards Sebastian > > - Jonathan Morton --=20 Sent from my Android device with K-9 Mail=2E Please excuse my brevity=2E