From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qc0-x229.google.com (mail-qc0-x229.google.com [IPv6:2607:f8b0:400d:c01::229]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 74F6B21F3E0; Thu, 5 Mar 2015 11:50:40 -0800 (PST) Received: by qcwb13 with SMTP id b13so7626895qcw.9; Thu, 05 Mar 2015 11:50:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=content-type:mime-version:subject:from:in-reply-to:date:cc :message-id:references:to; bh=O7oMU/TP4UBtHeAg3hFySYfC7eIJG8RtcNAphftvH38=; b=YHvVolK7wj1V6Logqu1f11efTqNI2bO59seeIB1iruaH6zsDsbmiZByPDtmtVt6Xbt jBoDReMCiOxPvyWvFL+Pl0t8gYPpdl5KkH8pg5L0nz2xqKHNHHKMQ2+oMrldwSjLlPqD i4OkD0x9FUNafIJA5g3B/S/neP5NskZxdPxssAQaw7uubgGm2nM3oAmF/2uofU5zSV52 ZcPdJ3STplVggvoRfv6HugE9W1NV2nWnTy1KYx0i0jJC9dtcIKT2pUZWDYvjGT1UVVLl S1FVKFx/8J2aWP8DO4inQwwTYwjqOI930+mK4fFrrla3N5tqliupLilBYSWDcLAE1H3x t9KQ== X-Received: by 10.140.150.149 with SMTP id 143mr15446850qhw.4.1425585039044; Thu, 05 Mar 2015 11:50:39 -0800 (PST) Received: from richs-mbp-10219.home.lan (pool-71-173-64-230.ptldme.east.myfairpoint.net. [71.173.64.230]) by mx.google.com with ESMTPSA id x204sm1943403qha.2.2015.03.05.11.50.37 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 05 Mar 2015 11:50:37 -0800 (PST) Content-Type: multipart/signed; boundary="Apple-Mail=_1A465E41-4DC1-487C-9A60-CAD368D0057E"; protocol="application/pgp-signature"; micalg=pgp-sha512 Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) From: Rich Brown In-Reply-To: <201503051856.t25IuXok099060@maildrop31.somerville.occnc.com> Date: Thu, 5 Mar 2015 14:50:33 -0500 Message-Id: <3848591E-AB46-4E5C-BCC5-E3310D006C1A@gmail.com> References: <201503051856.t25IuXok099060@maildrop31.somerville.occnc.com> To: curtis@ipv6.occnc.com X-Mailer: Apple Mail (2.1878.6) Cc: "aqm@ietf.org" , "cerowrt-devel@lists.bufferbloat.net" , bloat Subject: Re: [Cerowrt-devel] [Bloat] [aqm] ping loss "considered harmful" X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Mar 2015 19:51:08 -0000 --Apple-Mail=_1A465E41-4DC1-487C-9A60-CAD368D0057E Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On Mar 5, 2015, at 1:56 PM, Curtis Villamizar = wrote: > In message = > Dave Taht writes: >=20 >> My point was A), I have seen tons of shapers out there that actually >> prioritize ping over other traffic. I figure everyone here will agree >> that is a terrible practice, but I can certainly say it exists, as it >> is a dumb mistake replicated in tons of shapers I have seen... that >> makes people in marketing happy. >>=20 >> Already put up extensive commentary on that bit of foolishness on >> "wondershaper must die". >=20 >=20 > Its possible to detect such a shaper prioritizing ICMP echo/reply by > doing a an HTTP fetch concurrent with a ping...=20 For an easy (but imprecise) way test the HTTP response times, try Blip - = http://gfblip.appspot.com/ (or read about it on github: = https://github.com/apenwarr/blip) Blip sends short http requests to a = couple hosts and measures the response time of the error pages.=20 > and then and see if the > TCP data packet get significantly delayed relative to the ICMP echo > and echo reply packets. You'd have to do a tcpdump and match the ICMP > echo to the echo reply and see if later the ICMP RTT looks very > different from the TCP RTT. It might be that the SYN and SYN ACK are > not delayed but the plain old TCP date packets are. >=20 > If anyone has a small amount of spare time and wants to put together a > shell script its certainly doable. >=20 > Curtis > _______________________________________________ > Bloat mailing list > Bloat@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/bloat --Apple-Mail=_1A465E41-4DC1-487C-9A60-CAD368D0057E Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQEcBAEBCgAGBQJU+LOKAAoJEH4agC/0z73/ayMH/jzLhCICsS25P8d6MFPC1P/Y cl9+f1cXDzue0Eiu5ENUPnzMx8MA1W1KYXLM4U199CJYuXTOjFbrC25JY0aH+yOh F+KZfvE0+G3b8FMR9M7WtTe6FrqJhWOU9Z7eRgARXmSdm8+zLm85JDMO6VwkFJB4 ZrRpuiS3b8MIl5cXPGYuI4hjf22A4YM0DWlY243o162uitUfwT0CVk+jAJu42u3d rg0+GiRfq2Ga+ufJDShLmEY8yjyApf1JGMqE4Jursb2Wxmzi0HmIocsNelF0s7OX Wi1q9iyTAdXFS39+vCoLi9xlv5hyQfSSuclTqKqfRNkVFlOvldg5hQTcNLMYfeQ= =qEL8 -----END PGP SIGNATURE----- --Apple-Mail=_1A465E41-4DC1-487C-9A60-CAD368D0057E--