From owner-freebsd-net@freebsd.org Fri Dec 28 06:37:31 2018 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id D4025142F0E1 for ; Fri, 28 Dec 2018 06:37:31 +0000 (UTC) (envelope-from m.muenz@spam-fetish.org) Received: from mailout-02.maxonline.de (mailout-02.maxonline.de [81.24.66.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id A835075523 for ; Fri, 28 Dec 2018 06:37:30 +0000 (UTC) (envelope-from m.muenz@spam-fetish.org) Received: from web03-01.max-it.de (web03-01.max-it.de [81.24.64.215]) by mailout-02.maxonline.de (Postfix) with ESMTPS id 629F5521 for ; Fri, 28 Dec 2018 07:37:21 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by web03-01.max-it.de (Postfix) with ESMTP id 512D928B84D for ; Fri, 28 Dec 2018 07:37:21 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at web03-01.max-it.de Received: from web03-01.max-it.de ([127.0.0.1]) by localhost (web03-01.max-it.de [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id rDt3lnYlMy6x for ; Fri, 28 Dec 2018 07:37:21 +0100 (CET) Received: from [81.24.66.132] (unknown [81.24.66.132]) (Authenticated sender: m.muenz@spam-fetish.org) by web03-01.max-it.de (Postfix) with ESMTPA id 21FB328A02D for ; Fri, 28 Dec 2018 07:37:21 +0100 (CET) Subject: Re: DUP ACKs sent with no reason To: freebsd-net@freebsd.org References: From: "Muenz, Michael" Message-ID: <74db0aae-3f93-aaa5-7241-8043ba0254bf@spam-fetish.org> Date: Fri, 28 Dec 2018 07:37:20 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.3.3 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: A835075523 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; spf=pass (mx1.freebsd.org: domain of m.muenz@spam-fetish.org designates 81.24.66.23 as permitted sender) smtp.mailfrom=m.muenz@spam-fetish.org X-Spamd-Result: default: False [-2.78 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_COUNT_FIVE(0.00)[5]; NEURAL_HAM_MEDIUM(-0.99)[-0.992,0]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:81.24.64.0/22]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-net@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.00)[-0.995,0]; RCVD_TLS_LAST(0.00)[]; MX_GOOD(-0.01)[rspamd.max-it.de]; NEURAL_HAM_SHORT(-0.22)[-0.216,0]; DMARC_NA(0.00)[spam-fetish.org]; IP_SCORE(-0.26)[ipnet: 81.24.64.0/20(-0.72), asn: 24764(-0.58), country: DE(-0.01)]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:24764, ipnet:81.24.64.0/20, country:DE]; MID_RHS_MATCH_FROM(0.00)[] X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 28 Dec 2018 06:37:32 -0000 Am 27.12.2018 um 19:32 schrieb Youssef GHORBAL: > > What can explain those DUP ACKs sent by the FreeBSD host? (DUP ACKs sent by the client are "normal" in a way to report missing packet loss and carry Selective ACKs, but those sent by the BSD stack are hard to explain) > > How can I push the investigation further ? > Hi, I had similar phenomenons with DUP ACKs, lost packets and also duplicate ICMP replies when using Intel X710 cards. Did you test exchanging hardware and trying Linux-only and/or BSD-only iperf to look for a difference? Best, Michael