From owner-freebsd-questions@FreeBSD.ORG Mon Nov 28 13:15:49 2011 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D7C3E106564A for ; Mon, 28 Nov 2011 13:15:49 +0000 (UTC) (envelope-from kjkoster@gmail.com) Received: from mail-ey0-f182.google.com (mail-ey0-f182.google.com [209.85.215.182]) by mx1.freebsd.org (Postfix) with ESMTP id 6A0B98FC16 for ; Mon, 28 Nov 2011 13:15:49 +0000 (UTC) Received: by eaai12 with SMTP id i12so2703866eaa.13 for ; Mon, 28 Nov 2011 05:15:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=from:content-type:content-transfer-encoding:subject:date:message-id :to:mime-version:x-mailer; bh=gV1g6Eza4FDxoCAw5xTp4QZI3qYTcBIL9OUj8B1QIfk=; b=mw+g07fkf98nbNpQVbenojTVt9h7byqCK3z8F5Lj1B1/s+H+24PPV2x/Mnap4n4fe/ OhmOWV/AMtIEPpGilswdpf0ecxQuSqyb6r0EwZyAHinmCbOh0utFouPF5nUO16o6RCVA yBFNJRDt3a+4HYyXMXEjXbKiDfdKBloCLdkro= Received: by 10.180.109.83 with SMTP id hq19mr43966029wib.54.1322486148278; Mon, 28 Nov 2011 05:15:48 -0800 (PST) Received: from macbookpro.fritz.box (kjkoster.org. [83.163.197.206]) by mx.google.com with ESMTPS id gf10sm14498740wib.2.2011.11.28.05.15.45 (version=TLSv1/SSLv3 cipher=OTHER); Mon, 28 Nov 2011 05:15:47 -0800 (PST) From: Kees Jan Koster Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Date: Mon, 28 Nov 2011 14:15:44 +0100 Message-Id: <609D354C-18C6-4E12-A57D-2426D9AE8B44@gmail.com> To: freebsd-questions@freebsd.org Mime-Version: 1.0 (Apple Message framework v1251.1) X-Mailer: Apple Mail (2.1251.1) Subject: diagnosing packetloss: x-files edition X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Nov 2011 13:15:49 -0000 Guys, The packet loss I asked about earlier is getting weirder and weirder. I = managed to track this down to being between two specific hosts = exclusively. When I run mtr from saffron to cumin I get packet loss reported on all = intermediate routers. When I run mtr from cumin to saffron I get packet = loss reported only on the end hop to saffron.=20 But (and here it gets weird) when I run mtr from saffron to any other = host on the Internet (although I have not tried exhaustively) I get *no* = packet loss at all. So what I expect now is that this is a hardware issue with the NIC in = Saffron that only affects the traffic going to cumin and not traffic to = any other host. I will swap the NIC in saffron, but I just wanted to check: * can this be caused by the fact that I use fwd rules in ipfw? Both = Saffron and Cumin have such rule. * Can this be caused by IP aliassing? With Saffron and cumin use two IP = addresses on their NIC. * Anything else? -- Kees Jan http://java-monitor.com/ kjkoster@kjkoster.org +31651838192 I hate unit tests; I much prefer the illusion that there are no errors = in my code. -- = Hendrik Muller