From owner-freebsd-net@FreeBSD.ORG Wed Dec 27 05:55:48 2006 Return-Path: X-Original-To: freebsd-net@freebsd.org Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 6B1D316A407 for ; Wed, 27 Dec 2006 05:55:48 +0000 (UTC) (envelope-from stephanwehner@gmail.com) Received: from nf-out-0910.google.com (nf-out-0910.google.com [64.233.182.184]) by mx1.freebsd.org (Postfix) with ESMTP id 080D813C463 for ; Wed, 27 Dec 2006 05:55:47 +0000 (UTC) (envelope-from stephanwehner@gmail.com) Received: by nf-out-0910.google.com with SMTP id p48so4492655nfa for ; Tue, 26 Dec 2006 21:55:46 -0800 (PST) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=OYEaIpwmbgfz0LlEtMgqYNLuMA8gVVRwo3bAvF0giI5s/ES6M7A36Lrga63cE/OFyGlM4+ahEhAoMlBdFo4rpgcpOnhbxFNWWyjEigFUVPQara8ViYN4cBgvu6ZoF1aJwflaQygycheqfP50mMeUZQlrSloKKWR08gDOuroWTVM= Received: by 10.78.185.16 with SMTP id i16mr3506399huf.1167198946825; Tue, 26 Dec 2006 21:55:46 -0800 (PST) Received: by 10.78.142.3 with HTTP; Tue, 26 Dec 2006 21:55:46 -0800 (PST) Message-ID: Date: Tue, 26 Dec 2006 21:55:46 -0800 From: "Stephan Wehner" To: alex@pilosoft.com In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: Cc: freebsd-net@freebsd.org Subject: Re: Diagnose co-location networking problem X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 27 Dec 2006 05:55:48 -0000 Ok, thanks, I now ran tcpdump with -n. Here I am testing with a little script that continuously accesses one of the pages. Right at the beginning it doesn't get very far: first response after 90 seconds. What kind of DNS problem did you have in mind? Stephan $ sudo /usr/sbin/tcpdump -n host stbgo.org Password: tcpdump: listening on eth0 21:40:22.162536 192.168.2.54.35932 > 65.110.18.138.80: S 1526509984:1526509984(0) win 5840 (DF) 21:40:25.160150 192.168.2.54.35932 > 65.110.18.138.80: S 1526509984:1526509984(0) win 5840 (DF) 21:40:31.160150 192.168.2.54.35932 > 65.110.18.138.80: S 1526509984:1526509984(0) win 5840 (DF) 21:40:43.160143 192.168.2.54.35932 > 65.110.18.138.80: S 1526509984:1526509984(0) win 5840 (DF) 21:41:07.160149 192.168.2.54.35932 > 65.110.18.138.80: S 1526509984:1526509984(0) win 5840 (DF) 21:41:55.160152 192.168.2.54.35932 > 65.110.18.138.80: S 1526509984:1526509984(0) win 5840 (DF) 21:41:55.174033 65.110.18.138.80 > 192.168.2.54.35932: S 432853648:432853648(0) ack 1526509985 win 65535 (DF) 21:41:55.174139 192.168.2.54.35932 > 65.110.18.138.80: . ack 1 win 5840 (DF) 21:41:55.175738 192.168.2.54.35932 > 65.110.18.138.80: P 1:15(14) ack 1 win 5840 ( DF) 21:41:55.290528 65.110.18.138.80 > 192.168.2.54.35932: . ack 15 win 33304 (DF) 21:41:55.290665 192.168.2.54.35932 > 65.110.18.138.80: P 15:73(58) ack 1 win 5840 (DF) On 12/26/06, alex@pilosoft.com wrote: > On Tue, 26 Dec 2006, Stephan Wehner wrote: > > > Most of the times I find the server responds nicely. But periodically it > > doesn't respond properly when accessing its webpages: Type URL in > > browser, hit return, no page appears. Try again and again and after a > > few times it appears. > DNS. > > try tcpdump -n > > -alex > > -- Stephan Wehner > http://stephan.sugarmotor.org > http://stephansmap.org > http://www.trafficlife.com > http://www.buckmaster.ca