From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752591AbXBDW46 (ORCPT ); Sun, 4 Feb 2007 17:56:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752594AbXBDW45 (ORCPT ); Sun, 4 Feb 2007 17:56:57 -0500 Received: from wx-out-0506.google.com ([66.249.82.233]:57419 "EHLO wx-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752592AbXBDW44 (ORCPT ); Sun, 4 Feb 2007 17:56:56 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=gxIt+cRoSqyJ3a8mnnQ9VNP+0m+vXWyhCRv7HWNZkyPKZq1hA9KNwpqn3kLAb/J3XUivb72CiobjZ+NO9p9ssnE803asH1kxtlQ0on5vupP1VscmHx4OOmT7oZNqA8qyJIElJ0bmXXsul9+klKTwZ4dcm893jakje9wcGsSOIJg= Message-ID: <82e4877d0702041456u5d30d32bs41233048a1833d59@mail.gmail.com> Date: Sun, 4 Feb 2007 17:56:55 -0500 From: "Parag Warudkar" To: netdev@vger.kernel.org Subject: Re: Unexpected Acknowledgement / Stalled Connections Cc: linux-kernel@vger.kernel.org In-Reply-To: <82e4877d0702041431p555e644et35845db674304403@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <82e4877d0702041431p555e644et35845db674304403@mail.gmail.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On 2/4/07, Parag Warudkar wrote: > I am running 2.6.20 and have trouble with stalled connections. For > instance, if I try to download a debian ISO image using wget, the > connection runs fine for few seconds and then stalls for ever. > > In my router logs I see a ton of messages like the below - > > [INFO] Sun Feb 04 17:22:03 2007 Blocked incoming TCP packet from > 192.168.0.174:34090 to 130.239.18.138:80 with unexpected > acknowledgement 3269301836 (expected 3269343453 to 3269408989) > > Where 192.168.0.174 is my laptop running FC6 and kernel 2.6.20 and > 130.239.18.138 is whatever cdimage.debian.org resolves to atm. > > What's going on here? Any TCP/IP tunable that I can set/turn on/off to > prevent this from happening? Turning tcp_sack off seems to cure it. Turning it on again makes the connections stall. Seems like the D-Link router doesn't like the SACKs linux sends? Parag