From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Hemminger Subject: Re: Fwd: Problem accessing a Certain Remote IP with Kernel 2.6.24-rc1 Date: Sat, 3 Nov 2007 16:38:18 -0700 Message-ID: <20071103163819.1b038db0@freepuppy.rosehill> References: <200711032231.56777.shlomif@iglu.org.il> <1855FBA6-5EFE-46E2-A334-AB31C5EDC404@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, shlomif@iglu.org.il To: Sparkletone Return-path: Received: from smtp2.linux-foundation.org ([207.189.120.14]:52405 "EHLO smtp2.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757975AbXKCXjz (ORCPT ); Sat, 3 Nov 2007 19:39:55 -0400 In-Reply-To: <1855FBA6-5EFE-46E2-A334-AB31C5EDC404@gmail.com> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Sat, 3 Nov 2007 15:34:18 -0500 Sparkletone wrote: > Forwarding this for someone who was getting bounces for some reason. > > Begin forwarded message: > > > From: Shlomi Fish > > Date: November 3, 2007 3:31:56 PM CDT > > To: sparkletone@gmail.com > > Subject: Problem accessing a Certain Remote IP with Kernel 2.6.24-rc1 > > > > Hi all! > > > > I hope this mail gets through because last time I checked, I got > > bounces > > whenever I tried to send email to LKML ("not liked source" for mail). > > > > I've been having a problem with kernel 2.6.24-rc1 on Mandriva > > Cooker. The > > problem is that after using it for a while connecting through TCP to > > the > > following remote, Internet IP - 212.143.218.31 - takes a very long > > time. > > > > Here's what I've learned: > > > > 1. Kernel 2.6.23 seem to exhibit this problem tooa fter a while. > > > > 2. It already happened twice with kernel 2.6.24-rc1. > > > > 3. A different computer on the same Home LAN connected via a NAT/ > > router has no > > problem with that IP. (At the same time, the Linux computer exhibits > > the > > problematic behaviour). > > > > 4. I could connect using telnet to port 80 eventually, but it took > > an awfully > > long time. > > > > 5. I have problem with both HTTP to port 80 and POP. > > > > 6. Restarting the network ("/etc/init.d/network restart") does not > > help - only > > a reboot. > > > > 7. The network as a whole (Google, etc.) works fine. > > > > I need this IP, because it hosts my POP account and my homepage. > > > > Per Rik van Riel's advice I prepared Ethereal (libpcap) dumps of the > > conversations before ("good") and after ("bad") the problem surfaced: > > > > http://freehackers.org/~shlomif/files/files/www.sf.org-conn-problem/ > > > > I'd appreciate if anyone would be able to shed more light on this > > problem and > > hopefully fix it. Please let me know if there's anything else you > > need. Sounds like another instance of the default window scaling causing problems. Look up TCP window scaling on lwn.net. There is almost some stupid middlebox/firewall that doesn't handle window scaling properly. -- Stephen Hemminger