From mboxrd@z Thu Jan 1 00:00:00 1970 From: ROUTE 66 - Catalin BOIE Subject: Re: Strange TCP dump between a Linux and a Samsung phone Date: Wed, 12 Nov 2008 09:15:13 +0200 Message-ID: <491A8281.6040804@route66.ro> References: <4919910E.6080700@route66.ro> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Netdev To: =?UTF-8?B?77+9?= Return-path: Received: from mail.route66.ro ([91.201.80.3]:47349 "EHLO mail.route66.ro" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751077AbYKLHQI (ORCPT ); Wed, 12 Nov 2008 02:16:08 -0500 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: =EF=BF=BD wrote: > On Tue, 11 Nov 2008, ROUTE 66 - Catalin BOIE wrote: Hello! After upgrading to 2.6.26.?, the problem was fixed! Thank you very much for your super quick answer! >> I have captured a strange dump between a Linux kernel >> 2.6.25.6-55.fc9.x86_64 and a Samsung device. >=20 > Please upgrade or prove that the tcp fixes that were in the later ker= nel=20 > (.7 iirc or 2.6.26) got applied into that -55 part. >> I looked at it and it seems that the Linux stack does not send any >> retransmissions to Samsung device. >> But, I want a competent look from you. >> >> The connection is done over a 3G connection. >> The capture was done on a router between the two endpoints. >> c.66.com is the Linux machine, the other IP is the Samsung device. >=20 > ...snip... >=20 >> As you may see, the Samsung device keeps sending an ACK for 1261841 = and >> after some time closes the connection. >> Why the Linux stack does no retransmissions? >=20 > Looks like a know bug in frto which got fixed. >=20 > If upgrade is not an option, you can experiment by playing with tcp_f= rto=20 > sysctl (with 0 you should not encounter that bug). Thanks! --=20 Catalin BOIE ROUTE 66