From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?B?IlRob21hcyBCLiBSw7xja2VyIg==?= Subject: Re: UDP checksum broken since 2.6.18? Date: Tue, 22 May 2007 23:33:30 +0000 Message-ID: <46537DCA.7060603@openpma.org> References: <465364EA.3020100@openpma.org> <20070522161217.20875c39@freepuppy> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit To: Stephen Hemminger , =?UTF-8?B?UGhpbGk=?= =?UTF-8?B?cHAgR8O8aHJpbmc=?= , netdev@vger.kernel.org Return-path: Received: from vpn-da.werderstrasse.de ([217.195.43.101]:57007 "EHLO dk0td.afthd.tu-darmstadt.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756104AbXEVXdc (ORCPT ); Tue, 22 May 2007 19:33:32 -0400 In-Reply-To: <20070522161217.20875c39@freepuppy> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Stephen Hemminger wrote: > The packet passed to packet capture programs may not have a valid checksum > if you have checksum offload configured on the device. What kind of hardware > do you have on sender and receiver? The c-snippet uses 127.x.x.x --> loopback I think Philipp tested this on real NICs too. I just proxied this information to this list because I don't have the indepth knowledge about IP, UDP and the kernel. I had a Chat with Ralf Baechle and he recommended sending a report to netdev@. Maybe Philipp can give some more information. He discovered this. Cheers Thomas