From mboxrd@z Thu Jan 1 00:00:00 1970 From: Herbert Xu Subject: Re: incorrect cksum with tcp/udp on lo with 2.6.20/2.6.21/2.6.22 Date: Tue, 2 Oct 2007 18:40:33 +0800 Message-ID: <20071002104033.GA30281@gondor.apana.org.au> References: <20070924013005.GB22054@gondor.apana.org.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: netdev@vger.kernel.org To: Krzysztof Oledzki Return-path: Received: from rhun.apana.org.au ([64.62.148.172]:1400 "EHLO arnor.apana.org.au" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751861AbXJBKkq (ORCPT ); Tue, 2 Oct 2007 06:40:46 -0400 Content-Disposition: inline In-Reply-To: Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Mon, Sep 24, 2007 at 11:44:19AM +0200, Krzysztof Oledzki wrote: > > So, with DR mode, packet goes by the lo device (with bad checksum) and > then get redirected outside. Unfortunately, when it leaves host it has bad > checksum, too. :( Did you check this by taking a tcpdump on an external host? Doing a local tcpdump doesn't work as tcpdump won't show the correct checksum if checksum offload is enabled. If it's really sending a bogus checksum then it's a bug in LVS. Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt