From mboxrd@z Thu Jan 1 00:00:00 1970 From: Baruch Even Subject: Re: Multicast and hardware checksum Date: Fri, 08 Jun 2007 14:33:07 +0300 Message-ID: <46693E73.3030707@ev-en.org> References: <46693743.7090100@ev-en.org> <20070608110621.GA23842@gondor.apana.org.au> <46693A3B.70202@ev-en.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org To: Herbert Xu Return-path: Received: from rrcs-24-123-59-149.central.biz.rr.com ([24.123.59.149]:20142 "EHLO galon.ev-en.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S968933AbXFHLds (ORCPT ); Fri, 8 Jun 2007 07:33:48 -0400 In-Reply-To: <46693A3B.70202@ev-en.org> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Baruch Even wrote: > Herbert Xu wrote: >> On Fri, Jun 08, 2007 at 02:02:27PM +0300, Baruch Even wrote: >>> As far as IGMP and multicast handling everything works, the packets >>> are even forwarded over the ppp links but they arrive to the client >>> with a bad checksum. I don't have the trace in front of me but I >>> believe it was the UDP checksum that failed. >> >> What kind of a ppp device is this? >> >> If you run a tcpdump either side of the ppp link do you see the same >> UDP checksum value? > > This is a pptp link. I've checked the checksum on the receive side, I > don't know on the sender side and I'll only be able to try it on Sunday. For completeness, the clients are Windows XP clients and the server is a Linux machine. The tunnel is mppe encrypted so I believe that what goes out on the client is the same as what got in on the server. Baruch