netdev - Re: Multicast and hardware checksum

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Message-ID: <46693A3B.70202@ev-en.org>
Date:	Fri, 08 Jun 2007 14:15:07 +0300
From:	Baruch Even <baruch@...en.org>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	netdev@...r.kernel.org
Subject: Re: Multicast and hardware checksum

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.

Baruch
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