Ethereal-users: [Ethereal-users] Bad TCP checksums from local host?

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From: Mike Weber <ethereal@xxxxxxxxxxxxxxxx>
Date: Sun, 15 Aug 2004 07:33:32 -0400
I'm running ethereal 0.10.6 with winpcap 3.1 beta 3 under winXP with all the patches windows update wanted to install except service pack 2. I'm running an Athlon64 3400+ on an NVidia nForce3 250Gb - based motherboard.
While going through an analysis I noticed that probably ~90% of the segments generated from my machine are reported as having bad TCP checksums. There doesn't seem to be a problem transferring data; I've transferred gigabytes of data over this link over the last few days and haven't had trouble on a scale that correlates with the number of bad checksums I'm seeing. (I have had a problem where certain email message bodies never get ACK'd, but I don't know if that's a checksum problem or something else. It is the reason I broke out ethereal, though.)
Is this something to worry about? Is it a bug in winpcap or ethereal? Or is the checksumming code in my NVidia NForce3 chipset (does tcp/ip offloading) broken? 

Thanks for any information pointers or advice!

Regards,
Mike