On Tue, Jul 24, 2007 at 09:31:37PM +0200, 6bone@6bone.informatik.uni-leipzig.de wrote:
> I think the problem only occurs with outgoing packets.

This is expected - the checksum is filled in later by the hardware and left
0 in the software stack. The adapter fixes the packet before it goes out
on the wire. If you tcpdump on a neighbour machine, you should see correct
checksums.

Martin