>  > 
>  > doesn't ethernet has it's own layer-2 checksumming?
> 
> Sure, but there are plenty of cheap hubs/switches that screw it up in
> a way that makes a corrupted/packet appear OK.

hmm.. i did not know that.. anyway when one know/tested he has good
hardware it could be usable.
if hardware checksumming is implemented it should be easy by treating this
card as hardware-checksum capable but with null function