ip_fast_csum fails ???

[un23@rz.uni-karlsruhe.de (Alexander Schulz)]

Hello,

Can anybody give me a hint why ip_fast_csum always fails on incoming packets
on the shark (strongarm)? It gives c7ff or feff where it should return 0.
It works on outgoing packets though. I dumped the packets to the terminal
and they are received ok. When I do a checksum with 16-Bit values it works.

Any ideas what is going wrong here?

Thanks
   Alexander