I'm attaching a small program I wrote to test the 'send custom fcs' patches. You can also test the rx-fcs and rx-all logic by making sure that the NIC properly handles the packets with bad FCS. For those that might have seen a previous version of this, I added the ability to specify the dest mac address which means you don't have to put the receiving NIC into PROMISC mode now. Thanks, Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com