Thanks so much,martinLol you've had a wireless adaptor the whole time??
Of course you can - it's a network connection and works exactly the same. I do this with my slim RGH.
Did you try changing your subnet to 192.168.1.0?
Also, you said you tried both methods? If you manually changed the addresses as I suggested, you should have been able to FTP to the console's IP from the computer. If you couldn't, it's a cable issue.