...and I found the manual to be a bit confusing about this address business as well when I was setting up my UC300ETH. I found out by pinging the IP address from the Windows machine and finding 10.10.10,10 already out there. Good news is that it's been absolutely solid ever since I got it right! Once you know what the problem is, you can read the manual and see that it is correct. It's just that that's not how you read it first time through...