Hi guys,  I am also new to setting up these antminers .took me ages to set them up. So i will try and help you out. You might have done this already, But worth a try .
Ok i am assuming that your using windows. So start bar control. Panel. Networks. Change adapter settings. Right click local area connection. Then properties.
Go down to where it says internet protocol version 4. Click on the box for use the following ip address.  For ip address. Enter 192.168.1.1 subnet mask 255.255.255.0
Default gateway 192.168.1.100..then click ok .connect your pc or laptop too the miner using your RG45 Cable.open. a browser and type 192.168.1.99 You should get into the miner. After you set your miner up mind and reverse the adapter settings in your network adapter setting the ones that you changed.
Like i said you might have done this already .but i used ip scanner and all that, till i did it that way.good luck hope it helps .