In Ignition, if using later versions of Emulate, you don't need to do anything different. Use the same Logix driver (enter an IP and slot #). Run a CMD and ipconfig on the image/host running Emulate. This is the IP address you will enter into Ignition. That's it.
If you have later versions, Windows 10, etc., it will just work. I haven't spent time figuring out why... honestly I really didn't care. I was just glad it did.
Edit, another post discussing this as well.
At first it didn't work for me, as I was using Windows 7. One of the post links a walkthrough.