The ip address you're getting should be one it's pulling via dhcp. Just to be sure, you can reset the stoker to make sure it's using dhcp by changing the first set of numbers in your ip addy to 255 on the stoker and then hit select. The stoker will reset to dhcp and pull down a new ip, you may have to restart the stoker, but at that point you know you're using dhcp.
I've got no idea why you're not able to access the setup screen, you should be able to if you're seeing an ip addy. When my stoker doesn't get an ip address via dhcp I see all zeros. (000.000.000.000). You may have to call Rocks.
Big Steel Keg, WSM, OTG, PBC, Super Fast and Accurate Blue Splash-Proof Thermapen