Migration assistant with Time capsule through ethernet. TC is not a base station but a network hard drive.

Hi, I set up my time capsule as a hard drive in the network. It is not the base station of the network (we have another router). I can access the TC wirelessly but can I access it through the ethernet. I tried to do so but I could not, I need to use the migration assitant because I backed up all my files to the TC. However, when I let the migration assitant look for the TC while the wifi is off it can not find it. When i go to the Ethernet preferances (even though wifi is off). it says connected and it gives me an IP address!