Hi, I'm using a netgear ethernet router with powermac and since it has a wifi option, I connected a netgear access point to my Peg2 so to have a wireless connection working on it.
Now If I have understood correctly the problem is in your switch ethernet (wich receive signal from ethernet adapter): you wrote you can access to switch setup page and you set it as client and that is correct. Did you checked if it has the dhcp disabled?