Hi Mike,
cat 5 or 6 should not make any difference, i use cat5e cables in my 1GBit Network.
Tell me more about your network, which router, ip configuration?
My Router is 192.168.178.1, the TP-Link Nano Router in client mode is connected to the router at adress 192.168.178.31.
The Z3200 is connected to the Nano Router, take a look at the screenshot of the network config from my Z3200, the ip adress is 192.168.178.50
This settings works fine, look at the screenshots, i hope it helps you.
My Router WLAN Settings:
Z3200 network settings:
HP Utility:
The TP Link Nano Router Settings:
Greetings from germany,
Matthias