The power line utility is not working with Windows 8 but all the power line adapter can work on Windows8 because the power line units are plug and play. Even though the utility can only work on your...

Actually, when the wdr3600 is working as a router, all the ports are blocked inside the network. Which means, your network information is invisible from Internet. I did not get the clear purpose...

Yes. they are.

You can use TL-WAP281 together with TL-PA211. However, TL-WPA281 is a separate WIFI device from the main router to supply the signal to end clients. However, it needs to talk to the main PA211...

I think you have a look at the light on TP-LINK. Are the second lights on all TP-LINK bright green? Use the TP-LINK Utility(CD software) to reset all the devices

They are compatible with each other. 200Mbps are compatible with 200mbps and 500 Mbps