The network connection are based on MAC address and IP address.So I think the modem will not send the PC name to ISP. Do you meet some problem on this?

You can check DHCP it will show all the clients connect to the router.You can check the data using in statistics.And there's bandwidth control function,you can limit the bandwidth there.

The internal port and external port are both 1025,right?If you have done this settings,it should work.Are you choosing the correct Use Interface?

You can use the WDS Bridging function.Refer to http://www.tp-link.com/en/faq-327.html.

The destination market of VR200v is Germany.It will not sold in other countries so the country is locked for Germany.You can try to set the same channel and channel width and check if it will work as...

It's better to use the original antenna because it's designed for the device.If you want to get better wireless signal,you can try to change the wireless channel.If your device support 5GHz Wifi,you...