@DJDAN You can't open all ports at once - you can use a DMZ to your PC IP address but that's risky in terms of your network security. Follow this guide on how to open the ports one by one. For DMZ...

@BabyPower Update your RE firmware to the latest release - TL-WA850RE(EU)_V7_1.0.13 Build 231115. After a successful update reboot the main router then reboot the RE. If the issue persists follow...

@Ddluckydd Most probably your modem router is with customized FW release specifically for Dimensione ISP. If that's the case the default credentials (admin/admin) won't work - contact Dimensione for...

@DJDAN Here: Just make sure that you have your public IP address on the Internet port of your VR2100 (otherwise this won't work for you):

@DJDAN Here you can refer the ports used by Call of Duty - <https>://support.activision.com/articles/ports-used-for-call-of-duty-games

@D3C0D3R This can be answered only by a TP-Lin representative - that's why I advised to continue interacting with your local support.