@bonestaak Your Pi hole DNS IP address can be set here:

@Leray22222 Your question can be answered only by a TP-Link representative. This option is matter of a FW implementation and I'm not sure that even they have that answer.

@Tmaz Contact your local support and let them advise you on this issue.

@jra11500 Well, that's worth a try to avoid the double NAT - thanks for the effort testing this topology.

@Tmaz Don't use the app for troubleshooting - there's a limited device information through its interface. When you get back home execute these steps from your desktop PC using the BE800 WebGUI.

@Tmaz Can you post your BE800 ethernet ports status: If everything is normal, sometimes resetting the router to its factory defaults helps - press the reset button for about 10 seconds. Configure...