@lMarcel You probably describing a topology like this one: If that's the case switch your Deco in AP mode.

@Dunk-c Login through the web management interface this menu should be here:

@yasreddy That seem like a cabling issue. Try replacing the cable that goes to your C50 WAN port. If the issue persists you can contact your ISP for further assistance.

@Ghost-Fire WDS could be tricky to configure due to its non-standartized implementaion accross different vendors. As for the VPN server feature its better to replace the Archer C6 for Archer C6U if...

@tonyjp2022 This is not about remote management via Tether app but for remote accessing the router's web management interface - details.

@Alex-C Same issue with the latest FW on AX20 v1. This feature request has been filed for a reason. Do you have any other device before AX73, i.e. the IP address that you're trying to access is on...