@mapp Was that LTE router used with the same T-Mobile contract? If you still have that LTE router, then perhaps it would be best to revert back to your old Internet setup if it allowed moderate NAT.

@Anemone Do you have the "Band Steering" option activated on your EX510 router? (this is the feature that makes the 2.4 GHz Wi-Fi and the 5 GHz Wi-Fi appear as one network) In case it is, then switch...

@roblugg The "Connected Devices" list should be automatically populated once the IPv6 Internet connection is configured correctly and working.

@Hhead Hi, If you can't find a built-in "Internet Speed Test" in the Archer BE3600, then it is not possible. In fact, only very few of TP-Link's routers have ever had such a feature. I think the...

@Anemone Hi, The RE450 V4 is on the OneMesh compatibility list, but the EX510 is not. https://www.tp-link.com/en/onemesh/product-list/#wi-fi-routers A Mesh network can only be established between...

@roblugg Yes, it asks for the long IPv6 address (the one that usually starts with a 2). A link-local IPv6 address (one that starts with fe80) will not work.