@Pilkie Disable Smart Connect feature and you would be able to have two different SSIDs for 2.4GHz and 5 GHz:

@bulldurhamdevil According to its user guide TR-WR902AC should be able to do the job you looking for.

@kenjei Make sure that your Internet IP address corresponds to your public IP address: If they are different then that's the problem, you may be behind a CG-NAT or your Internet IP address is a...

@System_Manager You can change the channel and channel width from the Advanced=>Wireless Settings: To be able to do that Smart Connect feature should be disabled.

@Sadocha You can follow this guide (Case 1) to configure Archer C64 in AP mode. AP mode is mainly used when you have an ISP or your own NAT capable router already installed and you want to expand...

@obcx Your assumption is correct. It could be a cable issue or just the device connected to this LAN port, is only 100mbit/s capable.