@Dinu_ks When you disable smart connect and set the same SSID for both bands, the two phones still prefer 2.4G WiFi by default, which must be the behavior of the client, since smart connect has...

@crazyduck If you are using OpenVPN Client, you could try this suggestion to see if it works: https://community.tp-link.com/en/home/forum/topic/610498?replyId=1212358

@billiebbb Make sure they are both connected to the same main WiFi network, if one of them is connected to guest network, they will not be able to talk with each other unless you allow the guests to...

@baxisey41 Thanks for sharing, except for WiFi6 routers, now there are Wi-Fi 6E and Wi-Fi 7 routers, which added a new Wi-Fi Band 6GHz Wi-Fi. Such as Wi-Fi 7 Routers | TP-Link

@InboundDreams NAT Loopback is usually supported by default on TP-Link routers, you could enable remote management on your router and check if you will be able to access the router web interface both...

@Krzysgg Since VPN subnet is different from the router LAN subnet, I think no additional settings needed, just configure DHCP address reservation as usual on both routers: How to configure Address...