@AksTech TL-WR820N doesn't have Bandwidth Control feature. It uses 'QoS by device' instead. Use TL-WR820N user guide to configure QoS if you need it - Chapter 4.6.

@Ishkaar Archer C20 WAN/LAN ports are only 100 mbps capable, so faster speeds can be achieved with a gigabit router like C64. You can replace the ethernet cable to the outbuilding with a shorter one...

@Hawklord If using REs in AP mode with the same SSIDs as on your router, your roaming wouldn't be so seamless as with a real mesh network. In general your mobiles will roam between the APs, but there...

@richardclarke79 Check this thread for more details on that matter. If you can't put the xDSL router in true bridge mode, you can disable its wireless radio and configure a DMZ to the ER605 router...

@Tnimni The reason for different location of DHCP settings is that I used a screenshot form er605 v1, but the logic is the same. In general a public IP address for the WAN port should be set as a...

@Tnimni Yes, that's correct. If you want to isolate VR400 traffic, you have to use VLANs on er605.