@aboninski The problem comes from your ISP modem/router configuration - the subnet mask 255.255.192.0 on your router (A) WAN interface. Your ISP device already does NAT so the configuration I...

@aboninski Probably if you post some screenshots it would be obvious to us what's going on. Describe your network topology and the LAN IP address space.

@aboninski Well that's the issue - WAN port LED should be green if everything's OK and you should be able to reach the device at http://<IP_address> If you can't reavh its WebGUI reset to factory...

@aboninski When AX53 (B) is in AP mode (Case 1) you should use its WAN port for uplink to your modem. Test if that will make any difference.

@Mattgalbiati In rare cases a faulty ethernet ports could cause this as I posted initially. Thanks for the feedback.

@ydlazkov The video you've watched is probbaly not wrong. When connecting the RE200 whithout using Easymesh the extended network could be "SSID_EXT".