@ambivalent 

Hi, Thanks for your time and patience.

The current firmware 1.2.1 has optimized the WAN Auto-Detect feature on Deco XE75. The WAN port would not change unless the physical connection between the modem and router was broken. So if only the internet service went down but the modem is still powered on and connected to the main XE75, it would still remain on the same WAN port.

May I know what are the devices that connected via Ethernet cables behind the main Deco XE75?

Are you able to connect the laptop to the satellite Deco XE75 and its Ethernet connection would remain as the local network all the time?

Thank you very much.

Best regards.

  @ambivalent 

Hi, Thanks for the update. You got mostly right and the main Deco did become "confused" about which one is the WAN port and reset ports, but not including Wi-Fi. the wireless devices are still able to communicate with each other and the wired clients to the satellite Deco units.

All the Ethernet ports on the main Deco are WAN/LAN auto-sensing and would consider themselves as WAN ports if they failed to obtain an IP address from the modem during its power cycle.

The option to manually designate a port as the WAN port is still under discussion. Currently, the new firmware has optimized this auto-sensing mechanism. If the physical connection remained unchanged, in your case not power cycling the modem, main Deco will still keep the port to the modem as the WAN port, the rest two ports as LAN ports. So during the internet outage, the Whole LAN communications remained.

So before the implementation of designating a port as the WAN port, moving the Linux host (running static IP) and Roku to satellite XE75 pro would be a temporary solution.

Best regards.