Hello,
I have a RUT240 which came with an older firmware.
Issue is present both with the older firmware and also the RUT2_R_00.07.02.6
After configuring WAN port as LAN port (Disabling WAN, WAN6, adding eth1 to LAN) LAN port stops working.
WAN however works as LAN.
When connecting any device to LAN this does not get DHCP.
As a last resort I have performed a Factory Reset and tried the change again but to no avail.