if you connect wrongly, you won't get any internet access because of this:
ASUS AC68U - might be working in router mode, and that means you need to connect the LAN port of ONT port 1 to WAN port of AC68U.
Arcadyan - automatically puts itself in AP mode if connected to AC68U, but automatically becomes a router when connected to ONT port 1.
My white ONT (Ericsson) was faulty (front LEDs not on but back LEds flashing). I brought to +Serv to exchange for a new set (black Alcatel-Lucent). I was told that it has been configured and to connect the LAN cable to LAN4 port. I did that and could not get access to internet for both my Asus AC68 and Arcadyan routers. Called 1688 and after getting through to tech support, I was told to connect the LAN cable to LAN1 port of the ONT. Now both the routers are able to access the internet via the ONT.
Anyone encountered this before?
I think it is more of mis-understanding on the actual Port to connect on the ONT.
As @chinkt may mis-interpreted as connect LAN Port-4 of ONT as it mentioned on using LAN cable to connect to LAN with 4 ports, but failed to indicate that only Port-1 is active.
Hence the tech support indicated to connect to Port-1 of ONT.
Router should not be an issue as it is the ONT that failed.
Connecting to Router remain the same.
The person should advice @chinkt to connect to Port-1 on the ONT, and if there is another Port-1, which may be for the telephone, it will not be able to connect as different size.