Cudy LTE router has LAN/WAN port, so we can alter the port working mode and use a 4G/5G network as the backup solution for internet access. When the LAN/WAN port works as WAN mode, the router will connect to the 4/5G network if the original network service fails.
Common network topology:

Step 1: Make sure the 4/5G network already setup successfully.
Step 2: Open a web browser and go to http://cudy.net or http://192.168.10.1.
For details, please refer to How to log into the web interface of Cudy Router?
Step 3: Go to Advanced Settings->LAN/WAN Switch.

Step 4: Click 'Switch to WAN', then the router will reboot and apply the settings.
Step 5: Connect your router’s LAN/WAN port to the modem or the network port.
Note: Please ensure you already have a modem or your internet is from an Ethernet outlet which provides the internet for you.
Step 6: When the configuration is finished, you will see the status below in System Status page.

10 comments
@Dear Molon,
The function depends on the “Advanced Setting” —“Online Check” function. Did you disable it. If yes, please enable it.
“Hello, first my cuddy Lte n300 working well on 4g. My point is I configure WAN, and when I put my câble, the router switch on WAN/4G. Until now everything is working as expected but if my main router has a connectivity issue, the cuddy router still continu to work on WAN whereas there is no more connectivity. So I don’t see the automatic switch on 4G”
Hello, first my cuddy Lte n300 working well on 4g. My point is I configure WAN, and when I put my câble, the router switch on WAN/4G. Until now everything is working as expected but if my main router has a connectivity issue, the cuddy router still continu to work on WAN whereas there is no more connectivity. So I don’t see the automatic switch on 4G
@Khushbakht
Dear Customer.
Thank you for contacting Cudy support team.
Sorry to tell you that the router doesn’t support this function now. We will provide your feedback to the product department for evaluation.
“Can the Cudy LT500 router be configured to notify me when the main channel is switched off? Notifications by SMS.”
Can the Cudy LT500 router be configured to notify me when the main channel is switched off? Notifications by SMS.
@Peter,
Dear Peter,
For now, Cudy router doesn’t support this feature.
“How can i change the settings to make a WAN to backup if the 4G network is failed?!”