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ASUS AX88U Pro Dual WAN doesn't work properly

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My AX88U Pro's dual wan on failover doesn't switch properly to the second network.

First network is a Fiber connection - Automatic IP
First network is a 4G connection - Automatic IP

When the primary WAN is disconnected the secondary WAN just switches between Cold Standby, Hot Standby and the below shown DHCP error. But never says Connected.
But as a primary WAN the 4G connection works properly.


Any ideas what could be wrong here?

When the primary WAN is connected:
Last edited:


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