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Step1: In the web GUI, go to the Configuration > Network > Interface > Trunk > User configuration > Add screen. Set WAN2’s mode to Passive.
Step3: Go to Configuration > VPN > IPSec VPN > VPN Gateway.
Set My Address to "0.0.0.0" (The USG will dial-up with the active WAN interface first).
Since WAN2’s interface IP is dynamic, you can use Dynamic VPN in this case.
Please use the command line "
Router(config)# client-side-vpn-failover-fallback activate"
The tunnel will fall back to WAN1 automatically once the WAN1 connection has recovered.
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