How to connect & Configure my Zyxel USG20 VPN firewall with ONT Router of my ISP
        
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            I am not sure what's kind of your vender of modem.
Generally, In bridge mode.In order to manage the device.They have another port to manage used.
You can image the Port act as Layer 2 switch.
I think you need to ISP verify the modem config as well.
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