ZyXEL Communications USG210 - How to Configure the 3 G;LTE Interface on the Zywall;Usg as a WAN Backup

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How to Configure the 3G/LTE Interface on the ZyWALL/USG
as a WAN Backup
This is an example of using ZyWALL/USG to configure 3G/LTE interface as a WAN
backup that ensures the ZyWALL/USG provides the continuously Internet
connections when the primary WAN interface is down. After configuration, it can
provide additional mobile broadband WAN connectivity or a redundant link for
maximum reliability.
ZyWALL/USG with 3G/LTE Interface as a WAN Backup Example
Note: This example includes weighted load balancing (Weighted Round Robin) so that
most of your Internet traffic is handled by ISP connected to wan1 before it fails over to
3G/LTE.
All network IP addresses and subnet masks are used as examples in this article. Please
replace them with your actual network IP addresses and subnet masks. This example was
tested using USG310 (Firmware Version: ZLD 4.25).