To setup Simplifi Failover using only your existing modem, simply connect a LAN cord from your existing modem output into Simplifi using the USB to Ethernet Dongle then plug the USB end of the dongle into Simplifi. No additional configuration is necessary.
In this configuration, your existing ISP (Internet Service Provider) will provide primary Internet through Simplifi where Simplifi will then either pass data through LAN connected devices or through Simplifi’s WiFi acting as the Router.
For more information, please go to https://www.simplifi.io/failover for additional details