The ISPUnity application is a software load-balancer with failover capabilities. it needs to be deployed on any linux machine with 3 Network Interfaces. The first two network interfaces plug into the primary ISP router and secondary router respectively. All servers, workstations and other devices in your environment access the Internet through the third LAN interface of the router.
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This is what the Interfaces look like when the router is setup. More documentation is available here.