Simple Failover
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Sample Scenario
Dual WAN router

In this scenario, you have two separate Internet connections and use a dual WAN router (in either load balancing or failover mode) to route inbound traffic from either connection to the same web server on the local network.
This setup does ensure better outbound connectivity, however if one of the connections fail, and your DNS records are pointing to the IP address of that connection, inbound connections to your web site will still fail:

illustration

By placing Simple Failover somewhere else on the Internet, and have it monitor the server connections, it can correct the DNS records when needed, and visitors will still reach your web-site:

illustration

By configuring Simple Failover to update DNS via both server connections, the DNS server can be on the same server as the web-server.


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