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How to get external users to our hosted Web sites during a Multi-Wan Failover
We are looking at adding a secondary ISP for our network and I have a question about configuring our network. We host several Web sites to support our business with 100+ concurrent users typically using our sites. I am wondering what needs to be done to allow users to continue using our Web sites during a fail-over situation when external DNS servers point to our static IPs that are on our primary ISP connection. How do these users get routed via the secondary ISP path? If someone could point me to a good article about how to setup this secondary ISP feed and get external access to route through the secondary ISP during a fail-over would be great! Thank you!
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The best way is to use DNS for this - with a secondary IP addr for your domain names which allows failover to the 2nd IP addr.
DNS Failover: Basic Concepts and Limitations
https://ns1.com/resources/dns-failover-basic-concepts-and-limitations
Here is an interesting service:
How to Set Up DNS Failover
https://help.dnsmadeeasy.com/dns-failover/configure-dns-failover/