Failover is a network feature that automatically switches traffic from a primary connection to a backup connection when the primary connection becomes unavailable.
For an ISP, failover helps keep customers online when an internet link fails. The Centipid discussion describes a setup where WAN1 is monitored using test IP addresses and traffic switches to WAN2 when the primary link becomes unreachable.
Related terms: Load Balancing, WAN, Backup Link, Primary Link, Recursive Routing, Monitoring IP, Route, Gateway
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