Automatic Internet Failover With Starlink
Understand dual-WAN routing, health checks, recovery behavior, power backup, and testing for automatic Starlink failover.
Understand dual-WAN routing, health checks, recovery behavior, power backup, and testing for automatic Starlink failover.
Check the router before configuration
Automatic failover needs a router that supports multiple WAN connections and health checks. Connect the primary service to its designated WAN and Starlink's supported Ethernet handoff to the secondary WAN. Use the appropriate bypass or upstream-router arrangement for your equipment.
Layout: primary WAN + Starlink WAN → dual-WAN router → office network. The two services do not become a single faster connection simply because both are plugged in.
Configure detection deliberately
Use your router manufacturer's health-check instructions. A link light detects a cable connection, not necessarily working internet access. Choose checks that can detect an upstream outage without overreacting to one missed response.
Example scenario: the router declares the primary unhealthy after repeated failed checks, moves new traffic to Starlink, and waits for a sustained healthy period before returning. This describes the intended behavior, not universal timing values to paste into every router.
Run a controlled test
| Test | Expected observation |
|---|---|
| Disconnect primary WAN | Backup becomes active; record the delay |
| Open business applications | Confirm login, payments, calls or VPN recovery |
| Restore primary WAN | Observe stable failback rather than repeated switching |
| Disable backup during normal service | Confirm the primary remains usable and alerts identify lost redundancy |
Existing calls, VPNs or downloads may reconnect because the public network path changes. Include this in staff instructions rather than promising seamless sessions.
If switching is unstable
Check the health-check target, sensitivity, power, Starlink interruptions and both WAN configurations. Review logs before changing several thresholds. Keep a copy of the last working configuration and a manual recovery procedure. Test again under representative traffic, then record the final settings and results.
Next useful guides
Use the instructions for your exact kit.
Check the official Starlink app and hardware instructions before changing installation, equipment or service settings.
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