Starlink as a secondary ISP with Ubiquiti: failover and load balancing
Why use Starlink as a secondary ISP?
For a business, office, or remote property, relying on a single Internet line creates a major single point of failure. By adding Starlink as a secondary WAN, you improve continuity when fiber goes down or mobile networks are congested.
With the right design, failover is automatic: workstations, payment terminals, VPN access, and cameras keep running with minimal disruption.
Ubiquiti failover: automatic switching when the main line fails
With Ubiquiti hardware (UDM Pro, UXG, UniFi gateways), we typically configure:
- a primary WAN link (usually fiber),
- a secondary Starlink link,
- WAN health checks,
- traffic priority for critical services.
If the main WAN fails, traffic is switched to Starlink within seconds. This drastically reduces downtime and operational risk.
Load balancing: distribute traffic intelligently
Load balancing can spread sessions across both WAN links. Depending on your needs, we can:
- keep mission-critical traffic on fiber,
- offload non-critical usage to Starlink,
- apply policies by VLAN, user group, or application.
Important: load balancing does not merge two links into a single session speed boost. The real goal is overall stability and network resilience.
Key technical points to plan
A reliable deployment should include:
- IP design, NAT behavior, and return paths,
- VPN session handling and stickiness,
- QoS for voice and video meetings,
- monitoring and alerting (WAN loss, jitter, latency),
- local WiFi optimization, often the real bottleneck.
Best-fit use cases
This architecture is ideal for:
- cloud-dependent offices,
- SMB sites with critical connectivity,
- connected homes with heavy remote work,
- temporary sites or poorly served areas.
Conclusion
Starlink as a secondary ISP with Ubiquiti is a strong foundation for resilient networks. The value is not only bandwidth, but service continuity.