A second internet connection is not automatically a continuity solution. The network, firewall, applications and operating procedures all have to support the failover.
Measure the impact of downtime
List the work that stops without internet access: calls, payments, cloud systems, customer service or remote access. Estimate how quickly interruption becomes material.
This determines whether backup connectivity is essential, useful or unnecessary—and how much capacity it needs.
Avoid shared points of failure
Two services can still depend on the same last-mile route, building entry, provider or power source. Ask how each connection reaches the site and what remains shared.
Mobile or fixed-wireless backup can diversify the access method, but signal quality and data limits need testing at the actual premises.
Decide what should continue
A backup link may not need to carry every guest device, update or media stream. Prioritise voice and critical business applications, then shape or block lower-value traffic during failover.
- Define critical applications and users
- Check public IP and inbound-service requirements
- Confirm DNS, VPN and voice behaviour
- Set alerting for failover and recovery
Test the full scenario
Disconnecting the primary link during an agreed test window is the clearest way to verify behaviour. Check active calls, cloud applications, remote access and restoration to the primary service.
Document what users should expect and who to contact. Continuity is stronger when the technical design and operating response are both understood.