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Cellular Backup for NBN and Fixed WAN
A useful backup service must detect failure, switch predictably, carry essential traffic and return safely when the primary link recovers.
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Some applications handle failover quietly, while others may briefly reconnect or re-establish sessions. That is normal, because the public-facing IP path can change when traffic moves from the fixed service to the cellular network. The important thing is whether the interruption is acceptable for the business process and whether the design has been tested under live conditions. Comset’s role here is usually to match the failover design to the application.…
2026-07-17 Can a Comset router automatically take over if my office NBN fails?Yes, that is one of the most common use cases. The router watches the primary WAN connection and can switch traffic to the mobile service when the fixed link fails. The details matter, though: the failover trigger, the return-to-primary behaviour and the way services recover can all affect how seamless the experience feels to users. For a straightforward office backup, Comset will usually want to know what services must keep running, how many users are in…
2026-05-30 How can a router return to the primary WAN connection without creating repeated failover and failback instability?Use separate failure and recovery thresholds. For example, the router may switch to cellular after several failed checks but wait for a longer period of stable primary service before returning. This prevents a marginal NBN or fixed-WAN link from pulling traffic back and forth every few seconds. Health checks should use more than one dependable destination where possible, and the timers should reflect the application’s tolerance for interruption. Some VPNs…
Cellular backup should be treated as a separate service that is tested regularly. Configure the router to check reliable internet targets, not only the physical WAN link, and set sensible failure and recovery timers. Confirm the backup SIM is active, has data available and uses the correct APN. Test by disconnecting the primary service and by simulating a situation where the NBN modem stays powered but cannot reach the internet. Verify that critical appli…
2026-05-29 Which traffic should be limited or prioritised while a site is operating on cellular backup?Prioritise the services that keep the business operating: voice, payments, essential cloud applications, alarms, remote support and operational telemetry. Large backups, operating-system updates, guest Wi-Fi, entertainment traffic and non-urgent file synchronisation can quickly consume a mobile allowance or congest the backup path. Traffic shaping, separate VLANs, firewall rules or application policies can be used to restrict lower-priority use while the …
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