Plan a staged test that mirrors your site: verify both SIMs register, obtain their APNs, and pass traffic to the critical endpoints you use in production. Simulate failures: block the primary WAN, create a weak signal, or disable mobile data, and watch how the router switches paths. Confirm alerts are received and that active sessions, VPNs and remote access survive or recover cleanly after the switch. Document the configuration and test results: health check targets, failure thresholds, retry timing, preferred SIM, and any data limits or session handling quirks. Run follow up tests to confirm the failover meets your uptime needs.
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How can I test failover in a real site before going live?
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