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To detect a failover condition between wan or sim cards the router pings at a given interval.

It appears this interval is 3 seconds.

Does this mean that the router is constantly pinging or is this only when a failure is detected?

While a ping is a small amount of data it would be very wasteful to constantly ping it every 3 seconds.

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It does by default do tests every three seconds. However, if you were to look at Failover interface configuration, there is a field, where you can define the time between each test.

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