Preventing false positives during device UP/DOWN Status monitoring
It is important to distinguish between monitored device “down” event and event when monitoring application itself loses network connection.
When network monitoring application itself losses network connectivity it should not result in alert emails or text messages with monitored device
down events as it would be classified as false positive alerts.
To monitor its own network connectivity Nectus Server uses default ICMP probe for its default gateway with an inter- packet delay 3x faster
than normally used for monitoring all the devices. This allows Nectus monitoring service to detect loss of network connection faster than any of the normal device probes
would return “device down” alert. If Nectus server detects that it lost network connection it stops all monitoring activity for 5 min.
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