To enable Probing on Static Routes, follow the steps below:
Step 1: Log in to the Firewall GUI. Step 2: Go to Network | Routing. Step 3: Click the "Add" button. Step 4: Go to Probe, and select "Create new Network Monitor object".
Step 5: Select the name for the Probe. Step 6: Select the Probe Type (usually "Ping (ICMP) - Explicit Route"). Step 7: Select the Probe Target (for example, Google's DNS). Step 8: Select the Next Hop Gateway. Step 9: Select the Outbound Interface.
It should look like this:
Click on the "Add" button to finish setting up the static route (for example, a route for our computer to surf the internet through a specific WAN interface).
Select the Probe default state is UP to have the route consider the probe to be successful (i.e. in the "UP" state) when the attached Network Monitor policy is in the "UNKNOWN" state. This is useful to control the probe-based behavior when a unit of a High Availability pair transitions from "IDLE" to "ACTIVE" state, because this transition sets all Network Monitor policy states to "UNKNOWN."