Defining static routes on the firewall

In the Configuration > Network > Routing menu > Static routes tab:

1. Click Add.
2. In the Destination network (host network or group object, network or group object) column in the new line.
3. Select the Web-Tier object.
4. Click in the Interface column.
5. Select the transit interface.
6. Click in the Gateway column.
7. Select the Transit-Router object.
8. Double-click on the Status column to enable the route.
9. Repeat steps 1 to 8 to create the route to the App-Tier network.
10. Repeat steps 1 to 8 to create the route to the DB-Tier network.
11. Click on Apply to validate the configuration.

The firewall's static routes will then resemble the following: