After configuring the interfaces, follow the steps below:

Still in Settings, in the Network option:

Settings - Network

Click on the Static Routing tab:

Static Routing tab

In this step, we will configure each static route using the IP of UTM B as the destination, determining the routers as the gateway and placing them all in the same administrative distance. In this way, Static Routing will load balance using the source IP of the connection as a base.

Some details of the static routing tab will not be considered in this example, if you want more information, see this page.

Below are the UTM A interface configurations:

Network - Static Routing

Router 1

Click [] to create a new route. The following window will be displayed:

Static Routing - Add Route

Note that in the IP / Destination Network and Destination Gateway fields, the listed objects are of the unique type, so it is necessary to create them in advance. If not, they will not appear in the list. For more information on how to create an IP type object, see this page.

When finished, the static route must be configured this way: 

Static Routing - Add Route - Router 1

To finish the settings, click [].

This completes the configuration of the UTM router 1 static route. Follow the same steps to configure the other routers:

Router 2

Below, an image demonstrating how the UTM Router 2 should be configured:

Static Routing - Add Route - Router 2

Router 3

Below, an image demonstrating how the UTM 3 Router should be configured:

Static Routing - Add Route - Router 3

This finalizes the configuration of the static routes in UTM A, next we will configure UTM B.