To configure pfSense as a multi WAN (dual WAN) load balance failover router, you will need to follow these steps:
Connect both WAN connections to your pfSense router.
In the pfSense web interface, go to Interfaces > WAN and click the plus sign (+) to add a new WAN interface.
Give the WAN interface a descriptive name, such as "WAN1" or "WAN2", and select the corresponding network interface from the "Interface" dropdown menu.
Repeat step 2 and 3 for the second WAN connection.
In the pfSense web interface, go to System > Routing and click the plus sign (+) to add a new Gateway.
Give the Gateway a descriptive name, such as "WAN1" or "WAN2", and select the corresponding WAN interface from the "Interface" dropdown menu.
Repeat step 5 and 6 for the second WAN connection.
In the pfSense web interface, go to Services > Load Balancer and click the plus sign (+) to add a new Load Balancer.
Give the Load Balancer a descriptive name, such as "Multi WAN Load Balancer", and select the "Multi-WAN" option in the "Type" dropdown menu.
In the "Gateways" section, select both WAN gateways that you created in steps 5 and 6.
In the "Rules" section, create a new rule to specify which traffic should be sent through the load balancer. For example, you can create a rule to send all traffic through the load balancer, or you can create a rule to send only certain types of traffic (such as HTTP or HTTPS) through the load balancer.
In the "Advanced Settings" section, you can configure additional options for the load balancer, such as the load balancing algorithm and the failover settings.
Click the "Save" button to save your changes.
That's it! Your pfSense router is now configured as a multi WAN load balance failover router. You can test the load balancing and failover functionality by disconnecting one of the WAN connections and observing the traffic flow through the remaining connection.