pfSense Multi-WAN load balance and automatic failover
You have more than one ISP link and want to load balance and automatic failover the internet. you can do it from the pfSense. Follow this article and will be able to divide the traffic while all links are up and if the links are down except one. All users will be fall back to the working ISP. Load balance to the multiple ISP and automatic failover if there is any ISP link is down.