This support for multiple WAN connections enables pfSense to load balance or failover traffic from a LAN to multiple internet connections. With load balancing, traffic from the LAN is shared out on a connection-based, round-robin basis across the available WANs. With failover, traffic will go out to the highest-priority WAN, until it goes down. Then, the next one is used. pfSense monitors each WAN connection using either the gateway IP or an alternate monitor IP address, and if the monitor fails, it will remove that WAN from use. This also reduces latency to users. Load balancing can be implemented with hardware, software, or a combination of both.
Multi-WAN router support for failover or load balancer
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