We must first establish a connection to the internet before we can configure pfSense to allow other networks to access it. The example we provided is a typical WAN configuration for a Small Office/Home Office (SOHO) environment. By setting up the WAN interface as the only interface with direct access to the internet, we are securing the network behind the firewall and establishing complete control over our networks. All networks behind the firewall must now abide by the rules we create.