@pulsartiger In the Unifi Controller, for the network you set the subnet for the VLAN as follows
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And the VLAN ID as follows
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Then in pfSense you create a VLAN for the same ID
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And firewall rules as appropriate. For example I allow my phone/ipad access to certain applications on the LAN (through a HA proxy). Printers are also allowed. I block everything else on VLAN100 to LAN and VLAN200. The last rule is to allow everything, everywhere.
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