One my pfsense router, I have set up a computer VLAN and an IOT VLAN. I set up firewall rules that prevent the IOT VLAN from talking to the computer VLAN, but the computer VLAN can talk to the IOT VLAN.
I set up the UDP Broadcast Relay package and it works great. Does the UDP Broadcast Relay package bypass firewall rules preventing the IOT VLAN from talking to the computer VLAN?