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Services > DHCP Server > LAN > Actions > View Details:Range Start and Range Stop to desired values (x.x.x.30 and x.x.x.240 suggested)UniFi Controller IP if you have one
Probably set DomainLeases > Map Static IP for devices that you want to have a static IPWizards > UPnP > Add NewInternal Interface > switch0External Interface > WAN PortApplydynamic dns QoS