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I'm having problems with devices getting duplicate IPs. I was a problem with my IPhone not showing Norton Security installed or being discovered correctly. It turns out that the phone had an IP assigned that was the same from a device that was previously on the network. I reset my Core and removed all devices and then added my IPhone and it was discovered correctly and it showed Norton Security installed. All the other devices installed correctly until I added my wife IPhone joined the network again. One of the devices that I previously had on the network was on Previously on your network and when I added the IPhone it obtained the same IP as the device that was previously on. This caused it to not discover the iPhone correctly and it did not show that Norton Security was installed, before I reset the Core this is the only IPhone that said that Norton Security was installed. There is a problem with DHCP duplicating IPs with IP addresses on Previously on the network and preventing devices from being identified correctly.