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I’ve been around information technology since 1983 with computers such as DEC Rainbows (weird machine – the standard DOS couldn’t format its own floppy disks – remember them? – and I had to format them on a friend’s IBM PC) to Radio Shack TRS-80 to Apple ][e and Apple //c in the beginning. One important thing to remember: If you statically set the IP addresses of your UniFi devices you will not get the DHCP Option 43 provided to the devices. Browserling has a page to convert the IP address to hex: Convert IP Address to Hex Format. You have to add 01:04 to the hex version of the IP address of your UniFi Controller. In my DHCP configuration (on pfSense), I added DHCP Option 43.That way when a device restarts (such as after a reboot, power loss) it can find the controller when it boots and executes the set-inform The hostname unifi will resolve to my UniFi Controller.

I configured my DNS server with an alias that allows unifi to resolve to the UniFi Controller.The option that I took, or maybe it is two options, is: There are a number of ways that this can be resolved (other than putting the Controller on the same subnet) as documented in UniFi – Device Adoption Methods for Remote UniFi Controllers. The problem, if you will, with this configuration is that when a UniFi device looks for the UniFi Controller is that is cannot find the Controller on a different subnet.

Here is the scenario: My UniFi devices are on a separate subnet from my UniFi Controller. This is, as always, is maybe more of an aide-mémoire for me, but may be helpful if someone else is searching for a solution…