Having trouble getting your guest WiFi portal working using UniFi?
I did too and its most likely caused by you using a separate DHCP server on the network rather than using your USG for DHCP.
Here is the fix!
Go into ‘Wireless Networks’ and Edit the guest WiFi network.
Scroll down to ‘Advanced Options’ and you will see an are to enter Excepted Devices. These devices are allowed to receive broadcast traffic over the internet which includes DHCP requests and responses. The default entry here includes your USG gateway by default but if you’re not using it as a DHCP server you need to add an entry here.
Click on ‘Add Clients’
Next select the MAC address of the DHCP server on your network. In my test lab I am using a Windows 2016 Server as my DHCP server. Tick the MAC address and click on Apply.
Click ‘Save’ to provision the changes and after a minute or two devices on the guest network will be able to talk to the USG and your DHCP server.
Below shows my mobile phone registering on the network over the guest network.
Security
Now you may be wondering what happens if your DHCP server is also a file server on the network. Will adding an exception for the DHCP server mean that guest devices will now be able to speak to the server?
NO! Guest devices will not be able to connect to any folder shares or even ping the server IP address.
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27th June 2019
Thanks for a very good detailed tutorial which solved my problem.