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UniFi - UDM/USG: How to Configure Custom DHCP Options

DHCP options are flexible parameters used for a variety of purposes. The options come in the form of text, hex values, integers, boolean statements, MAC addresses, or IP addresses. Default options are already used by most devices on the network today. 

These are the pre-defined DHCP options available in the UniFi Network application:

  • DHCP UniFi Network application Option 43
  • DHCP NTP Server Option 42
  • DHCP Network Boot Option 66 and Option 67 
  • DHCP Time Offset Option 2
  • DHCP TFTP Server Option 66
  • DHCP WPAD URL Option 252
  • DHCP WINS Server Option 44

Additional custom options can be specified using the DHCP Option Code

This article describes how to configure DHCP options outside of the standard set on the UniFi Network web application. This applies to UDM and USG models with the latest firmware.

Note: For more information on DHCP, see Intro to Networking - Dynamic Host Configuration Protocol (DHCP).

How to configure custom DHCP options

Follow the steps below to configure the custom DHCP option(s) on the Network web application on the UDM/USG models:

New Web UI DHCP options
Classic Web UI DHCP options

1. Navigate to the  settings.png  Settings > Advanced Features > Advanced Gateway Settings > DHCP > DHCP Options section.

2. Click Add DHCP Option to create the required DHCP option and specify the code number + type as in the example below:

Name: code_224
Code: 224
Type: Text

Create-new-DHCP-group.png

3. Apply the settings.

4. Navigate to the  settings.png  Settings > Networks and edit or create the required LAN network.

5. Click Advanced, scroll down, and click Add DHCP Option. The DHCP option you created earlier will now be displayed in the Custom DHCP Options section. 

6. Select the DHCP option you created, click Next.

7. Add the needed value for the custom DHCP option and click Add DHCP Options.

Add-DHCP-option.png

NOTE: The other pre-defined DHCP options can be configured in the Advanced DHCP Options section.

1. Navigate to the  settings.png  Settings > Services > DHCP > DHCP Options section.

2. Create the required DHCP option and specify the code number + type. For example:

Name: code_224
Code: 224
Type: Text

3. Apply the settings.

4. Navigate to the  settings.png  Settings > Networks section and edit or create the required LAN network.

6. Expand the Advanced DHCP Options section.

5. The previously created option will now be displayed under the Custom DHCP Options.

6. Add the needed value for the custom DHCP option and apply the changes.

NOTE: The other pre-defined DHCP options can be configured in the Advanced DHCP Options section.

Related Articles

Intro to Networking - Dynamic Host Configuration Protocol (DHCP)

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