Overview
Readers will learn how to configure DHCP options on the UDM and USG models.
- Applicable to the latest firmware on the UDM and USG models.
- More information on DHCP can be found in the Intro to Networking - Dynamic Host Configuration Protocol (DHCP) article.
Table of Contents
Introduction
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. This article will explain how to configure options outside of the standard set.
The pre-defined DHCP options that are available in the UniFi Controller are listed below.
DHCP UniFi ControllerOption 43DHCP NTP ServerOption 42DHCP Network BootOption 66 and Option 67DHCP Time OffsetOption 2DHCP TFTP ServerOption 66DHCP WPAD URLOption 252DHCP WINS ServerOption 44
Additional custom options can be specified using the DHCP Option Code.
Configuring Custom DHCP Options
Follow the steps below to configure the custom DHCP option(s) on the UDM/USG models:
1. Navigate to the 
Settings > Gateway > 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 > Networks > Local Networks section and edit or create the required LAN network.
5. The previously created option will now be displayed in the Custom DHCP Options section.
6. Add the needed value for the custom DHCP option and apply the changes.
1. Navigate to the 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 > 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.
Related Articles
Intro to Networking - Dynamic Host Configuration Protocol (DHCP)