Home > General Administration > Cross-Platform Content > Setting Custom DHCP Options

Setting Custom DHCP Options

A DHCP option is a purposefully coded piece of data - either an IP address, string of text, or hex value. This data is used by DHCP clients when communicating with the network. The majority of network devices use the default options provided natively by many DHCP service providers, including the MX Security Appliance and MS Layer 3 Switch. However, in some instances, a DHCP deployment requires the configuration of additional DHCP options, most often when implementing DHCP with VoIP phones and other specific function devices.  

This article covers:

  • Configuring DHCP options on the MX Security Appliance, Z-series Teleworker Gateway, or MS Layer 3 Switch
  • Commonly used DHCP options
  • Example DHCP option configurations

Configuring DHCP Options

  1. Navigate to Security & SD-WAN > Configure > DHCP (or, on the MS switch, Switch > Configure > Routing & DHCP > [the interface being edited] > DHCP settings)
  2. Select Add a DHCP option.
  3. Select the desired Option from the list or if it isn’t listed, add a custom option.
  4. Input the DHCP Code.
  5. Select the Type as Text, IP, or Hex.
  6. Enter the desired value for the option in the Value field.
  7. Click Save Changes.



Commonly used custom options

Many DHCP options can be specified on a DHCP server, though there are a few that tend to be used frequently. For more information on some of the more common DHCP options and what they configure, reference our article on Common DHCP Options.

A full list of DHCP options and their definitions can be found here. Note that some DHCP option codes are reserved for vendor-specific options. Consult with vendor documentation to determine the code’s purpose for their devices.

Example DHCP option configurations

A connection-specific DNS domain suffix is assigned to DHCP clients using DHCP option 15. The steps below show how to assign DHCP option 15 in Dashboard.

  1. Navigate to Security & SD-WAN > Configure > DHCP (or, on the MS switch, Switch > Configure > Routing & DHCP > [the interface being edited] > DHCP settings)
  2. Find the setting DHCP options.
  3. Click Add a DHCP option.
  4. Choose Custom from the Option drop-down.
  5. For Code enter 15, choose Text for Type, and for Value enter the DNS domain suffix.
  6. Click Save Changes.

In this example, meraki.com will be assigned using DHCP Option 15.


An ipconfig /all from a Windows client shows the suffixes have been assigned:


In our second example, DHCP option 130 will direct Mitel Phones to be looking back to the in-house Mitel Server to obtain DHCP information.


  1. Navigate to Security & SD-WAN > Configure > DHCP (or, on the MS switch, Switch > Configure > Routing & DHCP > [the interface being edited] > DHCP settings)
  2. Under DHCP options, click Add a DHCP option.
  3. Choose Custom from the Option drop-down.
  4. Under Code enter 130.
  5. Under Type enter Text.
  6. Under Value enter MITEL IP PHONE.

Last modified



This page has no classifications.

Explore the Product

Click to Learn More

Article ID

ID: 1419

Explore Meraki

You can find out more about Cisco Meraki on our main site, including information on products, contacting sales and finding a vendor.

Explore Meraki

Contact Support

Most questions can be answered by reviewing our documentation, but if you need more help, Cisco Meraki Support is ready to work with you.

Open a Case

Ask the Community

In the Meraki Community, you can keep track of the latest announcements, find answers provided by fellow Meraki users and ask questions of your own.

Visit the Community