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:
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.
Note: 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.
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.
In this example meraki.com will 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 look back to the in-house Mitel Server to obtain DHCP information.