Multiple
Values for a DHCP Option
You can enter multiple option values for an Option
Code with the same Option Name,
but all values for a particular code and name combination must be
the same type (IP address, ASCII, or hexadecimal). If one type is
inherited or entered, and later a different type is entered for
the same code and name combination, the second type will overwrite
the first type.
You can enter an Option Code more than
once by using a different Option Name. In
this case, the Option Type for the Option
Code can differ among the multiple option names. For example, if option
Coastal Server (option code 6) is configured with IP address type,
option Server XYZ (option code 6) with ASCII type is also allowed.
The firewall sends multiple values for an option (strung together)
to a client in order from top to bottom. Therefore, when entering
multiple values for an option, enter the values in the order of
preference, or else move the options to achieve your preferred order
in the list. The order of options in the firewall configuration
determines the order that the options appear in DHCPOFFER and DHCPACK
messages.
You can enter an option code that already exists as a predefined
option code, and the customized option code will override the predefined
DHCP option; the firewall issues a warning.