Modify Option

The Option Properties dialog box lets you modify existing settings for an option in the DHCP server's network database.

See About Macros and Options, for more information about defining DHCP options.

The settings in the Modify Option dialog box are described in the following table.

Name The name of the option. Option names can be a maximum of 128 alphanumeric characters including spaces.

Category The category of the option: The category can be one of Site, Extend, or Vendor.

Site User-defined option definitions, used for unique or custom purposes; accepts Option Codes 128-254.

Extend Option definitions beyond the standard set, which may already be present in versions of the DHCP protocol being used on your server. Rather than upgrading your DHCP implementation, you can add extended options; accepts Option Codes 77-127.

Vendor Hardware-, vendor-, or platform-specific option definitions; accepts Option Codes 1-254. Selecting this context enables the Client Class parameter.

Code A unique numeric code to identify the option. Valid values depend on the option category:

Extend Accepts code values of 77-127

Site Accepts code values of 128-254

Vendor Accepts code values of 1-254

Data Type The type of data that is acceptable for options values:

Ascii ASCII text.

Boolean No value is associated with this data type. Presence of options of this type denote Boolean TRUE; absence denotes FALSE.

IP One or more Internet addresses in dotted decimal format.

Octet Uninterpreted ASCII representation of binary data; for example, a client ID.

Unumber8
Unumber16
Unumber32
Unumber64
Unsigned number, where the trailing number indicates the number of bits in the number.

Snumber8
Snumber16
Snumber32
Snumber64
Signed number, where the trailing number indicates the number of bits in the number.

Granularity Specifies how many values of the given data type are required to make a complete option value. For example, a data type of IP and a granularity of 2 would mean that the option value would need to contain two IP addresses.

Maximum The maximum number of values of a given granularity that can be specified for the option. Building on the previous example, a maximum of 2, with a granularity of 2 and a data type of IP would mean that the option value could contain a maximum of two pairs of IP addresses.

Unlimited No limit to the number of values; implies a maximum setting of 0.

Specify A specific number indicating the maximum.

Vendor Client Classes This option is enabled only when the option category is Vendor. It identifies the client class(es) with which the Vendor option is associated.
The Class is an ASCII string representing the client machine type and/or operating system, for example, SUNW.Ultra5_10. This type of option makes it possible to define configuration parameters that are passed to all clients of the same class.
Enter the client class and then press Enter. You can specify multiple client classes. Only those DHCP clients with a client class value matching one listed here will use the option.

Notify DHCP Server of Change: Check the box if you want the DHCP server to reload the dhcptab immediately after the data is written. Normally, you will want this to happen. However, if you are making multiple changes, you may choose to wait so that the server reloads only after all the changes are written.

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