D-Link NetDefendOS User Manual page 403

The following parameters can be set for a custom option:
Code This is the code that describes the type of information being sent to the client. A large
list of possible codes exists.
Type This describes the type of data which will be sent. For example, if the type is String then
the data is a character string.
Data This is the actual information that will be sent in the lease. This can be one value or a
comma separated list.
The meaning of the data is determined by the Code and Type. For example, if the code is
set to 66 (TFTP server name) then the Type could be String and the Data would then be a
site name such as tftp.example.com.
There is a large number of custom options which can be associated with a single DHCP server
and these are described in:
RFC 2132 - DHCP Options and BOOTP Vendor Extensions
The code is entered according to the value specified in RFC 2132. The data associated with the
code is first specified in NetDefendOS as a Type followed by the Data.
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Chapter 5: DHCP Services