Download User Manual - D-Link

5.2.2. Custom Options
Chapter 5. DHCP Services
5.2.2. Custom Options
Adding a Custom Option to the DHCP server definition allows the administrator to send specific
pieces of information to DHCP clients in the DHCP leases that are sent out.
An example of this is certain switches that require the IP address of a TFTP server from which they
can get certain extra information.
Custom Option Parameters
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.mycompany.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.
261