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actual DHCP option numbers themselves. See “Request for Comment and
Internet Draft Documents” for information on what IETF RFCs are and how
to view them yourself.
Architected DHCP Options
Architected options 0 though 127 and option 255 are reserved for definition by
RFCs. The DHCP server, the DHCP client, or both the server and client use options
in this set. The administrator can change most architected options, but some
options are reserved for the exclusive use of the client and server programs
themselves.
Examples of architected options that the administrator must not configure at the
DHCP server include the following:
52 Option overload
53 DHCP message type
54 Server identifier
55 Parameter request list
56 Message
57 Maximum DHCP message size
60 Class identifier
77 User class
User-defined DHCP Options
Options 128 through 254 represent user-defined options that administrators define
to pass information to the DHCP client to accomplish site-specific configuration
parameters.
The format of user-defined options is always a string of hexadecimal bytes, and the
server passes the specified value to the client. In order for it to be of any use,
however, the client must have some special, application-specific program or
command file to process the value.
Request for Comment and Internet Draft Documents
The Internet is governed by protocols that are defined in Internet Engineering Task
Force (IETF) Request for Comment (RFC) documents. RFCs outline existing
protocols, suggest new protocols, and establish standards for the Internet protocol
suite. Internet drafts are proposals, techniques, and mechanisms that document
IETF work in progress. Online copies of RFCs and Internet Drafts are available
from IETF.
To access RFCs or Internet Drafts, point your Web browser at the following URL,
which links to the Internet Documentation and IETF Information home page:
http://www.ietf.org
For a better understanding of DHCP, see the following RFC documents:
RFC 2131
Dynamic Host Configuration Protocol
Chapter 17. DHCP Server 413