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DHCP Messaging, Message Types and Formats
on DHCP configuration and operation demonstrated
how DHCP works by showing the processes by which various leasing and
information-exchange activities are accomplished. All of these procedures
rely heavily on the exchange of information between client and server,
which are carried in DHCP messages. Like all protocols, DHCP
uses a special message format, and a set of rules that govern how messages
are created, addressed and transported.
In this section I provide the details
of how DHCP creates and sends messages, and show the formats used for
DHCP messages and options. I begin with a description of how DHCP creates,
addresses and transports messages, and how it deals with message retransmission.
I then outline the DHCP general message format, showing how it is similar
to the BOOTP message format upon which it is based, and also where it
differs. I describe DHCP options, the format used for them, and the
special option overloading feature used for efficiency.
I conclude the section with a complete list of DHCP options.
Related Information: DHCP is most closely related to BOOTP in the area of messaging, so you'll find lots of references to BOOTP in this section. Note especially that DHCP options are based closely on BOOTP vendor extensions, and many of the specific DHCP option types are the same as BOOTP vendor information fields. To avoid duplication, the summary table in this section lists the options/extensions for both protocols, indicating which ones are used by both BOOTP and DHCP, and which are used only by DHCP.
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
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