38
DHCP Overview
Wh n configuring DHCP, go to these
e
sections for information you are interested in:
z
Introduction to DHCP
z
DHCP IP Address Assignment
DHCP Packet Format
z
z
Protocol Specification
Intro
nd the
s to DHCP servers for
plement dynamic allocation of network resources.
ne DHCP server and multiple clients (such as PCs and laptops),
as shown in
Figure 38-1
duction to DHCP
With networks getting larger in size and more complicated in structure, lack of available IP addresses
becomes the common situation the network administrators have to face, and network configuration
becomes a tough task for the network administrators. With the emerging of wireless networks a
using of laptops, the position change of hosts and frequent change of IP addresses also require new
technology. Dynamic Host Configuration Protocol (DHCP) is developed to solve these issues.
DHCP adopts a client/server model, where the DHCP clients send request
configuration parameters; and the DHCP servers return the corresponding configuration information
such as IP addresses to im
A typical DHCP application includes o
.
Figure 38-1
Typical DHCP application
ment
IP Ad
r
of d
z
assignment. The administrator configures static IP-to-MAC bindings for some special
DHCP IP Address Assign
dress Assignment Policy
Cur ently, DHCP provides the following three IP address assignment policies to meet the requirements
ifferent clients:
Manual
clients, such as a WWW server. Then the DHCP server assigns these fixed IP addresses to the
clients.
38-1