Introduction To Dhcp - 3Com MSR 50 Series Configuration Manual

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Introduction to DHCP

DHCP O
This document is organized as follows:
"DHCP Overview" on page 565
■
"DHCP Server Configuration" on page 573
■
"DHCP Relay Agent Configuration" on page 589
■
"DHCP Client Configuration" on page 599
■
"DHCP Snooping Configuration" on page 601
■
"BOOTP Client Configuration Example" on page 606
■
The fast expansion and growing complexity of networks result in scarce IP
addresses assignable to hosts. Meanwhile, with the wide application of wireless
networks, the frequent movement of laptops across networks requires that the IP
addresses be changed accordingly. Therefore, related configurations on hosts
become more complex. Dynamic host configuration protocol (DHCP) was
introduced to solve these problems.
DHCP is built on a client-server model, in which the client sends a configuration
request and then the server returns a reply to send configuration parameters such
as an IP address to the client.
A typical DHCP application, as shown in
multiple clients (PCs and laptops).
Figure 161 A typical DHCP application
DHCP client DHCP client
DHCP client
n
When residing in a different subnet from the DHCP server, the DHCP client can get
the IP address and other configuration parameters from the server via a DHCP
VERVIEW
Figure
DHCP server
DHCP client
161, includes a DHCP server and