Dhcp; Chapter 29 Dhcp; Dhcp Overview; What You Can Do - ZyXEL Communications GS1915 Series User Manual

29.1 DHCP Overview

This chapter shows you how to configure the DHCP feature.
DHCP (Dynamic Host Configuration Protocol RFC 2131 and RFC 2132) allows individual computers to
obtain TCP/IP configuration at start-up from a server. If you configure the Switch as a DHCP relay agent,
then the Switch forwards DHCP requests to DHCP server on your network. If you do not configure the
Switch as a DHCP relay agent then you must have a DHCP server in the broadcast domain of the client
computers or else the client computers must be configured manually.

29.1.1 What You Can Do

• Use the DHCPv4 Status screen
• Use the DHCPv4 Option 82 Profile screen
profiles.
• Use the DHCPv4 Global Relay screen
• Use the DHCPv4 Global Relay Port screen
option 82 profile to certain ports on the Switch.
• Use the VLAN Setting screen
the VLAN domain of the DHCPv4 clients.
• Use the DHCPv4 VLAN Port screen
profile to certain ports in a VLAN.
• Use the DHCPv6 Relay screen

29.1.2 What You Need to Know

Read on for concepts on DHCP that can help you configure the screens in this chapter.
DHCP Modes
If there is already a DHCP server on your network, then you can configure the Switch as a DHCP relay
agent. When the Switch receives a request from a computer on your network, it contacts the DHCP
server for the necessary IP information, and then relays the assigned information back to the computer.
DHCPv4 Configuration Options
The DHCPv4 configuration on the Switch is divided into Global and VLAN screens. The screen you should
use for configuration depends on the DHCP services you want to offer the DHCP clients on your network.
Choose the configuration screen based on the following criteria:
• Global The Switch forwards all DHCP requests to the same DHCP server.
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C
(Section 29.3 on page
(Section 29.4.2 on page
(Section 29.4.3 on page
(Section 29.4.4 on page
(Section 29.4.6 on page
(Section 29.4.7 on page
(Section 29.5 on page
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H A P T E R
231) to display the relay mode.
233) to create DHCPv4 option 82
234) to configure global DHCPv4 relay.
235) to apply a different DHCP
237) to configure your DHCPv4 settings based on
238) to apply a different DHCP option 82
240) to enable and configure DHCPv6 relay.
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DHCP