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C
H A P T E R
This chapter shows you how to configure the DHCP feature.
33.1 DHCP Overview
DHCP (Dynamic Host Configuration Protocol RFC 2131 and RFC 2132) allows individual
computers to obtain TCP/IP configuration at start-up from a server. You can configure the
Switch as a DHCP server or a DHCP relay agent. When configured as a server, the Switch
provides the TCP/IP configuration for the clients. If you configure the Switch as a relay agent,
then the Switch forwards DHCP requests to DHCP server on your network. If you don't
configure the Switch as a DHCP server or 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.
33.1.1 DHCP Modes
The Switch can be configured as a DHCP server or DHCP relay agent.
• If you configure the Switch as a DHCP server, it will maintain the pool of IP addresses
along with subnet masks, DNS server and default gateway information and distribute them
to your LAN computers.
• 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.
33.1.2 DHCP Configuration Options
The DHCP 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.
• VLAN - The Switch is configured on a VLAN by VLAN basis. The Switch can be
configured as a DHCP server for one VLAN and at the same time the Switch can be
configured to relay DHCP requests for clients in another VLAN.
GS-4012F/4024 User's Guide
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DHCP
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