ZyXEL ES-3148 Guida Utente

ES-3148 User’s Guide

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. You can configure the 
Switch as a DHCP relay agent. 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 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.

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. 

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 relay 

DHCP requests from different VLAN to different DHCP servers.

Click IP Application > DHCP in the navigation panel. The DHCP Status screen displays.