ZyXEL GS1920 Series User Guide - Page 281
DHCP Overview
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CHAPTER 35 DHCP 35.1 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 don't 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. 35.1.1 What You Can Do • Use the DHCPv4 Status screen (Section 35.3 on page 283) to display the relay mode. • Use the DHCPv4 Relay screen (Section 35.4 on page 283) to enable and configure global DHCP relay. • Use the VLAN Setting screen (Section 35.5 on page 289) to configure your DHCP settings based on the VLAN domain of the DHCP clients. • Use the DHCPv6 Relay screen (Section 35.6 on page 293) to enable and configure DHCPv6 relay. 35.1.2 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. 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 to relay DHCP requests to different DHCP servers for clients in different VLAN. GS1920 Series User's Guide 281