ZyXEL Communications ES-3124PWR - Manual (Page 167)

Dimension ES-3124PWR Ethernet Switch
DHCP Relay 22-1
This chapter describes the DHCP relay and shows you how to configure the DHCP Relay screen.
22.1 Overview
DHCP (Dynamic Host Configuration Protocol, RFC 2131 and RFC 2132) allows individual clients to obtain
TCP/IP configuration at start-up from a DHCP server. You can configure the switch to relay client TCP/IP
configuration requests to a DHCP server and the server’s responses back to the clients.
22.1.1 DHCP Relay Agent Information
The switch can add information to client TCP/IP configuration requests that it relays to a DHCP server. This helps
provide authentication about the source of the requests. You can also specify additional information for the switch
to add to the client TCP/IP configuration requests that it relays to the DHCP server. Please refer to RFC 3046 for
more details.
The DHCP relay agent information feature adds an Agent Information field to the option 82 field of the DHCP
headers of client TCP/IP configuration request frames that the switch relays to a DHCP server. The following lists
the DHCP relay agent option 82 information that the switch sends to the DHCP server:
¾ Slot ID (1 byte)
¾ Port ID (1 byte)
¾ VLAN ID (2 bytes)
¾ System name (up to 32 bytes, this is optional)
22.2 DHCP Relay Configuration
To configure DHCP relay information and specify the DHCP server(s), click Advanced Application and DHCP
Relay to display the screen as shown next.
Chapter 22
DHCP Relay