ZyXEL Communications Dimension ES-4124, User Manual

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ES-4124 User’s Guide
Chapter 30 DHCP 203
30.4.1 DHCP Relay Agent Information
The switch can add information to client DHCP 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 DHCP 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 DHCP 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:
• Slot ID (1 byte)
• Port ID (1 byte)
• VLAN ID (2 bytes)
• System name (up to 32 bytes, this is optional)
30.4.2 Configuring DHCP Relay
Configure DHCP relay in the DHCP Relay screen. Click IP Application , DHCP in the
navigation panel and click the Relay link to display the screen as shown.
Figure 104 DHCP: Relay
The following table describes the labels in this screen.
Table 77 DHCP: Relay
LABEL DESCRIPTION
Active Select this check box to enable DHCP relay.
Remote DHCP
Server 1 .. 3
Enter the IP address of a DHCP server in dotted decimal notation.
Relay Agent
Information
Select the Option 82 check box to have the switch add information (slot number, port
number and VLAN ID) to client DHCP requests that it relays to a DHCP server.
Information This read-only field displays the system name you configure in the General Setup
screen.
Select the check box for the switch to add the system name to the client DHCP
requests that it relays to a DHCP server.