ZyXEL Communications NetAtlas Workgroup - Manual (Page 176)

NetAtlas Workgroup Ethernet Switch Manager User’s Guide
Chapter 18 IP Configuration 176
18.5.3 Configuring DHCP Relay
Configure DHCP relay on the switch if the DHCP clients and the DHCP server are not in the
same subnet. During the initial IP address leasing, the switch helps to relay network
information (such as the IP address and subnet mask) between a DHCP client and a DHCP
server. Once the DHCP client obtains an IP address and can connect to the network, network
information renewal is done between the DHCP client and the DHCP server without the help
of the switch.
18.5.3.1 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)
Follow the steps below to set the switch as a DHCP server.
1 In the Device Panel list, right-click on a device.
2 Click Configuration > IP Configuration > DHCP.
3 Select Relay.
Primary/
Secondary
DNS Server
Enter the IP addresses of the DNS servers. The DNS servers are passed to the
DHCP clients along with the IP address and the subnet mask.
Add Click Add to save the changes and close this screen.
Cancel Click Cancel to discard all changes and close this screen.
Table 94 IP Configuration: DHCP: Server: New (continued)
LABEL DESCRIPTION