System > Dhcp Relay > Dhcp Relay Interface Settings; System > Dhcp Local Relay Settings - D-Link DGS-1210 Series Manual

4 Web-based Switch Configuration
Disabled - If the field is toggled to Disabled the relay agent will not insert and remove DHCP relay
information (option 82 field) in messages between DHCP servers and clients, and the check and
policy settings will have no effect.
DHCP Relay Agent Information Option 82 Check: This field can be toggled between Enabled and
Disabled using the pull-down menu. It is used to enable or disable the Switches ability to check the validity of
the packet's option 82.
Enabled – When the field is toggled to Enabled, the relay agent will check the validity of the packet's
option 82 fields. If the switch receives a packet that contains the option-82 field from a DHCP client,
the switch drops the packet because it is invalid. In packets received from DHCP servers, the relay
agent will drop invalid messages.
Disabled - When the field is toggled to Disabled, the relay agent will not check the validity of the
packet's option 82 fields.
DHCP Relay Agent Information Option 82 Policy: This field can be toggled between Replace, Drop, and
Keep by using the pull-down menu. It is used to set the Switches policy for handling packets when the DHCP
Agent Information Option 82 Check is set to Disabled. The default is Replace.
Replace - The option 82 field will be replaced if the option 82 field already exists in the packet
received from the DHCP client.
Drop - The packet will be dropped if the option 82 field already exists in the packet received from the
DHCP client.
Keep -The option 82 field will be retained if the option 82 field already exists in the packet received
from the DHCP client.
DHCP Relay Agent Information Option 82 Remote ID: This field can be toggled between Default and User
Define.
System > DHCP Relay > DHCP Relay Interface Settings
This page allows the user to identify the DHCP server IP address(es). The relay agent interface is
permanently fixed as Interface "System".
Interface: The IP interface on the Switch that will be connected directly to the Server.
Server IP: Enter the IP address of the DHCP server. Up to four server IPs can be configured per IP Interface.
Click Apply to implement changes made.
System > DHCP Local Relay Settings
Switch acts as DHCP relay agent within a LAN (VLAN) when DHCP Local Relay enabled. DHCP broadcasts
are trapped and replaced by switch. Furthermore, DHCP Option 82 would be inserted to hosts origin DHCP
packets.
Figure 4.37 – System > DHCP Relay > DHCP Relay Interface Settings
Figure 4.38 - System > DHCP Local Relay Settings
D-Link Smart Managed Switch User Manual
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