Dhcp/Bootp Relay Settings; Dhcp Relay Option 82 Settings - D-Link DES-6500 - Switch User Manual

DHCP/BOOTP Relay Settings

The DHCP/ BOOTP Relay Settings allow the user to set up a server, by IP address, for relaying DHCP / BOOTP information to
the Switch. The user may enter a previously configured IP interface on the Switch that will be connected directly to the
DHCP/BOOTP server using the following window. Properly configured settings will be displayed in the BOOTP Relay Table at
the bottom of the following window, once the user clicks the Add button under the Apply heading. The user may add up to four
server IPs per IP interface on the Switch. Entries may be deleted by clicking it's corresponding
Figure 6- 167. DHCP/BOOTP Relay Interface Settings and DHCP/BOOTP Relay Interface Table window
The following parameters may be configured or viewed.
Parameter
Interface Name
IP Address

DHCP Relay Option 82 Settings

DHCP clients hold basic information for clients on the network. To get this information, servers send out packets holding BOOTP
information necessary for the Switch and its functionality. Yet, there are times DHCP servers and clients do not reside on the
same physical subnet and therefore the transfer of this information becomes more difficult. To ease the flow of this information,
the Switch can now act as a DHCP Relay agent. When the relay agent receives the DHCP request, it adds the option configuration
information, and the IP address of the relay agent (if the relay agent is configured), to the packet. Once the option information has
been added to the packet, it is sent on to the DHCP server. Upon receiving the packet, if the server is capable of processing the
option configuration information, it can implement policies like restricting the number of IP addresses that can be assigned to a
single remote ID or circuit ID. Once processed, the DHCP server echoes the option field in the DHCP reply. The DHCP server
unicasts the reply back to the relay agent if the request was relayed to the server by the relay agent. The Switch then verifies that it
originally inserted the option data. Finally, the relay agent removes the option field and forwards the packet to the switch port that
is connected to the DHCP client that sent the DHCP request.
The following fields can be set:
xStack DES-6500 Modular Layer 3 Chassis Ethernet Switch User Manual
Description
The IP interface on the Switch that will be connected directly to the Server.
Enter the IP address of the DHCP/BOOTP server. Up to four server IPs can be configured
per IP interface
Figure 6- 168. DHCP Relay Option Settings
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