Managing The Bootp/Dhcp Relay Agent - D-Link DWS-4026 User Manual

D-Link Unified Access System
M
ANAGING THE
BootP/DHCP Relay Agent enables BootP/DHCP clients and servers to exchange BootP/DHCP messages across different
subnets. The relay agent receives the requests from the clients, and checks the valid hops and giaddr fields. If the number
of hops is greater than the configured, the agent assumes the packet has looped through the agents and discards the packet.
If giaddr field is zero the agent must fill in this field with the IP address of the interface on which the request was received.
The agent unicasts the valid packets to the next configured destination. The server responds with a unicast BOOTREPLY
addressed to the relay agent closest to the client as indicated by giaddr field. Upon reception of the BOOTREPLY from the
server, the agent forwards this reply as broadcast or unicast on the interface that had received the BOOTREQUEST. This
interface can be identified by giaddr field.
The Unified Switch also supports DHCP relay agent options to identify the source circuit when customers are connected to
the Internet with high-speed modem. The relay agent inserts these options when forwarding the request to the server and
removes them when sending the reply to the clients.
If an interface has more than one IP address, the relay agent should use the primary IP address configured as its relay agent
IP address.
The following pages configure and display BOOTP/DHCP relay agent:
• "BOOTP/DHCP Relay Agent Configuration"
• "BOOTP/DHCP Relay Agent Status"
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Managing the BOOTP/DHCP Relay Agent

BOOTP/DHCP R A
ELAY GENT
Document 34CSFP6XXUWS-SWUM100-D7
Software User Manual
12/10/09