Using Dhcp Relay Agent Option 82 Information - Juniper ACX1000 Configuration Manual

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Using DHCP Relay Agent Option 82 Information

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user@host# edit interface fe-1/0/1.2
Specify that you want to configure overrides.
3.
[edit forwarding-options dhcp-relay group boston interface fe-1/0/1.2]
user@host# edit overrides
Disable automatic binding on the interface.
4.
[edit forwarding-options dhcp-relay group boston interface fe-1/0/1.2 overrides]
user@host# set no-bind-on-request
Extended DHCP Relay Agent Overview
Overriding the Default DHCP Relay Configuration Settings on page 373
Subscriber management enables you to configure the DHCP relay agent to include
additional option 82 information in the DHCP packets that the relay agent receives from
clients and forwards to a DHCP server. The DHCP server uses the additional information
to determine the IP address to assign to the client. The server might also use the
information for other purposes—for example, to determine which services to grant the
client, or to provide additional security against threats such as address spoofing. The
DHCP server sends its reply back to the DHCP relay agent, and the agent removes the
option 82 information from the message and forwards the packet to the client.
To configure support for the DHCP relay agent information option 82, you use the
statement. You can configure the DHCP relay agent to include the
relay-option-82
following suboptions in the packet the relay agent sends to the DHCP server:
Agent Circuit ID (suboption 1)—An ASCII string that identifies the interface on which
the client DHCP packet is received.
Agent Remote ID (suboption 2)—An ASCII string assigned by the DHCP relay agent
that securely identifies the client.
You can configure the option 82 support globally or for a named group of interfaces.
To restore the default behavior, in which option 82 information is not inserted into DHCP
packets, you use the delete relay-option-82
Chapter 11: Configuring DHCP and DHCPv6 Relay Agent
statement.
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