Instruction Manual
104
Viewing DHCP Rate Limit Settings
•
On the
DHCP Rate Limit Config
page, the following information will be
displayed:
•
Port Name:
Displays the name of the port the DHCP rate limit is applied to.
•
Rate Limit (pps):
Displays the packets per second rate limit.
Option82 Global Setting
DHCP Option82 is a relay mechanism for sending information about the switch
and its DHCP clients to DHCP servers. It allows compatible DHCP servers to use
the information when assigning IP addresses, or to set other services or policies
for clients. It is also an effective tool in preventing malicious network attacks from
attached clients on DHCP services, such as IP spoofing, client identifier spoofing,
MAC address spoofing, and address exhaustion.
The DHCP Option82 enables a DHCP relay agent to insert specific information
into a DHCP request packet when forwarding client DHCP packets to a DHCP
server, and remove the specific information from a DHCP reply packet when
forwarding server DHCP packets to a DHCP client. The DHCP server can use this
information to implement IP address or other assignment policies. Specifically
the option works by setting two sub-options:
•
Circuit ID (option 1):
The Circuit ID sub-option is supposed to include
information specific to which circuit the request came in on.
•
Remote ID (option 2):
The Remote ID sub-option was designed to carry
information relating to the remote host end of the circuit.
The definition of Circuit ID in the switch is 4 bytes in length and the format is
VLAN ID, Module ID and Port Number.
Configuring Option82 Global Setting
1.
On the
Option82 Global Setting
page, select the remote ID
State
(
Default
or
User Defined
):
•
Default:
Uses the default VLAN MAC format.
•
User Defined:
Uses user defined remote ID content.
2. Click the
Apply
button.
