Configuring A Dhcp Client Id For An Interface; Enabling Duplicated Address Detection - HP 6125XLG Configuration Manual

Configuring a DHCP client ID for an interface

A DHCP client ID is added to the DHCP option 61. A DHCP server can specify IP addresses for specified
clients based on the DHCP client ID.
Make sure the IDs for different DHCP clients are unique.
To configure a DHCP client ID for an interface:
Step
1. Enter system view.
2. Enter interface view.
3. Configure a DHCP client ID
for the interface.
4. Verify the client ID
configuration.

Enabling duplicated address detection

DHCP client detects IP address conflict through ARP packets. An attacker can act as the IP address owner
to send an ARP reply, making the client unable to use the IP address assigned by the server. HP
recommends you to disable duplicate address detection when ARP attacks exist on the network.
To enable duplicated address detection:
Step
1. Enter system view.
2. Enable duplicate address
detection.
Command
system-view
interface interface-type
interface-number
dhcp client identifier { ascii string |
hex string | mac interface-type
interface-number }
display dhcp client [ verbose ]
[ interface interface-type
interface-number ]
Command
system-view
dhcp client dad enable
60
Remarks
N/A
N/A
By default, an interface generates
the DHCP client ID based on its
MAC address. If the interface has
no MAC address, it uses the MAC
address of the first Ethernet
interface to generate its client ID.
DHCP client ID includes ID type
and type value. Each ID type has a
fixed type value. You can check the
fields for the client ID to verify
which type of client ID is used:
•
If an ASCII string is used as the
client ID, the type value is 00.
•
If a hex string is used as the
client ID, the type value is the
first two characters in the string.
•
If the MAC address of a specific
interface is used as the client
ID, the type value is 01.
Remarks
N/A
By default, the duplicate address
detection feature is enabled on an
interface.