R21xx-HP FlexFabric 11900 Layer 3 IP Services Configuration Guide

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Ste
p
Command Remarks
3. Configure a DHCP client ID
for the interface.
dhcp client identifier { ascii string |
hex string | mac interface-type
interface-number }
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.
4. Verify the client ID
configuration.
display dhcp client [ verbose ]
[ interface interface-type
interface-number ]
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.
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 that you disable duplicate address detection when ARP attacks exist on the network.
To enable duplicated address detection:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enable duplicate address
detection.
dhcp client dad enable
By default, the duplicate
address detection
feature is enabled on an
interface.
Displaying and maintaining the DHCP client
Execute display command in any view.
Task Command
Display DHCP client information.
display dhcp client [ verbose ] [ interface interface-type
interface-number ]