Enabling Duplicated Address Detection; Setting The Dscp Value For Dhcp Packets Sent By The Dhcp Client; Displaying And Maintaining The Dhcp Client - HP FlexNetwork MSR2003 Configuration Manual

Step
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. The spoofing attack makes the client unable to use the IP address
assigned by the server. As a best practice, 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.
Setting the DSCP value for DHCP packets sent by
the DHCP client
The DSCP value of a packet specifies the priority level of the packet and affects the transmission
priority of the packet.
To set the DSCP value for DHCP packets sent by the DHCP client:
Step
1. Enter system view.
2. Set the DSCP value for DHCP
packets sent by the DHCP
client.

Displaying and maintaining the DHCP client

Execute display command in any view.
Command
display dhcp client
[ verbose ] [ interface
interface-type
interface-number ]
Command
system-view
dhcp client dad enable
Command
system-view
dhcp client dscp
dscp-value
79
Remarks
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 an 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.
Remarks
N/A
By default, the DSCP value in DHCP
packets sent by the DHCP client is 56.