Enabling Duplicated Address Detection; Setting The Dscp Value For Dhcp Packets Sent By The Dhcp Client - HP 6125XLG Layer 3-Ip Services Configuration Manual

Step
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.
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.
Command
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
Command
system-view
dhcp client dscp
dscp-value
65
Remarks
By default, an interface generates an ASCII
character string as the DHCP client ID based
on its MAC address and the interface name.
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.
Remarks
N/A
By default, the DSCP value in DHCP packets
sent by the DHCP client is 56.