Enabling Duplicated Address Detection; Setting The Dscp Value For Dhcp Packets Sent By The Dhcp Client - H3C MSR 2600 Configuration Manual

Step
2. Enter interface view.
Configure a DHCP client
3.
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. H3C
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.
Command
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
Command
system-view
65
Remarks
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.
Remarks
N/A