3Com SuperStack 4 Configuration Manual page 86

98 C 5: N
HAPTER ETWORK
Displaying and
Debugging DHCP
Configuration
P O
ROTOCOL PERATION
Configuring the User Address Entry for the DHCP Server Group
To ensure that a valid user with a fixed IP address in a VLAN configured with DHCP
Relay passes the address validity check of the DHCP security feature, you must add
a static address entry which indicates the correspondence between an IP address
and a MAC address.
If an illegal user configures a static IP address which is in conflict with the fixed IP
address of a valid user, the Switch with DHCP Relay function enabled can identify
the valid user and reject the illegal user's request to bind the IP address with the
MAC address.
Perform the following configuration in System View..
Table 92 Configuring the User Address Entry for the DHCP Server Group
Operation
Configure user address entry
for DHCP server group
Delete the user address entry
in the DHCP server group
Enabling/Disabling the DHCP Security Feature on the VLAN interface
Enabling DHCP security features will start the address validity check on the VLAN
interface; disabling DHCP security features will cancel the address validity check.
Perform the following configuration in VLAN Interface View.
Table 93 Enabling/Disabling DHCP Security Feature on the VLAN Interface
Operation
Enable DHCP security feature on VLAN interface
Disable DHCP security feature on VLAN interface
By default, the DHCP security feature is disabled on the VLAN interface.
After the above configuration, enter the
the running of the DHCP configuration, and to verify the effect of the
configuration. Enter the
configuration.
Table 94 Displaying and Debugging DHCP Configuration
Operation
Display configuration information of DHCP
server group
Display configuration information about the
DHCP Server group corresponding to the
VLAN interface
Display all address information of the valid
user address table for the DHCP server group
Display address allocation information of
DHCP client
Enable/disable DHCP client debugging
Command
dhcp-security static
undo dhcp-security {
static }
display
command in User View to debug DHCP
debugging
Command
display dhcp-server groupNo
display dhcp-server interface
vlan-interface
display dhcp-security [
ip_address
unit
display dhcp client [ verbose ]
[ undo ] debugging dhcp client {
all | error | event | packet }
ip_address mac_address
| all | dynamic |
ip_address
Command
address-check enable
address-check disable
command in any view to display
vlan_id
| dynamic | static ] [
unit_id ]