In DHCP Manager, choose Modify from the Service menu.
The Modify Service Options dialog box is displayed.
See How to Start and Stop DHCP Manager for information about DHCP Manager.
Select the Interfaces tab.
Select the appropriate network interface.
Click the arrow buttons to move the interface to the appropriate list.
For example, to ignore an interface, select the interface in the Monitored Interfaces list, and then click the right arrow button. The interface is then shown in the Ignored Interfaces list.
Select Restart Server, and click OK.
The changes you make persist across reboots.