In DHCP Manager, select Modify from the Service menu.
The Modify Service Options dialog box opens.
See How to Start and Stop DHCP Manager for information about DHCP Manager.
In the BOOTP Compatibility section of the dialog box, select Automatic.
Select Restart Server, and click OK.
Select the Addresses tab.
Select addresses that you want to reserve for BOOTP clients.
Select a range of addresses by clicking the first address, pressing the Shift key, and clicking the last address. Select multiple nonconcurrent addresses by pressing the Control key while clicking each address.
Select Properties from the Edit menu.
The Modify Multiple Addresses dialog box opens.
In the BOOTP section, select Assign All Addresses Only to BOOTP Clients.
All other options should be set to Keep Current Settings.
Any BOOTP client can now obtain an address from this DHCP server.