Select Modify from the Service menu.
The Modify Service Options dialog box opens.
In the BOOTP Compatibility section of the dialog box, select Automatic.
Select Restart Server, if it is not already selected.
Select the Addresses tab in DHCP Manager.
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 non-concurrent 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.