In DHCP Manager, select the Addresses tab.
See How to Start and Stop DHCP Manager for information about DHCP Manager.
Select the appropriate network.
Double-click the IP address that you want to the client to use.
The Address Properties window opens.
Select the Lease tab.
In the Client ID field, type the client ID.
The client ID is derived from the client's hardware address. See the Client ID entry in Table 15–4 for more information.
Select the Reserved option to prevent the IP address from being reclaimed by the server.
In the Lease Policy area of the window, select Dynamic or Permanent assignment.
Select Dynamic if you want the client to negotiate to renew leases, which enables you to track when the address is used. Because you selected Reserved, the address cannot be reclaimed even when a dynamic lease is assigned. You do not need to specify an expiration date for this lease. The DHCP server calculates the expiration date by using the lease time.
If you select Permanent, you cannot track the use of the IP address unless you enable transaction logging.