Dynamic Host Configuration Protocol (DHCP) provides automatic and dynamic IP addressing for clients. In DHCP, a reservation assigns a specific IP address to a specific media access control (MAC) address.

In other words, a DHCP reservation enables you to assign a specific IP address to a specific computer without any special configuration on the client. You must only create the reservation in DHCP and then configure the client to use DHCP.

To determine the MAC address of a target computer running Windows 2000, open a command console on the computer, and type IPCONFIG /ALL. The results list network configuration data for each interface, including the MAC address.

This command also works on Windows XP systems. For Windows 9x and Me systems, use the WINIPCFG utility on the client to determine MAC address.

Once you know the MAC address, follow these steps to create the reservation:

1. Open the DHCP console on the server. (Go to Start | Programs | Administrative Tools | DHCP.)

2. Open the scope where you want to create the reservation.

3. Right-click the Reservations branch, and choose New Reservation.

4. In the New Reservation dialog box, enter the MAC address of the client computer in the MAC Address text box.

5. In the IP Address text box, enter the desired IP address.

6. In the Reservation Name text box, enter a descriptive name for the reservation.

7. Under Supported Types, indicate whether DHCP clients, BOOTP clients, or both will support the reservation.

8. Click Add, and close all dialog boxes.

After creating the reservation, either reboot the client computer, or simply refresh its DHCP lease. For Windows 2000 and XP computers, enter IPCONFIG /RENEW at the command line. For Windows 9x and Me computers, use the WINIPCFG utility to renew the DHCP lease.