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Tech Tips / Windows NT / Networking

Do you have a reservation for that MAC?

We are the first to admit that DHCP has been the answer to many a beleaguered NT administrator. No more coffee-stained pages falling from the rubber band-bound clipboard. But how do you deal with those situations when certain machines must have certain IP addresses? Simply configure a reservation in your DHCP scope! Here's how:

1. At a command prompt, type ipconfig /all and look for the line like this:

      Physical Address. . . . . . : 00-60-97-A4-20-86

   This is your network card hardware address, often referred to as a MAC address.


2. Now, at the DHCP server, log on as an Administrator.
3. Start the DHCP Server management software via Start | Programs | Administrative Tools (Common) | DHCP Manager.
4. Double-click the DHCP server.
5. Select the light bulb icon and, from the Scope menu, select Add Reservations.
6. In the Add Reserved Clients dialog box, enter the IP address you wish to reserve, and in the Unique Identifier field enter the hardware address of the client machine (from ipconfig /all). Do not enter the hyphens (e.g., 006097A42086). Also enter a name for the machine (and a comment if you wish) and click Add.
7. Click close when you have added all reservations.

You're now set to let DHCP handle it all!