This article was previously published under Q139904
The following information is supplied to help explain what the DynamicHost Configuration Protocol (DHCP) is, how to configure the DHCP serverand enable a Windows NT as well as Windows for Workgroups DHCP client.
Implementing DHCP eliminates some of the configuration problems associatedwith manually configuring TCP/IP. DHCP centralizes TCP/IP configurationsand manages the allocation of TCP/IP configuration information byautomatically assigning IP addresses to computers configured to use DHCP.
The following requirements need to be met by the DHCP server:
The DHCP server service is running on a Windows NT Server on at least one computer within the TCP/IP internetwork.
NOTE: Your IP routers must support RFC 1542, otherwise you need a DHCP server or a DHCP Relay agent on each subnet.
A DHCP scope exists on the DHCP server.
A DHCP scope consists of a pool of IP addresses the DHCP server can assign or lease to DHCP clients. For example:
xxx.107.3.51 through xxx.107.3.200
where xxx is any valid number for the first octet of the IP address.
The following requirements need to be met by the DHCP client:
The client computer has a DHCP supported operating system. The following operating systems are capable of being a DHCP client with DHCP enabled at the client:
- Windows NT Server 3.5, 3.51, and 4.0 - Windows NT Workstation 3.5, 3.51, and 4.0 - Windows 95 - Windows for Workgroups 3.11 with the Microsoft TCP/IP-32 for Windows for Workgroups installed - MS Network Client 3.0 for MS-DOS with the real mode TCP/IP driver installed - LAN Manager 2.2c
Installing the DHCP Server Service
Prior to installing the DHCP service, you must log on as administratorfrom the primary domain controller. To install the DHCP Server service,follow these steps:
Run Control Panel and choose Network.
Choose Add Software.
In the Add Network Software dialog box, select TCP/IP Protocol And Related Components, and then choose Continue.
The Windows NT TCP/IP Installation Options dialog box appears, displaying the TCP/IP components available to be installed.
Select DHCP Server Service, and then choose Continue.
The Windows NT setup box appears, prompting you for the full path of the Windows NT distribution files.
NOTE: You may be prompted with the following message:
At least one of your adapters has automatic DHCP configuration enabled. In order to correctly install the DHCP server, setup will disable automatic DHCP configuration. Are you sure you want to install the DHCP Server?
Type the path to the location of Windows NT Server distribution files, and choose Continue.
If you install from compact disc, the path is under the \I386 directory.
The TCP/IP configuration Box appears.
Enter the static IP address of the DHCP Server as well as the subnet mask and the default gateway. If you use Windows Internet Name Service (WINS), add the primary and secondary WINS addresses here.
The appropriate files are copied to your server, and then the Network Settings dialog box appears.
A Network Settings Change dialog box appears, indicating that the system must be restarted to initialize the new configuration.
Save any unsaved work in other windows and choose Restart Now to restart Windows NT Server.
Log on as Administrator.
Configuring a DHCP Scope
Be sure to install and initialize the DHCP Server before completing thenext step.
To configure the DHCP scope, you must log on as administrator. Configuringthe DHCP scope supplies the DHCP client with the range of IP addresses fromwhich the server draws from and a subnet mask to be assigned to clients.
The DHCP Server provides:
Default gateway address
Service server addresses
WINS server addresses
NETBIOS name resolution type.
For additional information, please see the following article(s) in theMicrosoft Knowledge Base:
ARTICLE-ID: 121005 TITLE : DHCP Options Supported by Clients
From the Network Administration group, start DHCP Manager.
The DHCP Manager window appears.
Under DHCP Servers, select *Local Machine*
Local Machine indicates that you are configuring the local DHCP server, and not a remote DHCP server.
From the Scope menu, choose Create.
The Create Scope dialog box appears.
Complete the scope configuration.
The DHCP server cannot be a DHCP client. It must have a static IP address, subnet mask, and default gateway address. You also have the option of assigning an exclusion range or specific excluded addresses as well as lease duration and a name.
Choose OK when done.
Choose Yes to activate the scope.
The DHCP Manager window appears with the new scope added. Notice the yellow light bulb next to the IP address. This indicates an active scope.
Close the DHCP Manager.
Enabling DHCP at the Client
To enable the Windows NT DHCP client, you must log on as administrator atthe Windows NT client.
Normally, you enable DHCP as part of the installation procedurefor Microsoft TCP/IP, however, you can use this procedure if you havemanually configured TCP/IP:
Run Control Panel and choose Network.
The Network Settings dialog box appears.
Under Installed Network Software, select TCP/IP Protocol and then choose configure.
The TCP/IP configuration dialog box appears.
Select Enable Automatic DHCP Configuration.
A Microsoft (MS) TCP/IP message appears, indicating that the DHCP Protocol attempts to configure the server automatically during system initialization.
A MS TCP/IP Configuration dialog box appears, displaying current TCP/IP configuration parameters. The IP Address and Subnet Mask boxes are not available (grayed out) and the manually configured values are no longer displayed.
Choose OK to return to the Network Settings dialog box.
Choose OK again.
Shut down and restart the computer.
To enable DHCP on a Windows for Workgroups client if TCP/IP is notinstalled yet:
Use Network Setup to install the MS TCP/IP-32 3.11 protocol.
In the MS TCP/IP Configuration dialog box, select the Enable Automatic DHCP Configuration check box, and choose Continue.
Restart the computer to initialize TCP/IP using DHCP.
To enable DHCP on a Windows for Workgroups client if TCP/IP is installed:
To access the Network Drivers dialog box, run Network Setup.
Select Microsoft TCP/IP-32 3.11, and then choose Setup.
In the MS TCP/IP Configuration dialog box, select the Enable Automatic DHCP Configuration check box, and choose continue.
A message box appears indicating that the configuration of DHCP overrides any values established locally.
To initialize TCP/IP using DHCP information, restart the computer.