Server Manager is your one-stop shop for adding roles to Windows Server 2008 such as DNS, DHCP, Active Directory.
Adding the DHCP role.
From the Start menu, select | Control Panel | Administrative Tools | Server Manager
Expand and click Roles
Choose Add Roles and follow the wizard by selecting the DHCP role
A new DHCP wizard appears to help you configure a DHCP server.
Choose your static IP addresses to service DHCP clients.
Let’s continue on through the wizard. Your network cards and static IP addresses are automatically detected and you can choose how DHCP will service clients on different subnets.
Enter your DNS server IP address
Here you can specify the applicable DNS server(s) to be used with DHCP when an address is assigned.
Creating a Scope
When you create a scope, you must select the range of IP addresses and you must specify the appropriate scope options to include. These options are what we were referring to above when we mentioned that you can assign other network information to your clients at the time they are given an IP address.
There are two types of scope options: Global and Scope. Global options are propagated to all the scopes that you create on that DHCP server, while Scope options are only for the individual scope that you are working with. For example, if you have different scopes for several different subnets and each subnet will have a different default gateway but will share the same DNS servers, you would want to set the DNS servers as a Global option while the default gateways would be set separately in each scope as a Scope option.
Adding/editing your Scopes
You can add multiple scopes before continuing the wizard
Enable IPv6 stateless mode
Authorizing the DHCP server and activating Scopes
In previous versions of Windows, you had to install and configure your DHCP server and then authorize it in the DHCP MMC snap-in. Authorizing your DHCP server allows you to prevent hackers from configuring rogue DHCP servers. In Windows Server 2008, you have the ability to either authorize the server in the Wizard or authorize it after the fact in the DHCP MMC-snap-in.
Reviewing your DHCP configuration
In addition to specifying exclusions, you can add reservations to your DHCP server. By adding a reservation, you ensure that a machine always receives the same IP address from the DHCP server.
Right-click on Reservations and choose new reservation.
Enter a friendly name for the reservation and the IP address you want to assign to the computer or device.
Enter the MAC address of the computer or device. (For Windows machines, you can find the MAC address by running ipconfig/all from the command prompt of the machine.)
Enter a description and then choose the following reservation type: DHCP, BOOTP (going across a router), or both.
In addition to specifying reservations, you can add exclusions to your DHCP server. By adding exclusions, you ensure that machines never receive a DHCP lease for that range of IP addresses. This is very useful to block IP addresses for your servers and routers.