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Configuring the DHCP Service with a Scope

The DHCP scope provides the range of IP addresses that the server can hand out to requesting DHCP clients. The DHCP server can’t function without a scope. The scope includes a start address (for the range of IP addresses) and an end address. IP address scopes may also include an exclusion range.

You may also want to exclude some of the IP addresses from the scope on computers that require static IP addresses (for example, your DHCP server requires a static IP address). Other devices on the network, such as routers and some printers (those directly connected to the network), also require static IP addresses, so the exclusion range that you specify might include a number of IP addresses. (Remember that this is supposed to be a range of addresses that are excluded, so pick a logical starting and stopping point in the address scope that is available.) Exclusion ranges are discussed later in this hour.

In the previous section, the installation of DHCP using the Add Roles Wizard provided an Add or Edit DHCP Scopes wizard screen (during the DCHP Server installation process). Figure 16.4 shows this screen. We pick up the DHCP installation by adding a new scope.

Figure 16.4. You must add a scope of IP addresses for the network.

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To continue the DHCP installation and configuration and add a new IP scope, follow these steps:

1. On the Add or Edit DHCP Scopes screen (see Figure 16.4), click Add. The Add Scope dialog box appears.

2. Enter the scope name, starting and ending IP address for the scope, the subnet mask, and the Subnet Type (see Figure 16.5). The subnet type is either Wired (with a lease duration of 6 days) or Wireless (lease duration of 8 hours).

Figure 16.5. Provide the parameters for your IP address scope.

3. You are asked to provide the range of IP addresses that are available in the Scope (see Figure 16.5). Enter the scope range (the beginning and ending IP addresses in the range). Also enter the subnet mask for the network and other parameters as needed (such as the default gateway). Click OK.

Did you Know?

For a scope to be available, the scope must be activated. Note that an Activate This Scope check box is provided in the Add Scope dialog box. You should leave this check box selected in most cases.

4. You can use the Add button to add additional scopes if necessary. When you have completed adding (or editing scopes), click Next to continue.

5. On the next screen, you are provided with the option of configuring the DHCPv6 mode for your network. You can use the stateless mode (which enables IPv6 clients to configure their own IP addresses without using the DHCP server) or you can disable the stateless mode and configure DHCPv6 using the DHCP snap-in. The default is the stateless mode (which automates IPv6 addressing; see the accompanying note). With the default mode selected, click Next.

By the Way

In terms of DHCPv6 addressing, the stateless mode provides the easiest route to getting computers and devices using TCP/IPv6 up and running on the network. TCP/IPv6-enabled devices (enabled in the network configuration for that computer or device) can obtain settings such as the DNS server addresses from the DHCPv6 stateless mode settings on the DHCP server. IPv6 addressing of these devices (when using the stateless mode) is a process that does not involve the DHCP server, and addresses are configured automatically based on information such as the IPv6 prefixes that are included in the router advertisements broadcast on your network.

6. On the next screen, provide the IPv6 DNS server settings. This includes the parent domain name, the preferred DNS Server IPv6 address, and optional alternate DNS server IPV6 address (IPV6 is discussed in more detail in Hour 7. Enter the appropriate addresses and then click Next.

Did you Know?

IPv6 stateless mode addresses are created, in part, from the MAC address of a computer’s network interface card. If you are using stateless mode for IPv6 addressing, you can find a computer’s IPv6 address by running the ipconfig/all command at the command prompt.

7. All DHCP servers in your Windows Server 2008 domain must be authorized with the Active Directory to be valid DHCP servers on the network. This screen requires that you provide credentials that authorize this DHCP server in the Active Directory Domain Services (see Figure 16.6). You can use the current credentials (if you are logged on with an account that has domain rights) or you can use the Use Alternate Credentials option button and then supply an account name and password that provides the appropriate credentials for authorization. (The best set would be the administrator account that you used to create the original forest.) Provide the credentials (if using alternate credentials) and then click Next.

Figure 16.6. You must authorize the DHCP server.

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By the Way

A DHCP server must be authorized because this negates the possibility of a rogue DHCP server on the network (for example, someone testing a DHCP server that is unknowingly connected to the network) assigning spurious IP addresses to your DHCP clients (which typically means that you get tons of support calls because everyone is having trouble getting at network resources).

8. The next screen provides a summary of the settings for your new DHCP server. Check the settings (you can use Previous to return to earlier screens to edit settings), and then click Install to complete the DHCP installation process).

The Installation Results screen appears, letting you know that the installation succeeded. Click Close. The DHCP Server role is now listed in the Initial Configuration Tasks window for the server (in the Customize This Server area) and also appears as a role in the Server Manager (see Figure 16.7). Events related to the DHCP server appear in the Events window when the DHCP Server node is selected.

Figure 16.7. The DHCP Server is now listed in the Server Manager roles.

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Now that the DHCP role has been added to the server, you can manage the new DHCP server using the DHCP snap-in, which runs in the MMC. Let’s take a look at the DHCP snap-in.

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