Posted by arlene

Many options that can be used for BOOTP and DHCP clients were discussed. The Windows 2000/2003 DHCP service enables you to configure which options will be offered to clients of the service. To configure the options, expand the MMC tree of DHCP servers to locate the server you want to manage. Click that server to get to the Options Folder for that server. After you have highlighted the Options Folder, click the Action menu.

From the Action menu, select Configure Options. You can see the default dialog box used for configuring options. Note that this dialog box has a General and an Advanced tab.

You can configure the options that the server can present to clients using this dialog box.

The Advanced tab enables you to more precisely control the options that are offered to clients.

Because the server enables you to specify options for several levels, it is important to understand the precedence used to decide which options apply to a client. Options can be set for the following, and in this order:

• Global Options—These are the server’s global options. These options apply to all scopes, unless superceded by the following options.
• Scope Options—These apply to a scope the client uses. Options in this class that conflict with server global options will supercede them.
• Class Options—These apply to clients that are members of the class. Options in a class will supercede server global options and class options.
• Reserved Client Options—By assigning options to a particular client for which an IP address reservation has been created, you are given the finest granularity of control. Options defined for a reserved client address override all other options.

Similarly, you can configure options for a scope if you did not do so during the initial creation of the scope. You also can use these same steps to change or add options to the scope. To change the options for a scope, expand the scope and select the Scope Options folder.

Option Classes

The list of Available Options is the list of options that are defined for the current DHCP server, and they are mostly the same options you’ll find in RFC 2132. Note that although the server can offer all these options, not all Microsoft clients can use this entire set of options, which is why the wizard prompted you for only a few options when it allowed you to select options for the newly created scope.

The Advanced tab enables you to look at the different classes of objects. You’ll see a vendor class and a user class. Vendor classes are groupings of options that are useful for a particular vendor’s client, such as Microsoft 98 or Windows NT clients. User classes are for grouping options that a particular class of users has in common; for example, BOOTP clients or Remote Access users.

If you define options for the server, the scopes you create will inherit them. A good place to start is to define the basic subset of options that all clients will need, if you have such a list, and configure these options for the server. Next, you can expand the particular scope and select the Scope Options folder to add or remove options that apply to a particular scope.

Superscopes

In the earlier example, only one scope of addresses was created on the DHCP server. The server is capable of handling additional address scopes, however, to provide for other clients that might be physically accessible to the DHCP server but use a different logical subnet address. To create a super- scope, you first must create the scopes to be included in it. Use the same procedures as before to create the new scope, specifying its address range, options, and so on. Next, select New Superscope from the Action menu. A wizard pops up and again prompts you through the process:

1. Click the Next button to dismiss the wizard’s opening dialog box.
2. In the next dialog box, give your superscope a name and click Next.
3. Select the scopes that will fall under this superscope. Use Shift+click and Ctrl+click to select one or more scopes from the list. Click Next.
4. Finally, the wizard shows you a summary of your superscope, including the name and the names of the scopes that make it up. Click the Finish button.

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