Recipe14.8.Configuring Scope Options

Recipe 14.8. Configuring Scope Options

Problem

You want to configure scope options. While you want to configure as many options as possible at the server level, some options that are specific to a scope need to be configured within the scope. An example of this is the default router option (code 3) when you have multiple subnets and only one DHCP Server.

Solution

Using a graphical user interface

1. Open the DHCP snap-in.

2. In the left pane, right-click on DHCP and select Add Server.

3. Type in the name of the DHCP Server you want to target and click OK.

4. Expand the server entry in the left pane.

5. Expand the scope you want to set options for.

6. Click on the Scope Options icon. In the right pane, you will see the list of options currently configured for the scope. This will include any server options that have been configured.

7. To modify an option, double-click it in the right pane. To configure a new scope option, right-click on the Scope Options icon and select Configure Options.

8. Check the box beside the option you want to configure. This will make the Data entry section of the dialog box active.

9. Enter the value(s) for the option and click OK.

Using a command-line interface

The following command configures a scope option:

> netsh dhcp server \\<ServerName> scope <SubnetID> set optionvalue <OptCode> <DataType> <OptValue>

In this example, the "default router" option (code 3) is configured with a value of 192.168.10.1:

> netsh dhcp server \\dhcp01 scope 192.168.10.0 set optionvalue 3 IPADDRESS 192.168.10.1

You can view all of the scope options for a scope with this command:

> netsh dhcp server \\<ServerName> scope <SubnetID> show optionvalue

Using VBScript

See the Introduction for more information on how to run the netsh command from within a script.

Discussion

When a DHCP Server responds to a client request for a lease, the server also responds with any configured options for the scope. Options are nothing more than bits of configuration information, such as the servers to use for name resolution, the default domain name, default router, etc. Some options may be specific to a particular scope (for example, the default router for a subnet) or may be more global (such as the default domain name). The former are called scope options and the latter are called server options. I covered server options in Recipe 14.3.

See Also

Recipe 14.3