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valve; it's a better idea, though, to be careful about which options you assign if your server
manages multiple scopes.
Scope Options If you want a particular option value assigned only to those clients in a
certain subnet, you should assign it as a scope option . For example, it's common to specify
different routers for different physical subnets; if you have two scopes corresponding to
different subnets, each scope would probably have a separate value for the router option.
Class Options You can assign different options to clients of different types, that is,
class options . For example, Windows 2000, XP, Vista, Windows 7, Windows 8, Server
2003, Server 2003 R2, Server 2008, Server 2008 R2, and Server 2012/2012 R2 machines
recognize a number of DHCP options that Windows 98, Windows NT, and Mac OS
machines ignore, and vice versa. By defining a Windows 2000 or newer class (using the
ipconfig /setclassid command you saw earlier), you could assign those options only to
machines that report themselves as being in that class.
Client Options If a client is using DHCP reservations, you can assign certain options to
that specific client. You attach client options to a particular reservation. Client options
override scope, server, and class options. The only way to override a client option is to
configure the client manually. The DHCP server manages client options.
Client options override class options, class options override scope options,
and scope options override server options.
Assigning Options
You can use the DHCP snap-in to assign options at the scope, server, reserved address, or
class level. The mechanism you use to assign these options is the same for each; the only
difference is where you set the options.
When you create an option assignment, remember that it applies to all of the clients in
the server or the scope from that point forward. Option assignments aren't retroactive, and
they don't migrate from one scope to another.
Creating and Assigning a New Option
To create a new option and have it assigned, follow these steps:
1.
Select the scope or server where you want the option assigned.
2.
Select the corresponding Options node and choose Action Configure Options.
To set options for a reserved client, right-click its entry in the Reservations node and
select Configure Options.
Then you'll see the Scope Options dialog box (see Figure 2.40), which lists all of the
options that you might want to configure.
3.
To select an individual option, check the box next to it and then use the controls in the
Data Entry control group to enter the value you want associated with the option.
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