The
idea is that you may wish a sub-set of computers to have a different default
gateway. Take the scenario where you have 6 directors who need
internet access and would like those machines to have different DHCP scope
options.
Now actually making your own User Class work is one of the most difficult
jobs in the whole of computing. So go slowly, and pay attention to detail,
in particular watch out for what needs configuring on the server, and when to
run IPCONFIG on the clients.
Learn more about DHCP. As an MCT trainer, I can thoroughly recommend TrainSignal
because they provide practical hands on training. In particular, I like the way TrainSignal cover all learning methods, instructor lead, video and of course text
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See more about DHCP here
User Classes - Configuration
1) Create your User Class. Right click the DHCP server option, select
Define User Classes from the short cut menu.
2)
Add your chosen User Class. The trick is to get rid of the dot under ASCI
and add a name that you will use for this special User Class. For example,
Director.
3) Remember to create the special options for example, a new Default Gateway.
To do this choose the advance tab on the Options.
4) Now we switch our attention to the clients. The key is to tell the
clients which User Class they belong to.
IPCONFIG /setclassid director, would be the answer in for our example.
In 'real life' I would use a logon script to set this command, your average
user would not be able to remember this command.
5) Test your /setclassid with IPCONFIG / all or IPCONFIG /showclassid
I have one 'killer use' for Predefined options, to set the WPAD (Web Proxy
Auto Detect)
for XP clients. However, I am sure that there will be more uses for
Predefined options in the next few years.
Now you could set the ISA server Proxy with a group policy, but it may be
easier to control via a DHCP option.
From the DHCP server icon, select: Set Predefined Options. (See Diagram 1)
The crucial button is the: Add. Next, in the Name box, enter
WPAD
Change the Data Type box to: String.
In the Code box, type: 252.
Crucial point, press enter.
Important: In the Predefined Option and Values dialog box, type
http:// ISA-yourServer: 80 /wpad.dat in the box
Note : 80 is the default port of the ISA AutoDiscovery service
Creating the server and client side of the DHCP User Classes is one of the
most challenging and satisfying configuration tasks. Keep you eye out for
Predefined options like WPAD 252, where you can automatically set the ISA proxy
server for your DHCP clients.
