DHCP Options

  • Thread starter Thread starter Rich Magowan
  • Start date Start date
R

Rich Magowan

I had to create a new option numbered 176. This option has
to do with IP telephony. I built the option as a GLOBAL
option. It is a string type option. At the global level, I
select this option for all scopes, like a DNS server type
option. Is this OK? If a client machine like a PC comes
up, it doesn't care that there is an option defined that
it has no knowledge about, is that correct? I've done some
release/renews and don't see any problems. Is this the
correct way to set up new non-standard options for DHCP to
hand out?
Thanks for any and all advise.
 
Rich,

If a computer gets an option from the DHCP server that it has no knowledge
about it will just ignore it. However it is best practice if you want to
apply some settings only to some PCs to make use of User Classes. Define a
use class and assign the clients you want that class. Then make the option
changes for that class only. This way everything is "cleaner".

Cheers,
AT
 
How does this user class work? How does one assign unknown
clients to a particular class? This setup I'm using has to
do with using VOIP phones in virtually any office in the
organization. I do understand what you're saying here,
what I don't understand is how to know what kind of client
I'm seeing issue the DHCP request. MAC address maybe ??
Thanks for the answer and your time.
Rich M.
 
Hi Rich,

After you define the User Class (To define the user class you need to open
DHCP mmc, right click the DHCP server and go to Define User Classes. Then
hit Add and give the User Class a display name and if you want a
description.Hit OK 2 times. Then go to Server Options and to Configure
Server Options, go to the Advanced tab, and from the User Class drop down
list select the User Class that you have earlier defined. From there is just
a matter of making the settings you want. Hit OK when you are done) you need
to assign the clients you want to receive these settings to the User Class
you have just defined. To assign the clients to the User Class go on each
local client and execute the following command: "ipconfig /setclassid "name
of the local network connection which in most cases is Local Area Network"
Name_of_the_user_class_you_defined ". So if your local network connection is
called Intranet and your user class is called UCVOIP then you command should
be something like: "ipconfig / setclassid intranet UCVOIP.

However for your best interest it is probably good to have a read of the
Microsoft white papers about DHCP. You can probably start here:
http://www.microsoft.com/windows2000/techinfo/howitworks/communications/name
adrmgmt/dhcp.asp but do not limit yourself there as there are heaps of white
papers from Microsoft about DHCP.

Cheers,
AT
 
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