"unsetting" global options for a host

[perl-list]

If you setup two classes. One for everyone else and one for the printer and other devices that you need special options for, you can do this. I bet you can't unset an option, however. There should be a way to match everything for one class. Matching for the other class (the one with the printer) could be done by mac address. Then you could set options as needed in each class. That way the options are never global. 

----- Original Message -----

> From: "Rick Coloccia" <coloccia at geneseo.edu>
> To: dhcp-users at lists.isc.org
> Sent: Monday, January 30, 2012 12:16:10 PM
> Subject: "unsetting" global options for a host

> Hello,

> The message below went out to the list in April 2010. I need to do
> the
> exact same thing, albeit for a slightly different reason. I need to
> set
> a global "filename" option for netbooting most hosts, but we have
> some
> hosts that need to netboot but not receive a filename option at all
> from
> the dhcp server.

> As far as I can see by searching the list archives, no one responded.
> Is this not possible? Thoughts? Thanks, folks!!

> I am running Internet Systems Consortium DHCP Server V3.1.2b1 on
> CentOS
> release 5.7 running this kernel: 2.6.18-238.12.1.el5PAE #1 SMP.

> -Rick

> Is it possible to locally (at host declaration level) "unset" or
> "undefine" a general (top-level) option?

> We've got a broken printer which can't handle the provided
> netbios-scope information properly.

> So I'd like to override our netbios globally-set options: not by
> setting a different value, but by
> deleting or unsetting the options. So that this host won't get that
> options, as if they had never
> been set.

> We are running version 3.1.1-7.12 on SLES 11

> Thanks in advance and best regards,

> Luis Hernandez

> --
> Rick Coloccia, Jr.
> Network Manager
> State University of NY College at Geneseo
> 1 College Circle, 119 South Hall
> Geneseo, NY 14454
> V: 585-245-5577
> F: 585-245-5579

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