how respond only to specific clients

Glenn Satchell Glenn.Satchell at
Fri Jun 23 13:32:03 UTC 2006

>To: dhcp-users at
>Subject: Re: how respond only to specific clients
>From: Douglas Sterner <DSterner at>
>Date: Thu, 22 Jun 2006 14:15:34 -0400
>The workstation shows this: 
>        DHCP Class ID . . . . . . . . . . : Internal
>Ethereal is showing this as Option 77 User Class Information
>Is this correct?

Hi Douglas,

Then you want 'option user-class'. This is taken from dhcp-options man page:

     option user-class string;

       This option is used by some DHCP  clients  as  a  way  for
       users  to  specify  identifying information to the client.
       This can be used in a similar  way  to  the  vendor-class-
       identifier  option,  but the value of the option is speci-
       fied by the user,  not  the  vendor.    Most  recent  DHCP
       clients  have  a  way in the user interface to specify the
       value for this identifier, usually as a text string.

and your class becomes:

#192.168.40.X Network
class "Internal" {
   match if option user-class = "Internal";


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