Option negation

[John Hascall]

Thanks for your reply.

John
PS, ISC, that's bogus.

On Wed, May 4, 2016 at 1:20 AM, Glenn Satchell <glenn.satchell at uniq.com.au>
wrote:

> This topic comes up from time to time. Unfortunately there is no way to
> remove an option. The best you can currently do is set it to a null or
> empty string, but this is not the same as not sending the option.
>
> regards,
> -glenn
>
> On Wed, May 4, 2016 6:11 am, John Hascall wrote:
> > I know that options set in more specific scopes override those set in
> less
> > specific scopes, but can I "undo" an option setting?  That is, lets
> > imagine
> > I have this:
> >
> > option option-66 code 66 = text;
> >
> >
> > and then in a class scope, I have:
> >
> > class "someclass" {
> > ​​
> > ​        ​
> > match substring(hardware, 1, 3);
> > ​        ​
> >
> > *option option-66 "blah blah blah";*}
> > subclass "
> > ​someclass
> > " 00:0
> > ​1​
> > :
> > ​02​
> > ;
> >
> >
> > I know that, given that host whatever falls in that class scope, that:
> >
> > host whatever {
> >
> > ​        hardware ethernet 00:01:02:03:04:05;​
> >
> > ​
> > *option option-66 "fe fi fo fum";*
> > }
> >
> >
> > works
> > ​ to change its option​
> > , but what if
> > ​I ​
> > want *host whatever* not to get
> > ​ that option at all?  How do I do that???
> >
> > host whatever {
> > ​        ​
> > hardware ethernet 00:01:02:03:04:05;​
> >
> >         *no option​ option-66;       <== just making this up*
> > }
> >
> >
> > ​Many Thanks!
> > John​
> > _______________________________________________
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> > dhcp-users at lists.isc.org
> > https://lists.isc.org/mailman/listinfo/dhcp-users
>
>
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