deny option to specific hosts

Glenn Satchell glenn.satchell at
Mon Aug 20 12:15:40 UTC 2012

As has been mentioned, there is no specific mention to unset an option.
However, with careful use of scoping you can often work around it.

So in this case we could do something like this:

host phone {
        hardware ethernet 00:1a:e8:03:99:a8;

subnet netmask {
        option routers;
        option broadcast-address;
        pool {
               option domain-name-servers;
               option ntp-servers;

A host statement inherits from the subnet scope, but not the pool scope.

This idea may not be able to be used in all cases, but hopefully you get
the idea.


On Mon, August 20, 2012 7:40 pm, mailsvb wrote:
> Hi everyone,
> I have a quick question regarding how to deny single options that have
> been
> declared for a scope to one single host?
> My config looks like this...
> subnet netmask {
> range;
> option routers;
> option broadcast-address;
> option domain-name-servers;
>         option ntp-servers;
>         host phone {
>              hardware ethernet 00:1a:e8:03:99:a8;
>              fixed-address;
>         }
> }
> So I now want the DHCP server to NOT SEND the options for NTP and DNS to
> the single host "phone"? How do I prevent them to get send?
> Thanks in advance for your help :-)
> Sven
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> dhcp-users mailing list
> dhcp-users at

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