Best practice on removing IP Scopes(subnets)

[John Hascall]

> >To: Users of ISC DHCP <dhcp-users at lists.isc.org>
> >Subject: Re: Best practice on removing IP Scopes(subnets) 
> >Date: Fri, 24 Apr 2009 11:54:35 CDT
> >From: John Hascall <john at iastate.edu>
> >
> >Christof Chen writes:
> >> I just want to mention there is a fairly recent addition to DHCPD:
> >>     deny after TIME;
> >> in a pool shortens the lease duration automatically as TIME approaches.
> >> Together with a corresponding
> >>     allow after TIME;
> >> in a different pool this allows for a nearly automatic switchover at a
> >> preconfigured time.
> >
> >That's pretty swell, but what would really be awesome is
> >something which would allow renews, but not new offers
> >in a pool!
> >
> >Maybe allowing "deny booting" in pool scope could do that.
> >
> >Then you could very nicely switch from one pool to another.
> >
> >John
> 
> Note this is untested by me, but in theory something like this
> in the pool, or subnet might do this:
> 
> # 1 = DHCPDISCOVER
> if option dhcp-message-type = 1 {
> 	deny booting;
> }

According to the man page, at least, "deny booting" is valid
only in host scope.

John