Static IP and IP management

Bernard Fay bernard.fay at
Thu Feb 25 15:26:54 UTC 2016

I have to find out about this "reserved" thing. I don't understand it.
Google, please, help me!

On Wed, Feb 24, 2016 at 1:44 PM, Chuck Anderson <cra at> wrote:

> On Wed, Feb 24, 2016 at 01:17:13PM -0500, Bernard Fay wrote:
> > When the dhcpd server assign a static IP to a device, it also instruct
> bind
> > to add an entry in the DNS zone file.  One thing I realized is that if a
> > device didn't renew his lease, the entry in the DNS zone file is not
> > removed.  I would have thought to use the zone files to know if a device
> is
> > in use or not.  I had in mind that the lease time would have help to know
> > if a device therefore an IP is use or not.  In other words, a device
> > requires an IP and the dhcpd server assigned it a statically defined IP
> > address. The dhcpd server also instruct bind to add an entry in the
> > appropriate zone file.  Eventually the device is turned off, the lease
> time
> > reach its limit then I would have expected the dhcpd server to instruct
> > bind to remove the entry regarding this device but it is not the case.
> > Then I could have take a look at the zone files to know what is in used
> and
> > I would know what is not in use.
> >
> > Either I made something in my configuration or I was expecting too much
> > from dhcpd and bind.
> You can do that, but you have to use "reserved" leases rather than
> fixed-address statements.  ISC dhcpd doesn't track the expiry of
> fixed-address leases.
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