DHCP Reservation behaviour

Hi

I've looked at this group and didn't found any specific article about my
doubt, but I'm a human and can make some mistakes.
Well, what happens with the printers, workstations, devices which are
served by an IP from a reservation if has a lack of DHCP service?
They lost their IPs and become uninstable or they still working without any
problems until the service becomes available, or we have a "gap" which
determines how long they can work without the DHCP service?

Thanks

"Marcelo Moraes" wrote:

> Hi
>
> I've looked at this group and didn't found any specific article about my
> doubt, but I'm a human and can make some mistakes.
> Well, what happens with the printers, workstations, devices which are
> served by an IP from a reservation if has a lack of DHCP service?
> They lost their IPs and become uninstable or they still working without any
> problems until the service becomes available, or we have a "gap" which
> determines how long they can work without the DHCP service?
>
> Thanks
>

You can check this yourself.

DHCP server has a standard lease duration for each scope.
All DHCP clients try to renew their existing IP lease when it is 50% expired.

If you execute ipconfig /all on a DHCP client with a reserved IP you will
see entries for 'Lease granted' and 'Lease expires'.
If the gap between these is 6 days, observe and check if lease is renewed
every 3 days.

In this case DHCP server can be down for 72 hours before you have a problem.
What happens then I don't know, and don't want to find out the hard way!

So it is better to have DHCP servers, and here reservations are worthwhile.
A DHCP server can assign a reserved IP which is within scope, but outside
its' pool of addresses for distribution'.
So reservations should be identical on both servers, in an address range
which does not overlap the distribution pool of server A or server B.
--
Regards,
Newell White

=?Utf-8?B?TmV3ZWxsIFdoaXRl?= <(E-Mail Removed)>
wrote in news:6D056B23-D262-4859-83B4-(E-Mail Removed):
>
> You can check this yourself.
>
> DHCP server has a standard lease duration for each scope.
> All DHCP clients try to renew their existing IP lease when it is 50%
> expired.
>
> If you execute ipconfig /all on a DHCP client with a reserved IP you
> will see entries for 'Lease granted' and 'Lease expires'.
> If the gap between these is 6 days, observe and check if lease is
> renewed every 3 days.
>
> In this case DHCP server can be down for 72 hours before you have a
> problem. What happens then I don't know, and don't want to find out
> the hard way!
>
> So it is better to have DHCP servers, and here reservations are
> worthwhile. A DHCP server can assign a reserved IP which is within
> scope, but outside its' pool of addresses for distribution'.
> So reservations should be identical on both servers, in an address
> range which does not overlap the distribution pool of server A or
> server B.

Thanks