howto configure DHCP to reject renewal of lease

Gilbert Coles gilbertx07 at
Thu Oct 12 07:30:54 UTC 2006


What I'm trying to achieve is to configure the ISC dhcpd to give the client 
(when it tries to renew its lease @T/2) a new IP address - to avoid having 
the same IP for a long time.

So, let's say: client1 is given IP1 for 1 day, after 0.5 days client1 will 
ask dhcpd to renew its lease - i want the dhcpd to tell him DHCPNAK - you're 
not allowed to renew your lease. This would force client1 to send a 
DHCPDISCOVER message again and ask for a new IP

Is this functionality available in v3.0.4 of the ISC dhcpd?


>From: "David W. Hankins" <David_Hankins at>
>Reply-To: dhcp-users at
>To: dhcp-users at
>Subject: Re: howto configure DHCP to reject renewal of lease
>Date: Wed, 11 Oct 2006 09:36:07 -0700
>On Wed, Oct 11, 2006 at 04:12:05PM +0200, Gilbert XXXX wrote:
> > is it possible to configure ISC DHCP v3.0.4 to stop renewing leases when 
> > client attempts to renew its lease?
>You've asked a question without any context for what you're trying
>to acheive.
>If you want the server to randomly move clients around every time
>they renew, ISC DHCP doesn't have facilities to do that.
>ISC Training!  October 16-20, 2006, in the San Francisco Bay Area,
>covering topics from DNS to DDNS & DHCP.  Email training at
>David W. Hankins	"If you don't do it right the first time,
>Software Engineer		you'll just have to do it again."
>Internet Systems Consortium, Inc.	-- Jack T. Hankins

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