DHCP force renew

Randall C Grimshaw rgrimsha at syr.edu
Tue Aug 14 13:37:47 UTC 2012

there is a legacy of some windows clients not appreciating a lease under 10 minutes.... I would greatly appreciate a list of OS that your 60 second lease has worked with - I would love to reduce that setting on our system. Thank you. Thank you.

Randall Grimshaw rgrimsha at syr.edu
From: dhcp-users-bounces+rgrimsha=syr.edu at lists.isc.org [dhcp-users-bounces+rgrimsha=syr.edu at lists.isc.org] on behalf of Chuck Anderson [cra at WPI.EDU]
Sent: Tuesday, August 14, 2012 9:09 AM
To: dhcp-users at lists.isc.org
Subject: Re: DHCP force renew

On Tue, Aug 14, 2012 at 10:49:12AM +0100, Simon Hobson wrote:
> Vijayakumar T. T. wrote:
> >We have a specific project requirement in which the client system
> >needs to register the credentials on a portal. Registration
> >purpose, the client will get a quarantined IP (Restricted IP) from
> >DHCP server to access the portal. Once user register the
> >credentials, the client should get an IP from a different pool,
> >which will have complete access to network.
> >
> >Is there any mechanism by which I can ask a client system to renew
> >the DHCP setting ...
> There isn't any way to force (from the server) the client to renew.
> I believe the 'standard' way to deal with it is to set a short
> maximum lease time on the quarantine pool so that the client will
> naturally renew in a short space of time. If you combine this with
> setting suitable expectations from the user - eg make it well known
> that policy is that access will be granted within 5 minutes, not
> instantly - then this should work.

We set a 60 second lease on our portal subnet.  That way clients
usually renew within 30 seconds.
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