DHCP Lease in Failover Configuration

Glenn Satchell Glenn.Satchell at uniq.com.au
Tue Jul 11 21:23:09 UTC 2006

>Date: Tue, 11 Jul 2006 14:39:16 -0400
>From: "Jiann-Ming Su" <sujiannming at gmail.com>
>To: dhcp-users at isc.org
>Subject: Re: DHCP Lease in Failover Configuration
>Content-Disposition: inline
>On 7/11/06, Glenn Satchell <Glenn.Satchell at uniq.com.au> wrote:
>> With failover the client is initially offered a lease equal to MCLT.
>> This allows that lease to be copied to the failover peer, etc. The next
>> time the client renews it gets the normal (default, or whatever it asked
>> for) lease period.
>Yeah, looks like the default MCLT is 3600.  In my original message, I
>said "one day" but meant "one hour."
>Just so that I'm clear, are you saying that the lease times defaults
>to MCLT when one of the failover peers thinks the other is down?  Or,
>are you saying that even in a healthy failover configuration, the
>default lease time is always MCLT?
>Jiann-Ming Su

The *initial* lease time is always MCLT (1 hour). When the client
renews the lease (about 30 minutes or mclt/2 later) it will get the
full lease time you configured in a healthy system.

If the failover peer is down the client will always get a least time of


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