Failover concept clarification

pat patkumar82 at
Thu Jun 18 05:45:15 UTC 2009

Hi david,

I didn't understand, how STOS is calculated ? is it from time stamp ?? mclt
we can make out from the active server configuration for can you explain me
bit detailed.


On Wed, Jun 17, 2009 at 10:48 PM, David W. Hankins <dhankins at> wrote:

>  On Wed, Jun 17, 2009 at 04:15:04PM +0530, pat wrote:
> >   I was performing a failover test in lab with loadbalance split 128, as
> one
> > of the test case i made one of the partner/ peer state down and started
> to
> > acquire lease using the tool, i found after leasing out half of the pool
> an
> > error message thrown as peer hold all free leases, but when i went
> through
> > the dhcpd manual it says when the partner is down the active one will
> hold
> > all the lease in the pool and will not loadbalance.
> The Start Time of Service upon entering the partner-down state is used
> as a reference for the last time the partner server was potentially
> capable of transmitting a reply to any DHCP client.
> So as a safety catch to eliminate potential duplicate allocations, the
> server will not allocate a lease its peer may have until STOS+MCLT
> expires.
> --
> 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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> dhcp-users at
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