[TriLUG] Windows DHCP to ISC DHCP migration

[Shawn Hood]

Large pool and a number of reservations.

On 10/24/07, Chris Bullock <cgbullock at yahoo.com> wrote:
>
> Are you using reservations or just have a big pool?  I would shorten the
> lease to say an hour.  The protocol will try to renew in 30 minutes.  So
> after all devices get the 60 minute lease, I would stop the windows dhcp
> service and then start dhcpd.
> --- Shawn Hood <shawnlhood at gmail.com> wrote:
>
> > Folks,
> >
> > Situation:
> >
> > 1) Want to move DHCP services for a pretty sizable userbase to a linux
> > dhcp
> > implementation
> > 2) Cannot have everyone shut off their computers or release/renew their
> > lease
> > 3) Limited IP space within subnet, so the DHCP servers must serve from
> > the
> > same address pool
> >
> > Possible solutions:
> >
> > 1) Import leases from Windows, which I don't think is possible
> >
> > 2) In #trilug there was some mention of doing a failover setup, but the
> > servers must be able to communicate.  The leases aren't replicated by
> > the
> > secondary server listening to dhcp broadcasts and taking notes in
> > preparation for failover.  There is no way, to my knowledge, that
> > failover
> > can be configured in such a manner between windows dhcp and dhcpd.
> >
> > 3) Shorten the lease time to a very small number, wait for all
> > workstations
> > to cycle.  Shut off the Windows DHCP and startup Linux.
> >
> >
> > It seems as if 3 is the best option.  Your input?
> >
> > Shawn
> > --
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>
>
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-- 
Shawn Hood
(910) 670-1819 Mobile