[TriLUG] Windows DHCP to ISC DHCP migration

[Chris Bullock]

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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