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Network switching with Windows 2003 DHCP

Last Modified: 2012-05-09
I try to switch from network to as follows:
Existing win 2003 server with DHCP server has ip
added secondary ip address to it:
added new dhcp range , configured options, reservations etc.
Changed the max lease time from several days to a few minutes  and waited for the setting to propagate to clients
So far so good.
To switch networks I then disabled the old range and enabled
According to log, all old renewal requests fail (NACK), also after the max lease time. In fact it appears that the clients sooner or later give up. I don't see any leases issued by the new range at all.
After much more thanmax lease time, I disabled the new range and enabled the old range again; almostimmediately clients started to query and successfully obtain old range leases.

Why did the transition fail?
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