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Network switching with Windows 2003 DHCP

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Last Modified: 2012-05-09
I try to switch from network 1.1.1.0/24 to 2.2.2.0/24 as follows:
Existing win 2003 server with DHCP server has ip 1.1.1.1
added secondary ip address to it: 2.2.2.1
added new dhcp range 2.2.2.0/24 , 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 1.1.1.0/24 and enabled 2.2.2.0/24
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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