I try to switch from network 126.96.36.199/24 to 188.8.131.52/24 as follows:
Existing win 2003 server with DHCP server has ip 184.108.40.206
added secondary ip address to it: 220.127.116.11
added new dhcp range 18.104.22.168/24 , 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 22.214.171.124/24 and enabled 126.96.36.199/24
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?