Re: DHCP Migration Question
What systems point to the IP from a DHCP server?
If it’s DNS ok, but for DHCP it should be only the IP Helper Addresses on your network components.
Still if a client got a lease, he will try to renew it half way. If the DHCP server is unavailable he will continue retrying (every time half way) until it’s current least until it’s expires.
So fo example: Lease time = 8 days: renewing: 4 days, 2 days, 1 day etc. There might be some civets depending on the client and the lease time. But you get the idea.
However, for DNS, that might be a pain in the but to reconfigure you’re servers, however you might set a secondary address on the new server for the time being until you reset all the other servers to the new DNS server. Or you might be able to script it using PowerShell, WMI or whatever you can use :)
Again, read the RFC for DHCP for a in depth knowledge about DHCP:
Also you didn’t respond to my question, how many reservations. I really don’t care about the current leases, but about the reservations.