Just setup the new one and remove the old one.
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Question
Can you force clients to use particular DHCP server?
I have two DHCP servers and plan on getting rid of one (too old hardware), however we have a considerable number of users on the old box. How can I force users to use one box?
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Answers
Right. The problem is that when you shut down the first DHCP server a bunch of users are still going to keep their old IPs until it's time to look for a new lease. At that time they'll find the new DHCP server, but in the meantime you run the risk of duplicate IPs being used all over the place.
If you have the room on the subnet, you can set up the scope on the new DHCP server to be a completely separate range from the first one, shut down the first one, turn on the new one, wait a week or so to make sure everyone is on the new one (depending on your lease times), and then increase your scope range to include the range from the original DHCP server.
It's kind of a pain the butt way of going about it but you could ween the users off by checking on it periodically & narrowing the scope more & more until they're all on the other DHCP server.
how many users are you dealing with? if there are that many you may want to just come in on the weekend, pull the old DHCP offline, & remotely reboot all the PCs using a bat script. the command would look as such for each user's PC name.
shutdown -m \\computername -r -f -t 5
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by: wfcraven12Posted on 2007-09-21 at 07:25:44ID: 19935851
In theory, you should be able to just take down the old server & the next time the user goes to get an IP address, it'll pick up from the other DHCP server. This is under the assumption that this is all under the same domain though. but like i said. that's just in theory.