On Tue, Mar 10, 2015 at 12:54 PM, Miller Bonnie L. <[email protected]> wrote: > Only issue I've ever had with moving over the IP from the old to new DHCP > server is that sometimes you have to reauthorize the new one. Just make sure > all of your DNS (and WINS if in use) records update correctly at each step in > the IP changes before you move to the next. > > Only other catch on the import/export is if you've added any custom options > you can get some weird/unknown errors when you try to import. You have to > create those options again on the new server prior to import, then it will go > through. For example, we have a few custom options added for phones.
That last is good to know. We, too, have custom options for phones ... Thanks! > -Bonnie > > -----Original Message----- > From: [email protected] [mailto:[email protected]] > On Behalf Of Michael Leone > Sent: Tuesday, March 10, 2015 9:10 AM > To: [email protected] > Subject: [NTSysADM] Advice: migrating DHCP from Win 2008R2 DC to Win2012 > non-DC, then decommision Win2008R2 > > So we've been having massive DHCP problems, the service just becomes > unresponsive until we reboot the server. So the boss has decided to migrate > the DHCP to a new Win2012 R2 VM. And he wants to do it today ... > > So here's what I have: all Win2008 R2 DC (forest and domain at Win2008 > R2 levels) - 7 DCs in total, 3 here at headquarters, 4 out at other sites. > > We want to migrate DHCP from #2 DC here at HQ. This DC does DNS and DHCP (no > FSMO roles). We want to migrate DHCP to the new Win2012 R2 member server. > Then we want to decommission the DC entirely, and re-use it's IP address > (because all our switches use that IP as DHCP helper addresses). > > Now, we have "Migrate DHCP Server to Windows Server 2012 R2" doc, and it > seems relatively straightforward. Export using the migration tools, import > using the migration tools. > > Here is my concern - because I need to keep the same IP address, I need to > decommission the existing DC, so I can re-use it's IP. Where in this process > do I do this? > > Do I: change the IP on the DC *first*; migrate to new Win2012 R2; change it's > IP to match the old IP of #2; decommission the old DC entirely and shut it > down? > > I realize that change the IP on the existing DC means that DHCP will break > (in the sense that the switches won't be able to do DHCP helping). But I just > think that this is easier and safer. > > Thoughts? > >
