Hi, How many switches do you have that need programming up. Id be tempted to:
Spin up the new DHCP server. Get it authorised on the domain. Export out the DHCP from the old server/ import to the new one. Stop the DHCP services on the Old. Change the helper IP on the switch to the new. That’s way if anything goes wrong, just restart DHCP on the old server and change the helper IP's back again. Gavin Wilby IT Support Engineer -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Michael Leone Sent: 10 March 2015 16:10 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? SMP Partners Limited, SMP Trustees Limited and SMP Fund Services Limited are licensed by the Isle of Man Financial Supervision Commission. SMP Accounting & Tax Limited is a member of the ICAEW Practice Assurance Scheme. SMP Partners Limited registered in the Isle of Man, Company Registration No: 000908V Directors: M.W. Denton, M.J. Derbyshire, P.N. Eckersley, S.E McGowan, O. Peck, J.J. Scott, S.J. Turner SMP Trustees Limited registered in the Isle of Man, Company Registration No: 068396C Directors: A.C. Baggesen, M.W. Denton, O. Peck, J.J. Scott, J. Watterson, J. Cubbon SMP Fund Services Limited registered in the Isle of Man, Company Registration No: 120288C Directors: V. Campbell, M.W. Denton, P.N. Eckersley, D.A. Manser, S.E McGowan, O. Peck, J.J. Scott, R.K. Corkill SMP Accounting & Tax Limited registered in the Isle of Man, Company Registration No: 001316V Directors: I.F. Begley, A.J. Dowling, P. Duchars, P.N. Eckersley, J.J. Scott, S.J. Turner SMP Capital Markets Limited registered in the Isle of Man, Company Registration No: 002438V Directors: M.W. Denton, M.J. Derbyshire, D.F Hudson, S.E McGowan, O. Peck, J.J. Scott. SMP Partners Limited, SMP Trustees Limited, SMP Fund Services Limited, SMP Accounting & Tax Limited and SMP Capital Markets Limited are members of the SMP Partners Group of Companies. This email is confidential and is subject to disclaimers. Details can be found at: http://www.smppartners.com/disclaimer.asp ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com ______________________________________________________________________
