If dhcp lease time is short make the lease time longer. That way the Window is lessen of a problem. Op 10 mrt. 2015 17:25 schreef "Gavin Wilby" <[email protected]>:
> 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 > ______________________________________________________________________ >
