Migrate Two Split-Scope Windows Server 2003 DHCP to a Windows Server 2012 R2 R2 DHCP Cluster

CSR14
CSR14 used Ask the Experts™
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Hi Guys,

I was wondering what is the safest option to migrate a 2003 split-scope dhcp setup to 2012 r2? We absolutely need to keep the leases and reservations and the 40+ scopes. I looked around the web and most people migrate dhcps using powershell so i installed the package.

Regards

Jeff
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http://blogs.technet.com/b/canitpro/archive/2013/04/29/step-by-step-migration-of-dhcp-from-windows-server-2003-to-windows-server-2012.aspx

Powershell isn't required on the 2003 server, netsh is a DOS command.

Is  it a 80/20 split? Use the method described above to migrate the DHCP with 80% of the leases. The 20% should be empty and you can ignore them. Or if its just a few, do them manually.

If not, export the 2nd DHCP the same way. Edit the text file and remove the scope create information, just leave the leases/reservation.

Import the file to your Server 2012 as described.

Author

Commented:
I exported both dhcps but the resulting files are unreadable. I can't really edit them.
You're right, I confused it with the dump parameter. This one generates a readable text file but its not dumping leases, just reservations.

netsh dhcp server \\dhcpserver dump > allscopes.txt
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PowerShell on 2012 has  Export-DhcpServer and Import-DhcpServer cmdlets but I've never tried them.

I also doubt it can remotely export the data from a Windows 2003 DHCP but you could give it a try. It will generate an editable XML file.
As a last try use this vbs to export your leases to a text file

http://blogs.technet.com/b/teamdhcp/archive/2006/09/19/dhcp-reservation-tool.aspx

Then convert the leases to XML and try to import them via Import-DhcpServer.

Author

Commented:
In fact, what i was hoping for was a straightforward procedure. I know it can easily be done from 2008 to 2012 but information is lacking for 2003. Any thoughts or field experience would be appreciated.

Jeff

Author

Commented:
Would it be easier if i migrate my two 2003 dhcps to two 2008 r2 test servers and then to the 2012 r2 servers which is a way more documented?

Author

Commented:
I guess the easiest solution here would be to decomission one of the servers and modify the other one to accomodate the entire scopes and then export everything to a 2012 r2 server. This scenario seems more documented so thanks for the cues.
The main problem seems to be getting the leases from the 2003 database to the new server.

This article describes the (imho complicated)  usage of the Windows Server Migration Tools to migrate to 2008 R2 (as an intermediate step)

http://social.technet.microsoft.com/wiki/contents/articles/7411.step-by-step-migration-dhcp-from-windows-server-2003-to-windows-server-2008-r2-with-windows-server-migration-tools.aspx

Never tried that, netsh dchp server export and netsh dhcp server import were always good enough. It is not clear if Windows Server Migration Tools are capabable to grab the leases

Author

Commented:
Here are ma thoughts:

Our DHCP split-scope setup is 50/50.
What if i set lease expiration very low on DHCP #2 (to be retired)
Configure scopes to include  the whole bunch of addresses on DHCP #1
Configure scopes to exclude the whole bunch of addresses on DHCP #2 (this should tell clients that their ip leased is expired and to request new ips which should be provided by DHCP #1)
Configure ip conflict detection on DHCP #1 just in case.
When every lease is transfered to DHCP #1, decomission DHCP #2
Export DHCP #1 config to DHCP 2012 #1
Configure load balance options to DHCP 2012 #2.

How does that sound?

Jeff

Author

Commented:
Another idea just popped in my head. We will be moving a split scope to a cluster of two servers. What if i import DHCP#1 to new dhcp#1 and DHCP#2 to new DHCP #2 and then configure load balancing? Will the scopes sync if i specify the same options on both sides beforehand?

Author

Commented:
Final update:

Here is how i'm going to do it.

Export both 2003 DHCP servers
Import the configs on my new 2012 r2 servers

At this point i'll follow this document but the final import will be done on DHCP 2012 #1:
http://didyourestart.blogspot.ca/2013/02/dhcp-migrate-from-split-scope-to.html

Thanks!

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