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Win 2008R2 DNS & DHCP

Currently using a Win 2003 SBS server and added a Win 2008 R2 server to the farm using existing server domain. Would like to retire Win 2003 and install DNS & DHCP roles on Win 2008 R2 server.
Would it be best in Win 2003 SBS services to disable DNS server & DHCP server and then install DNS & DHCP roles on Win 2008 R2?
I would like to use the same domain on the Win 2008 R2 server.
Then migrate over users and migrate users, leases, reservations, etc.
Is this the best migration path to take? Would like to make this an uneventful migration.
Microsoft Legacy OSMicrosoft Server OSWindows Server 2008

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8/22/2022 - Mon
Sushil Sonawane

As you mention you want to retire windows 2003 server from your environment so You can disable the dhcp service.

For DNS, It's integrated with your Active directory. Transfer your FSMO role to your new 2008 R2 machine then remove active directory using command dcpromo. After remove your AD your dns server also automatic removed.

To transfer role refer below link :


You can split the scope using excluded IPS in order to have two DHCP servers on the network.  This way you will not run into a situation where you do not have a functional DHCP server.
You would need to authorized the win2k8 DHCP server.
Properties of the DHCP server has a tab dealing with conflict detection.

Often it is suggested to have a 70/30 split.
Static/reserved IPs should be added to both.
Netsh DHCP server can be used to export current settings dealing with reserved IPS and import them into the other.

DNS can be added to the 2008R2 DC at any time.  It's the first thing I would do.  Keep the zones AD integrated.  You can modify the DHCP options so that clients use both (or just the new) for DNS.

With SBS you can't transfer the FSMO roles from it, so you have to disconnect the SBS from the domain/network, then seize the roles on the other DC and perform metadata cleanup for the removed SBS.
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William Peck

I was first planning of disconnecting the SBS from the farm, then do my magic on the 2008R2 server. This will give me a resource for what needs to be transferred.

What is the best method of removing the metadata cleanup for the SBS? I was planning on disabling both DNS server & DHCP server in services. Then leave both DNS & DHCP client running on SBS and add it back to the farm. Is this a good plan?

Thanks for your assistance, you all are very helpful.
Sushil Sonawane

Run the dcpromo command and simply your AD remove from server. If it is not successful then run the metadata cleanup.

To perfrom the metadata clean refer below link:



Then leave both DNS & DHCP client running on SBS and add it back to the farm. Is this a good plan?
Huh?  Add it back to the farm?  I thought you wanted to retire the SBS.

Previously I stated that you can't transfer the FSMO roles (that's always been my understanding), but according to this you can.
You may want to use it as a guide.  Skip steps 6-11 if they don't apply.
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Attn: footech - We still have some legacy software that cannot be moved to 2008R2, this is why I would like to keep it in the farm for now. Otherwise, all other applications will run on the 2008R2. Thanks, I will review the guide.

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