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How do I migrate a 2003 Enterprise Server x64 domain to new IP subnet?

Posted on 2008-10-09
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Last Modified: 2013-11-29
I have a Windows 2003 x64 Server domain with static IP addresses on the (16) servers and a DHCP pool for users, 2 SANs, 3 DCs, 4 DNS servers and a handful of (layer 2) switches. I am required to migrate to a new subnet and need to cause as little downtime on the system and as little interruption to users as possible. I understand that The DHCPEXIM tool will not work in WIN2003 and am particularly concerned about migrating my DCs. Any recommendations on how to perform this migration quickly and efficiently would be greatly appreciated. A description of known problems/pitfalls/common mistakes associated with this type of migration would actually get you added to my Christmas list.
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Question by:Landmind
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lnkevin earned 500 total points
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Moving to different subnet within the same domain will not be a big change. All you need is making sure your DNS is update after the migration. As long as the old and new subnet are cross talked, you should not have any issues.

- update the dns servers with new A records for the DC's and DNS servers new ip addresses. if you are using reverse lookup zones, then add the PTR records as well.
- Add new ip addresses in your IP Setting of your server NIC's Properties to be secondary IP
- Migrate DC and Global Catalogs then change DNS server
- In the migration, you change the new IP in your NIC property to be primary and keep the old IP as the secondary. Don't forget to change your GW address.

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