Migrating whole domain to another IP scope


We are planning migration process to new network structure (from collapsed-core to building blocks) and every server is going to have new ip address.

I am worrying little bit about moving domain controllers. Easiest way would be probably to make new scope as new site and move one by one over, but we need to do whole project as cut off, so everything should be moved to new IP addressing at once.
We have few hours acceptable downtime, but is there anything special I should know in changing IP addresses on domain controllers?

We have 2 domain controllers in and will be moved to

I'll be thankful for any useful advice.
Tomasz CzyzSystem AdministratorAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
as long as the dns servers are changed to use the new addresses, it should update its own A record

you should update each other's record since it won't know that each other changed
for example, ServerA will show the old IP of ServerB so you need to update ServerB's address in ServerA DNS else it won't know ServerB changed its address.  Same thing the other way with ServerB's DNS record of ServerA.  if you don't update those records, they won't find each other and replication will fail.  

also make sure to update sites and services so that the site has the new subnet
Do you have other domain controllers or just these two?

Make sure DNS is set to listen on all addresses.

Make sure IP configuration gets set correctly.

Make sure all domain members are able to reach the servers to resolve DNS.  (Change IP configuration on machines with static addresses, change DHCP scope options and make sure machines get the new options, make sure any firewalls will allow DNS traffic, etc.)

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