Changing parent/child domain.

I am preparing to change my two site network which is currently set up as a parent and child domain to one domain (the parent). Currently the DCs are set up as Domain1.local and Domain2.Domain1.local. The parent domain is running Server 2008 R2 and the child domain is running Server 2003. I only have 25 users on the child domain and had thought about just setting up the new Server 2008 R2 server and recreating the users as opposed to collapsing the child on the older server. I was hoping to install the new server at the remote location and bring the users over one at a time as to avoid downtime. I have staged the new server at the parent site and am creating the new remote users. The scope at the main domain is 192.168.1.X and 192.168.5.x at the remote location. Do I need to create a new scope at the remote location to add this new server? Am I approaching this project correctly? Advice anyone? Thank you.
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So if I understand you correctly, you have two sites with 2 domains.  You want to stay with 2 sites and end up with one domain?  If this is the case I would

Bring up the new DC at the remote site
Create a new site in AD and add the DC to that site
Update your subnets etc in AD Sites and services
Set your replication schedules
Test functionality.

When you are ready, create your users in your main domain and assign permissions as needed.
Use a tool like ForensIT (The free version works just fine) to migrate your workstations and user profiles over.
Restore all your needed files to new DC
Once this is complete remove your 2003 domain.

Question .. are you running Exchange?
dsimpson2Author Commented:
Thanks for the quick reply Stu29. No exchange in the mix. I quess my biggest problem is the routers that connect the sites are set with the default gateways. Can I use the same scope (5.X) as long as I don't envoke DHCP? Or do I need to bring my firewall guy in to set up a totally different subnet? (6.X)
Personally, to be clean, I would bring up your new DC on its own subnet.  Make sure that routing between your main domain, child domain and new DC is working correctly for your migration.

Using a new subnet helps when configuring your AD site also to help minimize WAN traffic..
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dsimpson2Author Commented:
Thanks again! One last question...when I use ForensIT to migrate accounts will they still be available on the original domain?
ForensIT will migrate the computer accounts over for you to the new Domain (creating accounts for you), and then link existing user profiles on the workstations to the new accounts you create in the New Domain.

You computers will now be members of the Main Domain and not the child Domain (workstation accounts in the Child Domain will be disabled.  Your User accounts in the Child Domain will be unaffected.  So you could use the user accounts, but not the workstations without moving them back over.

Make sense?

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dsimpson2Author Commented:
Thanks for the speedy replies.
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