Upgrading/migrating from 32bit 2003 server DC controler to 64bit 3008 r2 Server. DC controler

Make sure your 2008r2 server is fully updated.  Give it a static IP
Add it to the domain
On the nic of the 2008r2 server add the ip of the 2003 domain controller to the DNS entry of the 2008r2 server.
Now follow the below steps to add an additional domain controller
ref link:
https://technet.microsoft.com/en-us/library/cc733027(v=ws.10).aspx

Once the 2008r2 domain controller is up and running open a command line and run
repadmin /replsummary          Verify that you have 0 fails between your domain controllers

Once verified that you have no fails use the ip of the 2008r2  in the primary DNS entry on the same 2008r2 domain controller and the secondary DNS will be the ip of the 2003 domain controller.

Transfer the roles:
On the 2008r2 domain controller open up powershell, right-click and RUN AS ADMINISTRATOR, run the commands
1.  Import-module ActiveDirectory  
2. Move-ADDirectoryServerOperationMasterRole -Identity “Target_DC_Name” –OperationMasterRole 0,1,2,3,4
#Target_DC_Name will be the hostname of your 2008r2 server
To verify role placement open up a command prompt and run  netdom query fsmo      this command will output where your roles are
#you can run this command inside powershell

Are you planning to upgrade the 2003 domain controller to 2008r2 as well?  It would be in your best interest to have 2 domain controllers running in tandem.

We only have one DC  and once the 2008 is completed the old DC is going to be destroyed.  it is a Pentium 3 system very unstable.

The reason why i posted here is because  the New DC  has to have the same name and the same IP address as the old one.  Because in our production environment  we have systems  that have the shares with this server name and the IP address statically setup in the machines.  we have over 40 workstations and 20 production machines  and printers with multiple shares.

if we change the name of the server then we will have  many problems on our Production floor.

So somehow i have to keep the new Server with the same name and the same IP address.  If that is possible.

It would be better to fix your network and stop hard coding machine names - use scripts and group policies that allow you to update the share/server names. You can also start implementing DFS so that the shares are based on the domain name and not dependent upon the server name.

Lee,  i completely agree with you.  But unfortunately i am just the soldier  and i follow the commands that come from Corporate office.  i am in USA  and corporate is in France,  i dont even think anyone from there has seen the system we have here and how its all setup.  So unfortunately i cant do VM.

in the future  we will have a cluster and will have 2 DC's  one will be this current server that i am upgrading  and the second one will be a VM machine.  unfortunately at this time.  i cant do a VM

If you are hosting fileshares on the 2003 DC as well this read will help you along getting your files over with permissioning and so forth.

https://sysbadmin.wordpress.com/2012/09/09/how-to-migrate-your-2003-file-server-to-2008-r2/