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Changing IP addresses throughout an office

We have an office where we have to change the IP address on every machine to a completely new IP address scheme. The office currently has two Windows 2000 domain controllers running Active Directory, DHCP and DNS on each machine and the IP address on these two machines must change as well. Note that there are other Windows 2000 domain controllers in other offices located in other states who are set up with Active Directory, DHCP and DNS that will stay "AS IS". All of these active directory domain controllers "talk" to each other and the zones on these servers are all active directory integrated.

I am concerned that we don't know all the steps needed to change the IP addresses on the two domain controllers and get everything working correctly in the office, much less getting all the domain controllers in all offices "talking" to each other after the IP address change.

If you can provide us with any information about how to correctly change the IP addresses on these two domain controllers we would very much appreciate the help.

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Here are the general steps:

- Create the new subnets in the Active Directory Sites and Services
- Assign the new subnets to the appropriate Active Directory Site
- Change the IP address of 1 of your domain controllers
- Validate the replication of the domain controller with the others (REPLMON from the Windows 2000 SUpport Tools on the Windows 2000 CD works well)
- Check that the IP helper address on the Routers that you may have includes the new IP address for the DHCP server that you have. Otherwise no one will be able to get new IP addresses.
- Create the new DHCP scopes in the DHCP server with the new information
- If possible check that a workstation can get a new IP address. If would imply that you have networking setup to allow this to happen, e.g you have addition ports at the desks to allow for a dual connection or you have a lab to be able to create the new network/ip environment in.
- Once verified you should be able to reIP the DC/DNS/DHCP systems.
- Reboot the workstations to see that they get the new DHCP information

That should take care of most of it. You will want to look for Reservations or static IP'ed systems like printers and special equipment.

This was first published in May 2004

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