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Recently configured the IP address of the server 192.168.0.2, then I went ahead and configured its role as a domain controller (This process also configured the DNS). Now I would like to reconfigure the IP as 192.168.1.2

Will this mess domain controller configuration and also the users created on the network (stored on the AD db)? or will this wreak the DNS in anyway?

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    Your domain controller will continue to work, but will the clients still be able to find it? Is it also your DHCP server? Will it now be on a different subnet from the client PCs? (This might be OK, if your router has a properly configued DHCP proxy feature.) Lots to think about.
    – Skyhawk
    Aug 12, 2010 at 4:18
  • Not yet using it as a DHCP server, currently I have just 2 clients on the network so I can manually configure them.
    – Reuben
    Aug 12, 2010 at 4:23
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    You may regret that IP range choice later. 192.168.1.0 is so commonly used in home routers. If you implement a remote access VPN, it could cause a lot of issues.
    – Jason Berg
    Aug 12, 2010 at 4:29
  • what kind of issues?
    – Reuben
    Aug 12, 2010 at 4:31
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    Let's say that your VPN user's home wireless router has an IP address of 192.168.1.1 and his PC is 192.168.1.2. He connects to your VPN, and... well, at best, he won't be able to authenticate against your DC; at worst, you'll have an inadvertent denial of service attack stemming from the IP address conflict.
    – Skyhawk
    Aug 12, 2010 at 4:42

2 Answers 2

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Microsoft has a procedure posted here:

http://technet.microsoft.com/en-us/library/cc794931%28WS.10%29.aspx

Down in the section titled, "To change the static IP address of a domain controller"

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  • what about the dns servers? as it currently shows 127.0.0.1 and I had put in 192.168.0.1 to point it to my router. Will I have to change it back to 192.168.1.1 or can it just be left there just like that?
    – Reuben
    Aug 12, 2010 at 4:26
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    You can have multiple DNS servers in your list. Localhost is needed for local DNS resolution, and another for failback resolution in case the local DNS server is not functioning. Change the other address to the new router address.
    – sysadmin1138 ♦
    Aug 12, 2010 at 4:50
  • how can I input more that 2 dns addresses?
    – Reuben
    Aug 12, 2010 at 14:53
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    @Reuben On the TCPIPv4 setup screen, where you set the IP address, the bottom half of that screen is the Advanced button. Click it. On the Advanced TCP/IP Settings screen there is a DNS tab. You can add more than two DNS servers there.
    – sysadmin1138 ♦
    Aug 12, 2010 at 15:38
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    Never said this before but this is an amazing place to learn on the go!
    – Reuben
    Aug 12, 2010 at 21:15
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I'm pretty sure you'll be okay if you change the IP address. It's the hostname that can sometimes get you into trouble-- however, if it's the primary DNS server for your network client machines, you will at least have to configure your clients with the new DNS server address. Hopefully you either use DHCP which will distribute this change for you (once you modify the DNS setting in your DHCP config and maybe reboot the clients), or you don't have a lot of clients to manually configure.

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