AD first or DNS first

Discussion in 'Active Directory' started by WooYing, Mar 2, 2005.

  1. WooYing

    WooYing Guest

    My Question is rather simple. I am planning to upgrade my NT4 Network to AD,
    but I think since AD rely on DNS so much should I upgrade my BDC to Win2K3
    first, but that I mean the OS and DNS, DHCP and WINS. Then afterwards
    upgrade my PDC with AD. What are the pro's and con's. Any input is
    appreciated. TIA
    WooYing, Mar 2, 2005
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  2. WooYing

    Andy L Guest

    Here's what I did:
    Setup temp PC (or new server) as a clean NT4 Server BDC.
    Promote it to PDC.
    Upgrade it to Win2003 (you MUST upgrade the PDC first, not a BDC!!)
    If the upgrade fails, you can simply take your original PDC (which should
    now be a BDC) and promote it back to PDC, easy recovery should anything go
    During upgrade, the AD install wizard will kick in to upgrade your existing
    NT4 domain accounts, etc. to AD. It will also prompt you to install DNS
    which you should do unless you are planning any kind of external DNS
    Configure the DNS as appropriate for your network (like forwarding requests
    to an ISP DNS server) and then have all your clients point to the new DNS
    address for DNS requests.

    If you used a temp PC, then install a permanent server (or upgrade your
    other BDCs and servers) and add the DC and DNS roles to it, transfer the
    roles and take down the temp PC (uninstall the DC and DNS roles). You should
    have 2 permanent DCs for you domain first though. I used a temp PC because I
    have sometimes had issues getting NT4 Server to run properly on some of the
    newer servers (finding the right drivers and stuff).

    This is a quick and dirty path, but there is lots of good docs on the MS web
    site about NT4 upgrades and all the issues you need to consider.
    Andy L, Mar 2, 2005
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  3. WooYing

    ptwilliams Guest

    Yes, if you are using 2003, let the dcpromo wizard do the DNS for you - it
    creates the zones as application partitions and automatically delegates the
    _msdcs sub-domain forest wide among other things.


    Paul Williams
    ptwilliams, Mar 2, 2005
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