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Windows Server 2008 R2 Thread, _msdcs Delegated Zone in Technical; Hi All I'm getting ready to demote the final DC that was here when I started which I've been putting ...
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    Exclamation _msdcs Delegated Zone

    Hi All

    I'm getting ready to demote the final DC that was here when I started which I've been putting off for quite a while now.

    Checking everything and getting ready to do it, I've spotted the delegated _msdcs under the domain.local DNS zone however in the delegation it only has this original DC listed.

    Couple of questions which I can't seem to find a straight answer too:

    1. Is it normal for it just to list a Single DC?
    2. Do I need to add my other 2 DC's to the delegation before demoting?
    3. Do I need to do anything else to look after this delegated zone?


    Any advice much appreciated.

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    Assuming you have no DNS errors in eventvwr then I usually leave it alone.

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    Cache (27th May 2014)

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    jinnantonnixx's Avatar
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    You should be OK just letting DNS sort itself out.

    I've seen pickles where we have strange routing over multiple sites. Have you got a single site (under AD sites and services)?

    It's been a while since I got deep into DNS, but I think it works like this:

    Client pings each of the DCs it finds in _msdcs/dc/_tcp
    If it gets a reply it will look up in (by IP) under AD's sites and services and find the site of DC, and hence the site it belongs to
    It will then bind to that DC (under _sites/<sitename>/_tcp) and this will be its domain controller for that session.
    Last edited by jinnantonnixx; 27th May 2014 at 12:33 PM.

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    Cache (27th May 2014)

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    I haven't done the demotion yet, I'm just busy checking things ready to demote it tomorrow. Just trying to avoid any potential problems that may crop up.

    We are a single site AD all sat under the Default-First-Site.

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