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Windows Thread, DC Confusion in Technical; Hi Bit confused here.. I have 1 Domain with 3 DC's.. two in the Curricilum Area and One in the ...
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    Grommit's Avatar
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    DC Confusion

    Hi

    Bit confused here..

    I have 1 Domain with 3 DC's.. two in the Curricilum Area and One in the Admin area..

    I took the primary DC with the FMSO roles on down to do some work and the users could not log on (said domain unavailable)

    I thought the reason of having additional DC's was so if one failed the others would authenticate and the users could get to their files on the file server...

    Why did this not work ?

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    Re: DC Confusion

    Do the other DCs also provide DNS/DHCP to the clients? You need to make sure your clients have a secondary DNS server set to another DC if you want it to work.

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    Re: DC Confusion

    Quote Originally Posted by DMcCoy
    Do the other DCs also provide DNS/DHCP to the clients? You need to make sure your clients have a secondary DNS server set to another DC if you want it to work.
    They all have DNS, AD, Print and File... but only the Main DC has DHCP services installed

    How do i set all the clients to point to the secondary DNS server.. in the Primary DC's DHCP settings ?

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    Re: DC Confusion

    Which servers are clients pointing to for DNS?

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    Re: DC Confusion

    To the the 2 Main DC's 192.168.1.1 and 192.168.1.4

    My DC's are

    192.168.1.1 FMSO Roles.. AD, File, Print, DNS, DHCP
    192.168.1.4 AD, File, DNS
    192.168.1.12 AD, File, DNS

    How do i set the workstations to have a secondary DNS server ?

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    Re: DC Confusion

    You can add the second dns server to the dhcp settings, the clients will need to obtain an ip still if they are dhcp, I have a 50/50 spit dhcp, each taking a different range. Its a pain adding the exclusions, but if you already have lots the settings can be exported.

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    Re: DC Confusion

    are you saying that if I add the secondary DNS server to the workstations the wokstations will be able to log on on even tho the primary DC is down ?

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    Re: DC Confusion

    Yes. That is the point of having more than one DNS server in an AD enviroment. Each server is redundent from the other and simply share vital information (DNS mapping, AD info etc) to enable each other to stay up to date sould one suddenly go down.

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    Re: DC Confusion

    Another reason why DCs should just be that ... DCs ... so that if they one goes down you don't lose other services like printing, file serving, application serving, websites, proxies, etc ...

    But in schools the lack of funds often mean that the beefy server you bought has to do so many things.

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    Re: DC Confusion

    Quote Originally Posted by GrumbleDook
    Another reason why DCs should just be that ... DCs ... so that if they one goes down you don't lose other services like printing, file serving, application serving, websites, proxies, etc ...

    But in schools the lack of funds often mean that the beefy server you bought has to do so many things.
    I agree GD... we have a Proliant Beast that was bought to do everything.

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    Re: DC Confusion

    Quote Originally Posted by Dos_Box
    Yes. That is the point of having more than one DNS server in an AD enviroment. Each server is redundent from the other and simply share vital information (DNS mapping, AD info etc) to enable each other to stay up to date sould one suddenly go down.
    Just looked at the DHCP settings and the primary DNS server and secondary DNS servers are listed

    So what could the other reason that users cannot logon when the Primary DC is down ? and the sceondary and 3rd DC's are up..

    Says Domain unavailable " :-(

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    Re: DC Confusion

    Question...

    even though you have set the DNS addresses correctly, if the PDC is down, where are your clients getting IP Addresses from?

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    Re: DC Confusion

    Quote Originally Posted by Stese
    Question...

    even though you have set the DNS addresses correctly, if the PDC is down, where are your clients getting IP Addresses from?
    Wouldn't they already have an ip from the Primary DC DHCP lease ?

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    Re: DC Confusion

    Yep for as long as that lease is active if a client's lease expires whilst the PDC is down then it will need a new DHCP address and will fail returning in an APIPA (169.254.0.1 - 169.154.255.254) and will not let anyone onto the domain.

    Hope you ghave long DHCP leases and refreshed them all before the PDC was taken down

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    Jon
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    Re: DC Confusion

    In an Active Directory domain all domain controllers are equal...However some are more equal than others.

    The first DC in a domain will take on the roll of Global Catalog server. If you don't have a global Catalog server available you cannot log on...

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