+ Post New Thread
Page 1 of 2 12 LastLast
Results 1 to 15 of 16
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 ...
  1. #1
    Grommit's Avatar
    Join Date
    Sep 2006
    Location
    Weston-super-Mare
    Posts
    1,335
    Thank Post
    31
    Thanked 54 Times in 31 Posts
    Rep Power
    24

    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 ?

  2. #2
    DMcCoy's Avatar
    Join Date
    Oct 2005
    Location
    Isle of Wight
    Posts
    3,386
    Thank Post
    10
    Thanked 483 Times in 423 Posts
    Rep Power
    110

    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.

  3. #3
    Grommit's Avatar
    Join Date
    Sep 2006
    Location
    Weston-super-Mare
    Posts
    1,335
    Thank Post
    31
    Thanked 54 Times in 31 Posts
    Rep Power
    24

    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 ?

  4. #4
    ajbritton's Avatar
    Join Date
    Jul 2005
    Location
    Wandsworth
    Posts
    1,632
    Thank Post
    23
    Thanked 75 Times in 45 Posts
    Rep Power
    33

    Re: DC Confusion

    Which servers are clients pointing to for DNS?

  5. #5
    Grommit's Avatar
    Join Date
    Sep 2006
    Location
    Weston-super-Mare
    Posts
    1,335
    Thank Post
    31
    Thanked 54 Times in 31 Posts
    Rep Power
    24

    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 ?

  6. #6
    DMcCoy's Avatar
    Join Date
    Oct 2005
    Location
    Isle of Wight
    Posts
    3,386
    Thank Post
    10
    Thanked 483 Times in 423 Posts
    Rep Power
    110

    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.

  7. #7
    Grommit's Avatar
    Join Date
    Sep 2006
    Location
    Weston-super-Mare
    Posts
    1,335
    Thank Post
    31
    Thanked 54 Times in 31 Posts
    Rep Power
    24

    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 ?

  8. #8

    Dos_Box's Avatar
    Join Date
    Jun 2005
    Location
    Preston, Lancashire
    Posts
    9,476
    Thank Post
    525
    Thanked 1,995 Times in 934 Posts
    Blog Entries
    23
    Rep Power
    576

    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.

  9. #9

    GrumbleDook's Avatar
    Join Date
    Jul 2005
    Location
    Gosport, Hampshire
    Posts
    9,881
    Thank Post
    1,316
    Thanked 1,738 Times in 1,087 Posts
    Blog Entries
    19
    Rep Power
    563

    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.

  10. #10
    Grommit's Avatar
    Join Date
    Sep 2006
    Location
    Weston-super-Mare
    Posts
    1,335
    Thank Post
    31
    Thanked 54 Times in 31 Posts
    Rep Power
    24

    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.

  11. #11
    Grommit's Avatar
    Join Date
    Sep 2006
    Location
    Weston-super-Mare
    Posts
    1,335
    Thank Post
    31
    Thanked 54 Times in 31 Posts
    Rep Power
    24

    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 " :-(

  12. #12

    Join Date
    Oct 2006
    Location
    Robert Mays School, Hampshire
    Posts
    100
    Thank Post
    0
    Thanked 0 Times in 0 Posts
    Rep Power
    0

    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?

  13. #13
    Grommit's Avatar
    Join Date
    Sep 2006
    Location
    Weston-super-Mare
    Posts
    1,335
    Thank Post
    31
    Thanked 54 Times in 31 Posts
    Rep Power
    24

    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 ?

  14. #14

    Gatt's Avatar
    Join Date
    Jan 2006
    Posts
    6,541
    Thank Post
    831
    Thanked 610 Times in 413 Posts
    Rep Power
    432

    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

  15. #15
    Jon
    Jon is offline
    Jon's Avatar
    Join Date
    May 2006
    Location
    Norfolk
    Posts
    318
    Thank Post
    28
    Thanked 51 Times in 41 Posts
    Rep Power
    22

    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...

SHARE:
+ Post New Thread
Page 1 of 2 12 LastLast

Similar Threads

  1. Intel CPU confusion
    By contink in forum Hardware
    Replies: 7
    Last Post: 9th November 2007, 10:31 AM
  2. SSL Confusion!
    By mitchell1981 in forum Windows
    Replies: 10
    Last Post: 14th September 2007, 03:17 PM
  3. RIS ACPI confusion
    By netadmin in forum Windows
    Replies: 3
    Last Post: 24th July 2007, 07:52 AM
  4. ISA Confusion
    By Pearno in forum Windows
    Replies: 10
    Last Post: 18th May 2007, 10:34 AM
  5. DHCP confusion
    By Gatt in forum Wireless Networks
    Replies: 5
    Last Post: 31st March 2006, 08:24 AM

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •