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Thread: Force prefernce in logon server

  1. #1
    NGReader Guest

    Force prefernce in logon server

    I have 3 DCs in this single forest domain all on same network. Is there a
    method to force the preference of logon server?

    Carl




  2. #2
    Ace Fekay [Microsoft Certified Trainer] Guest

    Re: Force prefernce in logon server

    In news:eOcjhyvlJHA.4028@TK2MSFTNGP03.phx.gbl,
    NGReader <carl@anywhere.com>, posted the following:
    > I have 3 DCs in this single forest domain all on same network. Is
    > there a method to force the preference of logon server?
    >
    > Carl


    Hi Carl,

    Yes, it is possible. You would change the weight and/or priority with the
    SRV records. That is done on a DC's netlogon registry, and not in DNS. This
    is because the netlogon service is what registers that data into their
    respective SRV folders.

    When changing them, keep in mind a client will attempt to contact a server
    with the lowest priority first. If there are more than one server with the
    same priority, DNS load balancing is used when selecting the target server.
    If the weights are changed with the same priority, then a server is chosen
    based a percentage by dividing the weigth by the sum of all weights of all
    DCs in an AD Site.

    Let's say you have 3 DCs: DC01, DC02 and DC03. Weights are assigned as
    follows:
    DC01 = 10
    DC02 = 20
    DC03 = 30

    In this example:
    DC01 will be contacted 1 out of every 6 times (10/(30+20+10))
    DC02 will be contacted 2 out of every 6 times (10/30(20/(30+20+10)))
    DC03 will be contacted 3 out of every 6 times (10/20(30/(30+20+10)))

    You can use nslookup to find the SRV weights:
    nslookup
    q=srv
    _ldap._tcp.dc01._msdcs.domain.com

    Make sense? Next week, we'll go over the Wall Street Bailout Fund (TARP) and
    try to figure that one out!

    Anyway, back to the subject. You can read more about it here:
    How DNS Support for Active Directory Works
    http://technet.microsoft.com/en-us/l.../cc759550.aspx

    AD Cookbook by Robie Allen and Laura E. Hunter
    http://books.google.com/books?id=AUx...sult#PPA105,M1

    JSI Tip 4527. How can I manage which Windows 2000 domain controller a client
    contacts? (WIndows 2000 & 2003 are the same):
    http://windowsitpro.com/article/arti...-contacts.html

    I hope that helps.

    --
    Ace

    This posting is provided "AS-IS" with no warranties or guarantees and
    confers no rights.

    Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCT
    Microsoft Certified Trainer
    aceman@mvps.RemoveThisPart.org

    For urgent issues, you may want to contact Microsoft PSS directly. Please
    check http://support.microsoft.com for regional support phone numbers.


  3. #3
    Jorge Silva Guest

    Re: Force prefernce in logon server

    Hi
    Additionally you can isolate the DC and the clients in a given dedicated
    site with the proper subnet assign and apply the
    http://support.microsoft.com/kb/306602.

    --

    I hope that the information above helps you.
    Have a Nice day.

    Jorge Silva
    MCSE, MVP Directory Services

    "Ace Fekay [Microsoft Certified Trainer]" <firstnamelastname@hotmail.com>
    wrote in message news:eDqEoYwlJHA.4760@TK2MSFTNGP04.phx.gbl...
    > In news:eOcjhyvlJHA.4028@TK2MSFTNGP03.phx.gbl,
    > NGReader <carl@anywhere.com>, posted the following:
    >> I have 3 DCs in this single forest domain all on same network. Is
    >> there a method to force the preference of logon server?
    >>
    >> Carl

    >
    > Hi Carl,
    >
    > Yes, it is possible. You would change the weight and/or priority with the
    > SRV records. That is done on a DC's netlogon registry, and not in DNS.
    > This is because the netlogon service is what registers that data into
    > their respective SRV folders.
    >
    > When changing them, keep in mind a client will attempt to contact a server
    > with the lowest priority first. If there are more than one server with the
    > same priority, DNS load balancing is used when selecting the target
    > server. If the weights are changed with the same priority, then a server
    > is chosen based a percentage by dividing the weigth by the sum of all
    > weights of all DCs in an AD Site.
    >
    > Let's say you have 3 DCs: DC01, DC02 and DC03. Weights are assigned as
    > follows:
    > DC01 = 10
    > DC02 = 20
    > DC03 = 30
    >
    > In this example:
    > DC01 will be contacted 1 out of every 6 times (10/(30+20+10))
    > DC02 will be contacted 2 out of every 6 times (10/30(20/(30+20+10)))
    > DC03 will be contacted 3 out of every 6 times (10/20(30/(30+20+10)))
    >
    > You can use nslookup to find the SRV weights:
    > nslookup
    > q=srv
    > _ldap._tcp.dc01._msdcs.domain.com
    >
    > Make sense? Next week, we'll go over the Wall Street Bailout Fund (TARP)
    > and try to figure that one out!
    >
    > Anyway, back to the subject. You can read more about it here:
    > How DNS Support for Active Directory Works
    > http://technet.microsoft.com/en-us/l.../cc759550.aspx
    >
    > AD Cookbook by Robie Allen and Laura E. Hunter
    > http://books.google.com/books?id=AUx...sult#PPA105,M1
    >
    > JSI Tip 4527. How can I manage which Windows 2000 domain controller a
    > client contacts? (WIndows 2000 & 2003 are the same):
    > http://windowsitpro.com/article/arti...-contacts.html
    >
    > I hope that helps.
    >
    > --
    > Ace
    >
    > This posting is provided "AS-IS" with no warranties or guarantees and
    > confers no rights.
    >
    > Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCT
    > Microsoft Certified Trainer
    > aceman@mvps.RemoveThisPart.org
    >
    > For urgent issues, you may want to contact Microsoft PSS directly. Please
    > check http://support.microsoft.com for regional support phone numbers.



  4. #4
    Meinolf Weber [MVP-DS] Guest

    Re: Force prefernce in logon server

    Hello NGReader,

    As said from the others you can configure it:
    http://technet.microsoft.com/en-us/l.../cc787370.aspx

    http://support.microsoft.com/kb/816587

    Best regards

    Meinolf Weber
    Disclaimer: This posting is provided "AS IS" with no warranties, and confers
    no rights.
    ** Please do NOT email, only reply to Newsgroups
    ** HELP us help YOU!!! http://www.blakjak.demon.co.uk/mul_crss.htm



  5. #5
    Jorge de Almeida Pinto [MVP - DS] Guest

    Re: Force prefernce in logon server

    WHY you do want to do that? Explain that first please

    --

    Cheers,
    (HOPEFULLY THIS INFORMATION HELPS YOU!)

    # Jorge de Almeida Pinto # MVP Identity & Access - Directory Services #

    BLOG (WEB-BASED)--> http://blogs.dirteam.com/blogs/jorge/default.aspx
    BLOG (RSS-FEEDS)--> http://blogs.dirteam.com/blogs/jorge/rss.aspx
    ------------------------------------------------------------------------------------------
    * This posting is provided "AS IS" with no warranties and confers no rights!
    * Always test ANY suggestion in a test environment before implementing!
    ------------------------------------------------------------------------------------------
    #################################################
    #################################################
    ------------------------------------------------------------------------------------------

    "NGReader" <carl@anywhere.com> wrote in message
    news:eOcjhyvlJHA.4028@TK2MSFTNGP03.phx.gbl...
    > I have 3 DCs in this single forest domain all on same network. Is there
    > a method to force the preference of logon server?
    >
    > Carl
    >
    >
    >


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