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Thread: Stop DNS registration on secondary network card of Domain Controll

  1. #1
    Kent Guest

    Stop DNS registration on secondary network card of Domain Controll

    Hi,
    Due to company policy to enable backup via a secondary network card, there
    are 2 NIC on domain controllers. But i need to stop DNS registration on the
    secondary network card, i've tried the solution on
    http://support.microsoft.com/kb/246804 but it's not working.

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\<Interface name>\DisableDynamicUpdate

    Anyone can help?
    TQ

  2. #2
    Paul Bergson [MVP-DS] Guest

    Re: Stop DNS registration on secondary network card of Domain Controll

    This is a bad policy and should be pulled, 1 NIC per dc.

    --
    Paul Bergson
    MVP - Directory Services
    MCTS, MCT, MCSE, MCSA, Security+, BS CSci
    2008, 2003, 2000 (Early Achiever), NT4

    http://www.pbbergs.com

    Please no e-mails, any questions should be posted in the NewsGroup
    This posting is provided "AS IS" with no warranties, and confers no rights.

    "Kent" <Kent@discussions.microsoft.com> wrote in message
    news:BD84F81B-9F3C-41A8-9224-6D1551A91109@microsoft.com...
    > Hi,
    > Due to company policy to enable backup via a secondary network card, there
    > are 2 NIC on domain controllers. But i need to stop DNS registration on
    > the
    > secondary network card, i've tried the solution on
    > http://support.microsoft.com/kb/246804 but it's not working.
    >
    > HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\<Interface
    > name>\DisableDynamicUpdate
    >
    > Anyone can help?
    > TQ




  3. #3
    Meinolf Weber Guest

    Re: Stop DNS registration on secondary network card of Domain Controll

    Hello Kent,

    Do not multihome DC's, this will create more problems then solving some.
    See here if interested why:

    1. Domain Controllers should not be multi-homed
    2. Being a VPN Server and even simply running RRAS makes it multi-homed.
    3. DNS,..even just all by itself, is better on a single homed machine.
    4. Domain Controllers with the PDF Role are automatically Domain Master
    Browser. Master Browsers should not be multi-homed

    272294 - Active Directory Communication Fails on Multihomed Domain Controllers
    http://support.microsoft.com/default...b;en-us;272294

    191611 - Symptoms of Multihomed Browsers
    http://support.microsoft.com/default...b;EN-US;191611

    Phillip Windell
    www.wandtv.com

    The views expressed, are my own and not those of my employer, or Microsoft,
    or anyone else associated with me, including my cats. -----------------------------------------------------


    See also:

    Multihomed DCs, DNS, RRAS servers.
    +++++++++++++++++++++++++++++++++++++++++++++++++++++++
    +++++++++++++++++++++++++++++++++++++++++++++++++++++++
    Below are the manual steps in more detail, which I had outlined in the above
    paragraph:

    Honestly, multi-homed DCs are not recommended because of the associated issues
    that can occur, as you've encountered. We usually recommend purchasing an
    inexpensive Linksys, DLink, etc, Cable/DSL router to perform NAT for you,
    take out the extra NIC off the DC, but still let the DC handle DHCP (and
    not the router).

    Little background on AD and DNS:
    First, just to get this out of the way, if you have your ISP's DNS addresses
    in your IP configuration (DCs and clients), they need to be REMOVED.

    If the ISP's DNS is in there, this will cause additional problems.

    Also, AD registers certain records in DNS in the form of SRV records that
    signify AD's resource and service locations. When there are multiple NICs,
    each NIC registers. IF a client, or another DC queries DNS for this DC, it
    may get the wrong record. One factor controlling this is Round Robin. If
    a DC or client on another subnet that the DC is not configured on queries
    for it, Round Robin will kick in offering one or the other. If the wrong
    one gets offered, it may not have a route to it. On the other hand, Subnetmask
    Priortization will ensure a querying client will get an IP that corresponds
    to the subnet it's on, which will work. To insure everything works, stick
    with one NIC.

    Since this DC is multi-homed, it requires additional configuration to prevent
    the public interface addresses from being registered in DNS. This creates
    a problem for internal clients locating AD to authenticate and find other
    services and resources such as the Global Catalog, file sharing and the SYSVOL
    DFS share and can cause GPO errors with Userenv 1000 events to be logged,
    authenticating to shares and printers, logging on takes forever, among numerous
    other issues.

    But if you like, there are some registry changes to eliminate the registration
    of the external NIC. Here's the whole list of manual steps to follow.

    But believe me, it's much easier to just get a separate NAT device or multihome
    a non-DC then having to alter the DC. - Good luck!

    1. Insure that all the NICS only point to your internal DNS server(s) only
    and none others, such as your ISP's DNS servers' IP addresses.

    2. In Network & Dialup properties, Advanced Menu item, Advanced Settings,
    move the internal NIC (the network that AD is on) to the top of the binding
    order (top of the list).

    3. Disable the ability for the outer NIC to register. The procedure, as
    mentioned, involves identifying the outer NIC's GUID number. This link will
    show you how:
    246804 - How to Enable-Disable Windows 2000 Dynamic DNS Registrations (per
    NIC too):
    http://support.microsoft.com/?id=246804

    4. Disable NetBIOS on the outside NIC. That is performed by choosing to
    disable NetBIOS in IP Properties, Advanced, and you will find that under the
    "WINS" tab. You may want to look at step #3 in the article to show you how
    to disable NetBIOS on the RRAS interfaces if this is a RRAS server.
    296379 - How to Disable NetBIOS on an Incoming Remote Access Interface
    [Registry Entry]:
    http://support.microsoft.com/?id=296379

    Note: A standard Windows service, called the "Browser service", provides
    the list of machines, workgroup and domain names that you see in "My Network
    Places" (or the legacy term "Network Neighborhood"). The Browser service
    relies on the NetBIOS service. One major requirement of NetBIOS service is
    a machine can only have one name to one IP address. It's sort of a fingerprint.
    You can't have two brothers named Darrell. A multihomed machine will cause
    duplicate name errors on itself because Windows sees itself with the same
    name in the Browse List (My Network Places), but with different IPs. You
    can only have one, hence the error generated.

    5. Disable the "File and Print Service" and disable the "MS Client Service"
    on the outer NIC. That is done in NIC properties by unchecking the respective
    service under the general properties page. If you need these services on
    the outside NIC (which is unlikely), which allow other machines to connect
    to your machine for accessing resource on your machine (shared folders, printers,
    etc.), then you will probably need to keep them enabled.

    6. Uncheck "Register this connection" under IP properties, Advanced settings,
    "DNS" tab.

    7. Delete the outer NIC IP address, disable Netlogon registration, and manually
    create the required records

    a. In DNS under the zone name, (your DNS domain name), delete the outer NIC's
    IP references for the "LdapIpAddress". If this is a GC, you will need to
    delete the GC IP record as well (the "GcIpAddress"). To do that, in the DNS
    console, under the zone name, you will see the _msdcs folder. Under that,
    you will see the _gc folder. To the right, you will see the IP address referencing
    the GC address. That is called the GcIpAddress. Delete the IP addresses referencing
    the outer NIC.

    i. To stop these two records from registering that information,
    use the steps provided in the links below:
    Private Network Interfaces on a Domain Controller Are Registered in
    DNShttp://support.microsoft.com/?id=295328

    ii. The one section of the article that disables these records is done with
    this registry entry:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Netlogon\Parameters
    (Create this Multi-String Value under it):
    Registry value: DnsAvoidRegisterRecords
    Data type: REG_MULTI_SZ
    Values: LdapIpAddress
    GcIpAddress

    iii. Here is more information on these and other Netlogon Service records:

    Restrict the DNS SRV resource records updated by the Netlogon service

    [including GC]:

    http://www.microsoft.com/technet/tre...o_rr_in_ad.asp

    b. Then you will need to manually create these two records in DNS with the
    IP addresses that you need for the DC. To create the

    LdapIpAddress, create a new host under the domain, but leave the "hostname"
    field blank, and provide the internal IP of the DC, which results in a
    record that looks like:
    (same as parent) A 192.168.5.200 (192.168.5.200 is used for illustrative
    purposes)

    i. You need to also manually create the GcIpAddress as well, if this is a
    GC. That would be under the _msdcs._gc SRV record under the zone. It is created
    in the same fashion as the LdapIpAddress mentioned above.

    8. In the DNS console, right click the server name, choose properties, then
    under the "Interfaces" tab, force it only to listen to the internal NIC's
    IP address, and not the IP address of the outer NIC.

    9. Since this is also a DNS server, the IPs from all NICs will register,
    even if you tell it not to in the NIC properties. See this to show you how
    to stop that behavior (this procedure is for Windows 2000, but will also
    work for Windows 2003):
    275554 - The Host's A Record Is Registered in DNS After You Choose Not to
    Register the Connection's Address:
    http://support.microsoft.com/?id=275554

    10. If you haven't done so, configure a forwarder. You can use 4.2.2.2 if
    not sure which DNS to forward to until you've got the DNS address of your
    ISP.
    How to set a forwarder? Good question. Depending on your operating
    system,choose one of the following articles:

    300202 - HOW TO: Configure DNS for Internet Access in Windows 2000 http://support.microsoft.com/?id=300202&FR=1

    323380 - HOW TO: Configure DNS for Internet Access in Windows Server 2003
    (How to configure a forwarder):
    http://support.microsoft.com/d/id?=323380

    Active Directory communication fails on multihomed domain controllers http://support.microsoft.com/kb/272294

    <==*** Some additional reading ***==>
    More links to read up and understand what is going on:

    292822 - Name Resolution and Connectivity Issues on Windows 2000 Domain
    Controller with Routing and Remote Access and DNS Insta {DNS and RRAS and
    unwanted IPs registering]:
    http://support.microsoft.com/?id=292822

    Active Directory communication fails on multihomed domain controllers http://support.microsoft.com/kb/272294

    246804 - How to enable or disable DNS updates in Windows 2000 and in Windows
    Server 2003
    http://support.microsoft.com/?id=246804

    295328 - Private Network Interfaces on a Domain Controller Are Registered in
    DNS
    [also shows DnsAvoidRegisterRecords LdapIpAddress to avoid reg sameasparent
    private IP]:
    http://support.microsoft.com/?id=295328

    306602 - How to Optimize the Location of a DC or GC That Resides Outside of
    a Client's
    Site [Includes info LdapIpAddress and GcIpAddress information and the SRV
    mnemonic values]:
    http://support.microsoft.com/?id=306602

    825036 - Best practices for DNS client settings in Windows 2000 Server and
    in Windows Server 2003 (including how-to configure a forwarder): http://support.microsoft.com/default...b;en-us;825036

    291382 - Frequently asked questions about Windows 2000 DNS and Windows
    Server 2003 DNS
    http://support.microsoft.com/?id=291382

    296379 - How to Disable NetBIOS on an Incoming Remote Access Interface
    [Registry Entry]:
    http://support.microsoft.com/?id=296379

    Rid Pool Errors and other mutlhomed DC errors, and how to configure a multihomed
    DC, Ace Fekay, 24 Feb 2006 http://www.ureader.com/message/3244572.aspx

    _________________________ +++++++++++++++++++++++++++++++++++++++++++++++++++++++
    +++++++++++++++++++++++++++++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++++++++++++++++++++++++++++

    --
    Regards,
    Ace


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

    Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT, MVP
    Microsoft MVP - Directory Services
    Microsoft Certified Trainer

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    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


    > Hi,
    > Due to company policy to enable backup via a secondary network card,
    > there
    > are 2 NIC on domain controllers. But i need to stop DNS registration
    > on the
    > secondary network card, i've tried the solution on
    > http://support.microsoft.com/kb/246804 but it's not working.
    > HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\
    > Interfaces\<Interface name>\DisableDynamicUpdate
    >
    > Anyone can help?
    > TQ




  4. #4
    Jorge Silva Guest

    Re: Stop DNS registration on secondary network card of Domain Controll

    Hi

    Go to the properties of the NIC, select TCP/IP, properties, advanced, select
    DNS TAB, make sure that the last 2 options are not selected: "Register this
    Connection's address in DNS" and "Use this connection's DNS suffix in DNS
    registration".

    Then open DNS mmc console, rightclick on the server icon and choose
    properties: make sure that the server is configured to respond only to the
    correct address (Make sure that the option "Respond All Address" is not
    selected).

    --
    I hope that the information above helps you.


    Have a Nice day.

    Jorge Silva
    MCSE, MVP Directory Services


  5. #5
    Hank Arnold (MVP) Guest

    Re: Stop DNS registration on secondary network card of Domain Controll

    Kent wrote:
    > Hi,
    > Due to company policy to enable backup via a secondary network card, there
    > are 2 NIC on domain controllers. But i need to stop DNS registration on the
    > secondary network card, i've tried the solution on
    > http://support.microsoft.com/kb/246804 but it's not working.
    >
    > HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\<Interface name>\DisableDynamicUpdate
    >
    > Anyone can help?
    > TQ


    Disable the 2nd NIC. Keep it as a backup in case the primary one fails....

    --

    Regards,
    Hank Arnold
    Microsoft MVP
    Windows Server - Directory Services

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