Domain Server changes DDNS address (Windows Server 2008)

Discussion in 'Windows Networking' started by keenan.pat, Oct 10, 2008.

  1. keenan.pat

    keenan.pat Guest


    I have a Windows Server 2008 server that is part of an Active
    Directory domain, it has one NIC and that NIC has 5 IP address
    associated with it, each of them on the same subnet. I have a number
    of servers that are configured this way, but this it the first 2008
    machine (the rest are 2003). On the Windows Server 2003 servers the
    hostname and DDNS names always mapped to the main, first IP, I
    specified in the NIC's TCP/IP properties. However, on my 2008 machine
    it seems to be mapping to a random IP.

    What would be causing this behavior and how can I get DDNS to map to a
    specif IP that is configured on that machine?

    keenan.pat, Oct 10, 2008
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  2. keenan.pat

    keenan.pat Guest

    I just did an nslookup on my hostname it returned all 7 of the IPs
    that are associated with my server. This has never happened before on
    any of my systems, why would it now?

    keenan.pat, Oct 10, 2008
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  3. Hello ,

    What's the reason for this configuration?
    Meinolf Weber, Oct 10, 2008
  4. keenan.pat

    keenan.pat Guest

    This server host multiple websites that all have different IPs
    keenan.pat, Oct 10, 2008
  5. keenan.pat

    beoweolf Guest

    I would add that excluding the target IP addresses from DDHCP assignment
    might be a good idea. Also look into reservations, see if that is possible
    when serveral IP addresses are mapped to a single NIC. After thought: What
    is the brand of the NIC? Is it intelligent?
    beoweolf, Oct 13, 2008
  6. keenan.pat

    keenan.pat Guest

    After thought: Whatis the brand of the NIC? Is it intelligent?

    This is a Intel Pro/1000 MT NIC used on a VMware ESX virtual machine
    (The NIC is dedicated to my VM).

    I should have probably included some more information regarding my
    environment. All my IPs are static addresses and there are two DNS
    systems on my network - a Unix DNS system which is used for static DNS
    entries which all my IPs have entries in and a DDNS system that is
    handed by our Active Directory system (every machine in our active
    director has at least one entry there).

    Having an multiple host (a) records in DDNS for the one hostname is
    not so much a problem as it is an annoyance since I still have that
    static dns entries I can use. However, I have some services (such as
    RDP) that I only have accessible from one of the IPs (the first IPs I
    installed on the machine) which is not mapped to any of the website
    IPs and I use to just access those services using the hostname, not
    the FQDN.

    So basically my only question is, why would this have just started to
    happen now when I have had many systems set up this way in the past
    and there has only been one DDNS record for them.
    keenan.pat, Oct 13, 2008
  7. keenan.pat

    keenan.pat Guest

    Like I said before there are two DNS systems in our environment. The
    one that is part of Active Directory is a dynamic DNS setup for all
    domain computers. I am not sure why it was set up like this, i am not
    a domain admin. However, we have an extremely large environment and
    that may have had something do with it.
    So, what you are saying is that the behavior i am experiencing is the
    correct behavior, but something in Windows Server 2003 (what all my
    other systems are) caused it to act different and only record one IP
    in our AD's DNS? If that is the case, I can accept that.
    keenan.pat, Oct 13, 2008
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