Override DNS Record

Discussion in 'DNS Server' started by Brian, Dec 16, 2009.

  1. Brian

    Brian Guest

    When we have users on our guest wireless, they use our internal DNS, but
    have no other access to our network resources. This leads to a problem when
    they try to access webmail, or FTP since it resolves to our internal
    address, rather than having them use our address over the internet.

    So is there some way we can "override" the DNS addresses for certain hosts?
    Something like assigning a host record through DHCP?

    Brian, Dec 16, 2009
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  2. It's not an "override" rather that you have to make additional records
    internally to make it work. For example, if your internal AD DNS domain name
    is the same as the external name, you have to add a record internally that
    is the same as the external name (such as "webmail") and provide the
    internal IP. If the name is different, then you have to add the external
    name zone on your internal DNS, add the "webmail" A record, and provide the
    internal IP address.

    Read more on it my blog, link below. I hope you find it helpful.

    Split Zone or no Split Zone - Can't Access Internal Website with External


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

    Please reply back to the newsgroup or forum for collaboration benefit among
    responding engineers, and to help others benefit from your resolution.

    Ace Fekay, MCT, MCITP EA, MCTS Windows 2008 & Exchange 2007, MCSE & MCSA
    2003/2000, MCSA Messaging 2003
    Microsoft Certified Trainer

    For urgent issues, please contact Microsoft PSS directly. Please check
    http://support.microsoft.com for regional support phone numbers.
    Ace Fekay [MCT], Dec 16, 2009
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  3. Brian

    Brian Guest

    I'm not sure how applicable this is, but that does describe our problem. I
    have a DNS entry for webmail.domain.com with an IP on our internal network.
    However the guest users need the external IP.

    Brian, Dec 17, 2009
  4. Can't have it both ways. Guest will have to be on a different network with
    a different DNS that resolves as you want it to be,...unless you want to
    statically set the guest DNS and then "un-set" it before they leave. You
    can statically set the DNS and still use DHCP for the rest.

    Phillip Windell

    The views expressed, are my own and not those of my employer, or Microsoft,
    or anyone else associated with me, including my cats.
    Phillip Windell, Dec 17, 2009

  5. Agreed.

    Ace Fekay [MCT], Dec 18, 2009
  6. Brian

    Brian Guest

    Drat. Oh well. I guess I can have DHCP assign them the external DNS. That
    will solve the problem.
    Brian, Dec 18, 2009
  7. Sure, as long as it's a separate DHCP scope for the Guest network. You
    wouldn't want to assign an external DNS for the internal machines, or you
    will have numerous issues with AD.

    Ace Fekay [MCT], Dec 18, 2009
  8. Brian

    Brian Guest

    It is.

    Thanks for the help everybody.
    Brian, Dec 21, 2009
  9. Then you should be fine. Keep in mind, any guests on the Guest network, if
    they happen to be internal users, will not be able to access internal
    resources unless they were to VPN in.

    Ace Fekay [MCT], Dec 21, 2009
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