Best Practice to keep Public & Private IP Address

Discussion in 'Windows Server' started by insidematrix, Jun 7, 2006.

  1. insidematrix

    insidematrix Guest


    What are the best practices to configure Public & Private IP Address on the
    same network card with different gateways and dns addresses or if we put two
    network cards, what would be the best way for the public and private IP to
    co-exist without any problem.
    I had problem sometime back when I had two network cards with differnt IPs
    (one public and one private). the public ip was hosting a website and the
    private ip was for local LAN. sometimes i couldn't access internet but when i
    used to disable the private ip network card, everything used to work well,
    the same happened vice versa.
    another problem was that the event log showed that there is a duplicate name
    on the network.
    Thanks in advance.
    Best Regards,
    Inside matrix.
    insidematrix, Jun 7, 2006
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  2. If you have a single LAN attached to the Internet you could try not to set
    the default gateway in the internal NIC's TCP/IP configuration, so to use
    only the public NIC's gateway.
    It's quite strange, try to read this KB article: Anyway you probably don't need
    to register the public connection's IP in DNS so you could disable it in the
    DNS tab in TCP/IP advanced properties of your public network interface.
    Remember that if this multihomed machine is a Domain Controller you have to
    make additional configurations to have it work correctly. Internet is full of
    articles related to this topic (multihomed domain controller), see also:

    Hope it helps.


    Carlo Cacciafesta, Jun 7, 2006
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  3. insidematrix

    AJR Guest

    LAN with internet access requires public IP - internal network access
    utilizes private IP. no internet access - no public IP required.
    AJR, Jun 7, 2006
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