Configuring two NICs on XP Pro and Win 2003

Discussion in 'Server Networking' started by xfile, Jan 13, 2006.

  1. xfile

    xfile Guest


    Appreciated if anyone can help me on how to configure 2 LAN cards on Windows
    XP Pro and Windows 2003 Server.

    Problem is that when two LAN cards are installed, intranet will loss. That
    means including DNS is lost, existing computers trust are lost, and so on.

    Is there a way that we can specify which NIC to be used as the primary NIC?

    xfile, Jan 13, 2006
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  2. xfile

    Jerry Guest

    Try doing a Google search on 'two NICs" or 'two internal NICs' (no quotes) -
    I foudnd quite a few pages/articles.
    Jerry, Jan 13, 2006
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  3. xfile

    Bill Grant Guest

    Why do you need two NICs in the machine? What are you planning to use
    the second NIC for?

    Could you describe what you are trying to do. Is one NIC in a private
    LAN and one on the Internet? Do you want the machine to work as a router?
    Bill Grant, Jan 13, 2006
  4. xfile

    xfile Guest


    Done many times or won't post here.

    xfile, Jan 13, 2006
  5. xfile

    xfile Guest



    For the Windows 2003 server, the second NIC was added for trying to set up
    an VPN.

    According to the wizard, we need two NICs and set up one for the Internet
    and one for the private network.

    At one point, we did succeed in connecting to VPN server, but we could not
    use the network resources. At the same time, local DNS cannot be seen by
    other client computers using intranet anymore and all trust relationships
    were gone.

    Since we spent too much time on VPN but could not make it work, so we
    decided to remove the VPN and in hope to restore the original intranet
    environment and use Remote Desktop for the time being, and keep the second
    NIC installed (but deactivated) for a while. But even doing that could not
    bring back the intranet.

    For the XP Pro box, the onboard NIC does not have WOL (wake on LAN), so
    installed a second NIC with WOL support. This is also not intended to be
    used as a router. We really only needs one NIC for this machine, but thought
    there will be no harms if both are there. Well, it could be very wrong.

    So my questions are:

    (1) For Win 2003 VPN, are there any configurations for the NIC using for
    Internet? Our original configuration was to have auto acquired IP address
    and DNS. For the second one, we assigned it as when we were in the Intranet

    (2) I assumed both NIC are connected to the LAN ports of the router?

    (3) If the XP Pro has two NIC activated and connected to the router, is
    there a way we can assign which NIC to do all the works? I don't know the
    reason, but as long as the onboard LAN chip has been turned on (even without
    any cable connected to the router), all traffics will by-pass the other NIC.

    Thanks in advance and we really don't know much about networking.
    xfile, Jan 13, 2006
  6. xfile

    Bill Grant Guest

    To answer the last question first, on-board NICs can be a problem. If
    you want to use the other NIC, try disabling the onboard NIC.

    Now the numbered questions.

    1. For VPN, if you have two NICs, one NIC needs to be connected to the
    Internet and one to your local LAN. If you are behind a NAT router, you do
    not need two NICs. You have only one NIC , and use port forwarding on the
    NAT router to get VPN traffic to the server.

    2. With two NICs, you would not plug them into the same box. One would plug
    into the LAN hub/switch, the other would connect to the Internet. They would
    be in different IP subnets.

    3. As above, you should not have two NICs plugged into the same hub/switch.

    Have you tried stopping RRAS to restore normal LAN operation?
    Bill Grant, Jan 13, 2006
  7. xfile

    xfile Guest


    Many thanks for your kind explanations, and see if I could comprehend what
    you've said:

    (1) In general, I should not have two NICs (at the same box) both connected
    to a router, or switching box. This will cause problems.

    (2) If we have an NAT router, for which we recently purchased a new Buffalo
    (WHR-G54S), we could use only one NIC and set up NAT table for port
    forwarding (which is another headache). In any case, shall we ignore the
    warning from Win 2003 Server and use custom set up for the VPN?

    (3) I have tried to remove VPN server and RRAS but normal LAN operation
    seems to be lost. I'd try to disable or remove all extra NICs and see if I
    can bring it back.

    xfile, Jan 13, 2006
  8. xfile

    Dash Guest

    You can Specify the IP Addresses to Both of them. Specify your ISP IP to one
    Lan Card & Specify one Internet IP Address by this way you can
    differentiation of Internal & Exter network. You will not loose you Internet
    Dash, Jan 13, 2006
  9. xfile

    xfile Guest

    I got my normal LAN back :)

    I removed both second NIC although there was a little trouble; I did not
    remove from the device manager first so there was so-called "hidden" NIC
    card left, and the infamous "packed scheduler miniport driver" left. I
    eventually solved it.

    Now I will be trying to use one NIC and have the router to forward port to
    the server.

    Hopefully, this will work.
    xfile, Jan 13, 2006
  10. xfile

    xfile Guest


    Thanks for your kind advise, and wish I could try your suggestion before
    removing the NIC.

    Just for the purpose of learning and future preparations, I'd like to
    clarify if I understood your suggestion:

    (1) Physical connection: I assumed your suggestion means to connect one NIC
    to the Internet router and one to the switching box?

    (2) ISP IP: You mean IP assigned by ISP (such as as the
    private IP address of the card or?

    (3) Default Gateway: What about the IP address in the default gateway of the
    two NICs? I got warning from Windows when I tried to assign both to the
    same using the router. I also read an lengthy article from the net
    (although I did not understand 90% of it) about the problem using the same
    default gateway for two NICs on the same machine. In any case, I know it
    won't work but I don't know what will be the other default gateway to use
    other than the router's.

    (4) Preferred DNS: How should I input for this on the two NICs?

    Sorry for so many questions about using two NICs. I am afraid of losing my
    previous internal network again.

    Thanks in advance.
    xfile, Jan 13, 2006
  11. xfile

    Jon Phipps Guest

    this is what I am trying to do on my 2k server box Bill, I am having a devil
    of a time getting the RRAS configured. It seems I can have the
    lan(192.168.254.x) or I can connect to the card that has is the gateway and
    have internet. Right now I cannot do both(which is what my end goal is)
    Jon Phipps, Jan 15, 2006
  12. xfile

    Bill Grant Guest

    The first thing you need to do before you enable RRAS is to make sure
    that the NICs are in different networks. Don't plug them into the same
    hub/switch. RRAS is a router, and needs to have its two NICs in different IP

    The machine can only have one active default gateway. For Internet
    access, this must point out to the Internet. If this is what you want, leave
    the default gateway box on the private NIC blank. This should not prevent
    access to other machines on the 192.168.254 network. They are directly
    connected and do not need to use a default gateway to communicate with each
    other. They do this directly "on the wire" using hardware addressing and
    Bill Grant, Jan 15, 2006
  13. xfile

    Jon Phipps Guest

    yep one will handle the network and the other will handle
    the DSL which is on a totally different network. I seem to hear you saying
    that the rest of the wired and wireless machines connect to the card with addressing handled by WINS and DHCP. Then gated
    out over the other card to the internet. I am going to be finishing this
    configuration tomorrow(when the network is idle).

    Thanks for your help
    Jon Phipps, Jan 16, 2006
  14. xfile

    Bill Grant Guest

    If you configure RRAS as a NAT router it will do that for you.

    You can use the mini-DHCP allocator built into NAT to configure the
    clients automatically if you don't have a DHCP server. DNS should be OK
    unless you are running AD. WINS is a different matter altogether.
    Bill Grant, Jan 16, 2006
  15. xfile

    Jon Phipps Guest

    Thanks for all the information Bill, I have that machine up now as an IP
    router. The only bugaboo was getting the Vonage LD to work. I wanted the
    Vonage router outside the lan however it needed DHCP for an address, I had
    to configure the DSL as a DHCP server to give Vonage its ip, then allow RRAS
    to give addresses to the lan... took much more time than I thought but it is
    running now.

    Jon Phipps, Jan 17, 2006
  16. xfile

    Bill Grant Guest

    Glad to hear it's working.

    Bill Grant, Jan 18, 2006
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