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Multiple NICs in XP Pro Machine

Discussion in 'Networking (Hardware & Software)' started by BlueLine, 2006/04/24.

  1. 2006/04/24
    BlueLine

    BlueLine Inactive Thread Starter

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    I have 3 nics in a machine.

    nic1 = Internet
    nic2 = Internal Network
    nic3 = WAN connection (through internet)

    I need to have all three networks active at all times.

    I have a piece of software (FORVUS) and a website that needs to be accesed through nic3. But it attempts to use nic1 and then it just displays that site cannot be found. I need to get the information from nic3.

    Is there a way to have the machine try one nic and then move on if it does not get a response. I was reading about binding changes but will that effect everything.

    At this time all 3 networks are necesssary cannot bridge or delete any of them. If i disable the first 2 nics then the software and website work correctly.

    If anyone can help out i would appreciate it greatly.

    THANKS TO ALL!!!
     
  2. 2006/04/24
    Miz

    Miz Inactive Alumni

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    Miz,
    #2

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  4. 2006/04/24
    BlueLine

    BlueLine Inactive Thread Starter

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    That is for one nic on multiple networks. This machine has 3 nics on 3 networks. Thanks but that is not my answer. I cannot have these networks cross or i would just bridge them. They must stay seperate
     
  5. 2006/04/25
    ReggieB

    ReggieB Inactive Alumni

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    You need to use routing to set up which connection/NIC is used to access any particular network. For this to work, all networks must have unique IP addresses.

    So say you have:

    Network 1. The internet. This is effectively your default route 0.0.0.0
    Network 2. You're LAN on 192.168.0.0/255.255.255.0
    Network 3. A second network perhaps on 10.0.0.0/255.255.0.0

    You need to set your network interface cards (NICs) so that

    NIC 1 (11.11.11.11) connects to Network 1 and has a default gateway setting pointing at you ISP's router (11.11.11.12) .
    NIC 2 (192.168.0.5) is left as default (assuming you only have one internal subnet - if you have more than one you will have to set up routes to these subnets via this NIC)
    NIC 3 (22.22.22.22) - a static route is set up to use this NIC. The route being to the network 3 (10.0.0.0/255.255.0.0), using a VPN tunnel via 22.22.22.21

    Your routing table will look something like:
    Network Destination, Netmask, Gateway, Interface, Metric
    0.0.0.0, 0.0.0.0, 11.11.11.12, 11.11.11.11, 20
    192.168.0.0, 255.255.255.0, 192.168.0.5, 192.168.0.5, 20
    10.0.0.0, 255.255.0.0, 22.22.22.21, 22.22.22.22, 20

    I expect you'll find most of routing table will already be in place (automatically created by the operating system along with additional routes to handle loopback and broadcasts). However, you'll probably have to add a route to Network 3 manually using the "Route Add" command.

    The routing table on this PC will only affect traffic leaving from or directed to this PC, unless you enable packet forwarding. However, it may be a good idea to use a software firewall to enforce an IP policy. If this PC is directly connected to the internet, it needs firewalling anyway.
     

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