How to use two network adapters for two different networks on the same computer

Posted on 2014-08-26
Last Modified: 2014-09-01
Is it possible to use two network adapters on the same computer where one network is internal only without internet access.  The other network is a router that is connected to the internet.

This is for a windows xp station.
Question by:Scott Fell,  EE MVE
    LVL 20

    Accepted Solution

    You set one of them up on the internal network with that IP range.  You do not use a default gateway on this card.
    You set the other one to be the outside and add the default gateway on that side.

    Note they MUST have different IP ranges or this will not work.

    Also - it is not really a normal thing to do.... It would be better for a work station to be on just one network and use routers or servers to bridge networks.
    LVL 17

    Expert Comment

    Default gateway must point in direction of internet.
    If more internal network exist then some additional routing must be set up.

    However there only is one DNS, even if you set up different DNS on the 2.
    LVL 3

    Assisted Solution

    Yes.  It's actually quite simple, especially if there is a DHCP server for each network.  Windows will be able to 'see' the Internet on one NIC and automatically set the default route ( to use that NIC.
    LVL 20

    Expert Comment

    Only set up 'routing' if you want people on one side (say the internal network) being able to jump over your connection to get to the other side (say the internet).
    As above - this is a bad idea to use your work station for this.
    What about when you remove it or reboot it.

    You do not need to turn it on, if it is only for you to access bother networks - but again - that is bad design.

    It can be done - but it is probably a bad idea to do it
    LVL 52

    Author Comment

    by:Scott Fell, EE MVE
    The internal network has access to data that is required for reports and is not open to the outside.  The 2nd network is only one other computer connected to a modem/router.    I'm trying to avoid plugging in one CAT cable for network A, then unplug and plug in 2nd cable for the internet.
    LVL 20

    Expert Comment

    Well as above - you can do it by adding a second network card.
    Its not exactly good practice to do this.  Your workstation is running XP.  
    This makes it more likely to be  hackable as it is no longer patched by MS.

    A better idea would be to have a firewall / router and connect it all into that.
    Secure it properly and then live inside your firewalled area.

    ...but... if you don't want to do that - then.... yes.... it works with two network cards :)

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