Operating two network adapters simultaneously on a Vista computer(Network)

             You have two network adapters in your Vista PC, which you want to use at the same time for different things. Unfortunately, Windows constantly tries to connect to the Internet through the wrong card—and fails.

             Using two network adapters in the computer for different purposes can be a very practical idea—for example, when one of the adapters is responsible for the Internet connection, while the other one is used for the home-network devices, which are not supposed to have any Internet access. If Windows wants get on to the Internet, it usually uses the Gateway of the first network adapter.
             However, if that is not the adapter, which has the connection to the router, the connection to the Internet fails. Which network adapter can establish which connections, is specified in the routing table.
             You can call the entries of the table using the command ‘route print’, which must be entered in the command prompt (‘Start | Run | cmd’). The standard gateway can be identified in the output of the route-command from the ‘Network destination’ and ‘Network mask’ which are ‘0.0.0.0’ each. For Windows to stop trying in vain to connect to the Internet through the wrong adapter, simply deactivate the standard gateway for this.
              For that, click ‘Network and sharing center’ and then ‘Manage Network Connections’ and open the properties of the Ethernet card by right-clicking on it. After double clicking on ‘Internet protocol Version 4’, you can shut down the gateway by deleting the address that you see in the corresponding field for that adapter.
Note: This change of setting does not affect any connections to any devices in the home network, since these are all usually in the same IP address range.