Windows 7 Dual Nic Routing


When more than one network connection is available, Windows uses the
one with the lowest metric value. By default, it automatically
assigns a metric value based on the network connection's rated speed:

An explanation of the Automatic Metric feature for Internet Protocol
routes
http://support.microsoft.com/?id=299540

To force Windows to use a specific network connection, assign a metric
value to each one, giving the lowest value to the desired connection:

1. Open the Network Connections folder.
2. Right click the desired connection.
3. Click Properties > Internet Protocol (TCP/IP).
4. Click Properties > Advanced.
5. Un-check "Automatic metric".
6. Enter a number between 1 and 9999 for the "Interface metric".
--
Best Wishes,
Steve Winograd, MS-MVP (Windows Desktop Experience)

          Dest Ip       Netmask       Gateway
route ADD 10.0.0.0 MASK 255.255.255.0 10.0.0.1

http://www.ni.com/white-paper/12558/en

http://serverfault.com/questions/21455/how-to-configure-dns-on-windows-with-multiple-nics

http://superuser.com/questions/337763/is-there-a-good-dns-server-i-can-install-on-windows-7-for-a-lan