dual network isue windows 7 pro

You can't have two networks with the same subnets. Which one should be the default gateway?

It IS possible, but for what you are trying to do, I'd suggest this:

Change one network, doesn't matter which, to be 192.168.1.0/24, this gives you IP addresses 192.168.1.1 to 192.168.1.254 usable, netmask is 255.255.255.0

Set the nameservers to be your ISP (these can be the same for both networks).

Set one router to be the network 192.168.1.1, with the router address being 192.168.1.1 Routers are typically the first address in a subnet, doesn't have to be that way, but it's easier to remember.

Set the IP address on your windows NIC connected to the 192.168.1.x network to be 192.168.1.100, with the default gateway as 192.168.1.1

You should now have two networks, one in the free class A area of 10.0.0.0/8, and one in the free class C network of 192.168.1.0/24 (These are not routeable on the internet).

If both routers are connected to the internet, enable network address translation on both routers, so more than one device behind the router can access the net. If there isn't an internet connection for the second network, no need to enable NAT.

In windows, a "Default Route" needs to be used, this is the routing entry for 0.0.0.0, it should point to the router address with the fastest internet connection.

Hope this helps, post if you have issues. It helps to have a notebook to configure the second router while changing settings in Windows, otherwise you end up at a state in the middle where you don't have connectivity if you don't do it in a precise order.

Source: http://forum.allaboutcircuits.com/showthread.php?t=81460&goto=newpost

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