P.S. The other private IP ranges that will work (like 192.168.x.x) are 172.16-31.x.x and 10.x.x.x.
And yes, having two NICs is useful for various reasons. I have one computer acting as a router for my home network (one NIC connected to internet, one connected to my LAN, acting as a DHCP server), and at work, I have a computer hooked to the main corporate LAN, and another NIC hooked to a private server/testing LAN. (As a side note, the main LAN is on a 192.168.1.x network, and the testing lan is on a 10.0.0.x network).
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