@johnpoz:
If your just running 2 different networks on the same wire (not really a desired setup) - ie switch is just dumb switch without vlan support. Why don't you just run everything on 1 network?
This. Why people steal other people's public IP space like it's RFC1918 is beyond me, can't believe how much I see that. Don't do it, it'll break your ability to connect to the part of the Internet that's really assigned that IP space, and is just wrong. It's also pointless to put those devices on a different subnet in that scenario.