In the past I have set up this sort of system with totally different IP ranges.
For instance:
1.
Local Network in the 192.168.1.0 range using a server to provide DHCP or a local router to provide DHCP. Router/Server on 192.168.1.1
Internet Network in the 10.0.0.0 range. Router providing DHCP to the Internet NICs.
There are problems with this kind of setup especially if DNS gets messed up.
2. Another way would be to have the Internet Router send its data to the Local Router and then on to the PC's although that would give hackers more direct access to the PC's then.
I prefer option 1 for security reasons...
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