Ok I hope this doesn't sound too dumb, but a firewall only works one way right? I mean, external systems can't see/hack computers behind a firewall, but the computers behind a firewall can see/hack each other?
But it deponds on where the firewall is. If the firewall is deployed at the gateway, then what you described is true. If one is deployed per machine, then none of them can access each other, unless you poke holes in the wall.
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