How can we check that office computers cannot reach our tills?
Test it from an office computer, and then watch the traffic to see whether anything crosses that should not. A simple test: from an office PC, try to reach a till's address, for example with a ping or a connection to its management port, and confirm that it fails. Repeat after any change to the network or the router. Testing shows the rule works at that moment; watching shows whether anything uses a path you did not know about. A network sensor on a mirror port that sees both segments shows every connection between them. NetSenX lists who talks to whom on the network map on every plan and flags scanning or new sessions toward the tills as alerts.
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