If no further Firewall rule will be entered, the local area network is protected by the interaction of Network Address Translation and Stateful Inspection: Only connections from the local area network produce an entry in the NAT table, whereupon the LANCOM opens a communication port. The Stateful Inspection supervises communication via this port: Only packets, which belong exactly to this connection may communicate via this port. For accesses from the outside to the local network results thus an implicit "Deny All" strategy.