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Stateful Packet Inspection (SPI) firewall
More than just a “NAT” firewall, there is a powerful Stateful Packet
Inspection (SPI) firewall in the router. Stateful inspection
compares certain key parts of the packet to a database of
trusted information. SPI Firewall is unlike the normal firewall that
only checks the headers of the packets, it also scrutinizes the
contents of the packets, ensuring the integrity of the packets.