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SPI

SPI

Stateful Packet Inspection. A firewall mechanism which examines each incoming network packet and only allows through those packets which are for a known open connection.

Relevant links:

www.firewall-software.com/firewall_tech/stateful_packet_inspection.html - Description of Stateful Packet Inspection.
http://everything.explained.at/Stateful_firewall/ - Stateful Firewall Explained.

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