How a Stateful Firewall Works. A stateful firewall collects data regarding every connection made through it. All of these data points form profiles of “safe” connections. When a subsequent connection is attempted, it is checked against the list of attributes collected by the stateful firewall.

How does stateful inspection firewall work?

Stateful packet inspection is a technology used by stateful firewalls to determine which packets to allow through the firewall. It works by examining the contents of a data packet and then comparing them against data pertaining to packets that have previously passed through the firewall.

What does a stateful firewall do?

What is a stateful firewall? Stateful firewalls monitor all aspects of the traffic streams, their characteristics and communication channels. These firewalls can integrate encryption or tunnels, identify TCP connection stages, packet state and other key status updates.