Stateful Inspection Firewalls
Stateful inspection firewalls keep track of connection status. Ports can be dynamically opened and closed if necessary for completing a transaction. For example, when you make a connection to a server using HTTP, the server will initiate a new connection back to your system on a random port. A stateful inspection firewall will automatically open a port for this return connection.
Stateful inspection firewalls are considered more secure than packet filtering firewalls. Stateful inspection firewalls process application layer data. Therefore, they are able to take a deeper look into the transaction to understand what is going on.
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