Stateful inspection firewalls -- also known as dynamic packet-filtering firewalls -- maintain a table that keeps track of all open connections. When new packets arrive, the firewall compares information in the packet header to the state table and determines whether it is part of an established connection. If it is part of an existing connection, then the packet is allowed through without further analysis. If the packet doesn't match an existing connection, it is evaluated according to the rule set for new connections.
Stateful inspection firewalls monitor communication packets over time and examine both incoming and outgoing packets. Outgoing packets that are requests for specific types of incoming packets are tracked, and only those incoming packets constituting a proper response are allowed through the firewall. Although stateful inspection firewalls are quite effective, they can be vulnerable to denial-of-service (DoS) attacks.
Read More: firewall management services
Stateful inspection firewalls monitor communication packets over time and examine both incoming and outgoing packets. Outgoing packets that are requests for specific types of incoming packets are tracked, and only those incoming packets constituting a proper response are allowed through the firewall. Although stateful inspection firewalls are quite effective, they can be vulnerable to denial-of-service (DoS) attacks.
Read More: firewall management services
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