Usually, unlike stateful-packet filtering firewalls for dynamic data masking, application-layer firewalls are always aware of certain applications, for instance the Web, SQL, and e-mail. Also, these multi-talented firewalls prohibit direct connections from the Internet to your servers by assuming the proxy role between the applications you serve (Web, E-mail, FTP, etc.) to the rest of the wired world.
Decisions based on protocol Enterprise networks can no longer allow or deny traffic based on protocol alone. Now that exploits through common and necessary protocols (HTTP, SMTP, etc…) have become frequent. They must employ firewalls for dynamic data masking capable of inspecting protocol data in the TCP header.
Application-layer firewalls usually act as both client and server, by ‘proxying’ the data between …Read More →