Unified Threat Management (UTM)
Our network devices have many features in one box, including junk
email filtering, anti-virus capability for emails, an intrusion detection
system (IDS), and world wide content filtering along with the traditional
activities of a firewall. V4 is an application layer firewall that
uses proxies to process and forward all incoming traffic, though it
can still work frequently in transparent mode. However, if this uses
too much processor time, the higher-level inspection can be disabled
so that the firewall functions like a much simpler network address
translation (NAT) gateway. |

