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.