En/2.2/Zentyal Unified Threat Manager
From Zentyal Linux Small Business Server
The UTM (Unified Threat Manager) is a more advanced concept than the
firewall. The UTM not only defines a policy based on source or destination, ports or protocols, but
provides the necessary tools to secure your network. These tools allow you to
interconnect different subnets safely, define advanced browsing policies, detect
attacks on your network from Internet or hosts in the internal network,
amongst other options.