Shared services are services designed to run on multiple NG Firewalls.
For more information, see How to Configure a Shared Service.
The distributed firewall (formerly Cascaded Firewall or cfirewall) is a firewall service distributed across multiple NG Firewalls. It is a variant of the regular firewall service, designed to simplify firewall administration by multiple administrators. The distributed firewall is a shared service and replaces the standalone firewall service. You cannot run a distributed firewall service and a standalone firewall service together on a virtual server.
Fore more information, see Distributed Firewall.
Shared DNS Server
The DNS service can also be used as a shared service distributed across multiple NG Firewalls. Configure the shared DNS service like the standard DNS service.
For more information, see DNS.