||The traditional role of firewalls has changed. Firewalls now do more than protect a corporate network from unauthorized external access. They can also prevent unauthorized users from accessing a particular subnet, workgroup or LAN within a corporate network. FBI statistics indicate that 70 percent of all security problems originate from inside an organization. According to one in five respondents to the FBI’s survey, intruders broke into, or tried to break into their corporate networks during the preceding 12 months. And most experts agree that the majority of network break-ins go undetected.