PacketAlarm unites intrusion detection and prevention, a multi-inspection firewall and a vulnerability scanner in one system. This provides companies with comprehensive protection against attacks which covers both the gateway and the internal network. The central web based management tool can also be used to provide extensive protection to subsidiaries and field offices. To ensure maximum protection, PacketAlarm works with a two-tiered security concept. In the first tier, incoming data encounters the PacketAlarm firewall. Undesired communications are rejected. In the second tier, the PacketAlarm Intrusion Detection and Prevention System analyze the data that is allowed to pass through the firewall. The prevention module immediately blocks attacks and the detection module sends alarms about them. Safe data traffic flows on uninterrupted.