FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
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Article Id 196980
Article
FortiGate Antivirus Firewalls are optimized as in line security devices but its flexible design allows the FortiGate to be deployed as an offline intrusion detection system, monitoring network traffic from mirrored or spanned switch ports or using a network tap device to forward incoming and outgoing data streams to multiple Ethernet ports.

The document provides deployment scenarios and FortiGate IPS configuration.