Fortinet · Firewalls
FortiGate 120G
NGFW for campus networks and enterprise edges.
Overview
FortiGate 120G integrates network security and connectivity through FortiOS. Model selection should consider actual traffic, SSL inspection, FortiGuard services, VPN, high availability and environment growth.
Key features
- Published performanceMaximum figures from the official Fortinet matrix for July 2026.
- Engineering-based sizingFinal sizing accounts for active services, topology, redundancy and expansion.
- Security FabricIntegration with the Fortinet ecosystem according to the defined architecture.
Technical specifications
| Accelerated ports — GE RJ45 ports | 16 |
|---|---|
| GE RJ45 management / HA | 1 / 1 |
| Accelerated ports — GE SFP slots | 8 |
| Accelerated ports — 10 GE SFP+ FortiLink slots (default) | 4 |
| USB | 1 |
| Console RJ45 | 1 |
| Local storage | FG-120G: no local data SSD is listed. Variant FG-121G: 480 GB SSD. |
| Dedicated TPM | Yes |
| Bluetooth Low Energy (BLE) | Yes |
| Physical signed-firmware switch | Dash in the datasheet: feature not listed for this SKU |
| Power input | 100-240VAC, 60-50Hz |
| Hardware acceleration | SP5 |
| Documented optional DAC cables | 10 GE SFP+ passive DAC cable 1m (FN-CABLE-SFP+1); 10 GE SFP+ passive DAC cable 3m (FN-CABLE-SFP+3); 10 GE SFP+ passive DAC cable 5m (FN-CABLE-SFP+5) |
| PoE, Wi-Fi and cellular connectivity | PoE output, a Wi-Fi radio and a 5G cellular modem are not listed for this SKU in the datasheet consulted. |
| IPS | 5,3 GbpsEnterprise Traffic Mix; logging enabled. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to). |
|---|---|
| NGFW | 3,1 GbpsEnterprise Traffic Mix; firewall, IPS and Application Control enabled; logging enabled. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to). |
| Threat Protection | 2,8 GbpsEnterprise Traffic Mix; firewall, IPS, Application Control and Malware Protection enabled; logging enabled. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to). |
| Firewall — UDP 1518/512/64 bytes | 39 / 39 / 28 GbpsLaboratory results; actual performance varies with configuration and traffic. UDP packets of the sizes specified in the metric. |
| Firewall latency — UDP 64 bytes | 3.17 μsLaboratory results; actual performance varies with configuration and traffic. UDP packets of the sizes specified in the metric. |
| Packet forwarding | 42 MppsLaboratory results; actual performance varies with configuration and traffic. |
| IPsec VPN — throughput (512 bytes) | 35 Gbps512-byte packets; AES256-SHA256 encryption. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to). |
| SSL-VPN — historical throughput | 1,5 GbpsPublished historical capacity; SSL-VPN tunnel mode was removed from all models as of FortiOS 7.6.3 and replaced by IPsec VPN. SSL inspection is a separate function. |
| SSL inspection — throughput | 3 GbpsIPS; average across HTTPS sessions with different cipher suites. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to). |
| SSL inspection — new connections/s | 2100IPS; average across HTTPS sessions with different cipher suites. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to). |
| SSL inspection — concurrent sessions | 315 000IPS; average across HTTPS sessions with different cipher suites. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to). |
| Application control — HTTP 64 KB | 6,7 GbpsHTTP 64 KB; logging enabled. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to). |
| CAPWAP — throughput (HTTP 64 KB) | 35 GbpsHTTP 64 KB. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to). |
| IPv6 firewall — performance | No separate IPv6 value is published in the datasheet consulted. |
| Concurrent TCP sessions | 3 million |
|---|---|
| New TCP sessions per second | 140 000 |
| Firewall policies | 10 000 |
| Site-to-site IPsec tunnels | 2000 |
| Client-to-gateway IPsec tunnels | 16 000 |
| SSL-VPN — historical concurrent users (recommended maximum) | 500Published historical capacity; SSL-VPN tunnel mode was removed from all models as of FortiOS 7.6.3 and replaced by IPsec VPN. SSL inspection is a separate function. |
| VDOMs — default / maximum | 10 / 10 |
| Managed FortiSwitches — maximum | 48 with FortiOS 7.6.1+; 32 in earlier versions |
| Managed FortiAPs — total / tunnel | 128 / 64 |
| FortiTokens — maximum | 5000 |
| High availability | Active-Active, Active-Passive, Clustering |
| Dimensions (H × W × D), inches | 1.73 x 17 x 10 |
|---|---|
| Dimensions (H × W × D), mm | 44 x 432 x 254 |
| Weight | 12.17 lbs (5.52 kg) |
| Form factor and mounting | Rack, 1RU |
| Power supply efficiency | Not applicable (N/A in the datasheet) |
| Redundant power supplies | Yes (two fixed factory-installed AC power supplies for 1+1 redundancy) |
| Maximum current | 1.0A @100V, 0.5A @240V |
| Power consumption — average / maximum | 38 W / 40 W |
| Heat dissipation | 138 BTU/hr |
| Operating temperature | 32°F to 104°F (0°C to 40°C) |
| Storage temperature | -31°F to 158°F (-35°C to 70°C) |
| Humidity | 20% to 90%, non-condensing |
| Noise | 49 dBA |
| Airflow | Front-to-rear airflow |
| Operating altitude | Up to 10 000 ft (3048 m) |
| Compliance | FCC Part 15B, Class A, CE, RCM, VCCI, UL/cUL, CB, BSMI |
| Certifications | USGv6/IPv6 |
| FortiGuard licensing and support | FortiGuard services and FortiCare support depend on the purchased bundle or subscription; hardware alone does not imply that all services are included. |
|---|---|
| SSL-VPN and FortiOS version | Published historical capacity; SSL-VPN tunnel mode was removed from all models as of FortiOS 7.6.3 and replaced by IPsec VPN. SSL inspection is a separate function. |
| Lifecycle and document review | End of Order / End of Support are not stated in this datasheet; confirm the official milestones for each SKU before purchasing. |
Figures published by the manufacturer. Final sizing depends on the environment, enabled services and traffic profile.