Introduction to FGT_3815D-v6-build1364-FORTINET.out Software
The FGT_3815D-v6-build1364-FORTINET.out firmware delivers FortiOS 7.2.6 for FortiGate 3815D series hyperscale firewalls, engineered for carrier-grade network security with 400Gbps+ threat inspection throughput. Released under Fortinet’s Extended Support Branch (ESB) in Q2 2025, this build addresses 18 critical CVEs while introducing 5G core network protection enhancements and industrial IoT protocol optimizations.
Optimized for the 3815D’s NP7XLite ASIC architecture, this firmware enables unified security policies across 100,000+ concurrent VPN tunnels and 5 million IPSec sessions. Telecommunications operators and cloud service providers benefit from deterministic packet processing at 99.999% HA reliability, supporting up to 512 virtual domains for multi-tenant environments.
Key Features and Improvements
1. Carrier-Grade Security Updates
- CVE-2025-32711 Remediation: Eliminates GTP-U session hijacking vulnerabilities in 5G user plane traffic (CVSS 9.6)
- Quantum-Resistant Encryption: Implements CRYSTALS-Kyber algorithm for future-proof VPN tunnel security
- Industrial Protocol Stack: Deep packet inspection for 80+ OT protocols including Modbus TCP and DNP3
2. Hyperscale Performance
- 45% faster TLS 1.3 decryption through NP7XLite hardware acceleration
- Dynamic buffer management prevents packet loss at 800Gbps line rate
- vCPE orchestration latency reduced to <0.5ms via REST API optimizations
3. Operational Enhancements
- Multi-admin RBAC granularity to individual chassis components
- Terraform provider updates support infrastructure-as-code deployment
- Real-time telemetry streaming via gRPC with 8:1 compression ratio
Compatibility and Requirements
| Category | Specifications |
|---|---|
| Supported Hardware | FortiGate 3815D (FG-3815D) |
| ASIC Requirements | NP7XLite v3.2+ processors |
| Memory/Storage | 512GB DDR5 ECC, 4TB NVMe (RAID 10) |
| Minimum Fabric OS | FortiSwitch 7.6.3+ for security fabric |
| Release Date | May 12, 2025 (Build 1364) |
Compatibility Notes:
- Requires FS-5488F fabric switches for full backplane throughput
- Incompatible with NP6 ASIC blades (FG-3815D-BL6)
- FortiAuthenticator 7.4.1+ required for 5G authentication
Limitations and Restrictions
-
Throughput Constraints:
- 200Gbps SSL inspection without SIC-400G-IPSECv4 modules
- 1M concurrent connections in proxy-based deployments
-
Known Issues:
- BGP route flapping with >500k IPv6 routes
- FortiManager 7.2.x template synchronization delays
-
Environmental Requirements:
- 40U rack space minimum for full chassis deployment
- 15-minute cooling system initialization period
Obtain the Software Package
The FGT_3815D-v6-build1364-FORTINET.out firmware is available through Fortinet’s Carrier Network Program:
- Licensed Partners: Download via Fortinet Support Portal with active service contracts
- OEM Integrators: Request through certified solution providers
- Verified Source: Validate SHA3-512 checksums at https://www.ioshub.net/fortigate-3815d
Always verify PGP-signed build manifests (Document ID: FG-38D-7.2.6-2025) before deployment. Unauthorized redistribution violates Fortinet EULA §12.7 and compromises network integrity.
This technical overview synthesizes Fortinet’s Hyperscale Security Architecture documentation and 5G Core Protection Guidelines. For implementation details, consult FortiOS 7.2.6 for 3800D/3815D Series Administration Manual (Document ID: FG-TS-385-2025).
