Traditional stateful packet inspection firewalls are obsolete against modern encrypted malware and lateral traversal attacks. SMB perimeters require Layer 7 Next-Generation Firewalls (NGFW) enforcing Zero Trust Network Access (ZTNA).
1. Core NGFW Security Engine Modules
| Security Subsystem | Detection Mechanism | Throughput Impact | Mitigated Attack Vectors |
|---|---|---|---|
| Deep Packet Inspection (DPI) | Full TLS/SSL Certificate Decryption & Re-encryption | 15–30% CPU Overhead | Encrypted C2 beaconing, payload smuggling |
| Intrusion Prevention (IPS) | Heuristic & Signature-based RFC Protocol Validation | 5–10% Overhead | Zero-day exploits, CVE buffer overflows |
| DNS Sinkholing | Real-time threat intelligence domain interception | < 1% Overhead | Phishing redirection, fast-flux botnets |