What Is Deep Packet Inspection?
Deep Packet Inspection (DPI) is a technology that examines the full content of network packets as they pass through a checkpoint, rather than just looking at header information. DPI systems can identify the application, protocol, and even specific content within encrypted traffic by analyzing packet sizes, timing patterns, and handshake signatures.
Governments in countries like China, Russia, Iran, and Turkey deploy DPI at the national ISP level to detect and block VPN traffic. Even when the content is encrypted, DPI can recognize the characteristic patterns of VPN protocols.
How DPI Detects VPN Traffic
DPI uses protocol fingerprinting (recognizing unique handshake patterns), statistical analysis (detecting patterns in packet sizes and timing), and payload inspection (examining unencrypted metadata). Sophisticated DPI systems combine machine learning with these techniques.
How VPNWG Defeats DPI
VPNWG uses Amnezia obfuscation on top of WireGuard, which randomizes packet sizes, adds padding, and modifies handshake patterns to make VPN traffic indistinguishable from regular HTTPS traffic. Learn how VPNWG bypasses DPI.