What is active DPI probing, and how does the Reality protocol protect against blocking?

FILTERS TEST SUSPICIOUS SERVERS WITH PROBES, WHILE REALITY REDIRECTS THEM TO A LEGITIMATE WEBSITE.

Network traffic control systems send test probe packets to hidden tunnel servers to identify proxies by their response. Reality technology returns a real certificate and a legitimate port response, tricking automated scanners.

How DPI Active Scanning Works

When DPI algorithms detect atypical encrypted traffic headed to an unknown address, automation sends test probes to the server disguised as a regular user. If the server replies with an error or a non-standard handshake, it is instantly added to blocklists as a tunneling node.

How to Set Up Protection via VLESS Reality

Use a configuration bound to a legitimate foreign portal using TLS 1.3.
Specify a camouflage domain (SNI) that is guaranteed not to be blocked in your target region.
Use private clients like Sing-box or Nekobox with regularly updated Xray cores.
Avoid domains that redirect to other third-party resources.