Breaking the Ice: Claude AI Maps TSPU Deep Packet Inspection and Censorship Bypass Methods in Russia
An analysis conducted by Claude AI examines the current state of Russia's TSPU censorship infrastructure as of November 2026, based on real-world testing from the Rostelecom network. The report details how DPI equipment blocks traffic by IP addresses, SNI inspection, protocol signatures, and active probing, with specific freezes occurring after approximately 16 KB on many foreign hosting providers.
TSPU (Technical Means of Countering Threats) consists of deep packet inspection systems installed at major operators including Rostelecom and mobile providers. These systems are centrally managed and apply uniform national policies unevenly across regions and network types. Key blocking mechanisms include IP blacklisting that causes timeouts, SNI filtering in TLS handshakes, verification that SNI matches the actual IP owner, protocol signature detection for VPNs, and active probing where the system connects to suspected servers to verify behavior.
Hosting Provider Restrictions
Testing of HTTPS downloads from 2 to 10 MB revealed that connections to Hetzner, OVH, Vultr, Scaleway, and AWS frequently freeze or drop after the initial TLS handshake. In contrast, providers such as Leaseweb, i3D.net, Serverius, xTom, and certain academic networks showed no such restrictions. Users are advised to test specific IPs before deployment.
Effective Bypass Techniques
Among evaluated methods, VLESS + Reality + XTLS Vision with Chrome fingerprinting on port 443 proved most resilient when paired with a legitimate domain and real website for masking. Cascaded setups using a Russian entry node followed by an international exit node further improve stability by avoiding direct international traffic inspection. Local tools like zapret, GoodbyeDPI, and ByeDPI can counter SNI-based slowdowns without requiring external servers.
UDP-based protocols such as Hysteria2 and TUIC remain unstable due to QUIC and UDP throttling. Classic VPN protocols including OpenVPN and WireGuard are reliably detected and blocked when used directly. The report recommends self-hosted domains with Let's Encrypt certificates, SMTP and BitTorrent filtering on exit nodes, and periodic monitoring of download speeds to detect freezes.
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