Understanding Russia's TSPU: How DPI Filtering, DNS Manipulation and Traffic Throttling Work
Russia's TSPU system combines hardware filters from RDP.ru with EcoFilter and EcoDPI software to perform both simple IP/port/transport blocking and advanced protocol recognition. The platform inspects DNS queries, SNI fields in TLS handshakes, QUIC packets and HTTP headers to enforce domain blacklists or apply throttling. When simple blocking fails, operators fall back to traffic shaping that drops packets or limits bandwidth after an initial window. Multiple bypass techniques including encrypted DNS tunnels, ECH, and specialized proxies such as Hysteria 2, NaiveProxy and Shadowsocks are examined in detail. The article also outlines future developments including expanded residential whitelists and neural-network-based traffic classification.
HabrOct 17, 2026Translated from Russian