Operating Tor Bridges for Russia in the TSPU Filtering Era

The TSPU system operates at deep packet inspection boxes installed at ISP infrastructure interconnection points. Unlike DNS-based blocking or simple IP blocklisting, TSPU can analyze packet content and timing to identify protocol-level signatures. The December 2021 throttling attack used bandwidth throttling rather than outright blocking, degrading Tor connections to unusably slow speeds without technically preventing connection attempts.

Since 2021, the Tor Project has made significant improvements to its blocking resistance specifically in response to Russian TSPU capabilities. The combination of WebTunnel (released 2023), improved obfs4 active probing resistance, and Snowflake's WebRTC architecture has significantly improved availability for Russian users who use current Tor Browser versions.

In 2026, Tor access in Russia is variable across ISPs. Major ISPs appear to implement TSPU blocking more aggressively than regional ISPs. Russian Tor users report that connectivity quality depends heavily on their specific ISP and region. Bridge operators can partially account for this by monitoring user counts by country and correlating with known ISP infrastructure when users report connectivity problems.

obfs4 performs well in Russia for ISPs that implement only IP blocklisting rather than DPI-based throttling. BridgeDB-distributed obfs4 bridges typically survive 2 to 6 weeks before burning through a combination of blocklist updates and active probing. Private obfs4 bridges with trusted distribution last months.

Snowflake shows strong availability in Russia. WebRTC traffic that looks like video conferencing is difficult to throttle specifically because it resembles business-critical applications that TSPU operators are reluctant to degrade. Snowflake was one of the first transports to recover reliable access for Russian users after the December 2021 blocking event.

WebTunnel, if available for your bridge configuration, shows promising results in Russia. Its HTTPS WebSocket traffic pattern closely resembles video conferencing applications which creates blocking reluctance similar to Snowflake's WebRTC. Operators who want to serve Russian users specifically should prioritize deploying WebTunnel as it becomes more widely available in bridge operator configurations.

IP geography matters less for Russian censorship than for Chinese censorship, because TSPU throttling is protocol-based rather than purely IP-based. However, IPs from Eastern European data centers including Romania, Latvia, and Estonia tend to have lower prior blocking history than IPs from US or UK ranges, resulting in marginally longer bridge lifespans.

Avoid ASNs associated with major Russian-operated networks even when the server is physically outside Russia. Some Russian ISPs apply additional throttling to traffic from ASNs historically associated with anti-censorship infrastructure. Fresh IPs from independent European data centers with clean routing history perform best.

Operators who specifically want to maximize Russian bridge availability should maintain a fleet of 5 to 10 bridges distributed across multiple Romanian and Eastern European ASNs. The distribution across ASNs prevents a single TSPU blocklist update from burning the entire fleet simultaneously.

Russian bridge distribution benefits from the large Russian-speaking diaspora communities on Telegram. Russian-language Telegram channels dedicated to circumvention tools have hundreds of thousands of followers. Bridge lines distributed in these channels reach enormous numbers of users but burn extremely fast due to scale.

A more sustainable approach is coordination with established circumvention tool operators who already have verified distribution channels for Russian users. RuNet Echo (formerly Global Voices), Meduza (independent Russian journalism), and Novaya Gazeta networks have published circumvention guides for Russian readers and have established relationships with bridge operators. Contributing bridge capacity to these networks provides high-impact distribution without requiring you to manage the distribution infrastructure yourself.

For operator anonymity when serving Russian users: extra care is appropriate because Russian intelligence services have sophisticated capabilities for tracking circumvention infrastructure and operator identities. Use the full anonymous hosting setup with Monero payment and pseudonymous email, and avoid any distribution activity through accounts that link to your real identity.