Flash proxies successfully relayed Tor traffic from within China in December 2011, but the test relied on a simple HTTP-based rendezvous blockable by IP address; the authors identify rendezvous — getting just a few bytes (the client's IP address) out of the censored region — as the bottleneck that determines whether the entire proxy system remains operational.

Because browser-based proxies can only initiate outbound connections, flash proxies connect to censored clients rather than the reverse, requiring the facilitator to maintain a registry of client IP addresses; a censor can impersonate a legitimate flash proxy to query the facilitator and enumerate the IP addresses of circumvention users.

§5.1 detection

Applying Little's law to measured traffic parameters (mean inter-arrival time 1/λ = 1407.6 s, mean visit duration µ = 285.8 s), 100 volunteer web pages each embedding the flash proxy badge can support approximately 203 simultaneous censored clients; capacity scales linearly, so 1,000 such pages support ~2,030 clients.

§4.3 evaluation

Flash proxies provide mean throughput of 79.7 KB/s when uninterrupted — comparable to direct Tor (69.5 KB/s) — but throughput drops to 56.6 KB/s (20–40% lower) when proxies alternate on 8-second duty cycles, with most variance attributable to Tor circuit reconstruction overhead rather than transport switching.

§4.2 evaluation

Flash proxy tunnels carry inherent network-level fingerprints that survive application-layer obfuscation: WebSocket connections begin with a plaintext HTTP upgrade handshake followed by structured binary framing, and Flash socket connections open with a crossdomain XML policy request — both are distinguishable from ordinary TCP by a DPI middlebox.

§5.1 detection

The June 2025 Iran shutdown—carried out during the Iran-Israel war beginning ~June 19—did not use BGP route withdrawals as in 2019. Instead, authorities applied service-level restrictions at the national border: DNS poisoning of foreign destinations, protocol whitelisting permitting only pre-approved domestic services, and DPI to block circumvention-tool traffic. Iran's international traffic fell roughly 90% while the country's BGP routes remained advertised, making the shutdown invisible to BGP-based monitoring systems. OONI measurement volume, which totalled 121,333 in June 2025, collapsed to under 200 submissions on June 19-20.

2025-iran-shutdown-measurement Executive Summary / §2 dpidns-poisoningport-blockingip-blocking

Article 19 documents that Iran's National Information Network (NIN / SHOMA) was designed with explicit reference to China's Great Firewall as a model, with institutional mirroring: Iran's Supreme Council of Cyberspace parallels China's Cyberspace Administration of China, and both governments share a "cyber sovereignty" doctrine used to justify domestic content controls and cross-border technology transfer. The report frames Iran's filtering infrastructure as deliberately architected to replicate GFW capabilities, not as an independently developed system.

2026-article19-tightening-the-net §2, §3 dpisni-blockingdns-poisoningip-blockingbgp-hijackthrottling

Article 19 documents that Iran combines technical filtering with formal coercion of major foreign platforms (including Telegram, Instagram, and WhatsApp) to comply with content removal orders under threat of full blocking. The report notes that Iran's 2022 Women Life Freedom protests accelerated platform blocking when foreign operators refused compliance, demonstrating that the censorship system operates in two modes: coerce-and-allow for compliant platforms, block for non-compliant ones. Domain fronting via these platforms is therefore subject to sudden revocation if political conditions change.

2026-article19-tightening-the-net §6 ip-blockingdns-poisoningthrottling

Brussee measures a systematic pattern of Chinese government websites actively blocking access from outside China (the "reverse Great Firewall"), publishing a CSV dataset of affected domains (available at zenodo.org/records/18172145). The paper frames this outbound geo-blocking as a cybersecurity-motivated practice — Chinese authorities classify foreign access to domestic government infrastructure as an attack surface — distinct from the inbound information control goal of the GFW.

2026-brussee-reverse-great-firewall §3, §5 ip-blockingasn-blackholing

Brussee develops a conceptual framework distinguishing two logics of government geo-blocking: (1) information control (blocking inbound foreign content from domestic users) and (2) data sovereignty / attack-surface reduction (blocking outbound access by foreign actors to domestic systems). Chinese government site blocking of external IPs is motivated primarily by the second logic, creating an asymmetric internet topology where CN citizens cannot reach the outside world, and outside actors cannot probe CN government infrastructure.

2026-brussee-reverse-great-firewall §2, §4 ip-blockingasn-blackholing

ShieldShare demonstrates that an Android application can route all hotspot-client traffic through a VPN tunnel without root access by using a SOCKS5/HTTP/HTTPS proxy layer between the hotspot and the VPN, with per-client traffic accounting and quota management. The system works because Android's native hotspot does not forward VPN routing tables to connected clients; ShieldShare interposes a proxy that handles this. Released as open-source.

2026-edorh-shieldshare §Abstract ip-blocking