As of May 2024, DPI-bypass tools including DPI Tunnel and GoodbyeDPI no longer function for circumvention in Iran, indicating that Iran's filtering infrastructure has become effective against obfuscation-only tools that require no remote proxy server.

In Iran circa mid-2024, V2Ray-based protocols (VLESS/VMess via subscription services) emerged as the recommended practical replacement for failed DPI-bypass tools, with open-source clients MahsaNG and Oblivion cited as accessible entry points.

Abstract / thread summary deployment

V2Ray NG and comparable clients require a third-party remote server to operate; user-side configuration alone is insufficient, establishing distributed server infrastructure as a necessary dependency for Iran-targeted circumvention as of 2024.

Abstract / thread summary deployment

Stage 1 of the detection pipeline uses a lightweight heuristic: restrict analysis to IP addresses in "VPS-dense ASNs," which censors already target for resource-intensive inspection of fully-encrypted traffic. This pre-filter dramatically reduces the search space before applying the more expensive dual-role behavioral analysis. The evaluation was conducted without Stages 1 and 3 due to dataset limitations, meaning the reported 23% recall and 0.18% FPR are conservative lower bounds on the full pipeline's performance.

2026-almutairi-server §2.1, §2.2, §3.4 fully-encrypted-detectdpiml-classifier

Based on analysis of over 100,000 leaked Geedge Networks documents, InterSecLab (2025) found that Geedge supplied China-GFW-equivalent censorship and surveillance systems to Kazakhstan, Ethiopia, Pakistan, and Myanmar. The systems include deep packet inspection, real-time mobile user monitoring, fine-grained traffic control, regionally customizable censorship rules, and — per WIRED's reporting — ML-based extraction of metadata from encrypted traffic to determine whether a flow is likely from a VPN or circumvention tool.

2026-anon-2026-27-vpn §8 (InterSecLab / WIRED section) dpiml-classifierfully-encrypted-detecttraffic-shape

LetsVPN permanently exited the Chinese mainland market in late April 2026 after its technical team spent 20 days making hourly adjustments and confirmed it could not restore connectivity. The official announcement designated April 8, 2026 as the effective service-termination date and initiated a full refund program.

2026-anon-letsvpn-vpn Official announcement & §Introduction dpitls-fingerprintfully-encrypted-detect

Explicitly disentangling packet headers (structured, low-entropy) from encrypted payloads (high-entropy, stochastic) into separate MoE branches yields consistent gains across six datasets: 86.85% F1 on 120-class TLS 1.3 traffic (CSTNET-TLS), 97.88% F1 on USTC-TFC2016 malware/benign flows, and 92.65% F1 on imbalanced IoT traffic (CIC-IoT2022), demonstrating that headers and payloads carry fundamentally different and independently exploitable discriminative signals.

2026-he-trafficmoe-heterogeneity-aware-mixture §III-A, §IV-B, Tables II–III ml-classifierdpifully-encrypted-detect

Two Iranian ASes apply a protocol allowlist that drops traffic not matching known application-layer protocol patterns (after ~6 packets), independently of the destination IP. Experiments with fresh /26 phantom subnets showed that prefixing Conjure connections with a plain HTTP GET payload evaded this blocking for four weeks, while TLS Client Hello-prefixed and SSH-prefixed connections were blocked within 72 hours (TLS) or 72 hours after port rotation (SSH). HTTP GET on port 80 was the only tested prefix that survived the full experiment window.

2025-alaraj-iran-refraction §4.4, §5 dpifully-encrypted-detect

Iran's June 2025 shutdown enforced a strict national protocol whitelist: only DNS (UDP/53), HTTP (port 80), and HTTPS (port 443) traffic from Iranian networks to external servers was forwarded; all other protocols—including OpenVPN (UDP/1194), SSH (port 22), and arbitrary TCP/UDP ports—were silently dropped without response by DPI at the border.

2025-aryapour-stealth-blackout §4.4 dpiport-blockingfully-encrypted-detect