GoodbyeDPI is a Deep Packet Inspection circumvention utility for Windows that bypasses censorship systems blocking access to websites.
The tool addresses the problem of Internet Service Providers using DPI technology to restrict access to certain sites. It handles two types of DPI systems: passive DPI that replies faster than the destination server to redirect users, and active DPI that sits inline in the network path. For passive DPI, the tool identifies and blocks packets with characteristic markers like IP Identification fields of 0x0000 or 0x0001 that carry redirect responses. For active DPI, it employs seven different evasion techniques including TCP-level packet fragmentation, header manipulation such as case mixing and spacing modifications, and sending decoy packets with invalid checksums or sequence numbers to confuse the inspection system.
The tool is designed for Windows 7 through 11 and requires administrator privileges. It provides quick-start scripts for Russia and other countries that automatically configure DNS redirection to prevent DNS poisoning. Users should first verify their ISP uses DPI by enabling DNS over HTTPS in their browser, then run the executable to test if circumvention works. The tool supports various command-line arguments for configuration, including options to specify DNS addresses on non-standard ports and to use blacklists of blocked websites if available for their region. Those whose providers intercept DNS requests can configure the tool to use public DNS resolvers on non-standard ports or integrate third-party DNS over HTTPS or TLS solutions.
Development activity shows consistent engagement with the problem space. The project maintains active issue tracking and responds to user reports about DPI evasion effectiveness across different network conditions. Updates address newly observed DPI behaviors and add support for additional evasion techniques as ISPs deploy new blocking methods. The codebase remains focused on the core circumvention functionality without scope creep into unrelated features.
