esrrhs/pingtunnel

Pingtunnel is a tool that wraps regular internet traffic inside ping packets so it can pass through network restrictions that would otherwise block it. Most internet connections use protocols called TCP and UDP. Some networks block those while still allowing ping, a simple diagnostic command that sends a different type of packet called ICMP. Pingtunnel takes advantage of this gap: it disguises your TCP or UDP traffic as ICMP ping packets, routes it through a server you control, and delivers it to the intended destination on the other side. Setting it up requires two machines: a server with a public internet address, and a client on your local network. You download the server binary, run it with administrator privileges on the public machine, then run the client on your own computer pointing at that server. The client intercepts your traffic on a local port and forwards it through the tunnel. Three modes are supported: SOCKS5, which acts as a general-purpose proxy that works with many apps, direct TCP forwarding, and UDP forwarding. Both ends can run as a Docker container instead of a raw binary, which makes setup more consistent across operating systems. An Android client built by a community contributor is also available for mobile use. Client and server authenticate each other using a shared numeric key you choose when starting both sides. The tool is written in Go and available for Windows, Linux, and macOS. The README includes a note that the tool is intended for study and research only and should not be used for illegal purposes.