AminMGMT/BackPack

Backpack is a high-performance tunnel engine written entirely in Go, purpose-built for Iran ⇄ abroad (kharej) server setups. One self-contained binary with an interactive CLI and a secured web dashboard — run and manage everything with or without a terminal.

It carries a tunnel three ways: reverse (kharej dials Iran), direct (Iran dials out), and a full IP tunnel that puts both servers on one private network.

An end user connects to a forwarded port on the Iran server; the engine carries it through one transport to the kharej client, which hands it to the real service. In the reverse tunnel above the connection is dialed by the client (kharej → Iran), so the far side needs no open inbound port.

The ports never move: Iran exposes them, kharej holds the real service. What changes is who reaches out first, and what the tunnel carries.

Both are built from Setup Iran and Setup Kharej: pick the machine you are on, and the wizard asks which direction you want and writes the config itself.

A direct tunnel is a full IP tunnel — an interface on each host carrying whole IP packets, wrapped in Backpack's own GRE inside a Noise session and handed to one of three carriers. It measures its own MTU once it is up, which is the setting that fails worst when it is wrong.