Flynet: A TCP/UDP tool that supports intranet penetration and port forwarding

flynet is a command line tool written in Golang. For those who are good at using PUBG, its intranet penetration and port forwarding are very practical. It supports both Windows and Linux systems.

Download page : https://github.com/asche910/flynet/releases

1. Installation of Flynet

Windows and Linux users can directly download the corresponding version from the Releases page, and other platforms can download the source code and compile it by themselves.

In Windows, enter the corresponding directory in the command line, .\win-client.exe ... or .\win-server.exe ...
Similarly in Linux, ./linux-server … or ./linux-client …

2. Intranet penetration

To put it simply, it allows the external network to access the machines in the internal network. What the tool does here is to map a port in the intranet to a port on the server, so that by accessing a port on the server, you can indirectly access the port in the intranet. Here’s how:

Server

 server -M forward -L 8888 8080

Client

 server -M forward -L 80 -S asche.top:8888

Also assume that the server domain name is asche.top, then all that is done is mapping the client's port 80 to the server's port 8080, and the data transmission in the middle is completed by the server listening on port 8888. Then we visit asche.top:8080 and see the content on port 80 of the client.