4DNAT

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Introduction

The 4DNAT was named from 4 and DNAT. This tool works in the fourth layer of transport layer of the OSI model, while 4 and for sound, means a tool that is dedicated to the target address conversion. 4dnat develops using Go language, has natural cross-platform, and uses the GO standard library development, without any third-party dependence, only one binary executable after compiling. It has four working modes:

Forward

Accept two parameters, listen port, and destination addresses, actively connect the target address after receiving the request in the listening port, example:

./4dnat -forward 2222 192.168.1.100:22

Listen

Accept two parameters, listen port 1 and monitor port 2, and exchange data received by two ports, example:

./4dnat -listen 10000 10001

Agent

Accept two parameters, target addresses 1, and destination address 2, actively connect these two target addresses after startup, and exchange data received by the two ports, example:

./4dnat -agent 127.0.0.1:10000 127.0.0.1:22

http/https proxy

Accept two parameters or four parameters, proxy types, listener ports, certificate paths, and private key paths, examples:

http proxy

./4dnat -proxy http 1080

https proxy

./4dnat -proxy https 1080 server.crt server.key