Stunnel configuration example using Telnet

Introduction

This article provides a guide on how to configure stunnel and use telnet protocol for devices to interact with each other securely. These configurations can be implemented on RUT9xx and RUTX series.

• First you want to make sure that you have ADVANCED mode enabled. This will allow you to choose from a larger variety of settings.

( add image) Stunnel is an open-source proxy service that adds TLS encryption to clients and Servers already existing on a VPN network. TLS encryption provided by Stunnel can be used as an additional layer of encryption for data sent by OpenVPN. This procedure increases the security of the established connection and provides higher chances of passing a Deep packet inspection (DPI) check.

Telnet is an application protocol used on the internet or LAN to provide a bidirectional interactive text-oriented communication using virtual terminal connection like Putty. However, due to serious security concerns of using Telnet over an open network, SSH became favorable.

This article provides an extensive configuration example with details on how to create a tunnel connection using stunnel instances and then connect them using telnet protocol, with the data encrypted