Setting up Linux Port Firewall

July 30, 2021

Linux Telnet Port Firewall Configuration

In this post, we will use the telnet port as a test material.
Telnet is a client-to-server or server-to-client protocol that is able to provide remote access to log into certain computer systems that are on a network, in the context of internet usage.

To set the firewall on linux can use a help tool / command called: ufw.
Here we will try:

• install telnet service
• open telnet port
• access telnet

# install telnet service 
$ sudo apt-get install telnetd -y

# check whether the service is running
$ sudo systemctl status inetd

# allow telnet ports
$ sudo ufw allow telnet

# run ufw so it's on system startup
$ sudo ufw enable

# connect to telnet
$ telnet 127.0.0.1

for telnet default port: 23. Can be changed to keep it safe.

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author : doctor. moeclay