ufw (Uncomplicated FireWall) is a program for managing a netfilter firewall which aims to provide an easy to use interface for the user.
You can also look at gui frontends such as gufw or use iptables which has deep learning curve.
First install the ufw package by typing the following command in to the
Terminal:
sudo apt-get -y install ufw|--------------------------------------|---------------------------------------|
| sudo ufw enable | enable ufw |
| sudo ufw status verbose numbered | show status of firewall verbosely |
| sudo ufw default deny incoming | deny all incoming by default |
| sudo ufw allow from 192.168.0.0/24 | allow any protocol from intranet |
| sudo ufw allow 53/tcp | allow incoming tcp packets on port 53 |
| sudo ufw allow SSH | allow ssh from anywhere |
| sudo ufw limit SSH | rate limiting for ssh |
| sudo ufw delete allow SSH | remove standard ssh rules |
| sudo ufw logging on | enable logging |
sudo ufw app list |
list default port for common programs |
|---|