UFW

General Info 

 By default, UFW is set to deny all incoming connections and allow all outgoing connections. This means anyone trying to reach your server would not be able to connect, while any application within the server would be able to reach the outside world.  

 So  make sure to allow ssh before enabling UFW!!! UFW requires you to add / deny ports in a certain order, if you want to allow a certain ip access a port but deny access by everyone else, the ip must be allowed first then deny all after 

 

 Setup 

 sudo apt update && sudo apt install -y ufw 

 

 Basic Management 

 Turning UFW on:  

 ufw enable 

 Turning UFW off:  

 ufw disable 

 Check if UFW is enabled or disabled 

 sudo ufw status 

 Allowing access from a particular IP to ANY port 

 sudo ufw allow from IP_ADDRESS 

 Allowing access from a partiular IP to A SPECIFIED port: 

 sudo ufw allow from IP_ADDRESS to any port PORT_NUMBER 

 Allowing any access to a specified port: 

 sudo ufw allow PORT_NUMBER 

 Denying access to a specific port  

 sudo ufw deny PORT_NUMBER 

 List rule numbers 

 sudo ufw status numbered