Ufw setup/configuration

Install ufw

$ sudo apt-get install ufw

Default setup

$ sudo ufw default deny incoming $ sudo ufw deafult allow outgoing

Allowing SSH connections

$ sudo ufw allow ssh $ sudo ufw allow 22

Enabling Ufw

$ sudo ufw enable

Allowing other connections

$ sudo ufw allow http $ sudo ufw allow 80

$ sudo ufw allow https $ sudo ufw allow 443

$ sudo ufw allow ftp $ sudo ufw allow 21/tcp

Specific port ranges

$ sudo ufw allow 6000:6007/tcp $ sudo ufw allow 6000:6007/udp

Specific IP addresses

$ sudo ufw allow from 15.15.15.51

Specific port that the IP addresses to connected to

$ sudo ufw allow from 15.15.15.51 to port 22

Subnets

$ sudo ufw allow from 15.15.15.0/24

Specify the destination port

$ sudo ufw allow from 15.15.15.0/24 to any port 22