Firewall

Contents

1. UFW

UFW #

ufw, uncomplicated firewall is a simple firewall command line utility.

Example: Setup for SSH #

This will block all incoming connections by default and creates an execption for SSH (port 22):

ufw default deny incoming
ufw allow in ssh
ufw enable

Warning: if you are running this on a VPS you can be locked out if you acidentaly block your SSH port. You can fix this by opening the recovery environment and running ufw disable.

Enable/disable #

• ufw enable
• ufw disable

Status #

• ufw status
• ufw status verbose

Open ports #

• ufw allow 1234
• ufw allow in 1234
• ufw allow out 1234
• ufw allow in 1234 comment 'Description here'

Remove rules #

1. Run ufw status numbered to show all rules with a number
2. Run ufw remove [number] to remove a rule