Firewall

It's a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.

Status

ufw status
ufw status verbose

Enable/Disable the Firewall

ufw enable

ufw disable

Set Default Policies

# Allow all
ufw default ALLOW

# Deny all
ufw default DENY

Rules

• Allow

  ufw allow 22
  ufw allow 22/tcp
  ufw allow 80
  ufw allow 80/tcp
  
  # Allow the given ip address access to port 22 for all protocols
  ufw allow from <ip> to any port 22

• Deny

  ufw deny 22
  ufw deny 22/tcp
  ufw deny 80
  ufw deny 80/tcp