Lesson Notes
Firewalls & UFW/iptables
Module 5: Defensive Strategies. Rules for secure ports.
Module 5: Firewalls & UFW/iptables
Firewalls filter traffic by rules. UFW (Linux): ufw allow 22/tcp, ufw allow 443/tcp, ufw enable. iptables basics: chains, allow/deny by port and IP. Rules for secure ports: allow only necessary services (e.g. SSH, HTTPS); block or restrict others. Windows Firewall: inbound/outbound rules. Configure on your lab to enforce least-open ports.
Key Takeaway
Defense in depth: firewalls limit what can be reached. Default-deny and explicit allow lists for secure ports are best practice.