UFW_Firewall.md

Intrusion Prevention System (IPS)

sudo apt install ufw

Note

Sets the default policy for outgoing traffic to "allow," permitting any outgoing connections

sudo ufw default allow outgoing

Note

Sets the default policy for incoming traffic to "deny," blocking all incoming connections unless explicitly allowed

sudo ufw default deny incoming

sudo ufw enable

Opens port 80 for incoming HTTP traffic, typically used for web servers

sudo ufw allow 80

Opens port 443 for incoming HTTPS traffic, the secure version of HTTP

sudo ufw allow 443

Opens port 53 for incoming DNS traffic, used for domain name resolution

sudo ufw allow 53

Opens port 3000, which have chosen for SSH access. However, note that this command alone doesn't change the SSH daemon's listening port

sudo ufw allow 3000