[Security] ufw

# Check status
sudo ufw status verbose 
 
# Allow port enter
sudo ufw allow <port_number> 
e.g. sudo ufw allow 22
 
# Common port list
# 22 (FTP / SSH)
# 25 (SMTP)
# 53 (DNS)
# 80 (HTTP)
# 443 (HTTPS)
# 587 (secure SMTP)
# 3306 (MySQL)
# 5432 (PostgreSQL)
 
# Deny port enter
sudo ufw deny <port_number> 
e.g. sudo ufw deny5432
 
sudo ufw default deny incoming
sudo ufw default allow outgoing
 
# Enable number
sudo ufw enable
 
# Shows list
sudo ufw status numbered
 
# Delete specific rules
sudo ufw delete <rule-number>
 
e.g. sudo ufw delete 2
 
# Block / Allow ip
sudo ufw deny from <IP> to any 
e.g. sudo ufw deny from 192.168.1.5 to any
 
# Block / Allow ip from specific port
sudo ufw allow from <IP> to any port <port-number>
sudo ufw deny from <IP> to any port <port-number>
 
e.g. sudo ufw allow from 102.32.100.42 to any port 80