ufw-cheat-sheet

#!/usr/bin/env bash

# allow port 80 (tcp optional)
sudo ufw allow 80
sudo ufw allow 80/tcp

# block port 80
sudo ufw deny 80

# allow 1433 access for specific IP address
sudo ufw allow from 192.168.101.1 to any port 1433

# allow 1433 access for specific IP address with comment
sudo ufw allow from 192.168.101.1 to any port 1433 comment "1433 rule added"

# allow access for subnet
sudo ufw allow from 15.15.15.0/24 to any port 873

# view numbered (easier to delete complicated rule)
sudo ufw status numbered

# delete
sudo ufw delete allow 80
sudo ufw delete 2

# insert rule in particular order (number 1 in this case, if number 1 exists it will become number 2)
sudo ufw insert 1 allow 22

# disable ipv6
sudo vim /etc/default/ufw
IPV6=no