Check status
sudo ufw status
# or
sudo ufw status verbose
# or
sudo ufw status numbered
Delete value based on number:
sudo ufw delete 5
Allow port
sudo ufw allow 22/tcp
Deny port
sudo ufw deny 80/tcp
Allow from ip address or subnet
sudo ufw allow from 10.22.96.0/20
Allow from ip address to specific port
sudo ufw allow from 10.22.96.0/20 proto tcp to any port 5432
Disable ufw
sudo ufw disable
Block an ip address or subnet
sudo ufw deny from 203.0.113.100
Delete a rule
sudo ufw delete allow from 203.0.113.101
Allow incoming connection to a network interface
sudo ufw allow in on eth0 from 203.0.113.102