[활성화]
sudo ufw enable
[비활성화]
sudo ufw disable
[상태조회]
sudo ufw status verbose
[ssh 허용]
sudo ufw allow 22/tcp, sudo ufw allow 22/udp
[ssh 차단]
sudo ufw deny 22/tcp, sudo ufw deny 22/udp
[ssh 삭제]
sudo ufw delete deny ssh/tcp, sudo ufw delete deny ssh/udp
[IP 허용]
sudo ufw allow from 192.168.0.1
sudo ufw allow from 192.168.0.0/24
[IP, PORT 허용]
sudo ufw allow from 192.168.0.1 to any port 22
sudo ufw allow from 192.168.0.0/24 to any port 22