방화벽 켜기 : sudo ufw enable
방화벽 끄기 : sudo ufw disable
특정 포트/프로토콜 허용 : sudo ufw allow(포트)/(프로토콜)
특정포트/프로토콜 차단 : sudo ufw deny(포트)/(프로토콜)
규칙 삭제 : sudo ufw delete (allow/deny) (포트)/(프로토콜)
IP차단 : sudo ufw deny from IP
ufw 상태: sudo ufw status
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