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apt-get install ufw
ufw status
ufw version
ufw enable
ufw disable
ufw default deny
ufw allow 22/tcp
ufw allow 53
ufw deny 3306
ufw delete allow 22
ufw allow from 192.168.1.100
ufw delete allow from 192.168.1.100
ufw deny 8888
ufw allow proto tcp from 192.168.0.1 to any port 22
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