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iptables -A INPUT -s 192.168.0.2 -j DROP

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iptables -A INPUT -p tcp --dport 22 -j ACCEPT

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iptables -A INPUT -p tcp --dport 23 -j DROP

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sudo vi /etc/fail2ban/jail.conf

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enabled = true
port = ssh
filter = sshd
logpath = /var/log/auth.log
maxretry = 3

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sudo systemctl start fail2ban

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