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iptables -A INPUT -p tcp --dport 80 -s 192.168.0.1 -j ACCEPT

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iptables -A INPUT -p tcp --dport 22 -s 192.168.0.2 -j DROP

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sudo apt-get update
sudo apt-get install fail2ban

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sudo cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local

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sudo nano /etc/fail2ban/jail.local

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sudo systemctl start fail2ban
sudo systemctl enable fail2ban
sudo systemctl status fail2ban

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ssh-keygen -t rsa

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ssh-copy-id username@your_server_ip

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sudo nano /etc/ssh/sshd_config

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sudo systemctl restart sshd

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sudo apt-get update

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sudo apt-get upgrade

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sudo apt-get dist-upgrade

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rsync -avz /path/to/source username@remote_server:/path/to/destination

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