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sudo apt update
sudo apt upgrade
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sudo iptables -A INPUT -p tcp -s 192.168.1.100 –dport 22 -j ACCEPT
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sudo nano /etc/fail2ban/jail.local
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[ssh]
enabled = true
port = ssh
filter = sshd
logpath = /var/log/auth.log
maxretry = 3
bantime = 3600
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sudo service fail2ban restart
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sudo nano /etc/resolv.conf
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AllowUsers user1 user2
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PasswordAuthentication no
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LoginGraceTime 60
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PermitEmptyPasswords no
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sudo service ssh restart
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sudo apt install libpam-passwdqc
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sudo nano /etc/pam.d/common-password
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