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SSH£¨Secure Shell£©

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sudo apt-get install openssh-server

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sudo nano /etc/ssh/sshd_config

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#Port 22
#PermitRootLogin prohibit-password

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sudo service ssh restart

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Fail2Ban

Fail2BanÊÇÒ»¸öÓÃÓÚ±ÜÃⱩÁ¦Æƽ⹥»÷µÄ¿ªÔ´Èí¼þ £¬Ëü¿ÉÒÔ¼ì²âµ½¶à´Îʧ°ÜµÄµÇ¼ʵÑé £¬²¢ÇÒ×Ô¶¯·â½û¹¥»÷ÕßµÄIPµØµã¡£ÕâÀïÎÒÃǸø³öÒ»¸öʾÀý £¬ÓÃÓÚ¼à¿ØSSHµÇ¼ʧ°ÜµÄÇéÐΡ£

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sudo apt-get install fail2ban

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sudo nano /etc/fail2ban/jail.local

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[sshd]
enabled = true
port = ssh
logpath = %(sshd_log)s
findtime = 600
bantime = 3600
maxretry = 3

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sudo service fail2ban restart

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iptables

iptablesÊÇÒ»¸öÔÚLinuxÄÚºËÖеķÀ»ðǽ¹¤¾ß £¬¿ÉÒÔ¹ýÂ˺Íת·¢ÍøÂçÊý¾Ý°ü £¬ÓÃÓÚ¿ØÖÆÍøÂç»á¼û¹æÔò¡£ÒÔÏÂÊÇһЩ³£¼ûµÄiptablesÏÂÁîʾÀý¡£

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sudo iptables -P INPUT DROP

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sudo iptables -A INPUT -s <IPµØµã> -j ACCEPT

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sudo iptables -A INPUT -p tcp --dport <¶Ë¿ÚºÅ> -j ACCEPT

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sudo iptables -A INPUT -s <IPµØµã> -j DROP

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sudo service iptables save

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