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iptables allow creation of rules to define packet filtering behavior.

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You can do the following things, Using IPTABLES block all incoming subnet/IP addresses for port 22 except the allowed one's Set Idle time disconnects Deny direct root login from putty by editing sshd conf file monitor failed login on /var/log/secure logs and take remediate actions …
answered Jun 13 by Prithvirajan Balakrishnan