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$ sudo vim /etc/ssh/sshd_config
$ sudo vim /var/log/secure

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Port 65531    # ssh port to modify the default 22
ListenAddress 192.168.1.X    # ssh allows the IP address of the login
PermitRootLogin no    # root prohibited via ssh
AllowUsers test@192.168.1.*    # allows the user to test the IP 192.168.1. * Client Access Login

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Compression no
Compression delayed

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LoginGraceTime 6
MaxAuthTries 3
MaxSessions 6

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PrintLastLog yes

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ClientAliveInterval 900
ClientAliveCountMax 0

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$ sudo ls -l /etc/ssh/*key
$ sudo chmod 0600 /etc/ssh/*key
$ sudo grep -i hostkey /etc/ssh/sshd_config

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$ sudo ls -l /etc/ssh/*pub
$ sudo chmod 0644 /etc/ssh/*pub