Linux SSH server allow single IP connection

[serveroffer]

Open SSH server settings:

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nano /etc/ssh/sshd_config

add line to the end of file:

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AllowUsers *@REMOTE_IP

REMOTE_IP - is the IP address you want to allow connection from.

Allow range
To allow IP range instead of single IP, add line:

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AllowUsers *@10.10.10.*

It does allow any IP from range 10.10.10.1-255 to connect

CTRL+x - exit from nano and save settings to the file.
service ssh restart - restart SSHD server