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First step, install OpenSSH. On Ubuntu you can use "sudo apt install openssh-server"
Edit file “/etc/hosts.allow” and allow only specific IPs or network to access over ssh.
# Example (network 192.168.0.0/24)
sshd: 192.168.0.Block all another IPs editing “/etc/hosts.deny” with:
sshd: ALLEdit file “/etc/ssh/sshd_config” and include this role: “PermitRootLogin no”
Install UFW firewall, allow SSH connections and enable firewall:
sudo apt install ufw
sudo ufw allow ssh
sudo ufw enable
