Henry's Points

Due to my desktop will go to public, I mean public IP not NASDQ, I have to enable firewall. After googling, I find a default firewall for Ubuntu system – Uncomplicated Firewall (UFW).

Enable/Disable Firewall

sudo ufw enable
sudo ufw disable

Add rules to firewall

sudo ufw allow 22
sudo ufw delete allow 22
sudo ufw deny from 10.1.1.1/24 to any port 22
sudo ufw allow from 10.2.2.2/24 to any port 22

To see current rules

sudo ufw status verbose

For all port mapping, you can go to cat /etc/service.

Thanks

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