General Help Network Settings NAT - Network Address Translation https://www.karlrupp.net/en/computer/nat_tutorial How To List and Delete Iptables Firewall Rules https://www.digitalocean.com/community/tutorials/how-to-list-and-delete-iptables-firewall-rules Iptables Essentials: Common Firewall Rules and Commands https://www.digitalocean.com/community/tutorials/iptables-essentials-common-firewall-rules-and-commands#saving-rules