EasyFirewall Implement a Basic Firewall Template with Iptables on Ubuntu RESOURCES https://oitibs.com/easy-ubuntu-16-server-firewall/ https://www.digitalocean.com/community/tutorials/how-to-implement-a-basic-firewall-template-with-iptables-on-ubuntu-14-04 http://jrs-s.net/2014/08/22/allowing-traceroutes-to-succeed-with-iptables/