How to safely connect from anywhere to your closed Linux firewall | MDLog:/sysadmin

How to safely connect from anywhere to your closed Linux firewall | MDLog:/sysadmin: “In general all the great ideas are the simple ones. Many times we see a great idea in practice and we wander why didn’t we thought of that before? It is just so simple… The first time I have seen the knockd project I liked it instantly. The idea is so simple, and though so effective. Knockd is a port-knocking application that silently runs on a server passively listening to network traffic. Once it will see a port sequence it has an action configured for it, it will run that action. We can see this as a remote control to our server: once we hit the right button it will take the appropriate action!”