June 5, 20179 yr It is great to have firewalls blocking everything but lets say you want your VPN Server port open to everyone or optionally some other application. Port Knocking is yet another wonderful extra security layer, you can easily from a web browser window hit your server on port 10000,200,50 and it unlock your VPN Server Port for the ip address your on. Yes specific firewall rules are a great thing but lets face it some services you won't always know where your coming from, to have these applications closed off from access will prevent hacking services instead of allowing everyone access to the service. I noticed that a lot of docker adds to iptables, knockd can also be added easily to iptables. https://wiki.archlinux.org/index.php/Port_knocking
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