knock

v 0.7.8-20151227

A port-knocking implementation

knockd is a port-knock server. It listens to all traffic on an ethernet (or PPP) interface, looking for special knock sequences of port-hits. A client makes these port-hits by sending a TCP (or UDP) packet to a port on the server. This port need not be open -- since knockd listens at the link-layer level, it sees all traffic even if it's destined for a closed port. When the server detects a specific sequence of port-hits, it runs a command defined in its configuration file. This can be used to open up holes in a firewall for quick access.

https://www.zeroflux.org/projects/knock

To install knock, paste this in macOS terminal after installing MacPorts

sudo port install knock

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