There are 3 repositories under port-knocker topic.
A web client port-scanner written in GO, that supports the WASM/WASI interface for Browser WebAssembly runtime execution.
Layer 4 Single Packet Authentication Linux kernel module utilizing Netfilter hooks and kernel supported Berkeley Packet Filters (BPF)
Not your average port knocker. A web-based service written in pure PHP that opens protected TCP and UDP ports in response to encrypted requests from a correctly configured client for a limited but renewable time period. MIT or LGPL.
Port-knocking client with multiple hosts support
A port knocking code, written in python3
Enable/Disable ports on windows using sequences of SYN packets sent to defined ports
A port knocking program that works off of periodically changing sequences.
Bash script for knocking on TCP and UDP ports. No dependencies.
Simple scripts for generating one time sequences for knockd and for knocking a host with either netcat or nmap
Improving SSH security by changing Port#, Changing IP Table Rules, Allowing only certain Port numbers, Installing Port Knocking