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I much prefer the approach I read about in https://github.com/moxie0/knockknock https://github.com/moxie0/knockknock (use a safe language, trust basically only

I much prefer the approach I read about in https://github.com/moxie0/knockknock https://github.com/moxie0/knockknock (use a safe language, trust basically only the program you write and the language), to a random port daemon written in C which pulls libpcap to sniff everything. To some extent knockknock also trusts the Python interpreter which is not ideal (but maybe OK)

Aloisius 3y ago
In Linux, simple knocking (fixed sequences of ports) can be done entirely in the kernel with nftables rules. Probably could even have different knock ports based on day of the week or hour or source IP. https://wiki.nftables.org/wiki-nftables/index.php/Port_knocking_example https://wiki.nftables.org/wiki-nftables/index.php/Port_knock...