Suggest an alternative to

knockknock

A simple, secure, and stealthy port knocking implementation that does not use libpcap or bind to a socket interface.

Why do you think that https://github.com/CERN-CERT/pam_2fa is a good alternative to knockknock

A URL to the alternative repo (e.g. GitHub, GitLab)

Here you can share your experience with the project you are suggesting or its comparison with knockknock. Optional.

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