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Re:Port knocking by cheweh on Friday May 15, 2020 @09:11AM (#23191745)
From knockknock:

> When you want to open a port from a client, you run 'knockknock', which sends a single SYN packet to the server. The packet's IP and TCP headers are encoded to represent an IND-CCA secure encrypted request to open a specified port from the source IP address.

https://moxie.org/software/knockknock/

Re:Port knocking by cutemonster on Friday May 15, 2020 @01:52PM (#23195121)
That page links to a http insecure download script, weird. (Not https, no signature)

This link: wget http://www.thoughtcrime.org/software/knockknock/knockknock-0...

Re:Port knocking by Forbo on Friday May 15, 2020 @02:37PM (#23195696)
Yeah, the documentation is dated. Not only does it point to an old version, but it would probably be best to get it from the GitHub page he links to. Even then, there are more active forks, so they may be worth checking out to see which would be best to get on board with.
Re:Port knocking by cutemonster on Saturday May 16, 2020 @05:19AM (#23201851)
Thanks, seems this is the (also outdated) repo: https://github.com/moxie0/knockknock

Yes I suppose one of the forks is better nowadays