Recently I got a tip about subsequent adding of port forwardings to SSH Sessions without logout/login. As I work a lot with cloud technology and therefore use openssh very frequently, I found this very handy and use it several times a day.
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I have a small home server setup which has its port forwarded to the internet router. Recently I inspected my sshd logfiles and found a way too much brute force attacks against my ssh daemon. I searched for a solution to protect against that and stumbled upon knockd.
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Hi,

next time you wanna test a firewall rule and there is no service running on the destination port jet…
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