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/etc/knockd.conf on Raspberry Pi, refer to https://linux.die.net/man/1/knockd
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| [options] | |
| UseSyslog | |
| [opencloseSSH] | |
| sequence = 7000,8000,9000 | |
| seq_timeout = 5 | |
| tcpflags = syn | |
| start_command = /usr/bin/firewall-cmd --zone=public --add-service=ssh | |
| cmd_timeout = 10 | |
| stop_command = /usr/bin/firewall-cmd --zone=public --remove-service=ssh |
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