knock/knockd.conf

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[options]
UseSyslog
[opencloseSSH]
sequence = 2222:udp,3333:tcp,4444:udp
seq_timeout = 15
tcpflags = syn,ack
start_command = iptables -I INPUT 1 -s %IP% -p tcp --dport ssh -j ACCEPT
cmd_timeout = 10
stop_command = iptables -D INPUT -s %IP% -p tcp --dport ssh -j ACCEPT