[options]
       logfile = /var/log/knockd.log

[openSSH]
       sequence    = 7000,8000,9000
       seq_timeout = 5
       command     = /sbin/iptables -A INPUT -s %IP% -p tcp --dport 22 -j ACCEPT
       tcpflags    = syn

[closeSSH]
       sequence    = 9000,8000,7000
       seq_timeout = 5
       command     = /sbin/iptables -D INPUT -s %IP% -p tcp --dport 22 -j ACCEPT
       tcpflags    = syn

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