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knock on Scientific Linux 6.1? (perl script for knocking?)

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http://unix.stackexchange.com – I have an OpenWrt router where I installed knockd: knockd.conf [options] logfile = /var/log/knockd.log [openSSH] sequence = 7000,8000,9000 seq_timeout = 5 command = /usr/sbin/iptables -I INPUT -s %IP% -p tcp --dport 22 -j ACCEPT tcpflags = syn [closeSSH] sequence = 9000,8000,7000 seq_timeout = 5 command = /usr/sbin/iptables -D INPUT -s %IP% -p tcp --dport 22 -j ACCEPT tcpflags = syn and I'm having a notebook with Scientific Linux 6.1 from where I want to knock.. but seems there isn't any "knock" package for SL 6.1.. Where can I ge (HowTos)