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    = synand 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 get the RPM for the knock binary? (Or are there any alternatives for knock? A perl script maybe?)
knock on Scientific Linux 6.1? (perl script for knocking?)
security;perl;scientific linux
This can be done with either bash's /dev/tcp/host/port or netcat.