Portknocking a SSH

Posted on February 18, 2017, 11:37 pm, by tomas, under security.
${IPTABLES} -A INPUT -p tcp --dport 7777 -m recent --set --name portknock
${IPTABLES} -A INPUT -p tcp --syn --dport 22 -m recent --rcheck --seconds 60 --name portknock -j ACCEPT
${IPTABLES} -A INPUT -p tcp --syn --dport 22 -j DENY
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