Requirments: python 2 or 3 Must be on linux fedora / centos / debian based systems. pip install scapy pip install Make sure iptables is up and runing This software only for checking the port knocking server. apt-get install knockd or for redhat / centos / fedora yum install knocked or rpm -ivh https://rpmfind.net/linux/opensuse/tumbleweed/repo/oss/x86_64/knockd-0.7-2.8.x86_64.rpm for mac https://apps.apple.com/us/app/knock-unlock-your-mac-without-password-using-your-iphone/id692929970
Commands to preform: iptables -I INPUT -p tcp -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -I INPUT -p icmp -j ACCEPT iptables –A INPUT –j REJECT knock –v server_ip 2222 3333 4444 ;ssh server_ip