Security: Port Knocking (Centos 7)

Server : CentOS 7
use knockd
down : http://li.nux.ro/download/nux/misc/el7/x86_64/knock-server-0.7-1.el7.nux.x86_64.rpm

Client:Kali Linux
use knock – apt-get install knockd

Config:
Sever:
yum install libcap*
wget http://li.nux.ro/download/nux/misc/el7/x86_64/knock-server-0.7-1.el7.nux.x86_64.rpm
rpm -ivh knock-server-0.7-1.el7.nux.x86_64.rpm
config vi /etc/knockd.conf
iptables -I INPUT -p tcp –dport 22 -j REJECT

Client:
Knock -v server -knock1 knock2 knock3- #knock*knock*knock*# !

source

centos 7