Install Repo

cd /etc/yum.repos.d/
wget http://packages.ntop.org/centos-stable/ntop.repo -O ntop.repo

Install Epel

rpm -ivh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

Install NTOP-NG

yum erase zeromq3
yum clean all
yum update
yum install pfring n2disk nprobe ntopng ntopng-data cento
yum install pfring-drivers-zc-dkms

Open Firewall

firewall-cmd --zone=public --add-port=3000/tcp --permanent
firewall-cmd --reload