Centos ntp scanner setup

sudo su
sudo yum install wget -y
wget http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm
sudo rpm -Uvh epel-release-7-5.noarch.rpm
yum install screen zmap gcc libcap  libpcap libpcap-devel screen php dstat cmake gmp gmp-devel gengetopt byacc flex git json-c -y
chmod +x NTPChecker

screen zmap -p 123 -M udp --probe-args=file:ntp_123_monlist.pkt -o monlist_fingerprint.txt -B 100M
./NTPChecker monlist_fingerprint.txt step1.txt 1 0 1

filter:
awk '$2>419{print $1}' step1.txt | sort -n | uniq | sort -R > ntp_amp.txt