CentOS 7

replace Firewalld to iptables

 systemctl mask firewalld
 systemctl stop firewalld
 yum install iptables-services
 systemctl enable iptables
 systemctl start iptables

install some tools

yum install net-tools telnet yum-utils

iptables （參考

CentOS 7 install iptables

yum install iptables system-config-firewall-tui setuptool





 iptables -I INPUT -i eth1   0.0.0.0/0 -j ACCEPT

## Block something

iptabels -I INPUT -i eth0 -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -j DROP
iptabels -I INPUT -i eth0 -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,SYN,RST,PSH,ACK,URG -j DROP
iptabels -I INPUT -i eth0 -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,SYN,RST,ACK,URG -j DROP
iptabels -I INPUT -i eth0 -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -j DROP
iptabels -I INPUT -i eth0 -p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -j DROP
iptabels -I INPUT -i eth0 -p tcp -m tcp --tcp-flags SYN,RST SYN,RST -j DROP
iptabels -I INPUT -i eth0 -p tcp -m tcp --tcp-flags FIN,RST FIN,RST -j DROP
iptabels -I INPUT -i eth0 -p tcp -m tcp --tcp-flags FIN,ACK FIN -j DROP
iptabels -I INPUT -i eth0 -p tcp -m tcp --tcp-flags PSH,ACK PSH -j DROP
iptabels -I INPUT -i eth0 -p tcp -m tcp --tcp-flags ACK,URG URG -j DROP