service iptables status
yum install -y iptables
yum update iptables
yum install iptables-services
systemctl enable iptables.service
systemctl start iptables.service
systemctl status iptables.service
centos7 自带 firewalld
#停止firewalld服务
systemctl stop firewalld
#禁用firewalld服务
systemctl mask firewalld
service iptables start
service iptables stop
service iptables restart
service iptables status
chkconfig iptables off
chkconfig iptables on
serivce iptables save
iptables -L -n
iptables -P INPUT ACCEPT
iptables -F
iptables -X
iptables -Z
iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
iptables -A INPUT -p tcp --dport 21 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j ACCEPT
iptables -A INPUT -p icmp --icmp-type 8 -j ACCEPT
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -P INPUT DROP
iptables -P OUTPUT ACCEPT
iptables -P FORWARD DROP
iptables -A INPUT -p tcp -s 45.96.174.68 -j ACCEPT
iptables -P INPUT DROP
iptables -I INPUT -s ***.***.***.*** -j DROP
iptables -D INPUT -s ***.***.***.*** -j DROP