CentOS 7.0 Enable Iptables firewall

The author in order to configure the firewall, look for iptables service must not, until a moment! Only found that I use centos7 , and this version of the firewall, the default is to use the firewall, and the previous version of the use of iptables is not the same, this is important!

So if you want to configure the firewall, open the port, you can use the following practices:

1. Close firewall:

Systemctl Stop Firewalld.service #停止firewall

Systemctl Disable Firewalld.service #禁止firewall开机启动

2. Install iptables Firewall

Yum Install iptables-services #安装

The next thing is the same as using iptables, to open a port, (80 port For example, red for the added rule):

Vi/etc/sysconfig/iptables

-A input-m state--state new-m tcp-p TCP--dport 80-j ACCEPT #允许80端口通过防火墙

############################## After you add the firewall rule as follows ##############################
# Firewall configuration written by System-config-firewall
# Manual Customization of this file are not recommended.
*filter
: INPUT ACCEPT [0:0]
: FORWARD ACCEPT [0:0]
: OUTPUT ACCEPT [0:0]
-A input-m state--state established,related-j ACCEPT
-A input-p icmp-j ACCEPT
-A input-i lo-j ACCEPT
-A input-m state--state new-m tcp-p TCP--dport 22-j ACCEPT
-A input-m state--state new-m tcp-p TCP--dport 80-j ACCEPT
-A input-j REJECT--reject-with icmp-host-prohibited
-A forward-j REJECT--reject-with icmp-host-prohibited
COMMIT
#######################################################################################

CentOS 7.0 Enable Iptables firewall