Centos6-防火墙的基本配置

1.iptables

启动指令: service iptables start

重启指令: service iptables restart

关闭指令: service iptables stop

保存指令: service iptables save

相关配置: /etc/sysconfig/iptables

2.操作: vim /etc/sysconfig/iptables

# Firewall configuration written by system-config-firewall

# Manual customization of this file is 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

启动: service iptables start

重启: service iptables restart

保存: service iptables save

注意: 先service iptables restart，然后才调用/etc/rc.d/init.d/iptables save

因为/etc/rc.d/init.d/iptables save会在iptables服务启动时重新加载，

要是在重启之前直接先调用了/etc/rc.d/init.d/iptables save

那么你的/etc/sysconfig/iptables 配置就回滚到上次启动服务的配置了，这点必须注意！！！