centos6.5添加白名单如下：

在防火墙 配置文件中加入白名单 ip

-A INPUT -s 183.136.133.0/24 -j ACCEPT //保存重启iptables服务，则只有该段可以访问

批量添加 参考：http://www.ithov.com/linux/135727.shtml

查看iptables规则是否生效

[root@ithov ~]# iptables -nL

# 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 -p tcp --dport 80 -j ACCEPT
-A INPUT -p tcp --dport 8080 -j ACCEPT
-A INPUT -p tcp --dport 8091 -j ACCEPT
-A INPUT -p tcp --dport 3306 -j ACCEPT
-A INPUT -s 121.199.130.108 -p tcp --dport 15000 -j ACCEPT   //只允许该公网ip访问该端口
-A INPUT -s 10.0.0.0/8 -p tcp --dport 15000 -j ACCEPT     //允许该网段访问该端口
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT