vi /etc/sysconfig/iptables

# sample configuration for iptables service
# you can edit this manually or use system-config-firewall
# please do not ask us to add additional ports/services to this default configuration
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]

-N whitelist
-A whitelist -s xx.xx.xx.xx/32 -j ACCEPT　　　　##添加IP到白名单

-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j whitelist　　　　##whitelist调用白名单IP列表，22端口只允许白名单IP使用
-A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT　　　　　　##无调用白名单，外网可访问
-A INPUT -p tcp -m state --state NEW -m tcp --dport 443 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
~