linux下防火墙配置：
touch /etc/sysconfig/iptables
拷贝如下内容至上面新建文件。
# Firewall configuration written by system-config-securitylevel
# Manual customization of this file is not recommended.
*filter
:FORWARD ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:RH-Firewall-1-INPUT - [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -j RH-Firewall-1-INPUT
-A FORWARD -j RH-Firewall-1-INPUT
-A RH-Firewall-1-INPUT -i lo -j ACCEPT
-A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
-A RH-Firewall-1-INPUT -p 50 -j ACCEPT
-A RH-Firewall-1-INPUT -p 51 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
#-A RH-Firewall-1-INPUT -p tcp -m state -m tcp --dport 22 --state NEW -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state -m tcp --dport 62222 --state NEW -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state -m tcp --dport 1521 --state NEW -j ACCEPT
#-A RH-Firewall-1-INPUT -p tcp -m state -m tcp --dport 1158 --state NEW -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state -m tcp --dport 5901 --state NEW -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m state -m udp --dport 123 --state NEW -j ACCEPT
#-A RH-Firewall-1-INPUT -p tcp -m state -m tcp --dport 8080 --state NEW -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state -m tcp --dport 10240:10260 --state NEW -j ACCEPT
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
COMMIT