Linux配置防火墙

 vi /etc/sysconfig/iptables

在打开的文件中（在配置22端口的下一行），添加  -A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT（允许3306端口通过防火墙）

###################################### 
# 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 3306 -j ACCEPT 
-A INPUT -j REJECT –reject-with icmp-host-prohibited 
-A FORWARD -j REJECT –reject-with icmp-host-prohibited 
COMMIT 
#####################################

  /etc/init.d/iptables restart       #最后重启防火墙使配置生效