/sbin/iptables -I INPUT -p tcp --dport 8000 -j ACCEPT /sbin/iptables -I INPUT -p tcp --dport 22 -j ACCEPT
在开启了防火墙时，做如下设置，开启相关端口，
修改/etc/sysconfig/iptables 文件，添加以下内容：
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT ---------------------------------------- -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 1556 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 13724 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 13782 -j ACCEPT
Linux配置防火墙，开启80端口、3306端口
vi /etc/sysconfig/iptables -A INPUT -m state –state NEW -m tcp -p tcp –dport 80 -j ACCEPT（允许80端口通过防火墙） -A INPUT -m state –state NEW -m tcp -p tcp –dport 3306 -j ACCEPT（允许3306端口通过防火墙）
特别提示：很多网友把这两条规则添加到防火墙配置的最后一行，导致防火墙启动失败，正确的应该是添加到默认的22端口这条规则的下面
添加好之后防火墙规则如下所示：
###################################### # 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 -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 ##################################### #最后重启防火墙使配置生效 /etc/init.d/iptables restart
#定义白名单变量名
-N whitelist
#设置白名单ip段
-A whitelist -s 120.25.122.0 -j ACCEPT -A whitelist -s 120.25.122.1 -j ACCEPT -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p icmp -j whitelist -A INPUT -i lo -j ACCEPT
#开放http/https端口外界访问
-A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 8443 -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT
#系统远程连接及数据库端口规定白名单ip才可访问
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j whitelist -A INPUT -p tcp -m state --state NEW -m tcp --dport 1521 -j whitelist -A INPUT -p tcp -m state --state NEW -m tcp --dport 8080 -j whitelist -A INPUT -p tcp -m state --state NEW -m tcp --dport 3306 -j whitelist -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT -A INPUT -p tcp -m state --state NEW -m tcp --dport 19400 -j ACCEPT
