1. Linux系统：Red Hat Enterprise Linux Server release 6.5 (Santiago)
临时关闭防火墙命令：
service iptables stop
service ip6tables stop
永久关闭防火墙命令：
chkconfig iptables off
chkconfig ip6tables off
查看防火墙状态命令：
service iptables status
[root@hadoop ~]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release6.5(Santiago)
[root@hadoop~]# service iptables stop
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Flushing firewall rules: [ OK ]
iptables: Unloading modules: [ OK ]
[root@hadoop~]# service ip6tables stop
ip6tables: Setting chains to policy ACCEPT: filter [ OK ]
ip6tables: Flushing firewall rules: [ OK ]
ip6tables: Unloading modules: [ OK ]
[root@hadoop~]# service iptables status
iptables: Firewallisnot running.