对于普通Linux机器开关防火墙命令：
1重启后生效
chkconfig iptables off
chkconfig iptables on
2即时生效
serivce iptables status
service iptables start
service iptables stop
对于AIX机器开关防火墙步骤：
命令：smit
输入之后按照图形化操作
Communications Applications And Services——>TCP/IP——>Configure IP Security(IPV4)——>Start/Stop IP Security