Linux 开启或关闭防火墙

centOS:

开启

# service iptables start
# chkconfig iptables on 设置开机启动

关闭
# service iptables stop
# chkconfig iptables off  禁止开机启动

查看防火墙状态
# service iptables status

ubuntu:
# ufw disable
# ufw enable