installed CentOS 6.4 from a “minimal” ISO.
安装后ping测试
connect: Network is unreachable.
网络服务不可用

vi to edit /etc/sysconfig/network-scripts/ifcfg-eth0, 
#注释掉2行 
#NM_CONTROLLED=yes
#ONBOOT=n

保存，之后重启网络服务
/etc/init.d/network restart