[CentOS] 6.4. When OS does not recognize NIC

# Tried on CentOS 6.4 on VMWare

# When the OS doesn't recognize NIC, even NIC installed already.

vi /etc/sysconfig/network-scripts/ifcfg-eth0

chagne the value of ONBOOT to yes.

ONBOOT=yes

then

/etc/init.d/network restart