Fix error can't connect internet when cloning Centos in Virtualbox

When working, I need some test with two Centos virtual machine/pc (6.4 minimal). 

So I installed one virtual machine and clone to another.

And to make two virtual machine can connect one Lan network (or one wifi network) with bridged adapter mode in Network settings, I need check to "Reinitialize the MAC address of all network cards) like behind image.

And when I started new virtual machine, I can't connect to internet.

Solution
 Need go to superuser with su command line

1. Remove the kernel’s networking interface rules file to reset
   
   # rm -f /etc/udev/rules.d/70-persistent-net.rules

2. Restart the VM

# reboot

3. UPDATE your interface configuration file
   
   # vi /etc/sysconfig/network-scripts/devices/ifcfg-eth0

4. Remove the MACADDR entry and the UUID entry
5. Save and exit the file (:wq)
6. Restart the networking service

# service network restart