(You can find a lot of articles on this from the internet. I just put it here for my own record.)

It's because the cloned system has the original mac address in the Linux configuration files.

1. rm -f /etc/udev/rules.d/70-persistent-net.rules

2. vi /etc/sysconfig/networking/devices/ifcfg-eth0

Remove the MACADDR and UUID lines.

3. reboot

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