I had a VMware VM of a RHEL6.4 64-bit  machine, security hardened to CIS standards, converted to VM template within vSphere as it was going to be reused, I then used ‘Clone to New Virtual Machine’ to…well..erm..clone it, this worked fine, however on booting the new VM networking was messed up, even though all the configs seem to be in place in for eth0 in /etc/sysconfig/network-scripts/ifcfg-eth0. I tried removing the UUID, and HW address for this device, adding removing the VNIC in vSphere, all to noavail

The fix was this.

Boot the VM, got to /etc/udev/rules.d/70-persistent-net.rules, delete everything in that file pertaining to interfaces, save, close and reboot and you are good.