I'm creating vagrant box's with packer. The process goes smoothly without error.

After the box is imported and a vagrant up is called, the resulting image has a different interface name.

The name is of the following format (as is the one in packer packer, just a different name): eno16777728

CentOS 7 uses persistent udev naming rules. The above naming format indicates it's using the bios device index. For the name to change, the bios index would need to change.

I assume this is a result of a change in the vmx file resulting in a change in device enumeration by the bios.