Until you activate the license on the VM-Series firewall, the
firewall does not have a serial number, the MAC address of the dataplane
interfaces are not unique, and only a minimal number of sessions
are supported. Because the MAC addresses are not unique until the
firewall is licensed, to prevent issues caused by overlapping MAC addresses,
make sure that you do not have multiple, unlicensed VM-Series firewalls.
When you activate the license, the licensing server uses the
UUID and the CPU ID of the virtual machine to generate a unique
serial number for the VM-Series firewall. The capacity auth code
in conjunction with the serial number is used to validate your entitlement.