UEFI PXE Boot Policy
Use this option to set the order of network boot
targets in the UEFI Boot Order list. When set
to Auto, new network boot targets are added to the end of the list
according to the default policy of the system ROM.
NOTE:
When both IPv4 and IPv6 are enabled, each network boot target appears twice in the UEFI Boot Order list (one for IPv4 and the other for IPv6).