How to Change to Spoofed MAC Address Permanently in OpenBSD

To make the MAC address changed at boot before network connection is established, and even before parsing of hostname.* file, edit the /etc/netstart file to add in the following lines before the line of “# Now parse the hostname.* file”:
if [ "$if" = "INTERFACE" ]; then
ifconfig <interface> lladdr <MAC address in format of 00:00:00:00:00:00>
fi
# Now parse the hostname.* file
....