Passing dhcpd options to kernel command line

[MultimediaMan]

iPXE DHCP variables:

next-server = DHCP Option 66 = iPXE variable ${66}
host-name = DHCP Option 12 = iPXE variable ${12}
ipxe.username = DHCP Option 190 = iPXE variable ${190}

Note: These variables tend to be GLOBAL and are overwritten each time a DHCP request is sent from the iPXE DHCP client.

I've been using these variables for over a decade: they work.