Boot an Ubuntu ISO via iPXE

[obie]

Thanks for the responses - NiKiZe and MutlimediaMan. I have managed to get your suggestions to work. I'm using the netboot kernel and initrd images provided by ubuntu mirrors and using my own preseed. One question I have is and this may be specific to the Ubuntu kernel arguments: Is there anyway to get the OS to load just in memory? I've tried using:

kernel https://link_to_kernel boot=casper toram url=https://preseed_url

but that doesn't seem to work. Basically at the end of the day, I want this machine to always PXE boot on restart so it installs a new OS. Loading the OS in memory seems like the easiest way to wipeout the OS on restart. Thanks again.