Live ISO over http

[drewpy04]

Not sure if this is the appropriate place to post, but I have tried the google and not found any clear answers.

I would like to have a net boot environment for 25 workstations. I have a custom Debian Live CD that I have created (tested and it works - from USB boot too).

I have followed various guides, but am stuck at getting the Live CD to boot. I have configured ISC DHCP, tftp and apache to load the ISO into a memdisk. However once the kernel starts it throws an error saying that it is unable to find media with a filesystem on it.

I understand that once iPXE hands off to the Linux kernel that Linux is unable to locate the memdisk where the ISO was cached by iPXE.

Can anyone give some pointers as to what lines I would need in GRUB (?? if that's even the right place) to get this to boot?

Am I approaching this from the wrong angle? Should I be using NFS or iSCSI instead? I believe that having a memdisk would be better for my environment as there will be 25 workstations booting from the same image.

Thanks so much