It is possible to PXE boot over the internet using iPXE. Here is how to add this useful tool to your grub4dos multiboot pen.
1. Download the ipxe.iso from here and save it directly to your grub4dos USB boot drive (e.g. /ISO folder).
2. Add the menu option below to your menu.lst file:
You can use iPXE to boot iSCSI, AoE, TFTP, VLAN and via other protocols too, but here is how to test the HTTP bit.
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To test it, you can use RMPrepUSB and test it using QEMU straight away (it seems to work with NAT!). Press F11 in RMPrepUSB to boot from the USB drive and then select the grub4dos ipxe menu you have just added.
When you see the 'Press Ctrl-B' prompt (first one or 2nd one), press CTRL-B quickly to stop it trying to boot from another source.
You have now successfully booted to linux over the internet!
Now try it by booting on a real system using exactly the same two commands. You will need an ethernet connection and a router.
iPXE does have some WiFi support too!. Unplug the Ethernet cable and try it on a netbook or notebook using the following commands after you hit Ctrl-B:
help will list available commands or there is a command reference here.
If you want to try booting a whole set of different OS's across the internet, try netboot.me at http://www.netboot.me/. Download the netbootme.iso file and add it to your grub4dos menu:
Fully automated, no typing required, just boots straights to the menu shown below, works in QEMU too (press F11 in RMPrepUSB to test your USB drive).
netboot.me has no WiFi wireless support (no iwstat or iwlist commands) so you need an Ethernet cable.
BSD - FreeBSD (various) and MirOS bsd4me
Linux - CentOS 5, Debian Lenny 5, Fedora, OpenSUSE 11.1, Ubuntu Jaunty, Karmic 9.10, Lucid
BSD, Linux, Tiny Core Linux 2.2, Micro Core, Slitaz cooking&Stable, MirOS
Memtest86+,Memtest86,Hardware Diagnostic Tool 0.3.4, Gparted Live0.4.5-2, Parted Magic 4.5, Centos 5 Rescue Mode, Karmic x86 Rescue, Smart Boot Manager
Why not create your own version. You can do this by following the instructions here and then try booting it.
See also http://boot.kernel.org/ (site has had problems and may not have iPXE/gPXE downloads yet) and the mirror site http://boot.rit.edu/index.html. (does have gpxe.iso).
Typical menu options:
Debian : Debian live
Ubuntu : 9.04
Damm Small Linux : Lightweight linux distribution with GUI.
Knoppix : Knoppix 5.0.1 English.
Fedora 11 Live CD : Currently only single user mode is working. (Working on complete live CD)
Hard disk utilities
There is also a HowTo article here.