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I have a PXE server setup for network booting systems via grub. Unfortunately, I don't have control over the entire network's DHCP servers, so I can't network boot all systems. I'd like to create a bootable USB thumb drive that can be pointed to the ip/server name of the TFTP server to load grub from it and work entirely over the network from that point on just like the network boot systems.

How do I do this?

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I've never done it but according to this you could build a version of GRUB (with support for your network card) that has TFTP support.

It looks like you can either create a config file that tells GRUB to TFTP from a specific IP address (without having to do DHCP first) or type those commands in manually at the GRUB command prompt.

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What I'm after is getting the entire menu and bootloader from the tftp server, so I think the process I actually need is to chainload pxelinux (pulled down through tftp) from syslinux (found on the USB drive). Your option seems to be to just download a single kernel. –  Jared Jul 26 '13 at 16:02
    
Well you could TFTP whatever you want, whether it's another bootloader or whatever. I didn't know syslinux could tftp in a bootloader though. –  ultrasawblade Jul 26 '13 at 17:48

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