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dhcp vendor-option and grub net_pxe_extensionspath

From: Carl Karsten
Subject: dhcp vendor-option and grub net_pxe_extensionspath
Date: Fri, 28 Apr 2017 00:57:24 -0500

I am using dnsmasq, but I can bring up isc dhcp too.  I need help with both
sides, but on the grub list I won't be too picky about what dhcp server is

I am looking for the syntax of dhcp vendor options, and then how to access
them in grub-net.  I think.  maybe there is a better way.

I pxe boot grub, which boots di (Debian Installer) and pass a preseed file.

I am trying to work out a nice way to pass host specific info to di
example, most use:
but one machine has an onboard ssd nvme which needs /dev/nvme0n1

di will read values appended to the kernel boot line, so I can hard code it
like this:

menuentry "Install Ubuntu preseed" {
set gfxpayload=keep
linux /ubuntu-installer/amd64/linux gfxpayload=800x600x16,800x600 ---
auto=true url=dc10b hostname= partman-auto/disk="/dev/nvme0n1"
initrd /ubuntu-installer/amd64/initrd.gz

interface=${net_default_mac} - use the nic that pxe booted.

Now I get lost in conf options and syntax.  forgive me for making stuff up
here, if it worked I wouldn't be asking for help.

I am hoping for something like

in dnsmasq conf:


So yeah, how do I send random strings based on mac/hostname
and how do I read what was sent in grub?

Carl K

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