URL:
<https://savannah.gnu.org/bugs/?55636>
Summary: Wrong TFTP server when booted from proxyDHCP
Project: GNU GRUB
Submitted by: alkisg
Submitted on: Sun 03 Feb 2019 03:46:33 PM UTC
Category: Booting
Severity: Major
Priority: 5 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release:
Release: 2.02
Reproducibility: Every Time
Planned Release: None
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Details:
When grub is booted from a proxyDHCP server, it tries to download grub.cfg
from the real DHCP server, and fails.
In the rescue shell, I see that $net_efinet0_dhcp_server_name has the correct
proxyDHCP=TFTP server IP, but grub is using $net_default_server instead, which
has the real DHCP server IP, which is not a TFTP server.
Years ago, this patch was proposed:
[Re: RFC Patch [0/2] PXE Add support for proxy
DHCP](https://lists.gnu.org/archive/html/grub-devel/2014-04/msg00091.html)
As a reply, an even better patch was proposed. Yet none have been merged in
git so far.
ProxyDHCP netbooting is used in thousands of installations, and grub
supporting it is especially useful nowadays, as shimx64.efi > grubnetx64.efi
is pretty much the only option for netbooting with UEFI secure boot enabled.
This was the respective commit in shim, which added proxyDHCP support:
https://github.com/rhboot/shim/commit/5f4fd5364109c80934b7837255ddde61f572fd69
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