[bug #65250] GRUB unable to PXE boot

[Qiumiao Zhang]

URL:
  <https://savannah.gnu.org/bugs/?65250>

                 Summary: GRUB unable to PXE boot 
                   Group: GNU GRUB
               Submitter: century6
               Submitted: Sun 04 Feb 2024 07:01:23 AM UTC
                Category: Network
                Severity: Major
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: century6
        Originator Email: 
             Open/Closed: Open
                 Release: Git master
                 Release: 
         Discussion Lock: Any
         Reproducibility: Every Time
         Planned Release: None


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Follow-up Comments:


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Date: Sun 04 Feb 2024 07:01:23 AM UTC By: Qiumiao Zhang <century6>
Versions affected: 2.04, 2.06
Reproduced on: UEFI PXE with DHCPv6 Relay Agent
Tested on: QEMU virtual machine (x86_64) with Linux

A DHCPv6 relay agent, which may reside on the client's link, is used to relay
messages between the client and the server. It allows a DHCPv6 client to send
a message to a DHCPv6 server that is not connected to the same link.

In the PXE scenario, if the client and server are not connected to the same
link,  grub2 needs to configure the default gateway after requesting an IP
address from the server through a DHCPv6 relay agent, otherwise grub2 does not
know which network interface to use to send tftp requests.

I think grub2 needs to send an ICMPv6 (type 133) Router Solicitation (RS)
message to inquire about the local IPv6-capable router on the network. In
response to the RS, the router immediately sends an ICMPv6 (type 134) Routing
Advertisement (RA) message, then grub2 can configure the default gateway
through the RA message. And perhaps this process should be done in the
function of grub_efi_net_config_real(). Is this feasible?









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