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GRUB PXE not requesting formatted configs automatically

From: Robert LeBlanc
Subject: GRUB PXE not requesting formatted configs automatically
Date: Fri, 25 Feb 2022 16:31:02 -0700

I've been struggling with getting GRUB PXE to request the automatic list of config files, but nothing is working (I'm sniffing the network traffic). I can get GRUB to load the config just fine if I specify
configfile (tftp,$net_pxe_mac
in an embedded config file. I'm using proxyDHCP so I have to embed the target here instead of leveraging $net_default_server or $net_pxe_next_server which have the DHCP server listed.

After grub loads the modules from TFTP, it immediately jumps to loading `/boot/grub/grub.cfg` and not the list specified in the documentation [1] as 
According to a comment in `main.c`, it appears that it only tries this code path when entering normal mode from rescue mode. I've tried typing `normal` from the GRUB command line without any luck. I've set `debug=all` and I don't get any messages from `net.c` and only `disk.c` saying that `Opening 'tftp,' failed`.

I'm at a loss here and hope someone can shed some light since my searching is turning up empty.

Thank you,
Robert LeBlanc

Robert LeBlanc
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