[Bug 1604496] Re: TFTP boot: error: time out opening '/grub/i386-pc/normal.mod'

[tripod31]

Recently I had same problem.Version of grub is 2.02~beta2-22+deb8u1.I'm using debian,not ubuntu,sorry.After googled about it and found this,
https://serverfault.com/questions/818600/pxe-boot-with-grub-root-variable-unset
Remaking core.0 solved the problem.

$grub-mkimage -O i386-pc-pxe --output core.0 --prefix='(tftp,192.168.3.101)/boot/grub' pxe tftp
'192.168.3.101' is IP address of tftp server.

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https://bugs.launchpad.net/bugs/1604496

Title:
  TFTP boot: error: time out opening '/grub/i386-pc/normal.mod'

Status in grub2 package in Ubuntu:
  New

Bug description:
  My DHCP server sends the PXE commands, grub gets load from the TFTP
  server, but it is unable to load the grub.cfg file since it is trying
  to TFTP to my firewall instead of the TFTP server.

  1. DHCP and PXE server are NOT on the same subnet 
  2. Grub time out when it TFTP cause it is trying to TFTP to an invalid server (It tries to TFTP to the firewalll) 

  
  the website below have a fix for the problem but it is not implemented in the latest Ubuntu grub release
  https://savannah.gnu.org/bugs/?43396

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