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[bug #38111] EFI TFTP packet corruption

From: Thomas Jourdan
Subject: [bug #38111] EFI TFTP packet corruption
Date: Thu, 07 Mar 2013 13:54:41 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.4 (KHTML, like Gecko) Chrome/22.0.1229.94 Safari/537.4

Follow-up Comment #1, bug #38111 (project grub):


I confirm the issue. On a custom UEFI firmware based on UDK2010.SR1 (or EDKII
head), UEFI PXE boot fails with grub2 (release and latest version).

If I enable only the IPv4 stack in the firmware and the old PXE BC driver, it
works most of the time. I sometime have "Not an IP" or "couldn't send packet"
when I download a linux kernel...

If I enable both IPv4 and IPv6, and the new PXE BC code, it doesn't work. As
Lingzhu Xiang explained, the IPv6 stack sends icmpv6 messages which gets into
a race condition. This can easily be observed with wireshark. An incoming
icmpv6 message during a file transfer will stall it.

For your information, the problem doesn't occur with Elilo. Elilo  uses MTFP
protocol and it always works.



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