[Qemu-devel] slirp + ipxe + ipv6 dns issue

[Cole Robinson <crobinso@redhat.com>]

Hi Samuel,

A Fedora user reported a regression for his ipxe setup (Jan, CCd). He has a
public PXE server and config. You can see details about his config here:
http://boot.salstar.sk/ipxe/

Reproducer:

  wget http://boot.salstar.sk/ipxe/ipxe.lkrn
  qemu-system-x86_64 -kernel ipxe.lkrn

Non-working output looks like:

Configuring (net0 52:54:00:12:34:56)..... ok
Could not get time and date: Connection timed out (http://ipxe.org/4c116035)
https://boot.salstar.sk/by_mac/52%3A54%3A00%3A12%3A34%3A56..................
Connection timed out (http://ipxe.org/4c116035)
https://boot.salstar.sk/by_ip/10.0.2.15.................. Connection timed out
(http://ipxe.org/4c116035)
https://boot.salstar.sk/menu.ipxe.................. Connection timed out
(http://ipxe.org/4c116035)
Press any key to enter failsafe menu ...


Working output will quickly drop into a text UI boot menu.


I bisected to this commit:

commit f7725df38750c1eaebc6665159bb58ec23864c92
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Sun Mar 20 16:02:52 2016 +0100

    slirp: Add RDNSS advertisement


And infact just reverting it on top of qemu.git makes things work again.

I'm not really sure if this is a bug or if it's just exposing a config issue
on the ipxe server... I tried enabling some ipxe debug commands like
ping/nslookup but didn't really get anywhere. Any thoughts/ideas?

Thanks,
Cole