Bug 1038965

+++ This bug was initially created as a clone of Bug #1038963 +++

+++ This bug was initially created as a clone of Bug #1014422 +++

Description of problem:

qemu doesn't listen on IPv6 socket for IPv4 and IPv6 VNC connections.

Version-Release number of selected component (if applicable):
qemu-1.4.2-10.fc19.x86_64

How reproducible:
always

Steps to Reproduce:
1. Use virt-manager to create and start a guest with VNC display
2. Check the listening VNC socket: sudo netstat -nlp | grep :59

Actual results:

>sudo netstat -nlp | grep :59
tcp        0      0 127.0.0.1:5900          0.0.0.0:*               LISTEN      3233/qemu-system-x8 

Expected results:

qemu should listen on an IPv6 socket configured to accept both IPv4 and IPv6 connections.

>sudo netstat -nlp | grep :59
tcp6        0      0 ::1:5900          :::*               LISTEN      3233/qemu-system-x8 

Additional info:

--- Additional comment from Cole Robinson on 2013-10-31 22:06:30 CET ---

Dan, thoughts on if this is intentional or a defect, and if so is it qemu or libvirt?

--- Additional comment from Daniel Berrange on 2013-11-01 09:56:23 CET ---

It is a bug - we should listen on ::1 by default, with v6-only=0 so that it also covers 127.0.0.1. At minimum it is a libvirt bug.

--- Additional comment from Jan Tomko on 2013-11-01 17:21:42 CET ---

::1 with IPV6_V6ONLY=0 does not cover 127.0.0.1, that only works for ::

Since QEMU only supports one listen address, we can't tell it to listen on both.

Even if we specify a hostname ('localhost') QEMU will only listen on the first address that works (usually ::1 on dual-stack systems) instead of listening on all of them.