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