You might want to try setting the dummy interface up in libvirt. That may workaround it for now at the expense of polluting the ifconfig listings.
** Patch added: "Start dummy bridge interface 'up' rather than 'down'" https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/862136/+attachment/2480654/+files/Bring-up-dummy-interface.patch ** Tags added: apport-collected running-unity ** Description changed: When defining a network with an IPv6 address, libvirt fails to allocate the address properly and the launch of the supporting dnsmasq processes fails. ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: libvirt-bin 0.9.2-4ubuntu14 ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4 Uname: Linux 3.0.0-12-generic x86_64 ApportVersion: 1.23-0ubuntu2 Architecture: amd64 Date: Thu Sep 29 09:18:26 2011 InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110921.2) ProcEnviron: LANGUAGE=en_GB:en LANG=en_GB.UTF-8 SHELL=/bin/bash SourcePackage: libvirt UpgradeStatus: No upgrade log present (probably fresh install) modified.conffile..etc.libvirt.qemu.networks.default.xml: [deleted] + --- + AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. + ApportVersion: 1.23-0ubuntu2 + Architecture: amd64 + AudioDevicesInUse: + USER PID ACCESS COMMAND + /dev/snd/controlC0: neil 2331 F.... pulseaudio + CRDA: Error: [Errno 2] No such file or directory + Card0.Amixer.info: + Card hw:0 'SB'/'HDA ATI SB at 0xf0000000 irq 16' + Mixer name : 'Realtek ALC888' + Components : 'HDA:10ec0888,10250206,00100202 HDA:14f12c06,10250093,00100000' + Controls : 29 + Simple ctrls : 17 + Card1.Amixer.info: + Card hw:1 'HDMI'/'HDA ATI HDMI at 0xcfdec000 irq 19' + Mixer name : 'ATI RS690/780 HDMI' + Components : 'HDA:1002791a,00791a00,00100000' + Controls : 4 + Simple ctrls : 1 + Card1.Amixer.values: + Simple mixer control 'IEC958',0 + Capabilities: pswitch pswitch-joined penum + Playback channels: Mono + Mono: Playback [on] + DistroRelease: Ubuntu 11.10 + HibernationDevice: RESUME=UUID=3eb700a5-a61d-459b-b56c-f9c2ae7687db + InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110921.2) + Lsusb: + Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub + Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub + Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub + Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub + Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub + MachineType: Acer Aspire 5536 + Package: linux (not installed) + ProcEnviron: + LANGUAGE=en_GB:en + LANG=en_GB.UTF-8 + SHELL=/bin/bash + ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=7320df77-82a4-40ca-8b60-71339a4c595b ro quiet splash vt.handoff=7 + ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4 + RelatedPackageVersions: + linux-restricted-modules-3.0.0-12-generic N/A + linux-backports-modules-3.0.0-12-generic N/A + linux-firmware 1.60 + Tags: oneiric running-unity + Uname: Linux 3.0.0-12-generic x86_64 + UpgradeStatus: No upgrade log present (probably fresh install) + UserGroups: adm admin cdrom dialout libvirtd lpadmin plugdev sambashare + dmi.bios.date: 02/27/2009 + dmi.bios.vendor: Phoenix Technologies LTD + dmi.bios.version: V1.03 + dmi.board.name: JV50PU + dmi.board.vendor: Acer + dmi.board.version: Rev + dmi.chassis.type: 10 + dmi.chassis.vendor: Acer + dmi.chassis.version: N/A + dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrV1.03:bd02/27/2009:svnAcer:pnAspire5536:pvr0100:rvnAcer:rnJV50PU:rvrRev:cvnAcer:ct10:cvrN/A: + dmi.product.name: Aspire 5536 + dmi.product.version: 0100 + dmi.sys.vendor: Acer -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to libvirt in Ubuntu. https://bugs.launchpad.net/bugs/862136 Title: Can't define network with IPv6 address in libvirt - fails to define address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/862136/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs