[Kernel-packages] [Bug 1218959] Re: KVM virbr# no longer forwards multicast traffic by default (U12.04)

2014-05-07 Thread Michael Cook
Thanks for the patch and test instructions.

Should this be tested using U12.04.2 LTS or U12.04.4 LTS as a baseline
and should I apply updates to the installation first?

A few questions:
1)  I don't understand how of the security update superceeding this patch 
affects this problem unless it prevents enabling MC on bridge?  
2) There is reference to an independent kernel update to libvirt has addressed 
this problem and if so, in which kernel.  The comment #3 mentioned a redhat bug 
but the comments of that bug say it's not going to be propagated and looks 
project specific.  Maybe I misread it?
3) I originally applied a udev rule myself, but specific to the single bridged 
interface I'm using to send multicast over.  Your proposed udev patch applies 
this to all virbr* interfaces.  Is this ok/sensible?

Personally, I think for U12.04.2LTS back ports, MC traffic should have
simply been left as-is.  Future releases should have adopted proper
handling of MC traffic and required Querier to be enabled.

Appreciate any insight, thanks.

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Title:
  KVM virbr# no longer forwards multicast traffic by default (U12.04)

Status in “libvirt” package in Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Released
Status in “libvirt” source package in Precise:
  Fix Committed
Status in “linux” source package in Precise:
  Won't Fix

Bug description:
  A recent kernel update (Apr 2013) has made it's way to U12.04.2 LTS
  (approx June-Aug 2013) and has stopped the (default) behaviour of
  automatically forwarding multicast traffic over virbr#.  Some updates
  the bridge subsystem now, by default, disable multicast traffic
  without IGMP Querier being enabled on that bridge.

  The corresponding Fedora/RHEL bug tracks the progress/updates of this 
specific change in relation to Fedora.  
  https://bugzilla.redhat.com/show_bug.cgi?id=880035

  (I have yet to find a similar bug report in Ubuntu so I have created
  this bug to help the Ubuntu community identify multicast issues that
  may arise since April 2013 in U12.04 LTS and presumably other Ubuntu
  releases as backports are made and break regression testing.)

  Using the latest patches in U12.04.2 LTS this following addition, with some 
modifications, can be made to the udev rules will enable multicast on virbr# 
bridge:
  https://bugzilla.redhat.com/show_bug.cgi?id=880035#c38

  While this is an improvement/correction to KVM bridge networking it
  has broken existing functionality in U12.04.2 LTS and broke regressed
  functionality that once worked.

  IMPACT: multicast is broken over libvirt bridges
  FIX: set a (new, introduced by a new kernel) toggle on the bridges
  TEST CASE: cat /sys/devices/virtual/net/virbr0/bridge/multicast_querier - if 
0, then forwarding multicast will be broken.
  REGRESSION POTENTIAL: should be none. older kernels do not have the toggle, 
and failure to set it will be ignored

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[Kernel-packages] [Bug 1218959] Re: KVM virbr# no longer forwards multicast traffic by default (U12.04)

2014-05-07 Thread Launchpad Bug Tracker
This bug was fixed in the package libvirt - 0.9.8-2ubuntu17.19

---
libvirt (0.9.8-2ubuntu17.19) precise-proposed; urgency=medium

  * Add a udev hook and script to enable multicast_querier when a
virbr* is brought up (LP: #1218959)
 -- Serge Hallyn serge.hal...@ubuntu.com   Wed, 26 Mar 2014 11:36:55 -0500

** Changed in: libvirt (Ubuntu Precise)
   Status: Fix Committed = Fix Released

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Title:
  KVM virbr# no longer forwards multicast traffic by default (U12.04)

Status in “libvirt” package in Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Released
Status in “libvirt” source package in Precise:
  Fix Released
Status in “linux” source package in Precise:
  Won't Fix

Bug description:
  A recent kernel update (Apr 2013) has made it's way to U12.04.2 LTS
  (approx June-Aug 2013) and has stopped the (default) behaviour of
  automatically forwarding multicast traffic over virbr#.  Some updates
  the bridge subsystem now, by default, disable multicast traffic
  without IGMP Querier being enabled on that bridge.

  The corresponding Fedora/RHEL bug tracks the progress/updates of this 
specific change in relation to Fedora.  
  https://bugzilla.redhat.com/show_bug.cgi?id=880035

  (I have yet to find a similar bug report in Ubuntu so I have created
  this bug to help the Ubuntu community identify multicast issues that
  may arise since April 2013 in U12.04 LTS and presumably other Ubuntu
  releases as backports are made and break regression testing.)

  Using the latest patches in U12.04.2 LTS this following addition, with some 
modifications, can be made to the udev rules will enable multicast on virbr# 
bridge:
  https://bugzilla.redhat.com/show_bug.cgi?id=880035#c38

  While this is an improvement/correction to KVM bridge networking it
  has broken existing functionality in U12.04.2 LTS and broke regressed
  functionality that once worked.

  IMPACT: multicast is broken over libvirt bridges
  FIX: set a (new, introduced by a new kernel) toggle on the bridges
  TEST CASE: cat /sys/devices/virtual/net/virbr0/bridge/multicast_querier - if 
0, then forwarding multicast will be broken.
  REGRESSION POTENTIAL: should be none. older kernels do not have the toggle, 
and failure to set it will be ignored

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Re: [Kernel-packages] [Bug 1218959] Re: KVM virbr# no longer forwards multicast traffic by default (U12.04)

2014-05-06 Thread Serge Hallyn
There has also been some concern about the propriety of the
proposed fix (when a newer kernel with the upstream fixes should
appear), in addition to lack of verifiaction - so please go ahead
and supersede this if you haven't already.

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Title:
  KVM virbr# no longer forwards multicast traffic by default (U12.04)

Status in “libvirt” package in Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Released
Status in “libvirt” source package in Precise:
  Fix Committed
Status in “linux” source package in Precise:
  Won't Fix

Bug description:
  A recent kernel update (Apr 2013) has made it's way to U12.04.2 LTS
  (approx June-Aug 2013) and has stopped the (default) behaviour of
  automatically forwarding multicast traffic over virbr#.  Some updates
  the bridge subsystem now, by default, disable multicast traffic
  without IGMP Querier being enabled on that bridge.

  The corresponding Fedora/RHEL bug tracks the progress/updates of this 
specific change in relation to Fedora.  
  https://bugzilla.redhat.com/show_bug.cgi?id=880035

  (I have yet to find a similar bug report in Ubuntu so I have created
  this bug to help the Ubuntu community identify multicast issues that
  may arise since April 2013 in U12.04 LTS and presumably other Ubuntu
  releases as backports are made and break regression testing.)

  Using the latest patches in U12.04.2 LTS this following addition, with some 
modifications, can be made to the udev rules will enable multicast on virbr# 
bridge:
  https://bugzilla.redhat.com/show_bug.cgi?id=880035#c38

  While this is an improvement/correction to KVM bridge networking it
  has broken existing functionality in U12.04.2 LTS and broke regressed
  functionality that once worked.

  IMPACT: multicast is broken over libvirt bridges
  FIX: set a (new, introduced by a new kernel) toggle on the bridges
  TEST CASE: cat /sys/devices/virtual/net/virbr0/bridge/multicast_querier - if 
0, then forwarding multicast will be broken.
  REGRESSION POTENTIAL: should be none. older kernels do not have the toggle, 
and failure to set it will be ignored

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[Kernel-packages] [Bug 1218959] Re: KVM virbr# no longer forwards multicast traffic by default (U12.04)

2014-05-05 Thread Marc Deslauriers
Can someone please test this package so it gets released?

If nobody tests it, it will get superseded by a security update.

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Title:
  KVM virbr# no longer forwards multicast traffic by default (U12.04)

Status in “libvirt” package in Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Released
Status in “libvirt” source package in Precise:
  Fix Committed
Status in “linux” source package in Precise:
  Won't Fix

Bug description:
  A recent kernel update (Apr 2013) has made it's way to U12.04.2 LTS
  (approx June-Aug 2013) and has stopped the (default) behaviour of
  automatically forwarding multicast traffic over virbr#.  Some updates
  the bridge subsystem now, by default, disable multicast traffic
  without IGMP Querier being enabled on that bridge.

  The corresponding Fedora/RHEL bug tracks the progress/updates of this 
specific change in relation to Fedora.  
  https://bugzilla.redhat.com/show_bug.cgi?id=880035

  (I have yet to find a similar bug report in Ubuntu so I have created
  this bug to help the Ubuntu community identify multicast issues that
  may arise since April 2013 in U12.04 LTS and presumably other Ubuntu
  releases as backports are made and break regression testing.)

  Using the latest patches in U12.04.2 LTS this following addition, with some 
modifications, can be made to the udev rules will enable multicast on virbr# 
bridge:
  https://bugzilla.redhat.com/show_bug.cgi?id=880035#c38

  While this is an improvement/correction to KVM bridge networking it
  has broken existing functionality in U12.04.2 LTS and broke regressed
  functionality that once worked.

  IMPACT: multicast is broken over libvirt bridges
  FIX: set a (new, introduced by a new kernel) toggle on the bridges
  TEST CASE: cat /sys/devices/virtual/net/virbr0/bridge/multicast_querier - if 
0, then forwarding multicast will be broken.
  REGRESSION POTENTIAL: should be none. older kernels do not have the toggle, 
and failure to set it will be ignored

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[Kernel-packages] [Bug 1218959] Re: KVM virbr# no longer forwards multicast traffic by default (U12.04)

2014-04-17 Thread Brian Murray
Hello Michael, or anyone else affected,

Accepted libvirt into precise-proposed. The package will build now and
be available at
http://launchpad.net/ubuntu/+source/libvirt/0.9.8-2ubuntu17.19 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: libvirt (Ubuntu Precise)
   Status: Confirmed = Fix Committed

** Tags added: verification-needed

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https://bugs.launchpad.net/bugs/1218959

Title:
  KVM virbr# no longer forwards multicast traffic by default (U12.04)

Status in “libvirt” package in Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Released
Status in “libvirt” source package in Precise:
  Fix Committed
Status in “linux” source package in Precise:
  Won't Fix

Bug description:
  A recent kernel update (Apr 2013) has made it's way to U12.04.2 LTS
  (approx June-Aug 2013) and has stopped the (default) behaviour of
  automatically forwarding multicast traffic over virbr#.  Some updates
  the bridge subsystem now, by default, disable multicast traffic
  without IGMP Querier being enabled on that bridge.

  The corresponding Fedora/RHEL bug tracks the progress/updates of this 
specific change in relation to Fedora.  
  https://bugzilla.redhat.com/show_bug.cgi?id=880035

  (I have yet to find a similar bug report in Ubuntu so I have created
  this bug to help the Ubuntu community identify multicast issues that
  may arise since April 2013 in U12.04 LTS and presumably other Ubuntu
  releases as backports are made and break regression testing.)

  Using the latest patches in U12.04.2 LTS this following addition, with some 
modifications, can be made to the udev rules will enable multicast on virbr# 
bridge:
  https://bugzilla.redhat.com/show_bug.cgi?id=880035#c38

  While this is an improvement/correction to KVM bridge networking it
  has broken existing functionality in U12.04.2 LTS and broke regressed
  functionality that once worked.

  IMPACT: multicast is broken over libvirt bridges
  FIX: set a (new, introduced by a new kernel) toggle on the bridges
  TEST CASE: cat /sys/devices/virtual/net/virbr0/bridge/multicast_querier - if 
0, then forwarding multicast will be broken.
  REGRESSION POTENTIAL: should be none. older kernels do not have the toggle, 
and failure to set it will be ignored

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1218959] Re: KVM virbr# no longer forwards multicast traffic by default (U12.04)

2014-04-15 Thread Joseph Salisbury
** Changed in: linux (Ubuntu)
   Importance: Undecided = High

** Changed in: linux (Ubuntu Precise)
   Importance: Undecided = High

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Title:
  KVM virbr# no longer forwards multicast traffic by default (U12.04)

Status in “libvirt” package in Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Released
Status in “libvirt” source package in Precise:
  Confirmed
Status in “linux” source package in Precise:
  Won't Fix

Bug description:
  A recent kernel update (Apr 2013) has made it's way to U12.04.2 LTS
  (approx June-Aug 2013) and has stopped the (default) behaviour of
  automatically forwarding multicast traffic over virbr#.  Some updates
  the bridge subsystem now, by default, disable multicast traffic
  without IGMP Querier being enabled on that bridge.

  The corresponding Fedora/RHEL bug tracks the progress/updates of this 
specific change in relation to Fedora.  
  https://bugzilla.redhat.com/show_bug.cgi?id=880035

  (I have yet to find a similar bug report in Ubuntu so I have created
  this bug to help the Ubuntu community identify multicast issues that
  may arise since April 2013 in U12.04 LTS and presumably other Ubuntu
  releases as backports are made and break regression testing.)

  Using the latest patches in U12.04.2 LTS this following addition, with some 
modifications, can be made to the udev rules will enable multicast on virbr# 
bridge:
  https://bugzilla.redhat.com/show_bug.cgi?id=880035#c38

  While this is an improvement/correction to KVM bridge networking it
  has broken existing functionality in U12.04.2 LTS and broke regressed
  functionality that once worked.

  IMPACT: multicast is broken over libvirt bridges
  FIX: set a (new, introduced by a new kernel) toggle on the bridges
  TEST CASE: cat /sys/devices/virtual/net/virbr0/bridge/multicast_querier - if 
0, then forwarding multicast will be broken.
  REGRESSION POTENTIAL: should be none. older kernels do not have the toggle, 
and failure to set it will be ignored

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[Kernel-packages] [Bug 1218959] Re: KVM virbr# no longer forwards multicast traffic by default (U12.04)

2014-04-14 Thread Stefan Bader
Serge, looks like we need to be careful with those two. At least one of them:
  bridge: only expire the mdb entry when query is received
was reverted with 3.12. The commit message looks a bit like they might have 
packed several reverts into one. And it references
bridge: disable snooping if there is no querier as the one making the 
reverted stuff obsolete.

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Title:
  KVM virbr# no longer forwards multicast traffic by default (U12.04)

Status in “libvirt” package in Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
  Incomplete
Status in “libvirt” source package in Precise:
  Confirmed
Status in “linux” source package in Precise:
  Incomplete

Bug description:
  A recent kernel update (Apr 2013) has made it's way to U12.04.2 LTS
  (approx June-Aug 2013) and has stopped the (default) behaviour of
  automatically forwarding multicast traffic over virbr#.  Some updates
  the bridge subsystem now, by default, disable multicast traffic
  without IGMP Querier being enabled on that bridge.

  The corresponding Fedora/RHEL bug tracks the progress/updates of this 
specific change in relation to Fedora.  
  https://bugzilla.redhat.com/show_bug.cgi?id=880035

  (I have yet to find a similar bug report in Ubuntu so I have created
  this bug to help the Ubuntu community identify multicast issues that
  may arise since April 2013 in U12.04 LTS and presumably other Ubuntu
  releases as backports are made and break regression testing.)

  Using the latest patches in U12.04.2 LTS this following addition, with some 
modifications, can be made to the udev rules will enable multicast on virbr# 
bridge:
  https://bugzilla.redhat.com/show_bug.cgi?id=880035#c38

  While this is an improvement/correction to KVM bridge networking it
  has broken existing functionality in U12.04.2 LTS and broke regressed
  functionality that once worked.

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1218959] Re: KVM virbr# no longer forwards multicast traffic by default (U12.04)

2014-04-14 Thread Serge Hallyn
** Description changed:

  A recent kernel update (Apr 2013) has made it's way to U12.04.2 LTS
  (approx June-Aug 2013) and has stopped the (default) behaviour of
  automatically forwarding multicast traffic over virbr#.  Some updates
  the bridge subsystem now, by default, disable multicast traffic without
  IGMP Querier being enabled on that bridge.
  
  The corresponding Fedora/RHEL bug tracks the progress/updates of this 
specific change in relation to Fedora.  
  https://bugzilla.redhat.com/show_bug.cgi?id=880035
  
  (I have yet to find a similar bug report in Ubuntu so I have created
  this bug to help the Ubuntu community identify multicast issues that may
  arise since April 2013 in U12.04 LTS and presumably other Ubuntu
  releases as backports are made and break regression testing.)
  
  Using the latest patches in U12.04.2 LTS this following addition, with some 
modifications, can be made to the udev rules will enable multicast on virbr# 
bridge:
  https://bugzilla.redhat.com/show_bug.cgi?id=880035#c38
  
  While this is an improvement/correction to KVM bridge networking it has
  broken existing functionality in U12.04.2 LTS and broke regressed
  functionality that once worked.
+ 
+ IMPACT: multicast is broken over libvirt bridges
+ FIX: set a (new, introduced by a new kernel) toggle on the bridges
+ TEST CASE: cat /sys/devices/virtual/net/virbr0/bridge/multicast_querier - if 
0, then forwarding multicast will be broken.
+ REGRESSION POTENTIAL: should be none. older kernels do not have the toggle, 
and failure to set it will be ignored

** Changed in: linux (Ubuntu)
   Status: Incomplete = Fix Released

** Changed in: linux (Ubuntu Precise)
   Status: Incomplete = Won't Fix

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Title:
  KVM virbr# no longer forwards multicast traffic by default (U12.04)

Status in “libvirt” package in Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Released
Status in “libvirt” source package in Precise:
  Confirmed
Status in “linux” source package in Precise:
  Won't Fix

Bug description:
  A recent kernel update (Apr 2013) has made it's way to U12.04.2 LTS
  (approx June-Aug 2013) and has stopped the (default) behaviour of
  automatically forwarding multicast traffic over virbr#.  Some updates
  the bridge subsystem now, by default, disable multicast traffic
  without IGMP Querier being enabled on that bridge.

  The corresponding Fedora/RHEL bug tracks the progress/updates of this 
specific change in relation to Fedora.  
  https://bugzilla.redhat.com/show_bug.cgi?id=880035

  (I have yet to find a similar bug report in Ubuntu so I have created
  this bug to help the Ubuntu community identify multicast issues that
  may arise since April 2013 in U12.04 LTS and presumably other Ubuntu
  releases as backports are made and break regression testing.)

  Using the latest patches in U12.04.2 LTS this following addition, with some 
modifications, can be made to the udev rules will enable multicast on virbr# 
bridge:
  https://bugzilla.redhat.com/show_bug.cgi?id=880035#c38

  While this is an improvement/correction to KVM bridge networking it
  has broken existing functionality in U12.04.2 LTS and broke regressed
  functionality that once worked.

  IMPACT: multicast is broken over libvirt bridges
  FIX: set a (new, introduced by a new kernel) toggle on the bridges
  TEST CASE: cat /sys/devices/virtual/net/virbr0/bridge/multicast_querier - if 
0, then forwarding multicast will be broken.
  REGRESSION POTENTIAL: should be none. older kernels do not have the toggle, 
and failure to set it will be ignored

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[Kernel-packages] [Bug 1218959] Re: KVM virbr# no longer forwards multicast traffic by default (U12.04)

2014-04-11 Thread Serge Hallyn
** Also affects: linux (Ubuntu)
   Importance: Undecided
   Status: New

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Title:
  KVM virbr# no longer forwards multicast traffic by default (U12.04)

Status in “libvirt” package in Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
  New
Status in “libvirt” source package in Precise:
  Confirmed
Status in “linux” source package in Precise:
  New

Bug description:
  A recent kernel update (Apr 2013) has made it's way to U12.04.2 LTS
  (approx June-Aug 2013) and has stopped the (default) behaviour of
  automatically forwarding multicast traffic over virbr#.  Some updates
  the bridge subsystem now, by default, disable multicast traffic
  without IGMP Querier being enabled on that bridge.

  The corresponding Fedora/RHEL bug tracks the progress/updates of this 
specific change in relation to Fedora.  
  https://bugzilla.redhat.com/show_bug.cgi?id=880035

  (I have yet to find a similar bug report in Ubuntu so I have created
  this bug to help the Ubuntu community identify multicast issues that
  may arise since April 2013 in U12.04 LTS and presumably other Ubuntu
  releases as backports are made and break regression testing.)

  Using the latest patches in U12.04.2 LTS this following addition, with some 
modifications, can be made to the udev rules will enable multicast on virbr# 
bridge:
  https://bugzilla.redhat.com/show_bug.cgi?id=880035#c38

  While this is an improvement/correction to KVM bridge networking it
  has broken existing functionality in U12.04.2 LTS and broke regressed
  functionality that once worked.

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1218959] Re: KVM virbr# no longer forwards multicast traffic by default (U12.04)

2014-04-11 Thread Serge Hallyn
I had thought that we'd need a udev rule to work around this, but
looking over the fedora bug in more detail it looks like cherrypicking
the two patches mentioned in comment 31 (
https://bugzilla.redhat.com/show_bug.cgi?id=880035#c31 ) should do it.

Can those who are suffering from this bug please tell us precisely which
kernel they are using?  If I understand right, this should be fixed in
3.11, so I would expect anyone using the saucy backport kernel to not be
affected.

** Bug watch added: Red Hat Bugzilla #880035
   https://bugzilla.redhat.com/show_bug.cgi?id=880035

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Title:
  KVM virbr# no longer forwards multicast traffic by default (U12.04)

Status in “libvirt” package in Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
  Incomplete
Status in “libvirt” source package in Precise:
  Confirmed
Status in “linux” source package in Precise:
  Incomplete

Bug description:
  A recent kernel update (Apr 2013) has made it's way to U12.04.2 LTS
  (approx June-Aug 2013) and has stopped the (default) behaviour of
  automatically forwarding multicast traffic over virbr#.  Some updates
  the bridge subsystem now, by default, disable multicast traffic
  without IGMP Querier being enabled on that bridge.

  The corresponding Fedora/RHEL bug tracks the progress/updates of this 
specific change in relation to Fedora.  
  https://bugzilla.redhat.com/show_bug.cgi?id=880035

  (I have yet to find a similar bug report in Ubuntu so I have created
  this bug to help the Ubuntu community identify multicast issues that
  may arise since April 2013 in U12.04 LTS and presumably other Ubuntu
  releases as backports are made and break regression testing.)

  Using the latest patches in U12.04.2 LTS this following addition, with some 
modifications, can be made to the udev rules will enable multicast on virbr# 
bridge:
  https://bugzilla.redhat.com/show_bug.cgi?id=880035#c38

  While this is an improvement/correction to KVM bridge networking it
  has broken existing functionality in U12.04.2 LTS and broke regressed
  functionality that once worked.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1218959/+subscriptions

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[Kernel-packages] [Bug 1218959] Re: KVM virbr# no longer forwards multicast traffic by default (U12.04)

2014-04-11 Thread Ubuntu Foundations Team Bug Bot
** Tags added: patch

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https://bugs.launchpad.net/bugs/1218959

Title:
  KVM virbr# no longer forwards multicast traffic by default (U12.04)

Status in “libvirt” package in Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
  Incomplete
Status in “libvirt” source package in Precise:
  Confirmed
Status in “linux” source package in Precise:
  Incomplete

Bug description:
  A recent kernel update (Apr 2013) has made it's way to U12.04.2 LTS
  (approx June-Aug 2013) and has stopped the (default) behaviour of
  automatically forwarding multicast traffic over virbr#.  Some updates
  the bridge subsystem now, by default, disable multicast traffic
  without IGMP Querier being enabled on that bridge.

  The corresponding Fedora/RHEL bug tracks the progress/updates of this 
specific change in relation to Fedora.  
  https://bugzilla.redhat.com/show_bug.cgi?id=880035

  (I have yet to find a similar bug report in Ubuntu so I have created
  this bug to help the Ubuntu community identify multicast issues that
  may arise since April 2013 in U12.04 LTS and presumably other Ubuntu
  releases as backports are made and break regression testing.)

  Using the latest patches in U12.04.2 LTS this following addition, with some 
modifications, can be made to the udev rules will enable multicast on virbr# 
bridge:
  https://bugzilla.redhat.com/show_bug.cgi?id=880035#c38

  While this is an improvement/correction to KVM bridge networking it
  has broken existing functionality in U12.04.2 LTS and broke regressed
  functionality that once worked.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1218959/+subscriptions

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Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp