[Bug 584048] Re: kvm images losing connectivity w/bridged network

[Derek Simkowiak]

I have the same 4-second bridge freeze when using LXC containers and
lxc-start or lxc-stop.  (I am using a custom script to create my LXC
containers.)  I saw the reference to this above:

https://www.redhat.com/archives/libvir-list/2010-July/msg00450.html

I changed my custom script from this:

MACADDR="00:16:3e:"`head /dev/urandom | md5sum | sed -r
's/^(.{6}).*$/\1/; s/([0-9a-f]{2})/\1:/g; s/:$//;'`

...to this:

MACADDR="fe:16:3e:"`head /dev/urandom | md5sum | sed -r
's/^(.{6}).*$/\1/; s/([0-9a-f]{2})/\1:/g; s/:$//;'`

...and now the freezing is gone.

Since this is my own custom script, I'm not sure what package it would
belong to.  Just be aware that this is a fundamental "bridge" issue and
not limited to libvirt, KVM.  It shows up with LXC and probably any
other system where you add a new MAC.

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https://bugs.launchpad.net/bugs/584048

Title:
  kvm images losing connectivity w/bridged network