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My friend has found a way to enable ping itself, when this problem
happened. But not found why this happen.
sudo echo "1" >
/sys/class/net/br1000/brif/<virtual-interface-name>/hairpin_mode

I file a ticket to report this problem:
https://bugs.launchpad.net/nova/+bug/1040255

hopefully someone can find why this happen and solve it.

Thanks,
Sam


On Fri, Jul 20, 2012 at 3:50 PM, Gabriel Hurley
<Gabriel.Hurley at nebula.com>wrote:

>  I ran into some similar issues with the _*enable*_hairpin() call. The
> call is allowed to fail silently and (in my case) was failing. I couldn’t
> for the life of me figure out why, though, and since I’m really not a
> networking person I didn’t trace it along too far.****
>
> ** **
>
> Just thought I’d share my similar pain.****
>
> ** **
>
> **-          **Gabriel****
>
> ** **
>
> *From:* openstack-bounces+gabriel.hurley=nebula.com at lists.launchpad.net[mailto:
> openstack-bounces+gabriel.hurley=nebula.com at lists.launchpad.net] *On
> Behalf Of *Sam Su
> *Sent:* Thursday, July 19, 2012 11:50 AM
> *To:* Brian Haley
> *Cc:* openstack
> *Subject:* Re: [Openstack] VM can't ping self floating IP after a
> snapshot is taken****
>
> ** **
>
> Thank you for your support.****
>
> ** **
>
> I checked the file  nova/virt/libvirt/connection.py, the sentence
> self._enable_hairpin(instance) is already added to the
> function  _hard_reboot().****
>
> It looks like there are some difference between taking snapshot and reboot
> instance. I tried to figure out how to fix this bug but failed. ****
>
> ** **
>
> It will be much appreciated if anyone can give some hints.****
>
> ** **
>
> Thanks,****
>
> Sam****
>
> ** **
>
> On Thu, Jul 19, 2012 at 8:37 AM, Brian Haley <brian.haley at hp.com> wrote:**
> **
>
> On 07/17/2012 05:56 PM, Sam Su wrote:
> > Hi,
> >
> > Just This always happens in Essex release. After I take a snapshot of my
> VM ( I
> > tried Ubuntu 12.04 or CentOS 5.8), VM can't ping its self floating IP;
> before I
> > take a snapshot though, VM can ping its self floating IP.
> >
> > This looks closely related to
> https://bugs.launchpad.net/nova/+bug/933640, but
> > still a little different. In 933640, it sounds like VM can't ping its
> self
> > floating IP regardless whether we take a snapshot or not.
> >
> > Any suggestion to make an easy fix? And what is the root cause of the
> problem?****
>
> It might be because there's a missing _enable_hairpin() call in the
> reboot()
> function.  Try something like this...
>
> nova/virt/libvirt/connection.py, _hard_reboot():
>
>              self._create_new_domain(xml)
> +            self._enable_hairpin(instance)
>              self.firewall_driver.apply_instance_filter(instance,
> network_info)
>
> At least that's what I remember doing myself recently when testing after a
> reboot, don't know about snapshot.
>
> Folsom has changed enough that something different would need to be done
> there.
>
> -Brian****
>
> ** **
>
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