Re: [Xen-users] Arp not sent after live migrations on xen-unstable

[Nathan March <nathan@xxxxxxxxxxxxxxxxxxxx>]

 Fwiw, this problem was due to me manually creating the bridge instead 
of letting xen do it, like the libvirt docs recommend. I've dropped the 
manual bridge and gone back to the xen scripts and things work fine now.
- Nathan

On 8/20/2010 10:31 AM, Nathan March wrote:
>  Thanks for the info George, I'm going to assume it's something I've 
> done and start from scratch.
> - Nathan
>
> On 8/20/2010 4:45 AM, George Shuklin wrote:
> > Good day.
> >
> > I found that newer version of kernel (2.6.34-xen) from gentoo (wich one
> > is stealed somewere (suse? not sure)) adopted to debian works fine.
> >
> > At least within my tests (4 cycles of migration between every of 6
> > testings servers) I was unable to reproduce bugs.
> >
> > I'll continue to tests, if I was wrong and bug still exists, I'll mail
> > about this.
> >
> > PS Migration tested on XCP 0.5 by xe vm-migrate command.
> >
> > Ð ÐÑÐ, 19/08/2010 Ð 10:11 -0700, Nathan March ÐÐÑÐÑ:
> > > The consensus from the mailing list posts I found a while ago seemed
> > > to imply that it had been fixed so I'm not clear if this is an
> > > outstanding bug, a regression or just something that I'm doing wrong
> > > that has broken it.
> > >
> > > Are there any steps I can take to debug this further and try and get
> > > some more info? Cranking up the debug level on xend didn't seem to
> > > result in anything useful.
> > >
> > > - Nathan
> > >
> > > On 8/18/2010 5:53 PM, George Shuklin wrote:
> > > > I'm pretty concerned about this problem.
> > > >
> > > > Right now: I suppose, it was fixed somewhere in new netfront driver.
> > > > (not checked).
> > > >
> > > > If no, I have few ideas about workaround. Main is an event via 
> > > > xen-evtch
> > > > about suspending. Small module/appilcation in guest can sent a fake 
> > > > ARP
> > > > every time it got suspend event. Other is using xenstore to send 
> > > > command
> > > > to program from host. (both are ugly hacks).
> > > >
> > > > Best way is still fake ARP from netback or netfront...
> > > >
> > > > Ð ÐÑÐ, 18/08/2010 Ð 14:22 -0700, Nathan March ÐÐÑÐÑ:
> > > > > Hi All,
> > > > >
> > > > > Having an issue with xen-4.0-unstable where after completing a live
> > > > > migration, an arp is never sent out to update the switch with the new
> > > > > location of the mac address.
> > > > >
> > > > > Network is configured as per libvirt's instructions with the xen
> > > > > network-script disabled and the bridge (xenbr0) always up.
> > > > > http://wiki.libvirt.org/page/Networking#Bridged_networking_.28aka_.22shared_physical_device.22.29 
> > > > >
> > > > > Things work fine 10s after doing the migration once the switch has
> > > > > picked up the move, checking the mac address tables confirms it's 
> > > > > still
> > > > > going to the old host. I've also confirmed that it's not going out at
> > > > > all via a span port on the switch.
> > > > >
> > > > > Saw a bunch of postings a while ago regarding it, but nothing recent.
> > > > > Anyone have any insight on what might be wrong?
> > > > >
> > > > > - Nathan
> > > > >
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