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

[Nathan March <nathan@xxxxxxxxxxxxxxxxxxxx>]

 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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> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
>
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