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

[George Shuklin <george.shuklin@xxxxxxxxx>]

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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